Romania · Bucharest · 44.432, 26.104

HELEN

HELEN, a research reactor (subcritical assembly) in Bucharest, Romania, operated by Faculty of Physics. Decommissioned, first critical in 1969.

It was one of the 5 research reactors Romania has had; 2 remain in operation today. It went critical 12 years after the first research reactor in Romania, VVR-S Bucharest (1957). 20 subcritical assemblies remain in operation today across 13 countries. Its declared uses include teaching and nuclear data measurements.

Country

Romania

City

Bucharest

Type

Subcritical assembly

Thermal power

critical

Operator

Faculty of Physics

Status

Decommissioned

First criticality

1969

Purpose

Teaching, nuclear data

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