United States United States · Schenectady, NY · 42.804, -73.929 (approximate location)

TTR-1 Thermal Test

TTR-1 Thermal Test, a research reactor (graphite) in Schenectady, NY, United States, with 10 kW of thermal power, operated by Knolls Atomic Power Laboratory. Decommissioned, first critical in 1951.

It was one of the 340 research reactors the United States has had; 48 remain in operation today. It went critical 9 years after the first research reactor in the United States, CP-1, Chicago Pile 1 (1942). 4 graphite-moderated research reactors remain in operation today across 3 countries. Its declared uses include activation analysis and nuclear data measurements.

Country
United States
City
Schenectady, NY
Type
Graphite
Thermal power
10 kW
Operator
Knolls Atomic Power Laboratory
Status
Decommissioned
First criticality
1951
Purpose
Activation analysis, nuclear data

Data: IAEA RRDB · updated on Sep 3, 2026

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