Departmental Representative to the Defense Nuclear Facilities Safety Board

Los Alamos National Laboratory

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This page last updated Wednesday, November 20, 2024

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• Los Alamos Field Office Contact for Board Issues
• EHSS-1.1 Site Contact
• LANL Website
• Related Recommendations:  2011-1, 2009-2, 97-2, 97-1, 95-2, 94-1, 93-6, 93-3, 93-1

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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
• 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.
• May 3, 2024, Department letter in response to DNFSB Recommendation 2023-1, Onsite Transportation Safety.
• 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.
• April 10, 2024, Board letter regarding safety issues pertaining to the glovebox safety and glovebox glove integrity programs at LANL and establishing a 120-day reporting requirement for NNSA to provide a briefing to address these safety issues and NNSA's plans for disseminating lessons-learned from the glovebox loss of integrity events investigated at LANL.
• April 9, 2024, Board letter providing its review of the Pantex Plant False Ceiling Replacement and identifying opportunities for safety improvement for DOE's information and use. The Board also identified safety concerns regarding cast iron fittings in the fire suppression systems at Pantex and LANL Plutonium Facility and advises DOE to communicate the issue complex-wide through use of an Operating Experience Level 1 or 2 document.
• March 29, 2024, Board letter granting the DOE request for a 45-day extension to provide a response for Recommendation 2023-1, Onsite Transportation Safety.
• 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
• January 26, 2024, Board letter transmitting Recommendation 2023-1, Onsite Transportation Safety
• January 19, 2024, Board letter transmitting the report from its review of the Chemical Compatibility Program for Transuranic Waste at NNSA facilities at LANL, for DOE's use and information.
• January 18, 2024, Department letter providing LANL PF-4 MELCOR Leak Path Factor Parametric Report, and PF-4 Fire Suppression System Documented Safety Analysis Functional Requirements.

• November 20, 2023, Department letter transmitting Deliverables 1 and 2 pertaining to the safety systems at the Plutonium Facility Building 4 (PF-4) at the Los Alamos National Laboratory.
• November 20, 2023, Department letter transmitting Deliverable 4, Ventilation System Crosswalk, pertaining to the safety systems at the Plutonium Facility Building 4 (PF-4) at the Los Alamos National Laboratory.
• 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.
• September 15, 2023, Department letter responding to the Board letter of June 20, 2023, and providing a report with additional information pertaining to the November 16, 2022, DNFSB public hearing on the safety of the Plutonium Facility at the Los Alamos National Laboratory.
• August 15, 2023, Board letter regarding seismic safety of the Plutonium Facility (PF-4) at LANL, noting LANL's commendable effort in assessing the seismic risk for PF-4.
• 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 20, 2023, Board letter establishing a 60-day reporting requirement for a report with additional information pertaining to the November 16, 2022, DNFSB public hearing on the safety of the Plutonium Facility at the Los Alamos National Laboratory.
• 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 19, 2023, Department letter responding to the Board letter of December 6, 2022, regarding the safety analysis of LANL PF-400 confinement ventilation and operability of the HEPA filter plenum deluge system.
• January 31, 2023, Department letter providing the FY 2022 Annual Metrics Report on Nuclear Criticality Safety Programs.

