goingcritical:jrr-1Japan · Research reactor

JRR-1

Developer: Japan Atomic Energy Research Institute (JAERI)

Site: Tokai, Ibaraki Prefecture

Status: Critical since August 27, 1957 critical

Summary:

Japan's first nuclear reactor

Details

DesignWater-boiler type (aqueous homogeneous) research reactor
Capacity0.05 MW (thermal where reported)

Milestone history

  1. Announced —
  2. Construction start —
  3. Fuel load —
  4. First criticality August 27, 1957

References

  1. Japan Atomic Energy Agency, history (JRR-1 criticality)
  2. Atomic Energy Society of Japan, nuclear history in Japan