[en] The SP-100 Ground Engineering System (GES) test will be a full-scale land based demonstration of the SP-100 space reactor. The test reactor will be representative of a 300 KWe (8000 kWt) power system. The reactor is a compact fast reactor cooled with lithium and operated at high coolant temperatures. The primary heat transport system will be constructed of refractory metals and enclosed in a high-quality vacuum chamber. The GES Site Operator will be responsible for providing facilities, equipment, reactor operations, and technical expertise to assemble, operate, and disassemble the test article. The Hanford Site facilities are used during four stages of the test: facilities for the pretest assembly of components; the primary facility for reactor operations and conduct of the nuclear tests; post-test examination facilities; and finally decommissioning and disposal