Departmental Representative to the Defense Nuclear Facilities Safety Board

Hanford

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This page last updated Wednesday, November 20, 2024

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• Sandia Field Office Contact for Board Issues
• EHSS-1.1 Site Contact
• Hanford Website
• Related Recommendations:  2012-2, 2011-1, 2010-2, 2010-1, 93-5, 92-4, 90-7, 90-3

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• November 15, 2024, Board letter concerning the DOE development of Oder 421.1, Nuclear Safety Basis and establishing a 60-day reporting requirement, and before the new order is issued, for a report and briefing regarding DOE's path forward for issuing DOE Order 421.1.
• October 7, 2024, Department letter transmitting the Implementation Plan for Recommendation 2023-1, Onsite Transportation Safety
• October 3, 2024, Board letter providing its review of the maintenance program at the WTP's Low Activity Waste Facility at the Hanford Site for DOE's information and use to further improve program practices.
• August 22, 2024, Department letter stating that DOE is taking a 45-Day extension to complete the Implementation Plan for Recommendation 2023-1, Onsite Transportation Safety.
• July 17, 2024, Board letter providing its report entitled, Plutonium Storage Container Fire Testing, which outlines technical issues with the development and conduct of the tests. The Board encourages DOE to consider the limitations indicated by these issues when its contractors use the test results in safety analyses or develop future test protocols in this area.
• June 21, 2024, Department letter documenting completion of Milestone 5.4.3 of the DOE Implementation Plan for Recommendation 2020-1, Nuclear Safety Requirements.
• June 3, 2024, Board letter providing its review of maintenance practices for aboveground and underground electrical cable systems in the DOE defense nuclear complex for DOE's information and use.
• April 26, 2024, Report to Congress: Fiscal Year 2023 Department of Energy Activities Relating to the Defense Nuclear Facilities Safety Board
• April 24, 2024, Department letter transmitting Milestone 5.1.4, "Implement Best Practices and Process Enhancements Based on Results of Benchmarking Review," of the Department's Implementation Plan for Recommendation 2020-1, Nuclear Safety Requirements.
• March 18, 2024, DNFSB 34th Annual Report to Congress for calendar year 2023
• January 30, 2024, Department letter transmitting the FY2023 Annual Nuclear Criticality Safety Metrics Report
• January 29, 2024, Department letter transmitting Deliverable 5.1.3 of the Implementation Plan for Recommendation 2020-1, Nuclear Safety Requirements

• October 11, 2023, Board letter providing its preliminary review of DOE's Benchmark Review Final Report for Aging Infrastructure Management.
• September 26, 2023, Department letter transmitting Deliverables 5.1.2, Perform Benchmark Review, of the Implementation Plan for Recommendation 2020-1, Nuclear Safety Requirements.
• July 13, 2023, Board letter regarding the DOE Safety Software Central Registry as a follow up to the Board's letter dated August 24, 2022, and DOE's status briefing to the Board on June 8, 2023.
• June 27, 2023, Board letter regarding the revised path forward for the design and installation of several engineered controls for Hanford's 242-A Evaporator, and establishing a semi-annual reporting requirement for DOE to provide briefings to the Board of the proposed path forward.
• April 28, 2023, Department letter responding to the Board letter of February 28, 2023, regarding the integration of the safety basis documents that implement the Direct-Feed Low Activity Waste (DFLAW) mission at Hanford.
• April 26, 2023, Department letter responding to the Board letter of August 17, 2022, and providing DOE/NNSA's evaluation of safety oversight processes at defense nuclear facilities.
• April 17, 2023, Department letter providing an update to the safety strategy for Hanford's 242-A Evaporator facility.
• February 28, 2023, Board letter providing the results of its review of the integration of the safety basis documents that implement the Direct-Feed Low Activity Waste (DFLAW) mission at Hanford and establishing a 60-day reporting requirement for a written response on DOE's plans to ensure effective implementation of the cover block removal SAC.
• January 31, 2023, Department letter providing the FY 2022 Annual Metrics Report on Nuclear Criticality Safety Programs.

• November 2, 2022, Department letter responding to the Board letter of June 16, 2022, on the implementation of the USQ process following a PSHA update as detailed in DNFSB TECH-47, Seismic Hazard Assessments.
• October 28, 2022, Department extension letter to provide the response to the Board's letter of August 17, 2022, regarding DOE oversight effectiveness by March 2023.
• October 20, 2022, Board letter informing DOE of the delayed responses on open DNFSB reporting requirements.
• October 6, 2022, Board letter providing its report on the Tank Side Cesium Removal (TSCR) system and ion-exchange column (IXC) connection issues at the Hanford site, and establishing a 90-day reporting requirement for DOE to provide a briefing on actions to ensure that the repaired connections will perform their safety functions.
• August 18, 2022, Board letter providing its assessment of the DOE Implementation Plan for Recommendation 2020-1, Nuclear Safety Requirements.
• August 17, 2022, Board letter providing the results of its review of DOE Oversight Effectiveness and establishing a 120-day reporting requirement for a report and briefing regarding DOE's plans to address the safety matters discussed in the Board staff report.
• July 19, 2022, Board letter providing its review of DOE's proposed changes in the safety strategy for the 242-A Evaporator Facility at the Hanford site and establishing a 90-day reporting requirement for a briefing that describes how the final revised safety strategy will meet DOE's safety requirements and address the Board's concern regarding safety significant scenarios.
• July 19, 2022, Board letter providing the results of its review of the preliminary documented safety analysis (PDSA) for the High-Level Waste (HLW) Facility at the Waste Treatment and Immobilization Plant (WTP) project at the Hanford Site.
• June 27, 2022, Department of Energy Implementation Plan (IP) for Recommendation 2020-1, Nuclear Safety Requirements
• June 16, 2022, Board letter establishing a 45-day reporting requirement for a written response on implementation of the unreviewed safety question (USQ) process following a probabilistic seismic hazard analysis (PSHA) update as detailed in the DNFSB Technical Report (TECH-47), Seismic Hazard Assessments.
• June 1, 2022, Supplementary Agreement for Memorandum of Understanding Between the U.S. Department of Energy and the Defense Nuclear Facilities Safety Board
• March 30, 2022, Department letter providing the FY 2021 Annual Nuclear Criticality Safety Program Metrics report.
• February 17, 2022, DOE-DNFSB Memorandum of Understanding
• January 6, 2022, Board letter revising the annual reporting requirement for DOE to annually provide a report and briefing for the Nuclear Criticality Safety Program.

