Nuclear Risk Watch · Facility Report
Ōma Nuclear Power Plant
Japan · Electric Power Development Company · nuclear power plant · under construction · 1,383 MW installed
41.510, 140.910 · generated 2026-09-12 06:11:44 UTC
Current external hazard exposure
LOW · 1.2/100
Earthquake 193 km from Ōma Nuclear Power Plant, 6 d ago (severity 18%, distance factor 0.28, recency 0.25) → exposure LOW (1.2/100).
Baseline: this exposure is at or above 3% of the 682 observations recorded for this facility since 2026-06-14 · highest recorded 26.4/100.
Facility impact: no operational effect has been confirmed in the public sources reviewed.Exposure measures external hazard conditions near the site; it is not an assessment of plant engineering safety.
Nearby active hazards (in range)
| Type | Source | When (UTC) | Distance |
|---|---|---|---|
| EARTHQUAKE M4.9 | USGS | 2026-09-06 05:15 | 193 km |
Recent exposure history
- 2026-09-12 05:01 · LOW 1.2
- 2026-09-11 23:01 · LOW 1.4
- 2026-09-11 16:01 · LOW 1.5
- 2026-09-11 03:01 · LOW 1.7
- 2026-09-10 16:01 · LOW 1.9
- 2026-09-10 11:01 · LOW 2.0
- 2026-09-10 06:01 · LOW 2.1
- 2026-09-09 20:01 · LOW 2.3
How this score is calculated
External hazard exposure (0–100) combines four factors: hazard type, severity, proximity to the site and recency — higher when a serious hazard is close and recent. It does not incorporate facility vulnerability or consequence. Full methodology.
LOW 0–20MODERATE 20–40ELEVATED 40–60HIGH 60–80SEVERE 80–100