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Poland Poland · Otwock · 52.123, 21.344

MARIA

MARIA, a research reactor (pool) in Otwock, Poland, with 30 MW of thermal power, operated by Institute of Atomic Energy. Operating, first critical in 1974.

It is the only research reactor operating in Poland today; the country has shut down 5 others. It went critical 16 years after the first research reactor in Poland, EWA (1958). It is one of 48 pool-type reactors operating worldwide, spread across 28 countries. Its declared uses include isotope production, neutron scattering, neutron radiography and transmutation.

Country
Poland
City
Otwock
Type
Pool
Thermal power
30 MW
Operator
Institute of Atomic Energy
Status
Operating
First criticality
1974
Purpose
Isotope production, neutron scattering, neutron radiography, transmutation, gemstone irradiation, teaching, training, activation analysis

Data: IAEA RRDB · updated on Sep 3, 2026

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