Japan · Oarai · 36.268, 140.554

JOYO

JOYO, a research reactor (fast) in Oarai, Japan, with 100 MW of thermal power, operated by Oarai Nuclear Engineering Institute. Temporary shutdown, first critical in 1977.

It is the most powerful research reactor in Japan, of the 9 currently operating. It went critical 20 years after the first research reactor in Japan, JRR-1 (1957). It is one of 15 fast research reactors operating worldwide, spread across 6 countries. Its declared uses include teaching, training and materials testing.

Country

Japan

City

Oarai

Type

Fast

Thermal power

100 MW

Operator

Oarai Nuclear Engineering Institute

Status

Temporary shutdown

First criticality

1977

Purpose

Teaching, training, materials testing

See also: every research reactor in Japan · How research reactors work