中文摘要：

利用自行构造的已枚举所有布料方案并完成方案评价的压水堆布料优化基准问题，对应用较为普遍的以组件随机两两交换方式进行解域搜索的模拟退火算法进行了研究，揭示了算法的物理机理，并首次定量给出了算法的搜索效率。研究还表明，用组件“十”字平均k∞分布的约束来过滤非可行解十分有效，结合模拟退火算法使用可获得很高的搜索效率。

英文摘要：

Simulated annealing （SA） method that employs random binary exchange of fuel assemblies to search optimum fuel loading pattern （LP） is studied by its application to an LP search benchmark problem with all LPs enumerated and pre-evaluated. The mechanism of SA method for LP optimization is revealed and for the first time the searching efficiency of SA method is quantitatively evaluated. Investigations also find that the constraint on the distribution of average k∞ value for a fuel assembly crisscross is quite efficient to screen the non-feasible patterns, very high searching efficiency can be achieved by a SA method adopting this teehnique.