Direct Vessel Inclined Injection System for Advanced Power Reactor 1400 Mwe

摘要

During a large-break loss-of-coolant accident(LOCA) in the APR1400, the thermal hydraulicphenomena in the reactor downcomer are expectedto differ from those in the conventional cold leginjection system on account of the direct vesselinjection (DVI) system. However, the DVI wasfound to result in excessive bypass of theemergency core coolant during the late phase ofreflood so that the peak clad temperature in thecore may approach the design limit. The THETAfacility was built to explore improved methods toincrease the coolant penetration to the reactor core.[1] The current paper deals with one of theproposals, i.e. the direct vessel inclined injection(DVII).