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

Alecto

Alecto, a research reactor (homogeneous) in Gif-sur-Yvette, France, with 1 W of thermal power, operated by CEA Saclay. Decommissioned, first critical in 1961.

It was one of the 38 research reactors France has had; 2 remain in operation today. It went critical 13 years after the first research reactor in France, ZOE (EL-1) (1948). 15 homogeneous reactors remain in operation today across 6 countries. Its declared uses include nuclear data measurements.

Country
France
City
Gif-sur-Yvette
Type
Homogeneous
Thermal power
1 W
Operator
CEA Saclay
Status
Decommissioned
First criticality
1961
Purpose
Nuclear data

Data: IAEA RRDB · updated on Sep 3, 2026

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