8.2 The Effect of Coolant Jet Subcooling on the Coolant Injection Mode of Vapor Explosions

摘要

The potential of an energetic fuel-coolant interaction (FCI) in light water reactors has bene one of primary safety concerns due to its mechanical energy release by dynamic pressures and expansion energetics. The FCI energetics strongly rely on the initial mixing process between molten fuel and coolant. Since the mixing processes are also influenced by the contact geometries between the molten fuel and the coolant, it is of a great improtance to investigate the energetics in terms of the contact modes. Comparing with a pouring mode, howeve,r studies on stratified and injection modes of FCIs are limited. Hence, the MUSE (MULTI-configurations in Steam Explosions) tests were initiated at JAERI to study the FCIs in various cotnact mdoes by precisely measuring the FCI energetics.