Bettis Atomic Power Laboratory is a U.S. Government-owned, contractor-operated research and development facility located in West Mifflin, Pennsylvania. It solely focuses on the design and development of nuclear power for the U.S. Navy.
Power - Nuclear, Military - R&D
The laboratory, founded in 1949 and consisting of approximately 207 acres, is operated for the Department of Energy (DOE) by Bechtel Bettis, Incorporated, a wholly owned subsidiary of the Bechtel Corporation. Bechtel won the contract to run the laboratory in 1999; prior to that the plant was operated by Westinghouse Electric Corporation.
Also, it's the former sire of Bettis Field: http://members.tripod.com/airfields_freeman/PA/Airfields_PA_SW.htm#bettis