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利用优化方法寻找压水堆最优的燃料装载格式,优化的目标函数为堆芯的功率峰因子,用物理原则指导下的直接搜索法寻找优化解。通过堆芯内燃料组件互换来搜索功率峰因子最小的燃料装载格式。搜索分两段进行:第一阶段是布置堆芯内部的新组件,以得到具有较小功率峰因子的合理装载格式;第二阶段是在上述合理装载格式基础上,布置堆芯内有燃耗的组件,以进一步降低堆芯的功率峰因子,得到优化装载格式。在优化过程中,可分别采用或随意组合采用3/2群粗网扩散理论和两群节块格林函数扩散理论计算每次换料后的反应堆两维功率分布及其它反应堆状态量,不仅保证了结果的准确性,而且可以节省CPU时间。除上述优化计算外,还能作燃耗、调临界硼浓度等计算。计算程序是采用FORTRAN-Ⅳ算法语言编制。
The optimization method is used to find the optimal fuel loading format for PWR. The optimized objective function is the power peak factor of the core, and the direct search method under the guidance of physical principles is used to find the optimal solution. The fuel loading format with the lowest power peak factor is searched by interchanging the in-core fuel assemblies. The search is carried out in two stages: the first stage is to arrange new components inside the core to get a reasonable loading format with a smaller power peak factor; the second stage is to arrange the core with fuel burn on the basis of the above reasonable loading format Components to further reduce the core peak power factor, get the optimized loading format. In the process of optimization, two-dimensional power distribution and other state quantities of reactors after each refueling can be calculated by using 3/2 group coarse-mesh diffusion theory and two-group-section Green’s function diffusion theory respectively or not. The accuracy of the results, but also saves CPU time. In addition to the above optimization, but also for fuel consumption, adjust the critical boron concentration calculation. Calculation program is compiled using FORTRAN-Ⅳ algorithm language.