压水堆堆芯换料设计优化的研究

讨论压水堆堆芯换料设计优化问题，并研制一套实用的换料优化软件包，可用于低泄漏、外－内和改进的外－内装料方案的优化。在低泄漏方案优化时，利用哈林原理将燃料组件布置与可燃毒物配置的优化问题脱耦成两步优化问题。先用线性规划方法进行无可燃毒物时燃料组件布置的优化，然后再用可变容差法寻找可燃毒物的优化布置。应用该软件对秦山核电厂首次难芯换料方案进行了优化，提出了可供参考的一些优化布置方案。

OPTIMIZATION OF RELOAD CORE DESIGN FOR PWR

Adirect emcient optimization techniquehas been eHectedfor automatically optimizing thereload of PWR. The objective functions include: maximization of end-of-cycle(EOC) reactivityand maximization of average discharge burnup. The fuel loading optimization and burnable poison(BP) optimization are separated into two stages by using Haling principle. In the first stage, theoptimum fuel reloading pattern without BP is determined by the Linear Programming method us-ing enrichments as control variable,while in the second stage the optimum BP allocation is deter-mined by the Flexible Tolerance Method using the number of BP rods as control variable. A prac-tical and efficient PWR reloading optimization program based on above theory has been encodedand successfully applied to Qinshan Nuclear Power Plant(QNP) cycle 2 reloading design.