Poland · Otwock · 52.117, 21.267

HELENA

HELENA, a research reactor (subcritical assembly) in Otwock, Poland, with 1 W of thermal power, operated by Institute of Atomic Energy. 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). 20 subcritical assemblies remain in operation today across 13 countries. Its declared uses include nuclear data measurements.

Country

Poland

City

Otwock

Type

Subcritical assembly

Thermal power

1 W

Operator

Institute of Atomic Energy

Status

Decommissioned

First criticality

1963

Purpose

Nuclear data

See also: every research reactor in Poland · How research reactors work