400 MW泳池式低温供热堆堆芯核设计

Nuclear design of 400 MWpool-type low-temperature heating reactor core

泳池式低温供热堆堆芯在深水池内,利用了深水静压力来提高堆芯出口温度,以满足供热系统需求。400 MW泳池式低温供热堆堆芯采用69盒组件堆芯核设计方案,该方案的特点是:采用截短型压水堆燃料组件、低功率密度堆芯、长周期循环长度、无硼控反应性补偿机制、由载钆燃料棒提供部分后备反应性。给出了堆芯核设计准则,对装载方案进行了优化设计,对各循环进行了提棒顺序搜索和燃耗计算,对各循环的重要物理参数进行了分析。研究结果表明:69盒组件堆芯方案满足相关的核设计准则,具有良好的经济性和安全性。

[Background]As a kind of clean energy,nuclear energy has obvious advantages in reducing fossil energy consumption and pollutant emission.Nuclear energy can be used to provide not only electric energy,but also direct heating.[Purpose]This study aims to design and optimize the pool type heating reactor core to make it with good economy and safety.[Methods]The core of heating reactor was located in the deep pool to make use of static pressure of the deep water for the outlet temperature elevating to meet the requirements of the heating system.The nuclear design of a core with 69 assemblies was applied to 400 MWpool-type heating reactor,it was characterized by truncated pressurized water reactor(PWR)assemblies,low power density,long cycle length,non-boron reactivity control mechanism.The gadolinium fuel rods was used to provide a part of backup reactivity.The burn-up of each cycle was calculated,and the important physical parameters were analyzed.Finally,the core design criteria were given,the loading mode of the core and the rod withdraw sequence were optimized.[Results]Calculation results show that the maximum discharge burnup is 31.10 GW·d·t^(−1)(U).The shutdown depth of the first and second shutdown system are 0.06569 and 0.02971,respectively.[Conclusions]Relevant research and calculation in this study demonstrate that the core with 69 assemblies meets the relevant nuclear design criteria and has good economy and safety.