Poland Poland · Otwock · 52.117, 21.267

PANNA

PANNA, a research reactor (critical assembly) in Otwock, Poland, with 100 W of thermal power, operated by Institute of Nuclear Research. Decommissioned, first critical in 1963.

It was one of the 6 research reactors Poland has had; 1 remains in operation today. It went critical 5 years after the first research reactor in Poland, EWA (1958). 44 critical assemblies remain in operation today across 12 countries. Its declared uses include nuclear data measurements and materials testing.

Country
Poland
City
Otwock
Type
Critical assembly
Thermal power
100 W
Operator
Institute of Nuclear Research
Status
Decommissioned
First criticality
1963
Purpose
Nuclear data, materials testing

Data: IAEA RRDB · updated on Sep 3, 2026

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