• December 19, 2022, Board letter regarding recent NNSA responses to Board reporting requirements and noting concerns that the provided responses only partially address the safety concerns identified in the Board's correspondence.
• December 6, 2022, Board letter concerning confinement ventilation system at the LANL PF-400 facility (currently the Radiological Laboratory Utility Office Building (RLUOB)) and establishing a 90-day reporting requirement for a report and briefing regarding the safety analysis of PF-400 and operability of the HEPA filter plenum deluge system.
• November 8, 2022, Department letter responding to the Board's letter of August 11, 2022, regarding LANL PF-4 Leak Path Factor analysis.
• 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, Department letter responding to the Board letter of June 16, 2022, relating to the nuclear criticality safety program at the National Criticality Experiments Research Center at NNSS.
• September 13, 2022, Department letter responding to the Board letter of January 6, 2022, regarding the adequacy of the LANL onsite transportation safety document and the onsite transportation safe harbors.
• 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.
• August 17, 2022, Board letter providing the results of its review of LANL Area G Safety Posture and Justifications for Continued Operation for DOE's information and use.
• August 11, 2022, Board letter concerning the LANL efforts to update the leak path factor analysis for PF-4 safety basis updates and establishing a 30-day reporting requirement for LANL analysis done in response to Field Office direction.
• August 11, 2022, Board letter providing the results its review of LANL PF-4 safety basis addendum that supports heat source plutonium operations.
• August 11, 2022, Board letter requesting availability of members of DOE/NNSA staff and contractor personnel for the Board's November 16, 2022, public hearing in Santa Fe, NM.
• 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 16, 2022, Board letter establishing a 90-day reporting requirement for a report and briefing to address safety questions related to the nuclear criticality safety program at the National Criticality Experiments Research Center at NNSS.
• June 1, 2022, Supplementary Agreement for Memorandum of Understanding Between the U.S. Department of Energy and the Defense Nuclear Facilities Safety Board
• May 12, 2022, Department letter noting that DOE/NNSA to provide the response to the Board's letter dated January 6, 2022, regarding the Los Alamos National Laboratory on-site Transportation Safety Document by July 6, 2022.
• March 30, 2022, Department letter providing the FY 2021 Annual Nuclear Criticality Safety Program Metrics report.
• March 15, 2022, Department letter responding to the Board letter dated November 24, 2021, regarding DOE's approval of Critical Decision-1 for the Los Alamos Plutonium Pit Production Project (LAP4) and describing DOE's strategy for the Plutonium Facility ventilation system.
• February 17, 2022, DOE-DNFSB Memorandum of Understanding
• January 6, 2022, Board letter establishing a 120-day reporting requirement for DOE to provide a briefing and report to address questions pertaining to the adequacy of the LANL onsite transportation safety document and the onsite transportation safe harbors.
• 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 24, 2021, Board letter regarding DOE's approval of Critical Decision-1 for the Los Alamos Plutonium Pit Production Project (LAP4) and establishing a 90-day reporting requirement for a report that describes DOE's strategy for the Plutonium Facility ventilation system, the planned end-state of the ventilation system, the schedule for achieving that end-state, and how the system will be credited in the facility 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.
• 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 29, 2021, Board letter congratulating Administrator Jill Hruby on her confirmation as the Administrator of NNSA and requesting a meeting opportunity to discuss the safety challenges and opportunities.
• 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.
• June 9, 2021, Board letter providing the results of its review of the reliability of safety structures, systems, and components at three facilities at the Los Alamos National Laboratory for DOE’s use and information.
• March 30, 2021, Department letter and report responding to the DNFSB letter dated September 24, 2020, regarding transuranic waste storage, handling, and processing across Los Alamos National Laboratory.
• March 23, 2021, Board letter providing a courtesy copy of the DNFSB Annual Report to Congress for Calendar Year 2020.
• February 5, 2021, Board letter in response to DOE letter dated January 19, 2021, and granting the extension request for DOE to provide a response regarding technical report DNFSB/TECH-46, Potential Energetic Chemical Reactions Events Involving Transuranic Waste at Los Alamos National Laboratory.
• January 19, 2021, Department letter requesting a 60-day extension to respond to the Board letter and technical report DNFSB/TECH-46, Potential Energetic Chemical Reactions Events Involving Transuranic Waste at Los Alamos National Laboratory, dated September 24, 2020.

• December 8, 2020, Board letter summarizing the results of its review of the draft safety basis for the Hazard Category 3 upgrade to the Radiological Laboratory Utility Office Building at LANL.
• October 21, 2020, Board letter providing the results of its review of the revised safety basis for the Transuranic Waste Facility (TWF) at LANL.
• September 24, 2020, Board letter transmitting its Technical Report, title (DNFSB-TECH-46) regarding transuranic waste storage, handling, and processing across Los Alamos National Laboratory, and establishing a 120-day reporting requirement for a report addressing 1) whether the hazards associated with the current transuranic waste container population at LANL are consistently and adequately controlled and DOE’s basis for this position, and 2) whether the revision to DOE Standard 5506 will address the broader implications of these concerns, as they are applicable to other DOE sites.
• June 23, 2020, Board letter providing the results of its review of the weapon response development process and the resulting technical basis documentation prepared for the W88 weapon program by Los Alamos National Laboratory.
• March 17, 2020, Board letter providing the Secretary a courtesy copy of its Annual Report to Congress for calendar year 2019.
• February 7, 2020, Department letter responding to the Board letter dated January 27, 2020, regarding information requested at EM-LA.
• January 15, 2020, Department letter transmitting the FY2019 Annual Criticality Safety Metrics Report.

