可燃毒物提高小型压水堆堆芯寿期研究

针对长寿期堆芯的应用需求，开展了提高小型压水堆堆芯寿期研究。以棒状燃料为对象，对不同栅格尺寸和不同可燃毒物的选取进行计算，得出小型压水堆堆芯寿期相关影响因素。通过对不同尺寸的燃料栅格进行输运 燃耗计算，得到燃耗最佳栅格尺寸。以燃耗最佳栅格尺寸建立组件，并选择转换性能好的锕系核素²⁴⁰PuO₂作为可燃毒物，利用²⁴⁰Pu吸收中子转换成易裂变核素²⁴¹Pu的特性，对堆芯实现反应性控制和寿期延长。本研究通过对燃料栅格尺寸和可燃毒物的合理选择，提高了燃料利用率，达到延长堆芯寿期的目的。

Study on Burnable Poison to Improve Life of Small PWR Core

According to the application requirements of long-life cores, research on improving the core life of small pressurized water reactor (PWR) was carried out. Taking rod-shaped fuel as the object, the selection of different lattice sizes and different burnable poisons was calculated, and the influencing factors of core life of small PWR were obtained. By carrying out transport-burnup calculations on fuel lattices of different sizes, the burnup optimum lattice size was obtained. The components were built with the burnup optimum lattice size and the actinide nuclide ²⁴⁰PuO₂ with good conversion performance was selected as a burnable poison. Using the characteristic of ²⁴⁰Pu absorbing neutrons converted to fissile nuclide ²⁴¹Pu, reactivity control of the core and life extension are achieved. Through the reasonable selection of fuel lattice size and burnable poison, the fuel utilization ratio is improved and the core life is extended.