Canada Canada · Chalk River, ON · 46.000, -77.000

PTR

PTR, a research reactor (pool) in Chalk River, ON, Canada, with 100 W of thermal power, operated by Chalk River Laboratories. Decommissioned, first critical in 1957.

It was one of the 18 research reactors Canada has had; 4 remain in operation today. It went critical 12 years after the first research reactor in Canada, ZEEP (1945). 48 pool-type reactors remain in operation today across 28 countries.

Country
Canada
City
Chalk River, ON
Type
Pool
Thermal power
100 W
Operator
Chalk River Laboratories
Status
Decommissioned
First criticality
1957

Data: IAEA RRDB · updated on Sep 3, 2026

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