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France France · Grenoble · 45.198, 5.702

Siloe

Siloe, a research reactor (pool) in Grenoble, France, with 35 MW of thermal power, operated by CEN Grenoble. Decommissioned, first critical in 1963.

It was one of the 38 research reactors France has had; 2 remain in operation today. It went critical 15 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 isotope production, transmutation and materials testing.

Country
France
City
Grenoble
Type
Pool
Thermal power
35 MW
Operator
CEN Grenoble
Status
Decommissioned
First criticality
1963
Purpose
Isotope production, transmutation, materials testing

Data: IAEA RRDB · updated on Sep 3, 2026

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