Method to minimize power peaking in refueling schedule of boiling water reactor.

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概要

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• A method of optimizing fuel assembly allocation is proposed for a certain type of refueling schedule problem of Boiling Water Reactor (BWR) in which cycle length and number of fresh fuel assemblies to be loaded are predetermined.<BR>The optimization is aimed at minimizing power peaking factor. The problem is decomposed into two subproblems : one to optimize the global region-wise shuffling scheme and the other to optimize assembly allocation. Linear programming is iteratively solved in the former subproblem such that the maximum excess reactivity is minimized and a direct search method is used in the latter subproblem.<BR>The method is successfully applied to the 2nd and the 3rd cycle refueling schedule problems of a 460 MWe BWR. The optimized reloading patterns are compared with other non-optimal patterns which have much simpler or more symmetrical shuffling schemes. The optimization shows merit in reducing power peaking without sacrificing the cycle length.

• 一般社団法人 日本原子力学会の論文

著者

• YOKOMIZO Osamu

  Atomic Energy Research Laboratory, Hitachi Ltd.

• MOTODA Hiroshi

  Atomic Energy Research Laboratory, Hitachi Ltd.

関連論文

• Two-phase flow instability caused by density head pressure drop.
• Method to minimize power peaking in refueling schedule of boiling water reactor.
• Optimization of fuel assembly allocation for boiling water reactors.

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