• December 14, 2021, Department letter responding to the Board letter and Technical Report (DNFSB-TECH-47), Seismic Hazard Assessment, dated June 10, 2021.
• November 16, 2021, Board letter providing the results of its review of the safety basis for the Hanford Site's Central Waste Complex (CWC) for DOE's information and use as DOE revises the CWC safety basis.
• November 8, 2021, Board letter requesting DOE to provide an updated date for delivering DOE's response to the Board's June 10, 2021, letter and Technical Report-47, Seismic Hazard Assessments.
• November 2, 2021, Board letter providing the results of its review of the emergency management program at Hanford for DOE's use in executing continuous improvement efforts.
• September 15, 2021, Board letter providing the results of its review of the documented safety analysis (DSA) for Hanford’s Tank Farms facility and transmitting Technical Report (DNFSB/TECH-48).
• August 31, 2021, Department letter for a 45-day extension to provide the response to the Board’s letter dated June 10, 2021, and technical report DNFSB/TECH-47, Seismic Hazard Assessments.
• July 26, 2021, Board letter establishing a 60-day reporting requirement for DOE to brief the Board to address concerns and planned implementation of the revised DOE Standard 5506, Preparation of Safety Basis Documents for Transuranic (TRU) Waste Facilities.
• March 23, 2021, Board letter providing a courtesy copy of the DNFSB Annual Report to Congress for Calendar Year 2020.

• October 14, 2020, Board letter noting the resolution of issues related to erosion and corrosion wear allowances for the design of piping, process vessels, and pulse-jet mixers at the Hanford Site’s Waste Treatment and Immobilization Plant (WTP).
• July 15, 2020, Board letter closing Recommendation 2012-2, Hanford Tank Farms Flammable Gas Safety Strategy.
• June 25, 2020, Board letter providing its report on the hazard categorization of the Low-Activity Waste Facility at Hanford for DOE’s use and information.
• March 17, 2020, Board letter providing the Secretary a courtesy copy of its Annual Report to Congress for calendar year 2019.
• January 15, 2020, Department letter transmitting the FY2019 Annual Criticality Safety Metrics Report.

• December 4, 2019, Board letter documenting its concerns related to the design and qualification of emergency lighting systems to ensure their availability and function during or after a design basis earthquake. The Board is providing this information for DOE’s use.
• November 25, 2019, Department letter notifying the Board that DOE has completed Actions 2-3 and 2-4 of the Implementation Plan for Recommendation 2012-2, Hanford Tank Farms Flammable Gas Safety Strategy.
• November 18, 2019, Board Letter responding to DOE Office of River Protection (ORP) letter of May 15, 2019, regarding design issue resolution in Hanford’s Waste Treatment and Immobilization Plant pulse jet mixers control system.
• October 7, 2019, Board letter responding to DOE-ORP letter dated December 10, 2018, regarding the electrical distribution system at Hanford's Waste Treatment and Immobilization Plant.
• August 30, 2019, Department letter documenting resolution of concerns related to erosion wear allowances for piping, vessels, and pulse-jet mixers at the Waste Treatment and Immobilization Plant at the Hanford Site.
• July 30, 2019, Board letter closing Recommendation 2011-1, Safety Culture at the WTP, and providing its report, "Effectiveness of Actions to Improve WTP Safety Culture" for DOE’s consideration.
• July 29, 2019, Department letter communicating a 3-year delay for completing the implementation of Design/Operational Improvements 2 and 3 for the 242-A Evaporator facility at Hanford.
• July 2, 2019, Board letter transmitting the results of its review of the Hanford Site electrical infrastructure and systems for DOE’s use and information.
• May 21, 2019, FY2018 Annual Report to Congress on DOE's activities relating to the Defense Nuclear Facilities Safety Board.
• May 15, 2019, Department letter documenting resolution of DNFSB concerns related to control of pulse-jet mixers at the Waste Treatment and Immobilization Plant.
• May 9, 2019, Board letter responding to DOE’s letter dated October 24, 2018, regarding three open Board issues related to the High Level Waste (HLW) Facility at Hanford's Waste Treatment and Immobilization Plant, and providing the Staff Report on the HLW Facility technical issues for DOE’s information and use during the design process.
• April 1, 2019, DNFSB Twenty-Ninth Annual Report to Congress for Calendar Year 2018.
• January 25, 2019, Department letter transmitting the Fiscal Year 2018 Annual Criticality Safety Metrics Report.

• December 21, 2018, Department letter informing the Board of schedule delays to complete Actions 2-3 and 2-4 of the DOE Implementation Plan for Recommendation 2012-2, Hanford Tank Farms Flammable Gas Safety Strategy.
• December 10, 2018, Department letter informing the Board that DOE has completed all commitments to address the operability and safety of the overall electrical distribution system at the Waste Treatment and Immobilization Plant (WTP) at the Hanford Site.
• November 6, 2018, Department letter informing the Board that DOE has completed Action 3-1 (provide safety-significant annulus level detectors in each of the double-shell tank annuli where the flammable gas hazards exist) of the Implementation Plan for Recommendation 2012-2, Hanford Tank Farms Flammable Gas Safety Strategy.
• October 24, 2018, Department letter documenting resolution of safety issues regarding the safety design strategy for the Waste Treatment and Immobilization Plant (WTP) High-Level Waste Facility.
• September 7, 2018, Board letter providing its evaluation of DOE’s radiological practices and safety strategy for the remediation of the contaminated soil underneath the Hanford 300 Area, 324 Building B-Cell for DOE use and information.
• September 3, 2018, FY2017 Annual Report to Congress on DOE's activities relating to the Defense Nuclear Facilities Safety Board.
• July 23, 2018, Department letter informing the Board that DOE has completed Action 2-2 (installation of safety significant instrumentation for real-time monitoring of the ventilation exhaust flow from each double-shell tank where the flammable gas hazard exists) of the Implementation Plan for Recommendation 2012-2, Hanford Tank Farms Flammable Gas Safety Strategy.
• June 4, 2018, Board letter congratulating Ms. Anne Marie White on her confirmation as Assistant Secretary of Energy for Environmental Management and providing a brief summary of some of the Board’s current nuclear safety oversight activities at the Office of Environmental Management’s Defense Nuclear Facilities.
• March 23, 2018, DNFSB Twenty-Eighth Annual Report to Congress for Calendar Year 2017.
• January 29, 2018, Department letter transmitting the Resolution Record regarding the methodology for estimating dose consequences due to spray leaks from pressurized piping at the Waste Treatment and Immobilization Plant.
• January 24, 2018, Department letter transmitting the Fiscal Year 2017 Annual Metrics Report on the Nuclear Criticality Safety Criteria.

