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United States United States · Ballston Spa, NY · 43.007, -73.851 (approximate location)

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

Data: IAEA RRDB · updated on Sep 3, 2026

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