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Note that the NNPP Gray book as the incorrect date (3/31/1987). Actually decommissioned on 3/30/1987 based on 1st day covers and newspaper articles.

Part of the Army Nuclear Power Program, SL-1 was a prototype for reactors intended to provide electrical power and heat for small, remote military facilities, such as radar sites near the Arctic Circle, and those in the DEW Line. The design power was 3 MW (thermal), but some 4.7 M…