S3G Submarine Prototype
S3G Submarine Prototype, a research reactor (other) in Ballston Spa, NY, United States, operated by Bechtel Marine Propulsion Corporation. Decommissioned, first critical in 1958.
It was one of the 340 research reactors the United States has had; 48 remain in operation today. It went critical 16 years after the first research reactor in the United States, CP-1, Chicago Pile 1 (1942). Its declared uses include training.
- Country
- United States
- City
- Ballston Spa, NY
- Type
- Other
- Thermal power
- critical
- Operator
- Bechtel Marine Propulsion Corporation
- Status
- Decommissioned
- First criticality
- 1958
- Purpose
- Training
See also: every research reactor in United States · How research reactors work
Data: IAEA RRDB · updated on Sep 3, 2026