• December 30, 2019, Board letter extending the due date for NNSA to provide a briefing on LANL PF-4 safety basis.
• 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 15, 2019, Board letter establishing a 60-day reporting requirement for a briefing on 1) the NNSA strategy for ensuring the deficient safety systems at the LANL Plutonium Facility will be upgraded in order to meet a schedule commensurate with future national security missions and 2) the approach for addressing the weaknesses in the analyses that support the Plutonium Facility safety basis.
• November 12, 2019, Board letter transmitting its Technical Report (DNFSB/TECH-44: Los Alamos National Laboratory Plutonium Facility Leak Path Factor Methodology) for DOE’s information and use.
• May 22, 2019, Board letter documenting the resolution of safety issues in the revised safety basis for the LANL Radioassay and Nondestructive Testing (RANT) Facility.
• May 21, 2019, FY2018 Annual Report to Congress on DOE's activities relating to the Defense Nuclear Facilities Safety Board.
• 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.

• November 28, 2018, Board letter transmitting the results of its review of the Nuclear Criticality Safety Program at Los Alamos National Laboratory.
• November 13, 2018, Board letters (5) inviting the NNSA and DOE-EM Field Office Managers and personnel at LANL, SNL, and WIPP to appear at the Board’s public hearing on DOE’s interface with the Defense Nuclear Facilities Safety Board be scheduled in February 2019 in Albuquerque, NM.
• September 3, 2018, FY2017 Annual Report to Congress on DOE's activities relating to the Defense Nuclear Facilities Safety Board.
• July 23, 2018, Board letter to Administrator Gordon-Hagerty congratulating her on her confirmation as Administrator of the National Nuclear Security Administration, and providing a brief summary of items for which the Board is conducting safety oversight.
• May 24, 2018, Board letter informing the Department that the Board plans to assess the impact to safety of any changes to operations and safety control strategy pertaining to fire protection at LANL Area G.
• March 23, 2018, DNFSB Twenty-Eighth Annual Report to Congress for Calendar Year 2017.
• January 24, 2018, Department letter transmitting the Fiscal Year 2017 Annual Metrics Report on the Nuclear Criticality Safety Criteria.
• January 19, 2018, DOE Briefings to DNFSB: Plutonium Pit Production Analysis of Alternatives (AoA) Results & Next Steps.

• November 9, 2017, Board letter transmitting the results of its review of the LANL Transuranic Waste Facility (TWF) documented safety basis for NNSA information.
• October 11, 2017, Board letter regarding emergency preparedness and response at the Los Alamos National Laboratory (LANL) to aid the DOE and NNSA in addressing LANL's weaknesses and in the broader implementation of Board Recommendation 2014-1, Emergency Preparedness and Response.
• July 13, 2017, Board letter transmitting the notational vote in which the Board decided to not issue and transmit to DOE the final Recommendation concerning Emergency Preparedness and Response at the Los Alamos National Laboratory.
• 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 23, 2017, DOE Briefings to DNFSB: LANL RANT Facility Seismic Upgrades Status Update.
• February 1, 2017, Department letter transmitting the Fiscal Year 2016 Annual Metrics report on the Nuclear Criticality Safety Criteria.
• January 3, 2017, Board letter closing Recommendation 2009-2, Los Alamos National Laboratory Plutonium Facility Seismic Safety.

