Provenance Record

Well-structured News piece (872 words, within the 400-1200 News range). Clear Overview/What We Know/Federal Backdrop/What We Don't Know/Analysis arc. Technical claims (water-column hydrostatic pressure replacing surface pressure vessels, geological containment, modular scaling) are explained accessibly and accurately, and the 'What We Don't Know' section honestly flags the absence of a construction schedule and the unproven nature of the borehole approach at commercial scale.

All 5 source snapshots read from disk and verified (all status 200, no failed snapshots, so no claim rests on an un-snapshotted source). source-0 (World Nuclear News, partnerships): CONFIRMED Day & Zimmermann's pre-construction/above-ground role for the Gravity reactor; McConnell quote verbatim ('Deep Fission's advanced reactor technology, combined with Day & Zimmermann's quality programme and nuclear expertise, will bring first-of-a-kind nuclear construction to reality' — attributed correctly to Ross McConnell, D&Z Chief Nuclear Officer); Brasel quote verbatim ('Partnering with Day & Zimmermann will bring proven nuclear construction expertise and execution discipline to Deep Fission's deployment' — Mike Brasel, COO); 100 reactors = 1.5 GWe. source-1 (Interesting Engineering): CONFIRMED Great Plains Industrial Park / Parsons KS, first of three planned data-acquisition wells, one-mile depth, 160 atmospheres of hydrostatic pressure from the water column eliminating surface pressure vessels, bedrock geological containment + radiation shielding, DOE Reactor Pilot Program 'one of ten program participants', up to 100 units co-located. source-2 (World Nuclear News, DOE selections): CONFIRMED 'Deep Fission Borehole Reactor-1 is a 15 MWe pressurised water reactor', initial selection of 11 advanced reactor projects, Deep Fission Inc named, goal to 'construct, operate, and achieve criticality of at least three test reactors using the DOE authorisation process by July 4, 2026'. source-3 (deepfission.com, OFF-ALLOWLIST): CONFIRMED both Liz Muller quotes verbatim and her title (CEO and Co-Founder of Deep Fission); article re-orders the two sentences from the single source quote but reproduces each verbatim with correct attribution — acceptable, not a misattribution. source-4 (powermag.com, OFF-ALLOWLIST): CONFIRMED Antares Mark-0 achieved zero-power criticality at INL's Reactor and Critical Experiment (RACE) facility, becoming the first advanced reactor to reach that milestone under the DOE Reactor Pilot Program. Both off-allowlist sources are reputable (POWER Magazine is a long-established trade journal; deepfission.com is the company's own primary statement, attributed as such) and back only secondary/quote material — no headline, summary, or lead claim rests solely on an off-allowlist source.

Every specific traces to a cited, snapshot-verified source: 15 MWe, 'Deep Fission Borehole Reactor-1', 160 atmospheres, one-mile depth, Great Plains Industrial Park (Parsons KS), three data-acquisition wells, DOE Reactor Pilot Program (11 projects / 10 companies, July 4 2026 criticality goal), and the Antares Mark-0 context. No hallucinated specifics or fabricated quotes detected. The article correctly distinguishes the WNN framing ('11 projects', with Oklo selected for two) from the IE framing ('one of ten program participants') by attributing each phrasing to its respective source.

High-quality, accurate, neutral News submission. Integrity checks all pass (hash + ed25519 signature valid). Every direct quote (McConnell, Brasel, Muller) is verbatim and correctly attributed, and every numeric/named specific traces to a snapshot-verified source. The sole issue is allowlist coverage on two secondary sources, which the corrections mechanism honestly discloses. Verdict: APPROVE_WITH_CORRECTIONS.