Valar Watch · Claims vs Record disc-006

Claims vs Record disc-006

unresolvedtechnical How big is Ward 250? 100 kW day to day; 250 kW for one hour per run (safety paper) or 'up to one day', possibly a total (unfinished Valar page); '5 MW' in airlift news

disc-006

What was said

Isaiah Taylor (Valar's unlisted 'Ward 250 By the Numbers' page, which still carries placeholders) (2026-06-28): The reactor is "licensed for 30 Effective Full Power Days at 100kWt" and "up to one day at 250kWt".
Ward 250 By the Numbers (Isaiah Taylor; unlisted page that still carries placeholders) (Valar Atomics, 2026-06-28)
U.S. Department of Energy (environmental review) (2026-04-22): "Ward250 is a 250 kilowatt thermal (kWth)" reactor.
NEPA Determination DOE-ID-26-005: Valar Ward250 Research Reactor (categorical exclusion B5.26) (U.S. Department of Energy, Office of Nuclear Energy, 2026-04-22)
Valar Atomics (web summary of the safety agreement) (2025-10-13): "a 250 kWth High Temperature Gas-cooled Research Reactor".
Ward250 Nuclear Safety Design Agreement (web summary; not listed in Valar's library) (Valar Atomics, 2025-10-13)
Stars and Stripes (airlift coverage; figure not attributed to Valar or DOE) (2026-02-17): A "5 megawatt nuclear reactor" able to power about 5,000 homes.
Air Force C-17 Globemaster III aircraft airlift nuclear reactor in a first-of-its-kind mission (Stars and Stripes, 2026-02-17)
World Nuclear News (airlift coverage; figure not attributed) (2026-02-18): "The 5 MW Ward250 reactor".
US microreactor transported by air (World Nuclear News, 2026-02-18)
ExecutiveGov (airlift coverage; headline) (2026-02-18): A "5-Megawatt Nuclear Reactor".
DOW, DOE Partner With Valar Atomics for Transport of 5-Megawatt Nuclear Reactor to Utah (ExecutiveGov, 2026-02-18)

What the record shows

Safety limits (page 25): 'Maximum continuous power: 100 kWth' and 'Maximum short duration power (1hr): 250 kWth'. The limit reads as per run; one continuous day would be 24 times it, but the Valar page does not say whether its day is continuous or a total.
Ward250 Nuclear Safety Design Agreement, No. 100403, Rev 02 (status: Draft), page 25 (Valar Atomics, 2025-10)
Table 6: 100 kWth continuous, basis 'License limit'; up to 250 kWth for 'Limited tests'.
Ward250 Nuclear Safety Design Agreement, No. 100403, Rev 02 (status: Draft), Table 6, page 52 (Valar Atomics, 2025-10)
ANS reports Taylor 'has indicated the Ward 250 is a 100-kWt reactor'.
Valar's Ward 250 reaches criticality in Utah (American Nuclear Society, Nuclear Newswire, 2026-06-22)
POWER calls it 'rated at 100 kWt initial test power and scalable to 5 MWe'.
Valar Atomic's Ward 250 Becomes Second Reactor to Go Critical Under DOE Pilot Program (POWER Magazine, 2026-06-19)
The state lab's page says the design is meant to 'scale up to a 5 MW design'.
Valar Atomics (project page) (Utah San Rafael Energy Lab (State of Utah, Office of Energy Development))
Ward 250 has no NRC license; the safety agreement says it operates under DOE authorization with no transition to NRC licensing planned. 'Licensed' is Valar's word for a DOE authorization.
Ward250 Nuclear Safety Design Agreement, No. 100403, Rev 02 (status: Draft), page 2 (Valar Atomics, 2025-10)
The safety agreement itself calls Ward 250 'a ≤250 kWth' reactor, so DOE's '250 kilowatt thermal' description matches the paper's own maximum rating; it is not a contradiction.
Ward250 Nuclear Safety Design Agreement, No. 100403, Rev 02 (status: Draft), page 2 (executive summary) (Valar Atomics, 2025-10)
At the Price City Council on 24 June, Valar's Cory Gardner described full power as 'its full 100-kilowatt limit' (ETV's paraphrase): Valar's staff used the 100 kW continuous limit as 'full power'.
Price City Council celebrates Valar Atomics reaching full power ahead of schedule (Stephanie Olsen) (ETV News, 2026-06-25)
ExecutiveGov reports the loading as a Department of War statement ('DOW said Sunday that it loaded the Ward 250 nuclear reactor'), in a sentence that describes the reactor as able to power about 5,000 homes. Stars and Stripes, which gives the same 5 MW and 5,000-home figures, cites 'a Pentagon news release' in the same passage. The 5 MW framing thus appears, as reported, to come from the airlift's federal publicity; the Pentagon article both outlets link refused our reader (see sources not read).
DOW, DOE Partner With Valar Atomics for Transport of 5-Megawatt Nuclear Reactor to Utah (ExecutiveGov, 2026-02-18)
The 'one day at 250kWt' figure appears only on 'Ward 250 By the Numbers', a page that is unlisted in Valar's library and still carries placeholders ('made power on July XX'), so it reads as an unfinished draft (orig-035).
Ward 250 By the Numbers (Isaiah Taylor; unlisted page that still carries placeholders) (Valar Atomics, 2026-06-28)

