Claims vs Record disc-008
unresolvedsafety The accident math assumes the public stays 400 m away; the lab is 20.6 acres, and officials called the fence buffer enough
What was said
- Valar Atomics (safety agreement, pages 10, 11 and 39) (2025-10): Treats the site boundary at 400 m as "the nearest point of public access" (a "Remote site location") and concludes: "The 400m site boundary provides adequate protection with substantial margin."Ward250 Nuclear Safety Design Agreement, No. 100403, Rev 02 (status: Draft), pages 10, 11 and 39 (Valar Atomics, 2025-10)
- A speaker at Emery County's 7 April 2026 land-sale hearing, as ETV News reported it (ETV does not name who) (2026-04-07): When residents asked about a buffer zone, the reply was that "with these small reactors the fence line is all the buffer zone needed"; two commissioners "concurred with Valar".Emery Commission public hearing receives comments on the sale of property to Valar Atomics (ETV News, 2026-04-09)
- Jaron Wallace, director of the state-run Utah San Rafael Energy Lab, as ETV News reported it (2025-10-10): Valar must prove that under the worst conditions no damage or radiation can pass the fence line of its 11 acres.What's actually happening at the Utah San Rafael Energy Lab? (Susanna Watts) (ETV News, 2025-10-10)
What the record shows
- DOE's environmental review: the host lab is 'a 20.6-acre site'; Ward 250 occupies about 2 acres inside a security fence; 'No expansion of site boundaries occurs.' The same review says 'Radiation monitoring and controlled access are maintained during operations', without saying where the controlled area ends.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)
- A 400 m circle covers about 124 acres (3.1416 x 400 m x 400 m = 502,655 square meters), six times the whole lab; so the 400 m boundary runs over land outside it. No record read says who controls public access to that land.Ward250 Nuclear Safety Design Agreement, No. 100403, Rev 02 (status: Draft), page 10 (Valar Atomics, 2025-10)
- The safety agreement's own dispersion factors: the one used at 100 m (4.0e-3 s/m3) is 16 times the one at 400 m (2.5e-4 s/m3), and its worst-case dose at 100 m is under 5 rem. Our check: the 100 m factor meets DOE's default, but the 400 m factor is 3.1 to 12.3 times lower than standard rural methods give for the paper's own stated weather (Class F, 1 m/s).Ward250 Nuclear Safety Design Agreement, No. 100403, Rev 02 (status: Draft), pages 36-37 (Valar Atomics, 2025-10)
- The county's own minutes of the same April hearing record the answer to the buffer-zone question as 'every design has to be reviewed and approved by the Department of Energy', and the lab director saying 'the State is interested in contiguous ownership to maintain safety'. The county then approved selling the 112-acre parcel beside the lab to Valar (closing not confirmed in the records read).Emery County Commission Meeting Minutes, April 7, 2026 (public hearing on sale of parcel 04-0019-0030) (Emery County Commission (Utah Public Notice Website), 2026-04-07)
The gap: The worst-case analysis in Valar's draft paper assumes no member of the public is closer than 400 m, which it calls 'the nearest point of public access'; no DOE document read sets 400 m as a required boundary, and DOE's approved analysis may use a different one. The reactor's fence encloses about 2 acres of a 20.6-acre state lab, far less than the roughly 124 acres a 400 m circle covers. An access-control agreement, state control of surrounding land, or Valar's purchase of the adjacent 112 acres (which the lab director linked to 'contiguous ownership to maintain safety') may cover the difference; no record read shows any of them in place. Local officials, as reported, told residents the fence line is buffer enough.
In plain termsIn an accident, distance is protection: the farther away people are, the smaller the dose. Valar's worst-case math places the nearest member of the public 400 meters from the reactor. A circle that size covers about 124 acres, but the state lab the reactor sits on is 20.6 acres, and the reactor's fenced area about 2. So the math assumes the public is kept off land outside the lab, and no public record says who does that. Residents who asked about a buffer zone were told, as the local paper reported, that the fence is buffer enough. The land may be controlled by an agreement, or covered by the land next door that Valar is buying; the records read do not say.
Why it matters: If people can stand closer than 400 m, the paper's own numbers show the air concentration, and so the dose, rises steeply (16 times at 100 m).
What would settle it: The site description and public-access control in the approved DSA (FOIA to DOE Idaho Operations Office); GRAMA to the Utah Office of Energy Development for the USREL site plan, Valar's use agreement and any access-control agreements; the Emery County Recorder's deed for parcel 04-0019-0030.