A Method for Determining Refueling Scheme for Transient Cycles Using Equilibrium and Fertile Fuel

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A new method is proposed for determining the refueling scheme to be adopted for the initial transient period of reactor operation. The scheme permits the use of feed fuel with constant enrichment (the equilibrium fuel) from the beginning of reactor life and obviate the need of providing an additional variety of fuel with lower enrichment for the initial core as required in the conventional refueling scheme. In the present method, a certain number of fertile fuel assemblies are scattered in the core regions in the initial fuel charge, to lower the reactivity of the initial core. The method proposed here considers the nuclear characteristics of a reactor in establishing a pattern to be followed in replacing the fertile fuel assemblies with equilibrium fuel assemblies at every refueling step in order to let the core reach equilibrium as soon as possible. This method is based on the following considerations :<BR>(1) Fertile fuel assemblies are uniformly scattered in the core regions.<BR>(2) The pattern of reactivity change during the transient period is made as similar as possible to that in the equilibrium period.<BR>By this method, it is possible to make the refueling intervals almost constant already from the beginning of the transient period, with a length of interval similar to that of the equilibrium period. And the number of the fuel assemblies to be discharged at every refueling step in the transient period can also be made the same as in the equilibrium period.
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A Method for Determining Refueling Scheme for Transient Cycles Using Equilibrium and Fertile Fuel

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