• December 11, 2017, Department letter informing the Board of the status of activities for Action 3-1 (Provide safety-significant annulus level detectors in each of the double-shell tank annuli where flammable gas exists) of the Implementation Plan for Recommendation 2012-2, Hanford Tank Farms Flammable Gas Safety Strategy.
• October 26, 2017, Board letter providing its annual status update on DOE’s progress regarding Recommendation 2012-2, Hanford Tank Farms Flammable Gas Safety Strategy.
• October 12, 2017, Board letter transmitting the Technical Report entitled, Flammable Gas and Criticality Hazards at the Waste Treatment and Immobilization Plant (DNFSB/TECH-42), for DOE’s information and use.
• August 7, 2017, Board letter transmitting the DNFSB Staff Issue Report, Alternative Methodology for Safety Integrity Level Determination of Instrumented Systems at the Low-Activity Waste Pretreatment System, for DOE's information and use.
• July 6, 2017, Board letter stating that the Board concurs that the control set documented in Revision 2 of the preliminary documented safety analysis for the Hanford Sludge Treatment Project Engineered Container Retrieval and Transfer System provides adequate protection to the public on the Columbia River, the letter also transmits the Technical Report entitled, Spray Release Accidents at the Hanford Sludge Treatment Project (DNFSB/TECH-41) for DOE’s information and use as necessary.
• May 1, 2017, FY2016 Annual Report to Congress on DOE's activities relating to the Defense Nuclear Facilities Safety Board.
• April 27, 2017, DNFSB Twenty-Seventh Annual Report to Congress for Calendar Year 2016.
• February 1, 2017, Department letter transmitting the Fiscal Year 2016 Annual Metrics report on the Nuclear Criticality Safety Criteria.
• January 24, 2017, Department letter documenting the progress made to address a number of technical issues associated with the Waste Treatment and Immobilization Plant (WTP) at Hanford.

• December 27, 2016, Department letter informing the Board of the delay in the completion date for Action 3-1 (Provide safety-significant annulus level detectors in each of the double-shell tank annuli where flammable gas exists) of Recommendation 2012-2, Hanford Tank Farm Flammable Gas Safety Strategy.
• October 13, 2016, Department letter communicating a 3-year delay for completing the implementation of Design/Operational Improvements 2 and 3 for the 242-A Evaporator facility at Hanford.
• September 16, 2016, Board letter documenting the DOE progress made during fiscal year 2016 for Recommendation 2012-2, Hanford Tank Farms Flammable Gas Safety Strategy.
• September 5, 2016, FY2015 Annual Report to Congress on DOE's activities relating to the Defense Nuclear Facilities Safety Board.
• April 19, 2016, Department letter transmitting the Fiscal Year 2015 annual metrics table on the nuclear criticality safety criteria.
• April 4, 2016, Board letter documenting the quality assurance deficiencies related to the storage of safety-related structures, systems, and components at the Waste Treatment and Immobilization Plant.
• March 30, 2016, DNFSB Twenty-Sixth Annual Report to Congress for Calendar Year 2015.
• March 24, 2016, Department letter transmitting the revised Implementation Plan for Recommendation 2012-2, Hanford Tank Farms Flammable Gas Safety Strategy.
• January 20, 2016, Board letter transmitting the Technical Report entitled, Plugging and Wear of Process Piping at the Waste Treatment and Immobilization Plant (DNFSB/TECH-40), for DOE's information and use.
• January 8, 2016, Department letter updating the status of activities to resolve issues associated with ammonia used in the melter off-gas treatment at the Waste Treatment and Immobilization Plant at Hanford.

