Studies on Lmfbr Subassembly Boundary Integrity.

摘要

Initial faults and their associated failure-propagation modes are identified with the use of safety-assurance diagrams. To put these initial faults into perspective,reactor operating experience is reviewed with particular emphasis on the fuel-melting incident in the Fermi reactor. The ability of the subassembly duct to withstand a pressure-pulse loading is reviewed,including recent analyses of local MFCIs and subassembly-duct mechanical response. In addition,the thermal and mechanical response of the subassembly duct to contact with molten fuel is reviewed and extended;the thermal response (meltthrough) is discussed in the light of more recent analyses,and the mechanical-response behavior (thermal-stress analysis) is extended into the plastic regime. The consequences of a localized failure of the subassembly duct is also analyzed. 28references.