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France France · Gif-sur-Yvette · 48.702, 2.134

Isis

Isis, a research reactor (pool) in Gif-sur-Yvette, France, with 700 kW of thermal power, operated by CEA Saclay. Shut down, first critical in 1966.

It was one of the 38 research reactors France has had; 2 remain in operation today. It went critical 18 years after the first research reactor in France, ZOE (EL-1) (1948). 48 pool-type reactors remain in operation today across 28 countries. Its declared uses include teaching and training.

Country
France
City
Gif-sur-Yvette
Type
Pool
Thermal power
700 kW
Operator
CEA Saclay
Status
Shut down
First criticality
1966
Purpose
Teaching, training

Data: IAEA RRDB · updated on Sep 3, 2026

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