GLEEP
GLEEP, a research reactor (graphite) in Harwell, United Kingdom, with 50 kW of thermal power, operated by Atomic Energy Research Establishment. Decommissioned, first critical in 1947.
It was one of the 46 research reactors the United Kingdom has had; 1 remains in operation today. It was the first research reactor in the United Kingdom to go critical. 4 graphite-moderated research reactors remain in operation today across 3 countries.
- Country
- United Kingdom
- City
- Harwell
- Type
- Graphite
- Thermal power
- 50 kW
- Operator
- Atomic Energy Research Establishment
- Status
- Decommissioned
- First criticality
- 1947
See also: every research reactor in United Kingdom · How research reactors work
Data: IAEA RRDB · updated on Sep 3, 2026