military and civilian users are now performing specific integrated spacecraft designs using the latest SP-1OO data. The system level validation activities are shown pictorially in Fig. 6. There are nine system level tasks that will be conducted throughout the GES project. These system tasks will integrate and overview the subsystem tasks. The system test data requirements will be defined by systems and the data necessary for system validation will be obtained from the subsystem tasks. Subsystem Status The generic system design has been divided into eight subsystems with the interfaces between all subsystems well defined. The GES project analyses and experiments which are required to validate each of the eight subsystems are shown in block diagrams (Figs 7-14) with a pictorial summary of the subtasks and arrows to show the flow of the subtask results. The two GES hardware tests that will be conducted to validate interface compatibility between subsystems and to validate system level performance are the Nuclear Assembly Test (NAT) and the Integrated Assembly Test (IAT). The NAT will be used to validate the interfaces and the performance of the reactor, reactor instrumentation and control, and shield subsystems. The test configuration of NAT is shown in Fig. 15. The IAT will be used to validate the interfaces and the performance of the heat transport, power conversion, heat rejection, power conditioner, control and distribution, and the mechanical/structural subsystems. The test configuration of the IAT is shown in Fig. 16. Reactor Subsystems Status The components and configuration of the reactor subsystem are shown in Fig. 17. The reactor preliminary design for the nuclear assembly ground test is complete and the review was held 20-23 June 1989. The engineering criticals used to validate the neutronic design were completed in December 1988. The SP-100 neutronic design
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