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United States United States · Poughkeepsie, NY · 41.671, -73.907 (approximate location)

PLATR Pawling Lattice Test Rig

PLATR Pawling Lattice Test Rig, a research reactor (critical assembly) in Poughkeepsie, NY, United States, with 100 W of thermal power, operated by UNC Remote Experimental Station. 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). 44 critical assemblies remain in operation today across 12 countries. Its declared uses include nuclear data measurements and materials testing.

Country
United States
City
Poughkeepsie, NY
Type
Critical assembly
Thermal power
100 W
Operator
UNC Remote Experimental Station
Status
Decommissioned
First criticality
1958
Purpose
Nuclear data, materials testing

Data: IAEA RRDB · updated on Sep 3, 2026

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