• November 18, 2015, Department letter responding to the Board letter dated August 21, 2015, documenting DOE's position on controlling river access, protecting public receptors from accidents during slurry transfers, and the technical basis for this position, for the Sludge Treatment Project at Hanford.
• October 27, 2015, Department letter responding to the Board letter of December 5, 2014, and transmitting its evaluation of the streamlined approach to upgrade the Double-Shell Tank primary ventilation system at the Hanford site.
• October 26, 2015, Board letter communicating its evaluation on DOE’s progress for Recommendation 2012-2, Hanford Tank Farms Flammable Gas Safety Strategy, and requesting an update of the DOE Implementation Plan (IP) to reflect current delivery dates of IP deliverables.
• August 21, 2015, Board letter transmitting its report, Review of the Sludge Treatment Project Preliminary Documented Safety Analysis Hydrogen Hazards, for DOE’s consideration and use in ensuring that the final design adequately meets DOE safety requirements.
• August 21, 2015, Board letter establishing a 45-day reporting requirement for a report describing DOE's position on controlling River access and protecting public receptors from accidents during slurry transfers, and the technical basis for this position, for the Sludge Treatment Project at Hanford.
• July 24, 2015, Department letter documenting DOE’s plan to develop a nuclear safety control strategy for the confinement ventilation system under the effects of a seismic design basis accident at the High-Level Waste Facility, in response to the Board letter of February 2, 2015.
• July 21, 2015, Department letter transmitting the Office of Environmental Management's deliverable for Action 2-13 (site-specific safety culture sustainment tools) of the Implementation Plan for Recommendation 2011-1, Safety Culture at the Waste Treatment and Immobilization Plant.
• July 6, 2015, FY2014 Annual Report to Congress on DOE's activities relating to the Defense Nuclear Facilities Safety Board.
• June 12, 2015, Department letter transmitting the FY2014 Annual Report on Nuclear Criticality Safety.
• June 12, 2015, Board letter recognizing Mr. Mark Hahn, DOE-RL, on being honored as the recipient of the 2014 DOE Annual Safety System Oversight Award.
• June 12, 2015, Board letter recognizing Mr. Joshua Allen, DOE-RL, on being honored as the 2014 DOE Facility Representative of the Year.
• June 5, 2015, Department letter documenting DOE’s path forward for developing a nuclear safety control strategy for hydrogen explosion hazards in the High-Level Waste Facility at the Hanford Waste Treatment and Immobilization Plant, in response to the Board letter of January 21, 2015.
• May 14, 2015, Board letter transmitting the results of the Board staff’s review of Safety Design Strategy and Conceptual Safety Design Report for the Low Activity Waste Pretreatment System (LAWPS) Project at the Hanford Site
• May 8, 2015, Board Project Letter describing the open safety issues for the High-Level Waste Facility at the Waste Treatment and Immobilization Plant
• April 7, 2015, Board letter communicating its annual assessment on DOE’s progress for Recommendation 2011-1, Safety Culture at the Waste Treatment and Immobilization Plant.
• March 25, 2015, Board letter detailing technical concerns documented in the Board Staff Issue Report, "Aerosol Entrainment Coefficient Based on Testing and Data Analyses for the Waste Treatment and Immobilization Plant".
• March 11, 2015, DNFSB Twenty-Fifth Annual Report to Congress for Calendar Year 2014.
• March 9, 2015, Department letter documenting DOE's intent and plan to address melter accident scenarios to support development of safety basis for the High-Level Waste facility at the Waste Treatment and Immobilization Plant, in response to the Board letter of December 5, 2014.
• March 6, 2015, Board letter transmitting the report, "Review of the System Back Out Plan and Ventilation System for the Plutonium Finishing Plant Project" for DOE’s information and use as the Department pursues hazardous cleanup missions at Hanford.
• February 11, 2015, Department letter responding to the Board letter of October 23, 2014, outlining DOE's intent and plan to incorporate the updated Hanford volcanic ashfall hazard assessment into the WTP design and nuclear facility safety basis.
• February 6, 2015, Department letter transmitting deliverable for Action 5-1 of the Implementation Plan for Recommendation 2012-2, Hanford Tank Farms Flammable Gas Safety Strategy.
• February 2, 2015, Board letter establishing a 90-day reporting requirement for a report documenting DOE’s plan to develop a nuclear safety control strategy for the confinement ventilation system under the effects of a seismic design basis accident at the High-Level Waste Facility.
• January 21, 2015, Board letter establishing a 90-day reporting requirement for a report documenting DOE’s path forward for developing a nuclear safety control strategy for hydrogen explosion hazards in the High-Level Waste Facility at the Hanford Waste Treatment and Immobilization Plant.

• December 19, 2014, Department letter providing the status for Action 1-6 of the Implementation Plan for Recommendation 2011-1, Safety Culture at the Waste Treatment and Immobilization Plant.
• December 9, 2014, Board letter closing issues regarding the design of instrumentation and control systems at the Waste Treatment and Immobilization Plant.
• December 5, 2014, Board letter establishing a 90-day reporting requirement for a report documenting DOE's plan to address all design basis melter accident scenarios to support development of safety basis for the High-Level Waste facility at the Waste Treatment and Immobilization Plant.
• December 5, 2014, Board letter establishing a reporting requirement for an updated report and briefing on the safety strategy for upgrading the double-shell tank ventilation.
• November 24, 2014, Department letter responding to the Board letter of September 24, 2014, providing an updated plan and schedule for addressing the Board’s concerns with potential releases of ammonia at the Waste Treatment and Immobilization Plant.
• November 13, 2014, Department letter transmitting the Office of Environmental Management’s deliverable for Action 2-12 of the Implementation Plan for Recommendation 2011-1, Safety Culture at the Waste Treatment and Immobilization Plant.
• October 30, 2014, Department letter providing a clarification to the letter dated September 10, 2014, regarding deliverable 1-2 of the Implementation Plan for Recommendation 2012-2, Hanford Tank Farms Flammable Gas Safety Strategy.
• October 23, 2014, Board letter establishing a 90-day reporting requirement for DOE's intent and plan to include the updated volcanic ashfall hazard assessment into the WTP design and safety basis.
• September 26, 2014, Department letter transmitting the Office of Environmental Management’s deliverable for Action 2-10 of the Implementation Plan for Recommendation 2011-1, Safety Culture at the Waste Treatment and Immobilization Plant.
• September 24, 2014, Board letter establishing a 60-day reporting requirement for an updated plan and schedule for addressing the Board’s concerns with potential releases of ammonia at the Waste Treatment and Immobilization Plant (WTP).
• September 19, 2014, Board letter transmitting the September 2014 Periodic Report to Congress on the status of significant unresolved issues with DOE’s design and construction projects.
• September 10, 2014, Department letter transmitting deliverable 1-2 of the Implementation Plan for Recommendation 2012-2, Hanford Tank Farms Flammable Gas Safety Strategy.
• September 10, 2014, Department letter transmitting deliverable 1-3 of the Implementation Plan for Recommendation 2012-2, Hanford Tank Farms Flammable Gas Safety Strategy.
• August 29, 2014, Department letter informing the Board of the changes in the expected delivery dates for certain deliverables in the DOE Implementation Plan for Recommendation 2012-2, Hanford Tank Farms Flammable Gas Safety Strategy.
• August 28, 2014, Department letter responding to the Board letter of June 18, 2014, concerning the Safety Basis for the 242-A Evaporator facility at the Hanford site.
• July 9, 2014, Department letter transmitting the FY2013 Annual Report on Nuclear Criticality Safety.
• June 30, 2014, Department letter transmitting deliverable from the Office of Environmental Management for Action 2-11 of the Implementation Plan for Recommendation 2011-1, Safety Culture at the Waste Treatment and Immobilization Plant.
• June 18, 2014, Board letter establishing a 90-day reporting requirement, (or prior to the introduction of radioactive waste into the facility) for a report that addresses concerns pertaining to the Safety Basis for the 242-A Evaporator facility at the Hanford site.
• June 6, 2014, FY2013 Annual Report to Congress on DOE's activities relating to the Defense Nuclear Facilities Safety Board.
• May 29, 2014, Department letter transmitting deliverables 2-8 and 2-9 of the Implementation Plan for Recommendation 2011-1, Safety Culture at the Waste Treatment and Immobilization Plant.
• May 2, 2014, Board project letter for the Sludge Treatment Project (STP) also known as the Engineered Container Retrieval and Transfer System (ECRTS), at the Hanford Site.
• April 28, 2014, Department letter providing further information related to the safety analysis and design of the slurry transport system in the Pretreatment Facility of the Waste Treatment and Immobilization Plant.
• April 23, 2014, Board letter indicating the Board’s closure of the preliminary design and safety basis issue for Phase 1 of the Sludge Treatment Project (STP).
• April 3, 2014, Department letter transmitting the Y-12 Safety Conscious Work Environment Self-Assessment Report, per commitment 2-5 of the DOE Implementation Plan for Recommendation 2011-1, Safety Culture at the Waste Treatment and Immobilization Plant.
• March 19, 2014, Department letter transmitting deliverable 4-2 (Demonstrate current capabilities to recover from a loss of ventilation) of the DOE Implementation Plan for Recommendation 2012-2, Hanford Tank Farms Flammable Gas Safety Strategy.
• March 19, 2014, Department letter transmitting deliverable 2-7 of the Implementation Plan for Board Recommendation 2011-1, Safety Culture at the Waste Treatment and Immobilization Plant.
• March 6, 2014, DNFSB Twenty-Fourth Annual Report to Congress for Calendar Year 2013.
• February 19, 2014, Department letter in response to the Board letter of November 1, 2013, regarding the safety implications of removing a portion of the radioactive liquid from tank 241-AY-102 at the Hanford site.
• January 31, 2014, Department letter transmitting deliverable 2-1 of the Implementation Plan for Recommendation 2012-2, Hanford Tank Farms Flammable Gas Safety Strategy.

