多循环堆芯燃料管理优化方法

Analysis of nuclear reactor multicycle fuel management optimization

为了更有效地提高核燃料的利用率，降低核反应堆的运行成本，不仅要研究单循环堆芯燃料管理优化问题，还必须研究多循环优化问题。在回顾现有单循环优化方法的基础上，叙述了一种处理多循环优化问题的方法。利用分步决策的优化策略，多循环优化可以分解为一个两步优化问题。第一步简化多循环优化，使用简化的反应堆物理模型对连续多个循环进行计算，获得每个单循环的优化目标。第二步按照第一步得到的目标进行单循环优化，最终得到各循环最优的组件布置。该方法可以达到延长循环工作期，提高卸料燃耗深度，降低功率峰因子等优化目标。

To increase utilizing rate of nuclear fuel, and decrease run cost of nuclear reactor, not only the single cycle fuel nanagement optimization problem but also the multicycle problem should be studied. The existed single cycle optimization methods are reviewed, and a multicycle fuel management optimization method is presented. Based on stepwise optimization strategy, this method separates the multicycle optimization problem into two sub problems: simplified multicycle optimization and single cycle optimization. Process of the simplified multicycle optimization calculates a number of consecutive fuel cycles utilizing simplified reactor physics models, to acquire the optimization objective of each single cycle. The single cycle optimization then calculates each cycle aiming to these objectives, and finally finds the optimized fuel assembly distribution of each single cycle. This method can achieve objectives of increasing cycle length, increasing average discharge burnup, and decreasing power peak factor.