Thermal and Structural Behavior of EBR-II Plant During Unprotected Loss-of-Flow Transients

摘要

The Shutdown Heat Removal Test (SHRT) program of EBR-II consists of some 50 individual tests to investigate the natural convective cooling phenomenon of the EBR-II plant under a variety of protected (with reactor scram) and unprotected (without reactor scram) loss-of-flow (LOF) transients. Two unprotected loss of flow (LOF) transients are selected to demonstrate the thermal-hydraulic and structural response of EBR-II major components. Case 1 is a loss-of-total-pump-power transient, in which the auxiliary pump is off and the test is initiated by simultaneously tripping the primary and the secondary flows, and case 2 is a loss-of-secondary-flow transient, in which the secondary sodium pump is tripped to start the test. In both transients the reactor will not be scrammed. The structures considered in the study include the reactor vessel, the intermediate heat exchanger (IHX) and the superheater. (ERA citation 10:033740)