• November 25, 2013, Department letter transmitting deliverable 2-3 of the Implementation Plan for Defense Nuclear Facilities Safety Board Recommendation 2011-1, Safety Culture at the Waste Treatment and Immobilization Plant (WTP).
• November 1, 2013, Board letter providing its perspective on the safety implications of removing a portion of the radioactive liquid from tank 241-AY-102 at the Hanford site.
• October 4, 2013, Department letter transmitting deliverable 2-5 (Safety Conscious Work Environment self-assessment reports for National Nuclear Security Administration's federal and contractor organizations) of the Department's Implementation Plan for Recommendation 2011-1, Safety Culture at the Waste Treatment and Immobilization Plant.
• October 1, 2013, Department letter transmitting deliverable 2-5 (Safety Conscious Work Environment self-assessment reports for the Office of Science Defense Nuclear Facilities) of the Department's Implementation Plan for Recommendation 2011-1, Safety Culture at the Waste Treatment and Immobilization Plant.
• September 30, 2013, Department letter transmitting deliverable 2-5 (Safety Conscious Work Environment self-assessment reports for the Office of Environmental Management (EM) Federal and contractor Organizations) of the Department's Implementation Plan for Recommendation 2011-1, Safety Culture at the Waste Treatment and Immobilization Plant.
• September 27, 2013, Department letter providing a summary of schedule changes for some deliverables in the Department's Implementation Plan for Recommendation 2011-1, Safety Culture at the Waste Treatment and Immobilization Plant.
• September 11, 2013, Department letter responding to the Board letter of July 15, 2013, and providing a schedule for the revised implementation plan for Recommendation 2010-2, Pulse Jet Mixing at the Waste Treatment and Immobilization Plant.
• September 6, 2013, FY2012 Annual Report to Congress on DOE's activities relating to the Defense Nuclear Facilities Safety Board.
• August 1, 2013, Department letter informing the Board that the expected completion date for Action 1-6 of the Department's Implementation Plan for Recommendation 2011-1 is June 2014.
• July 17, 2013, Board letter accepting the Department’s Implementation Plan for Recommendation 2012-2, Hanford Tank Farms Flammable Gas Safety Strategy.
• July 15, 2013, Board letter establishing a 60-day reporting requirement for a report that provides the schedule for completing a revised Recommendation 2010-2 implementation plan, and a 90-day reporting requirement for a briefing that describes in detail the design verification philosophy DOE will employ to demonstrate reliable operation of the pulse jet mixers. The Board also requests the designation of the responsible manager for this recommendation.
• June 6, 2013, Department letter transmitting the Implementation Plan for Recommendation 2012-2, Hanford Tank Farms Flammable Gas Safety Strategy.
• May 30, 2013, Department letter transmitting deliverable "Validation and Effectiveness Review of ORP and BNI safety culture improvements" for Action 1-9 of the Implementation Plan for Recommendation 2011-1, Safety Culture at the Waste Treatment and Immobilization Plant.
• April 30, 2013, Department letter transmitting the second deliverable for Action 1-8 of the Implementation Plan for Recommendation 2011-1, Safety Culture at the Waste Treatment and Immobilization Plant.
• April 19, 2013, Department letter notifying the Board that DOE is executing a 45 day extension for completing the implementation plan for Recommendation 2012-2, Hanford Tank Farms Flammable Gas Safety Strategy.
• March 27, 2013, Board letter transmitting its Twenty-Third Annual Report to Congress for Calendar Year 2012.
• March 25, 2013, Department letter transmitting the DOE Annual Report on Nuclear Criticality Safety for Fiscal Year 2012.
• March 4, 2013, Department letter informing the Board that DOE has completed the implementation of the Tank Farms Documented Safety Analysis upgrade.
• January 7, 2013, Department letter accepting Board Recommendation 2012-2, Hanford Tank Farms Flammable Gas Safety Strategy.

