Abstract
CAP1400 is an advanced passive nuclear power plant. In order to support its safety analysis required by the authority, a new integral test facility, ACME, is founded. A series of SBLOCA tests are performed to validate CAP1400 technology. In this paper, some test data are shown to explain several important phenomena (cold leg stratification, accumulator nitrogen injection, downcomer asymmetric temperature distribution, and break size effect) observed in the tests. Among these phenomena, the earlier occurrence of cold leg stratification is caused by coolant pumps’ specific structure. The nitrogen injected by ACCs is found to delay the recovery of CMT injection flow. The downcomer asymmetric temperature profile is resulted from DVI injection. Tests are also compared to discover the effect of break sizes and locations. Afterwards, a modified version of RELAP5/MOD3 is validated by the test data. The results show that the modified code can be used for CAP1400 SBLOCA analysis.
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