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A new computational model for fast-reactor disassembly analyses is presented. The model utilizes the spaceindependent neutronics, two-dimensional (RZ) Lagrangian hydrodynamics, and an energy-density-dependent equation of state. The reactivity feedbacks due to Doppler broadening and material motion are explicitly taken into account. This model can analyze both highand low-density systems in contrast with the modified Bethe-Tait methods, which are valid only for the low-density systems. A unique feature of this model is its pointwise description of core material contents so that an appropriate equation of state corresponding to sodium-in and sodium-out conditions can be assigned. Another is its rigorous treatment of implosion effects at any arbitrary boundary surface, such as a void region surrounded by a nonvoid region or at the interface of two regions of a zoned core. The total energy release during a nuclear excursion calculated from this model is much lower (except for a completely voided core) than the values obtained from the modified Bethe-Tait methods.

VENUS: A TWO-DIMENSIONAL COUPLED NEUTRONICS-HYDRODYNAMICS COMPUTER PROGRAM FOR FAST-REACTOR POWER EXCURSIONS.