• December 31, 2012, Department letter transmitting deliverable 5.5.3.1 of the Implementation Plan for Recommendation 2010-2, Pulse Jet Mixing at the Waste Treatment and Immobilization Plant (WTP).
• December 21, 2012, Department letter providing a summary of schedule changes for some deliverables in the Implementation Plan for Board Recommendation 2011-1, Safety Culture at the Waste Treatment and Immobilization Plant.
• December 20, 2012, Department letter providing a status update on the Board’s August 8, 2012, Letter concerning deficiencies in the safety analysis and the design of the WTP slurry transport system at the Hanford Site.
• November 27, 2012, Department letter requesting a 45-day extension to respond to Board Recommendation 2012-2, Hanford Tank Farms Flammable Gas Safety Strategy.
• November 8, 2012, Department letter regarding the status of DOE's revision to the Implementation Plan for Recommendation 2010-2, Pulse Jet Mixing at the Waste Treatment and Immobilization Plant.
• November 6, 2012, Department letter requesting a 45-day extension to respond to the Board letter of August 8, 2012, regarding issues related to deficiencies in the safety analysis and the design of the WTP slurry transport system.
• October 31, 2012, Department letter transmitting deliverable 5.5.3.6 (third of three test plans to establish Tank Farm performance capability) of the Implementation Plan for Recommendation 2010-2, Pulse Jet Mixing at the Waste Treatment and Immobilization Plant.
• September 28, 2012, Board letter forwarding Recommendation 2012-2, Hanford Tank Farms Flammable Gas Safety Strategy.
• September 27, 2012, Department letter responding to the Board letter of April 13, 2012, concerning the operability and safety of the electrical distribution system at the Waste Treatment and Immobilization Plant.
• September 14, 2012, Department letter transmitting the Implementation Plan Addendum for Recommendation 2011-1, Safety Culture at the Waste Treatment and Immobilization Plant.
• August 27, 2012, Department letter providing a status update and documenting the need to revise the Implementation Plan for Recommendation 2010-2, Pulse Jet Mixing at the Waste Treatment and Immobilization Plant.
• August 16, 2012, Department letter transmitting deliverable 5.5.3.6 (second of three test plans to establish Tank Farm performance capability) of the Implementation Plan for Recommendation 2010-2, Pulse Jet Mixing at the Waste Treatment and Immobilization Plant.
• August 8, 2012, Board letter establishing a 90-day reporting requirement to address issues related to deficiencies in the safety analysis and the design of the WTP slurry transport system.
• August 1, 2012, Department letter transmitting deliverable 6.3.1, Quarterly Progress Report for April through June 2012, of the Implementation Plan for Recommendation 2010-2, Pulse Jet Mixing at the Waste Treatment and Immobilization Plant.
• July 31, 2012, Board letter regarding the preliminary design activities and safety basis development for Phase I of the Sludge Treatment Project at Hanford.
• July 31, 2012, Department letter transmitting deliverables associated with commitments 1-5, 2-2, and 2-4 of the Implementation Plan for Recommendation 2011-1, Safety Culture at the Waste Treatment and Immobilization Plant.
• July 27, 2012, Department letter responding to the Board letter of April 3, 2012, regarding how the FLUENT model will be appropriately validated prior to use for mixing system design confirmation at WTP.
• July 17, 2012, Department letter transmitting deliverable 5.3.3.1 and Cancellation of Deliverables 5.3.3.2 and 5.3.3.3 of the Implementation Plan for Board Recommendation 2010-2, Pulse Jet Mixing at the Waste Treatment and Immobilization Plant.
• July 17, 2012, Department letter transmitting deliverable 5.7.3.2 (WTP Interface Management Plan) of the Implementation Plan for Recommendation 2010-2, Pulse Jet Mixing at the Waste Treatment and Immobilization Plant.
• June 27, 2012, Department letter transmitting deliverable 5.5.3.2 (One System Evaluation of Waste Transferred to the Waste Treatment Plant) of the Implementation Plan for Recommendation 2010-2, Pulse Jet Mixing at the Waste Treatment and Immobilization Plant.
• June 25, 2012, Board letter enclosing a copy of the Board’s Report to Congress on the Status of Significant Unresolved Issues with the Department of Energy's Design and Construction Projects.
• June 14, 2012, Board letter recognizing Ms. Elaine N. Diaz of the Hanford Site Office of River Protection as the winner of the 2011 Department of Energy Safety System Oversight Annual Award.
• June 8, 2012, FY2011 Annual Report to Congress on DOE's activities relating to the Defense Nuclear Facilities Safety Board.
• May 29, 2012, Department letter transmitting deliverable 5.3.3.5, National Energy Technology Laboratory review of the BNI Experimental Data Gap Analysis for Computational Fluid Dynamics Verification & Validation, of Recommendation 2010-2, Pulse Jet Mixing at the Waste Treatment and Immobilization Plant.
• May 29, 2012, Department letter transmitting deliverable 5.5.3.6, Test Plan to Establish Tank Farm Performance Capability, of Recommendation 2010-2, Pulse Jet Mixing at the Waste Treatment and Immobilization Plant.
• May 21, 2012, Department letter transmitting the Bechtel National Inc.’s “Comprehensive Corrective Action Plan for Strengthening the Nuclear Safety and Quality Culture at the Hanford Tank Waste Treatment and Immobilization Plant” relating to deliverable 1-4 of the Implementation Plan for Board Recommendation 2011-1, Safety Culture at the Waste Treatment and Immobilization Plant.
• May 18, 2012, Department letter requesting a 60-day extension to provide the report and briefing on the approach to be used to resolve issues with the WTP project's FLUENT model.
• May 18, 2012, Department letter regarding the K-Basin Sludge Treatment Project at the Hanford site.
