Previously the site of one of the world's first commercial nuclear test reactors, Waltz Mill presently quarters more than 500 engineers, technicians, and service support personnel for Field Services. It is the Westinghouse Center of Excellence for service technology, steam generator services, reactor systems services, outage management support and training. Full-size mock-ups of steam generators and fuel assemblies and a control room simulator prepare personnel to service and operate nuclear power plants safely and efficiently. Radiological equipment, maintenance, and storage facilities are also housed at the Waltz Mill Site. In addition, the Westinghouse subsidiary, WesDyne International, is headquartered at the Waltz Mill Site.
The Waltz Mill Site is situated on 850 acres of land near Madison, Pennsylvania, approximately 30 miles southeast of Pittsburgh. In the early 1800s, Jacob Waltz operated a sawmill, carding mill, distillery, and gristmill close to the property, which was known country-wide as Waltz Mill. A track for racing horses was also located where most of the Westinghouse Site is now situated. Westinghouse purchased the land in 1955.