Pretest prediction of the W-1 SLSF experiment using the COMMIX-1A computer code. [LMFBR]

The numerical simulation of a 19-rod LMFBR fuel assembly undergoing a Loss of Piping Integrity (LOPI) transient has been carried out using the COMMIX-1A computer code. COMMIX-1A is a three-dimensional, transient, single-phase, thermal-hydraulic computer code. The results are compiled to form a pre-test prediction of the W-1 in-pile experiment which will begin in the near future. Since COMMIX-1A performs single-phase analyses, the simulation is terminated when boiling first occurs in the fuel assembly.