• November 18, 2016, Board project letter stating that there is no safety issues based upon its review of critical decision 2 and 3 milestone documentation for the Plutonium Equipment Installation subproject at Los Alamos National Laboratory.
• September 5, 2016, FY2015 Annual Report to Congress on DOE's activities relating to the Defense Nuclear Facilities Safety Board.
• August 29, 2016, Department letter responding to the Board letter of May 12, 2016, providing NNSA’s assessment of vulnerabilities of the Fire Suppression System at the Plutonium Facility at Los Alamos National Laboratory.
• May 12, 2016, Board letter establishing a 90-day reporting requirement for NNSA’s assessment of the LANL Plutonium Facility’s Fire Suppression System vulnerabilities and their impact on the facility’s current and planned safety posture.
• April 19, 2016, Department letter transmitting the Fiscal Year 2015 annual metrics table on the nuclear criticality safety criteria.
• March 30, 2016, DNFSB Twenty-Sixth Annual Report to Congress for Calendar Year 2015.
• January 28, 2016, Department letter proposing a delay in providing quarterly briefings to the Board on the Radioassay and Nondestructive Testing Facility at Los Alamos National Laboratory until pertinent information becomes available.
• January 7, 2016, Board letter transmitting Preliminary Observations of Weaknesses Associated with Emergency Preparedness and Response at Los Alamos National Laboratory for DOE’s consideration.

• September 30, 2015, Board letter communicating its annual assessment on DOE’s activities and progress for Recommendation 2009-2, Los Alamos National Laboratory Plutonium Facility Seismic Safety.
• September 21, 2015, Board letter transmitting the Technical Report entitled, Opportunities for Risk Reduction at the Los Alamos National Laboratory Plutonium Facility through the Minimization of Material-At-Risk (DNFSB/TECH-39), for NNSA's consideration.
• August 18, 2015, Department letter informing the Board of the next steps to improve the seismic performance of the Plutonium Facility (PF-4) at the Los Alamos National Laboratory.
• 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.
• March 25, 2015, Department letter documenting NNSA’s path forward for resolution of safety basis issues at the Radioassay and Nondestructive Testing (RANT) Shipping Facility at Los Alamos National Laboratory, in response to the Board letter of December 9, 2014.
• March 11, 2015, DNFSB Twenty-Fifth Annual Report to Congress for Calendar Year 2014.
• February 13, 2015, Department letter providing an updated plan and schedule for completing the alternate seismic analysis of the Los Alamos National Laboratory Plutonium Facility in response to the Board letter of December 17, 2014.

• December 17, 2014, Board letter establishing a 30-day reporting requirement for an updated plan and schedule for completing the alternate seismic analysis of the Los Alamos National Laboratory Plutonium Facility.
• December 10, 2014, National Nuclear Security Administration memorandum approving the site performance culture sustainment plans per Action 2-13 of the Implementation Plan for Recommendation 2011-1, Safety Culture at the Waste Treatment and Immobilization Plant.
• December 9, 2014, Board letter establishing a 90-day reporting requirement for NNSA’s path forward for resolution of safety basis issues at the Radioassay and Nondestructive Testing (RANT) Shipping Facility at Los Alamos National Laboratory.
• October 3, 2014, Department letter transmitting deliverables from the National Nuclear Security Administration for Action 2-10 and 2-12 of the Implementation Plan for Recommendation 2011-1, Safety Culture at the Waste Treatment and Immobilization Plant.
• 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 16, 2014, Department letter responding to the Board letter of August 7, 2014, concerning the current safety challenges at the National Nuclear Security Administration's defense nuclear facilities.
• September 5, 2014, Department letter providing the current plans for resumption of operations at the Plutonium Facility (PF-4) at Los Alamos National Laboratory.
• August 7, 2014, Board letter providing a summary of the current challenges NNSA faces in the area of safety at NNSA’s defense nuclear facilities.
• August 7, 2014, Board letter establishing a 60-day reporting requirement for a briefing on actions taken or planned by NNSA to resolve safety issues for the Transuranic Waste Facility project at Los Alamos National Laboratory.
• July 9, 2014, Department letter transmitting the FY2013 Annual Report on Nuclear Criticality Safety.
• June 6, 2014, FY2013 Annual Report to Congress on DOE's activities relating to the Defense Nuclear Facilities Safety Board.
• May 20, 2014, Board letter recognizing Mr. Christopher D. Fischahs of the Los Alamos Field Office as the winner of the 2013 Department of Energy Annual Safety System Oversight Award.
• May 16, 2014, Board letter establishing a 14-day reporting requirement for a briefing on how NNSA will ensure that adequate controls will be identified as the Los Alamos National Laboratory resumes higher-risk operations at PF-4.
• March 6, 2014, DNFSB Twenty-Fourth Annual Report to Congress for Calendar Year 2013.

