What DOE has made public about Ward 250 safety, and what was not found: no DSA, TSRs, SER or startup approval, though DOE says its teams reviewed Ward 250's readiness before startup

Public DOE records found for Ward 250 as of late September 2026: the categorical exclusion DOE-ID-26-005 (signed 22 April 2026, posted with a June 2026 web path; csite-020); DOE's 18 June 2026 criticality release; and two DOE Packaging Certification Program documents on rampac.energy.gov (the Model 9979 fuel-shipment Safety Evaluation Report of 20 May 2026 and Valar's transport QA approval of 18 May 2026; safe-010). Found on 30 September: the Office of Environmental Management's article of 14 July 2026, which says EM staff took part in DOE's readiness review for the four pilot reactors, naming Ward 250, and in reviewing contractor submittals for advanced microreactor designs, a sentence that does not name Ward 250 (dir-031). Not found on DOE's public sites: the NSDA approval letter, the PDSA and final DSA, the Technical Safety Requirements, DOE's Safety Evaluation Report on the DSA (which DOE-STD-1271 says the approval authority approves), the readiness-review report, the startup approval (signed by the Secretary of Energy or a delegate under the standard), any approval to exceed 100 kWth, and the DOE-Valar Other Transaction Agreement. The NSDA also refers to a Code of Record (document 100437, which it says was provided to DOE with the NSDA) and to a Physical Security Plan and a Material Control and Accountability Plan, which it calls separate controlled documents. The contents of the Idaho Operations Office's document server (id.energy.gov) were not checked. No requirement that DOE or Valar post these documents publicly was found in DOE-STD-1271 or the NSDA. An absent posting is not proof a document is being withheld; it is what a FOIA request to the Idaho Operations Office would settle.

• NEPA Determination DOE-ID-26-005: Valar Ward250 Research Reactor (categorical exclusion B5.26) (U.S. Department of Energy, Office of Nuclear Energy (Idaho), 2026-04-22) primary government
• Department of Energy Celebrates Second Advanced Reactor Achieving Criticality (U.S. Department of Energy, 2026-06-18) primary government
• Safety Evaluation Report, Letter Amendment of Certificate of Compliance No. 9979 for the Model 9979 Package, Docket 26-35-9979 (U.S. Department of Energy, Office of Packaging and Transportation (Packaging Certification Program), 2026-05-20) primary government
• DOE-STD-1271-2025, Authorization Pathway for Nuclear Facilities (August 2025; DOE standard, copy posted by the Nuclear Innovation Alliance) (U.S. Department of Energy, Office of Nuclear Energy, 2025-08) primary government “A Safety Evaluation Report will be prepared using the guidance of DOE-STD-1104”
• Ward250 Nuclear Safety Design Agreement, No. 100403, Rev 02 (status: Draft; issued for Public Release) (Valar Atomics, 2025-10) primary company
• EM Specialists Help DOE Achieve Criticality Milestones for Advanced Reactors (U.S. Department of Energy) primary government “took part in DOE’s readiness review process for facility startup”