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France France · Saint-Paul-les-Durance · 43.688, 5.708

Cesar

Cesar, a research reactor (critical assembly) in Saint-Paul-les-Durance, France, with 10 kW of thermal power, operated by CEN Cadarache. Decommissioned, first critical in 1964.

It was one of the 38 research reactors France has had; 2 remain in operation today. It went critical 16 years after the first research reactor in France, ZOE (EL-1) (1948). 44 critical assemblies remain in operation today across 12 countries.

Country
France
City
Saint-Paul-les-Durance
Type
Critical assembly
Thermal power
10 kW
Operator
CEN Cadarache
Status
Decommissioned
First criticality
1964

Data: IAEA RRDB · updated on Sep 3, 2026

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