Nuclear Risk Watch · Facility Report
Higashidōri Nuclear Power Plant
Japan · Tohoku Electric Power · nuclear power plant · operational · 1,100 MW installed
41.188, 141.390 · generated 2026-11-12 20:25:11 UTC
Current external hazard exposure
LOW · 3.8/100
Earthquake 209 km from Higashidōri Nuclear Power Plant, 13 h ago (severity 16%, distance factor 0.25, recency 0.88) plus 1 other active hazard → exposure LOW (3.8/100).
Baseline: this exposure is at or above 34% of the 398 observations recorded for this facility since 2026-08-14 · highest recorded 15.6/100.
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 M4.8 | USGS | 2026-11-12 04:07 | 209 km |
| EARTHQUAKE M4.7 | USGS | 2026-11-08 09:23 | 233 km |
Recent exposure history
- 2026-11-12 17:03 · LOW 3.8
- 2026-11-12 15:04 · LOW 3.9
- 2026-11-12 10:03 · LOW 4.1
- 2026-11-12 05:02 · LOW 4.3
- 2026-11-12 04:03 · LOW 1.2
- 2026-11-11 12:03 · LOW 1.4
- 2026-11-11 05:02 · LOW 1.5
- 2026-11-10 17:04 · LOW 1.7
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