The gap: The safety paper allows 250 kW for one hour per run; an unfinished, unlisted Valar page from June 2026 says up to one day. Read as a total across runs, the two can fit; read as one continuous day, it is 24 times the paper's limit. Neither says which, and the approved limits are not public. The difference could reflect limits set when DOE approved the final safety analysis in 2026, or an error in a draft page. DOE's description of a '250 kilowatt thermal (kWth)' reactor matches the paper's own '≤250 kWth' rating and is not a conflict, and Valar staff called the 100 kW limit 'full power'. The '5 MW' in airlift coverage appears, as reported, to come from the airlift's federal publicity and the design's planned future size, not from Valar's own words.

In plain termsA reactor's 'size' can mean what it runs at day to day or the most it may reach in a short test. Ward 250's safety paper says 100 kilowatts of heat day to day and 250 kilowatts for no more than an hour per run, and calls it a reactor of 'up to 250' kilowatts; that is why DOE calls it a 250-kilowatt reactor, and why Valar staff call 100 kilowatts 'full power.' Those fit together. Two things may not. An unfinished Valar web page says 250 kilowatts is allowed for up to a day; read as a total across runs, that can fit, but read as one continuous day, it is 24 times the paper's limit. And airlift news called it 5 megawatts, a figure that appears to come from the military's publicity and from the size the design is meant to grow to. The limits DOE actually approved would settle the hour-or-day question; they are not public.

Why it matters: Power and time at power set how much heat and radioactivity the reactor makes; the limits DOE actually approved are not public, and the company's unfinished page and its safety paper give different figures that may or may not conflict.

What would settle it: FOIA to DOE Idaho Operations Office for the Technical Safety Requirements, any approval to exceed 100 kWth, and the Ward 250 operating logs; ask Valar to publish the authorized limits.

facts safe-008, orig-031, orig-035, orig-011, gov-027, orig-030, safe-001 · checked 2026-09-29: Defence pass 2026-09-29: Defended: NSDA exec summary ('≤250 kWth') explains DOE's 250 kWth; ETV Price council (Gardner: 'full 100-kilowatt limit'); ExecutiveGov attributes the 5,000-homes description to 'DOW', and Stripes cites a Pentagon release (war.gov article linked from both refused our reader: robots.txt and page answer 403). The one-day claim is on an unfinished, unlisted draft page. Moved to unresolved: the only surviving difference (hour vs day) has a plausible reading (later-approved limits) that only the non-public TSRs can settle. Summary line literally true (NSDA p. 25; the draft page is online). | Earlier verify pass: Re-read on 2026-09-29: By the Numbers (quotes exact), CX p. 1, NSDA web summary, NSDA pp. 2, 25, 52, ANS, POWER, WNN, Stars and Stripes, ExecutiveGov, Utah lab page. The 5 MW figure in the airlift articles is not attributed to Valar or DOE in the text read; it is recorded as press wording. | Correction 2026-09-29 (calculation audit): gap, plain and summary line now read the paper's hour as per run and the page's day as possibly a total (24 times only if continuous). | Correction 2026-09-29 (wording review): source title parenthetical now 'not listed in Valar's library'; framed as a difference that may or may not be a conflict (per-run hour vs possibly cumulative day); verification wording updated ('summary line').