Valar Watch · Fact safe-019

Fact safe-019

newrecordconfirmed Who decides day to day: Valar's own design authority, with DOE approval only for changes that cross the safety basis

2025-10 · safe-019 · Valar Atomics, U.S. Department of Energy, Mark Mitchell

The NSDA makes Valar the Design Authority for Ward 250, with the COO/Chief Nuclear Officer holding 'ultimate contractor responsibility for design safety decisions' (Valar's mission page lists Mark Mitchell as Chief Nuclear Officer, orig-003). Changes are screened by Valar's own Unreviewed Safety Question (USQ) process under 10 CFR 830.203; DOE's prior approval is needed only for changes to safety-basis assumptions, TSR limits, safety equipment functions or approved codes. Otherwise 'Design decisions within the approved authorization basis are made by Valar Atomics' Design Authority'. DOE-STD-1271 sets the same division: the OTA contractor is the Design Authority, final design adequacy is approved through the DSA, and after startup testing the contractor operates without asking permission for approved activities. The NSDA planned a Joint Test Group, required by the standard, as a TSR for post-startup testing; Valar's draft post dated 28 June 2026 says the company had 'graduated' from the Joint Test Group; the post says it has been 14 days since first criticality and that Valar made power on July XX, so it reads as drafted about 2 July under an earlier 28 June date field; the count fits DOE's 18 June date (disc-040). DOE's record of ending Joint Test Group oversight is not public.

In plain termsThe company is its own day-to-day safety judge. It decides whether a change needs DOE's permission by running its own screening process, and only changes that affect the approved safety case go to DOE. DOE's representative sat on the start-up test group, which the company says it had left within about two weeks of first starting the reactor. This is how DOE's system is designed; the public cannot see the screening decisions or when DOE signed off.

Ward250 Nuclear Safety Design Agreement, No. 100403, Rev 02 (status: Draft; issued for Public Release) (Valar Atomics, 2025-10) primary company “Design decisions within the approved authorization basis are made by Valar Atomics' Design Authority”
Ward250 Nuclear Safety Design Agreement, No. 100403, Rev 02 (status: Draft; issued for Public Release) (Valar Atomics, 2025-10) primary company “will be implemented as a TSR for post-startup testing activities”
Ward 250 By the Numbers (unlisted company page with placeholders, signed Isaiah Taylor) (Valar Atomics (Isaiah Taylor), 2026-06-28) primary company “we have now graduated from the Joint Test Group”
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
Ward 250 By the Numbers (unlisted company page with placeholders, signed Isaiah Taylor) (Valar Atomics (Isaiah Taylor), 2026-06-28) primary company “it’s been 14 days since we first went critical”

verified 2026-09-29: Re-read NSDA pp. 30-31, 'By the Numbers', DOE release (18 June) and DOE-STD-1271 secs. 3, 9 on 2026-09-29. Holds. New small discrepancy recorded: Valar's 28 June post counts 14 days since first criticality; DOE and Valar's Castle Country page give 18 June (10 days). Synthesis consistency check 2026-09-29: plan-005 and disc-040 read the '14 days' as coming from an unfinished draft whose 28 June date may not be when the words were written (18 June plus 14 days is 2 July); every dated DOE and Valar record gives 18 June. The mismatch stays unexplained by any record, but it rests on the draft alone. Correction 2026-09-29 (calculation audit): 14-day count now explained (draft written about 2 July; fits 18 June), replacing 'unexplained mismatch'.

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