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长寿期小型铅基快堆反应性控制研究

Study on Reactivity Control of Long-life Small Lead-cooled Fast Reactor
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摘要 长寿期小型铅基快堆寿期燃耗反应性损失较大,需要建立有效的反应性补偿手段。小型堆紧凑的堆芯布置制约了控制棒系统的设计,且过高的控制棒价值会带来堆芯安全隐患。本研究针对自主设计的长寿期小型铅基快堆LFR-180(寿期反应性波动为6681pcm,1pcm=10^(-5))开展反应性控制研究,探索基于可燃毒物实现反应性控制的方案,并进行事故瞬态安全特性分析。结果表明,以ZrH1.6为慢化剂,B4C为可燃毒物,在组件内联合布置,可将LFR-180寿期内反应性波动降低到575pcm。同时,该反应性控制方案显著提高了堆芯在控制棒意外提出(CRW)事故下堆芯的温度安全裕量,并保证了无保护一回路失流(ULOF)和无保护失热阱(ULOHS)事故下堆芯安全。本研究建立的可燃毒物控制方案能够应用于长寿期小型铅基快堆的反应性补偿。 An effective reactivity control method is needed to compensate for the large reactivity swing during the long lifetime of small lead-cooled fast reactors.However,the compact core structure constrains the arrangement of the control rod system,and the control rod with high reactivity worth can bring safety problems to the core.In this study,the reactivity control of LFR-180(lifetime reactivity swing is 6681pcm,1pcm=10^(-5)),a self-designed small lead-based fast reactor,is studied,the scheme of reactivity control based on flammable poisons is explored,and the transient safety characteristics of accidents are analyzed.The results show that the reactivity swing of LFR-180 can be reduced to 575pcm by using ZrH1.6 as moderator and B4C as burnable poison.At the same time,the reactivity control scheme significantly improves the temperature safety margin of the core under the accident of control rod withdrawal(CRW),and ensures the safety of the core under the accident of unprotected loss of primary flow(ULOF)and unprotected loss of heat sink(ULOHS).The burnable poison control scheme established in this study can be applied to the reactivity compensation of small lead-cooled fast reactors with long life.
作者 金鑫 王立鹏 郭辉 陈立新 江新标 顾汉洋 Jin Xin;Wang Lipeng;Guo Hui;Chen Lixin;Jiang Xinbiao;Gu Hanyang(School of Nuclear Science and Engineering,Shanghai Jiao Tong University,Shanghai,200240,China;Northwest Institute of Nuclear Technology,Xi’an,710024,China)
出处 《核动力工程》 EI CAS CSCD 北大核心 2024年第5期32-39,共8页 Nuclear Power Engineering
基金 国家自然科学基金项目(12105170,12135008)。
关键词 小型铅基快堆 反应性控制 可燃毒物 安全特性分析 Small lead-cooled fast reactor Reactivity control Burnable poison Safety analysis
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