• December 6, 2013, Department letter providing follow-up information regarding the pause in programmatic operations at the LANL Plutonium Facility as a precautionary measure due to concerns with the criticality safety program.
• September 6, 2013, FY2012 Annual Report to Congress on DOE's activities relating to the Defense Nuclear Facilities Safety Board.
• September 3, 2013, Department letter responding to the Board letter of July 17, 2013, and providing a schedule outlining the path to complete the alternate analysis for a seismic collapse scenario at the Los Alamos National Laboratory Plutonium Facility.
• August 15, 2013, Department letter in response to the Board letter of July 15, 2013, regarding criticality safety concerns stemming from weaknesses in conduct of operations at the Plutonium Facility at Los Alamos National Laboratory.
• July 17, 2013, Board letter establishing a 45-day reporting requirement for a schedule outlining the path to complete the alternate analysis for a seismic collapse scenario at the Los Alamos National Laboratory Plutonium Facility.
• July 15, 2013, Board letter establishing a 30-day reporting requirement regarding criticality safety concerns stemming from weaknesses in conduct of operations at the Plutonium Facility at Los Alamos National Laboratory.
• March 27, 2013, Department letter in response to the Board’s letter of January 3, 2013, concerning DOE senior leadership’s assessment of the current state of public and worker protection for seismic accident scenarios, and the risk reduction measures to be applied to mitigate near term seismic risks of the Plutonium Facility (PF-4) at Los Alamos National Laboratory.
• 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.
• January 16, 2013, Department letter responding to the Board letter of November 19, 2012, concerning the nuclear facility safety basis for Area G at Los Alamos National Laboratory.
• January 3, 2013, Board letter establishing a 60-day reporting requirement for DOE senior leadership’s assessment of the current state of public and worker protection for seismic accident scenarios, and the risk reduction measures to be applied to mitigate near term seismic risks of the Plutonium Facility (PF-4) at Los Alamos National Laboratory.

• December 12, 2012, Department letter providing an revise of Action 2-6 in the Department of Energy's Implementation Plan for Defense Nuclear Facilities Safety Board Recommendation 2011-1, Safety Culture at the Waste Treatment and Immobilization Plant.
• November 19, 2012, Board letter establisbing a 60-day reporting requirement for DOE’s plans to address issues regarding approved safety basis for Area G at Los Alamos National Laboratory.
• November 5, 2012, Department letter in response to Board letter of June 18, 2012, regarding the safety basis for the Plutonium Facility at Los Alamos National Laboratory.
• October 9, 2012, Department letter detailing actions taken or planned by the National Nuclear Security Administration to resolve safety issues relating to the Transuranic Waste Facility project preliminary design at Los Alamos National Laboratory, in response to the Board letter of June 11, 2012.
• September 28, 2012, Department letter responding to the Board letter of July 18, 2012, regarding seismic analysis of the Plutonium Facility at Los Alamos National Laboratory.
• September 6, 2012, Department letter requesting an additional 60-day extension to respond to Board letter of June 18, 2012, concerning the approved safety basis for the Plutonium Facility (PF-4) at Los Alamos National Laboratory. This letter also indicates that NNSA will provide a revised project execution plan for seismically-related upgrades to PF-4 within 90 days of completion of the final report for the current scope of non-linear static seismic analyses.
• August 14, 2012, Department letter indicating that the detailed response to the Board's letter of July 18, 2012, regarding the seismic structural analysis for the Plutonium Facility at Los Alamos National Laboratory, will be provided by September 28, 2012.
• July 31, 2012, Department letter requesting a 60-day extension to respond to Board letter of June 11, 2012, regarding actions taken or planned by the National Nuclear Security Administration to resolve safety issues relating to the Transuranic Waste Facility (TWF) project at Los Alamos National Laboratory.
• July 18, 2012, Board letter establishing a 30-day reporting requirement regarding the seismic structural analysis for the Plutonium Facility at Los Alamos National Laboratory.
• July 13, 2012, Department letter requesting a 45-day extension to respond to Board letter of June 18, 2012, concerning the approved safety basis for the Plutonium Facility at Los Alamos National Laboratory.
• 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 18, 2012, Board letter establising a 30-day reporting requirement regarding the approved safety basis for the Plutonium Facility at Los Alamos National Laboratory.
• June 11, 2012, Board letter establishing 60-day reporting requirement for identification of actions taken or planned by the National Nuclear Security Administration to resolve safety issues relating to the Transuranic Waste Facility (TWF) project at Los Alamos National Laboratory.
• June 8, 2012, FY2011 Annual Report to Congress on DOE's activities relating to the Defense Nuclear Facilities Safety Board.
• March 20, 2012, Department letter informing the Board of the completion of deliverable 5.4.4 of the Implementation Plan for Recommendation 2009-2, Los Alamos National Laboratory Plutonium Facility Seismic Safety.
• 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.
• February 28, 2012, Department letter transmitting the Annual Report on Nuclear Criticality Safety for Fiscal Year 2011.
• February 17, 2012, DNFSB Twenty-Second Annual Report to Congress for Calendar Year 2011.
• January 30, 2012, Department letter detailing the technical basis, actions taken to improve safety, and plans for safety improvements to continuously ensure adequate protection of public safety from operations at the Los Alamos National Laboratory's Plutonium Facility (PF-4).

