【摘要】 长循环堆芯在堆芯燃耗寿期内反应性随堆芯燃耗的变化是堆芯物理设计需要考虑的关键参数。本文以铅-铋合金冷却,U-Pu-Zr燃料组成的堆芯为研究对象,从堆芯核设计的角度研究确定堆芯装载所涉及到中子学特性的影响因素。通过对燃料初始含量、燃料栅格距径比等关键量的分析研究,给出了堆芯物理设计区域的确定方法,并通过分析给出了设计限制区域。分析结果表明,该研究方法是合适的,所得到的限制区域内的堆芯装载满足堆芯燃耗寿期和反应性控制要求。更多还原

【Abstract】 Reactivity variation versus core burnup is a key parameter in neutron design for long-life cy-cle reactor. The factors affecting reactor core loading pattern are studied from neutronic design point of view, based on the core composed of U-Pu-Zr fuel and lead bismuth eutectic coolant. The methodology for defin-ing in-core physical design limiting zone is given, and by analyzing the effects of key parameters such as initial plutonium content and fuel rod pitch-diameter ratio, the in-core physical design limit zone is defined.Analysis results show that the methodology is appropriate and the limiting area defined in this study satisfies the core depletion and core reactivity control requirement.更多还原