Program Highlights for the Quarter. Quarterly Technical Progress Report, April-June 1981

摘要

The Reliability Program Plan has been completed to the preliminary plan level. Extensive availability analyses were performed for the Reactor Shutdown System design options of a large breeder reactor. Two-out-of-three logic was found to have ten times larger unavailability than two-out-of-four. Two SCRS latch real time tests have been underway since March 1981 to investigate potential of self welding and real-time failure modes. The analysis of License Event Reports from BWR experience has initiated two lessons to be learned for application to LMFBR design. Differences between the conventional frequency analyses approach and the time-series Dynamic Data Systems (DDS) approach have been evaluated for the purpose of system identification. The studies indicated that DDS approach works as well as frequency analysis approach in all cases. The design for the first prototype Thermionic Gas Switch (TGS) has been completed. A test model was constructed for investigations of flow redistribution following a reactor shutdown. The design and operating conditions of the model were derived from hydraulic and geometric similarity requirements for modeling the LMFBR. Other safety study activities are described. (ERA citation 07:043618)