• November 18, 2011, Department letter informing the Board about the disposition of a set of proposals relating to the Chemistry and Metallurgy Research Building Replacement (CMRR) Project at the Los Alamos National Laboratory (LANL)
• November 15, 2011, Department letter informing the Board of completion of Commitment 5.2.3, and updating the completion date for Commitment 5.4.4 of the Implementation Plan for Recommendation 2009-2, Los Alamos National Laboratory Plutonium Facility (PF-4) Seismic Safety
• October 5, 2011, Department letter updating the plans for addressing verification/validation and root cause analysis relating to the System for Analysis of Soil-Structure Interaction (SASSI).
• September 29, 2011, Department letter transmitting deliverable 5.4.5, and requesting due date extensions for deliverables 5.2.3 and 5.4.4 of the Implementation Plan for Recommendation 2009-2, Los Alamos National Laboratory (LANL) Plutonium Facility (PF-4) Seismic Safety.
• 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.
• August 29, 2011, FY2010 Annual Report to Congress on DOE's activities relating to the Defense Nuclear Facilities Safety Board.
• July 20, 2011, Department letter requesting 60-day extension to complete Implementation Plan deliverables 5.2.3 and 5.4.4 of Recommendation 2009-2, Los Alamos National Laboratory Plutonium Facility Seismic Safety
• June 28, 2011, Department letter forwarding deliverables 5.2.2 and 5.3.2 of the Implementation Plan for Recommendation 2009-2, Los Alamos National Laboratory Plutonium Facility Seismic Safety.
• 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 8, 2011, Department letter requesting 30-day extension on two Recommendation 2009-2, Los Alamos National Laboratory Plutonium Facility Seismic Safety, Implementation Plan deliverables.
• April 8, 2011, Board letter establishing a 45-day reporting requirement on issues related to the SASSI computer software code.
• April 5, 2011, Board letter establishing a 90-day reporting requirement for a report on actions taken to completely implement Standard DOE-NA-STD-3016-2006, Hazard Analysis Reports for Nuclear Explosive Operations.
• April 1, 2011, Department letter transmitting Deliverable 5.4.2 for the Implementation Plan for Board Recommendation 2009-2, Los Alamos National Laboratory Plutonium Facility Seismic Safety.
• March 15, 2011, Department letter transmitting the DOE Annual Report on Nuclear Criticality Safety for calendar year 2010.
• February 8, 2011, Board letter establishing a 30-day reporting requirement for a briefing to discuss NNSA's decision process, timing, and bases for changes related to Board concerns resolved under the CMRR certification process at LANL.
• February 8, 2011, DNFSB Twenty-First Annual Report to Congress for Calendar Year 2010.
• January 31, 2011, Department letter transmitting Deliverable 5.4.1 for the Implementation Plan for Board Recommendation 2009-2, Los Alamos National Laboratory Plutonium Facility Seismic Safety to the Board.

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