• May 1, 2012, Department letter transmitting deliverable associated with Action 1-8 of the Implementation Plan for Recommendation 2011-1, Safety Culture at the Waste Treatment and Immobilization Plant.
• April 30, 2012, Department letter transmitting deliverable 6.3.1, Quarterly Progress Report for January through March 2012, of the Implementation Plan for Recommendation 2010-2, Pulse Jet Mixing at the Waste Treatment and Immobilization Plant.
• April 30, 2012, Department letter regarding the use of Newtonian analysis techniques to assess non-Newtonian vessel performance, associated with Commitment 5.3.3.1 of the Implementation Plan for Recommendation 2010-2, Pulse Jet Mixing at the Waste Treatment and Immobilization Plant.
• April 30, 2012, Department letter transmitting deliverable 5.2.3.1 of the Implementation Plan for Recommendation 2010-2, Pulse Jet Mixing at the Waste Treatment and Immobilization Plant.
• April 30, 2012, Department letter transmitting deliverable 5.1.3.14 of the Implementation Plan for Recommendation 2010-2, Pulse Jet Mixing at the Waste Treatment and Immobilization Plant.
• April 23, 2012, Department letter responding to the Board letter of March 2, 2012, requesting an update to the Implementation Plan for Recommendation 2011-1, Safety Culture at the Waste Treatment and Immobilization Plant.
• April 13, 2012, Board letter establishing a 120-day reporting requirement for actions DOE has taken or plans to take to address the issues related to the design and construction of the electrical distribution system for the Waste Treatment and Immobilization Plant (WTP) at Hanford.
• April 3, 2012, Board letter establishing a 45-day reporting requirement for identifying the approach to be used to resolve the issues relating to how the FLUENT model will be appropriately validated prior to use for mixing system design confirmation.
• April 2, 2012, Department letter regarding planned improvements and safety basis amendment for the Double-Shell Tank primary ventilation systems at Hanford.
• March 30, 2012, Department letter transmitting deliverable 5.6.3.1 of the Implementation Plan for Recommendation 2010-2, Pulse Jet Mixing at the Waste Treatment and Immobilization Plant.
• March 30, 2012, Department letter requesting a 30-day extension to complete the response to the Board regarding K-Basin Sludge Treatment Project at the Hanford site.
• March 29, 2012, Department letter transmitting deliverable 5.1.3.2 of the Implementation Plan for Recommendation 2010-2, Pulse Jet Mixing at the Waste Treatment and Immobilization Plant.
• March 29, 2012, Department letter transmitting deliverable 5.5.3.5 of the Implementation Plan for Recommendation 2010-2, Pulse Jet Mixing at the Waste Treatment and Immobilization Plant.
• March 8, 2012, Board letter enclosing a copy of the Board’s Report to Congress on the Status of Significant Unresolved Issues with the Department of Energy's Design and Construction Projects.
• March 5, 2012, Department letter in response to Board letter of January 20, 2012 regarding wear allowances in the design of piping, process vessels, and Pulse Jet Mixers at the Waste Treatment and Immobilization Plant.
• March 2, 2012, Board letter accepting the Implementation Plan (IP) for Recommendation 2011-1, Safety Culture at the Waste Treatment and Immobilization Plant, with a request for a revised IP by April 30 that takes into account information gained from the January 2012 HSS report.
• March 2, 2012, Department letter transmitting deliverable 1-7 (revised WTP Project Execution Plan) of the Department's Implementation Plan for Recommendation 2011-1, Safety Culture at the Waste Treatment and Immobilization Plant.
• February 28, 2012, Department letter transmitting the completion of Action 1-2 of the Implementation Plan for Recommendation 2011-1, Safety Culture at the Waste Treatment and Immobilization Plant.
• February 28, 2012, Department letter transmitting the Annual Report on Nuclear Criticality Safety for Fiscal Year 2011.
• February 24, 2012, Department letter transmitting deliverable 1-4 of the Implementation Plan for Recommendation 2011-1, Safety Culture at the Waste Treatment and Immobilization Plant.
• February 17, 2012, DNFSB Twenty-Second Annual Report to Congress for Calendar Year 2011.
• January 31, 2012, Department letter transmitting deliverable 6.3.1, quarterly progress report, of the Implementation Plan for Recommendation 2010-2, Pulse Jet Mixing at the Waste Treatment and Immobilization Plant.
• January 30, 2012, Department letter transmitting deliverable 5.5.3.4 of the Implementation Plan for Recommendation 2010-2, Pulse Jet Mixing at the Waste Treatment and Immobilization Plant.
• January 30, 2012, Department letter transmitting deliverable 1-3, descriptions of the contractor and federal safety culture oversight process, of the Implementation Plan for Recommendation 2011-1, Safety Culture at the Waste Treatment and Immobilization Plant.
• January 30, 2012, Department letter transmitting deliverable 5.7.3.1 of the Implementation Plan for Recommendation 2010-2, Pulse Jet Mixing at the Waste Treatment and Immobilization Plant.
• January 27, 2012, Department letter transmitting deliverable 5.3.3.4, analysis of data sets required to support CFD V&V, of the Implementation Plan for Recommendation 2010-2, Pulse Jet Mixing at the Waste Treatment and Immobilization Plant.
• January 24, 2012, Department letter transmitting deliverable 2-1 of the Implementation Plan for Recommendation 2011-1, Safety Culture at the Waste Treatment and Immobilization Plant.
• January 20, 2012, Board letter establishing a 45-day reporting requirement for identifying the approach to be used to resolve issues relating to erosion/corrosion wear allowances for Waste Treatment and Immobilization Plant piping and vessels.
• January 19, 2012, Board letter accepting the Implementation Plan for Recommendation 2010-2, Pulse Jet Mixing at the Waste Treatment and Immobilization Plant.
• January 12, 2012, Department letter transmitting deliverable 5.7.3.4 of the Implementation Plan for Recommendation 2010-2, Pulse Jet Mixing at the WTP.

