Effects of Core Inlet Water Subcooling on Reflooding Phenomena. SCTF Core-I Forced Feed Flooding Tests

摘要

The major objectives of Slab Core Test Facility (SCTF) Program are to investigate the two-dimensional thermo-hydrodynamic behavior in the core and the fluid communication between the core and the upper plenum during the reflooding phase of a PWR-LOCA. The present report describes the experimental studies on the effects of core inlet water subcooling on reflooding phenomena under forced flooding condition observed in Tests Sl-04 (high subcooling test) and Sl-01 (base case test). Maximum core inlet water subcoolings in the two tests were 37 and 16 K, respectively. It was found that the higher core inlet water subcooling results in the higher quench propagation, the higher heat transfer coefficient and the lower void fraction near the quench front, the larger water accumulation in the core and upper plenum, the smaller water carryover through the hot leg, and the more significant cross flow in the core. (Atomindex citation 15:059467)