Deep Well No. 4 provides make-up water to the Advanced Test Reactor (ATR) in the event of a seismic-induced loss-of-coolant accident. A new diesel generator system was required to supply backup power to Deep Well No. 4. The associated structures, systems, and components (SSCs) for the new installation include the diesel generator and its enclosure, diesel fuel tank, transformer, switchgear, electrical cabling and duct bank, and motor control center. SGH performed a seismic qualification of the generator and the SSCs per Performance Category 4 (PC-4) seismic criteria.