Abstract
As a step in the development of an optimal fuel replacement scheme for a large pressurized water reactor, it was shown that the operating parameters and constraints for individual fuel subassemblies can be expressed in terms of one time dependent parameter, burnup, as long as the gross neutron flux distribution does not change radically with time. The required constraints on the empirical model are therefore adequately satisfied for the intuitively attractive case of scatter (or Roundelay) refueling. As a result, it was possible to investigate analytically a “quaziequilibriumr” cycle for both direct replacement and shuffle refueling. Whereas direct replacement showed little advantage over the equilibrium cycle, shuffling of the fuel to a more optimum configuration at each fuel replacement cycle indicated potential savings of several hundred thousands of dollars a year for a 1000 MWe pressurized water plant.
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