• December 27, 2011, Department letter transmitting the Implementation Plan for Board Recommendation 2011-1, Safety Culture at the Waste Treatment and Immobilization Plant.
• December 9, 2011, Department letter responding to the Board letter of October 6, 2011 regarding the Maintenance Program at the Hanford Waste Encapsulation and Storage Facility.
• November 16, 2011, Department letter responding to the Board letter of September 13, 2011, regarding hazards and controls associated with the anhydrous ammonia system at the Waste Treatment and Immobilization Plant.
• November 16, 2011, Department letter responding to the Board letter of August 3, 2011, regarding the modeling of heat transfer from Pretreatment Facility process vessels at the Waste Treatment and Immobilization Plant.
• November 10, 2011, Department letter transmitting the Implementation Plan for Board Recommendation 2010-2, Pulse Jet Mixing at the Waste Treatment and Immobilization Plant
• October 13, 2011, Board letter regarding DOE's clarification response on September 19, 2011, on Recommendation 2011-1, Safety Culture at the Waste Treatment and Immobilization Plant.
• October 6, 2011, Board letter establishing a 60-day reporting requirement regarding the Maintenance Program at the Hanford Waste Encapsulation and Storage Facility.
• September 30, 2011, Department letter requesting a 45-day extension to respond to the Board's letter of August 3, 2011 concerning the validity of the heat transfer analyses from process vessels in the Pretreatment Facility at Hanford’s Waste Treatment and Immobilization Plant.
• September 30, 2011, Department letter informing the Board that the Documented Safety Analysis for the Tank Farms at Hanford would be completed by the end of November 2011.
• September 28, 2011, Department letter in response to Board letter of March 30, 2011, regarding conduct of operations at the Hanford Tank Farms.
• September 23, 2011, Board letter forwarding a copy of the Report to Congress on the Status of Significant Unresolved Issues with the Department of Energy Design and Construction Projects.
• September 23, 2011, Department letter requesting a 45-day extension to submit the Implementation Plan for Board Recommendation 2010-2, Pulse Jet Mixing at the Waste Treatment and Immobilization Plant.
• September 19, 2011, Department letter in response to the Board's letter of August 12, 2011, seeking clarifications to DOE's response to Board Recommendation 2011-1, Safety Culture at the Waste Treatment and Immobilization Plant.
• September 13, 2011, Board letter establishing a 60-day reporting requirement on the hazards and controls associated with the anhydrous ammonia system at the Waste Treatment and Immobilization Plant.
• August 29, 2011, FY2010 Annual Report to Congress on DOE's activities relating to the Defense Nuclear Facilities Safety Board.
• August 12, 2011, Board letter clarifying and establishing a 45-day requirement for responding to Recommendation 2011-1, Safety Culture at the Waste Treatment and Immobilization Plant.
• August 5, 2011, Department letter responding to the Board letter of June 7, 2011, on the use of the Low Order Accumulation Model for accumulation of solids in WTP vessel calculations.
• August 3, 2011, Board letter establishing a 60-day reporting requirement on the validity of the heat transfer analyses from process vessels in the Pretreatment Facility at Hanford’s Waste Treatment and Immobilization Plant.
• July 25, 2011, Department letter responding to the Board letter of April 26, 2011, concerning the waste transfer system at the Hanford Tank Farms
• July 25, 2011, Department letter indicating that the planned completion date for updating the Hanford Tank Farms Documented Safety Analysis is projected for September 2011
• July 1, 2011, Department letter responding to the May 5, 2011, Board letter regarding the design of instrumentation and control system at the WTP.
• June 30, 2011, Department letter regarding the Sludge Treatment Project at Hanford in response to the Board’s June 15, 2011, Report to Congress.
• June 30, 2011, Department letter responding to Board Recommendation 2011-1, Safety Culture at the Waste Treatment and Immobilization Plant.
• June 30, 2011, Board letter responding to the June 22, 2011, DOE Letter requesting access to the Board's investigative files pertaining to Recommendation 2011-1, Safety Culture at the Waste Treatment and Immobilization Plant.
• June 23, 2011, Department letter regarding K-Basin Sludge Treatment Project schedule at the Hanford site.
• June 22, 2011, Department letter requesting access to DNFSB's investigative record in order to assess and respond to Recommendation 2011-1, Safety Culture at the Waste Treatment and Immobilization Plant.
• June 20, 2011, Department letter stating the final decision to accept Recommendation 2010-2, Pulse Jet Mixing at the Waste Treatment and Immobilization Plant.
• June 15, 2011, Board letter forwarding a copy of the Report to Congress on the Status of Significant Unresolved Issues with the Department of Energy's Design and Construction Projects (dated June 15, 2011).
• June 9, 2011, Board letter forwarding Recommendation 2011-1, Safety Culture at the Waste Treatment and Immobilization Plant.
• June 7, 2011, Board letter establishing a 60-day reporting requirement on the continued use of the Low Order Accumulation Model for accumulation of solids in WTP vessel calculations.
• June 3, 2011, Board letter congratulating Dale West of Hanford’s Richland Operations Office for being honored as the winner of the 2010 DOE Safety System Oversight Annual Award.
• May 27, 2011, Department letter requesting a 30-day extension to respond to the Board's letter of May 5, 2011, regarding the design of instrumentation and control system at the Waste Treatment and Immobilization Plant at Hanford.
• May 20, 2011, Board letter reaffirming Recommendation 2010-2, Pulse Jet Mixing at the Waste Treatment and Immobilization Plant, with a 30-day final decision requirement to implement all or part of the Recommendation.
• May 5, 2011, Board letter establishing a 30-day reporting requirement for a briefing and report to address the deficiencies in the instrumentation and control system design for the WTP.
• May 2, 2011, Department letter updating activities with regard to Quality Assurance activities including Suspect Counterfeit Items and flow-down of requirements to contractors and sub-contractors.
• April 26, 2011, Board letter establishing a 90-day reporting requirement for a briefing and report on actions to address the deficiencies associated with the waste transfer system at Hanford.
• April 5, 2011, Board letter establishing a 60-day reporting requirement on the Department's spray leak analysis and methodology for the Waste Treatment and Immobilization Plant.
• March 30, 2011, Board letter concerning recent Conduct of Operations observations at the Hanford Tank Farms.
• March 15, 2011, Department letter transmitting the DOE Annual Report on Nuclear Criticality Safety for calendar year 2010.
• February 25, 2011, Board letter and staff report regarding activity-level work planning and control processes and their implementation at Washington Closure Hanford, LLC.
• February 25, 2011, Department letter forwarding WTP Structural and Equipment Peer Review Teams' reports.
• February 25, 2011, Department letter updating activities to address issues identified by the Board at the Hanford Tank Farms.
• February 10, 2011, Department letter accepting Board Recommendation 2010-2, Pulse Jet Mixing at the Waste Treatment and Immobilization Plant.
• February 8, 2011, DNFSB Twenty-First Annual Report to Congress for Calendar Year 2010.
• January 5, 2011, Department letter transmitting additional written material for the public record regarding Safety Related Aspects of the Design and Construction of the WTP.

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