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Reduction in workload of BWR in-core fuel shuffling by new optimization methods

机译：通过新的优化方法减少BWR堆芯燃料改组的工作量

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In this paper, new optimization algorithms for the in-core fuel shuffling sequence of a boiling water reactor (BWR) are proposed to reduce outage time. During the short outage of a BWR, fuel shuffling can be a critical path in the periodic overall plant inspection. Therefore, a reduction in operation time for in-core fuel shuffling is essential to improve the plant capacity factor. For BWR in-core fuel shuffling, the shuffling sequence should be selected carefully since a fuel shuffling operation may affect those following it. Furthermore, several constraints must be satisfied during the in-core fuel shuffling of a BWR; e.g., two fuel assemblies must be inserted diagonally in a cell to fix the position of a control blade in it. Therefore, it is difficult to optimize BWR in-core fuel shuffling. In order to resolve this issue, new optimization methods are proposed, and the performances of some optimization algorithms are compared. Test calculations in actual BWR plants reveal that the workload for in-core fuel shuffling can be reduced by the proposed methods. The results of this paper will contribute to increasing the plant capacity factor by reducing the outage time.
机译：本文针对沸水堆堆芯燃料改组顺序提出了新的优化算法，以减少停机时间。在BWR短暂停电期间，燃料混洗可能是整个工厂定期检查中的关键途径。因此，减少堆芯内燃料改组的操作时间对于提高工厂产能系数至关重要。对于BWR堆芯燃料改组，应仔细选择改组顺序，因为燃料改组操作可能会影响后续操作。此外，在BWR堆芯燃料改组期间必须满足几个约束条件。例如，必须将两个燃料组件对角插入电池中，以将控制叶片固定在其中。因此，难以优化BWR堆芯内燃料的混洗。为了解决这个问题，提出了新的优化方法，并比较了一些优化算法的性能。在实际的BWR工厂中的测试计算表明，所提出的方法可以减少堆芯燃料改组的工作量。本文的结果将通过减少中断时间来提高工厂产能因子。

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