MULTI-FIELD HYDRODYNAMIC DISASSEMBLY CALCULATIONS WITH SPACE-TIME KINETICS: FX2/VENUS-III.

The development of computer codes which analyze the hydrodynamics, neutronics, and thermodynamics of hypothetical LMFBR disassembly starting with the Lagrangian 2-D hydrodynamics code VENUS and extending to the Eulerian hydrodynamics code FX2/VENUS-III RM which includes treatment of multi-field motions as well as space-time kinetics are reviewed. The physical assumptions that form their basis are indicated and the differences in solution technique are illustrated. Primary emphasis is given to the description of the Eulerian code development with indications of the capabilities of implicit differencing, the necessity of tracking generic fuel types, the effect of relative motion, and the role of space-time kinetics. Several examples and comparisons of codes are given for FTR and 1000 MW(e) designs.