Multi-fluid multi-phase subchannel analysis of subassembly accidents of LMFRS

Analyses of experiments simulating hypothetical subassembly accidents such as a large-scale inlet blockage in a Liquid Metal Cooled Fast Reactor (LMFR ) have been performed with computer program KAMUI. With the use of relative ly simple but reasonable constitutive models, the code has been applied to the SCARABEE experiments BE+1 and APL1 to validate the analytical capabilit y against the accident conditions under the multi-pin geometry. The results show that the key events such as sodium boiling, clad melting, molten clad relocation, molten clad freezing were adequately simulated taking into acc ount the effect of heat loss to the coolant flow in the outside channel of the test section. (C) 2000 Elsevier Science Ltd. All rights reserved.