According to the construction requirement of China Initiative Accelerator Driven System (CiADS ) , a conceptual design of subcritical reactor in CiADS was completed .The subcritical reactor is a liquid lead-bismuth cooled fast reactor with the semi-pool semi-loop type arrangement mode ,and the center tube in vessel was used to realize the structure coupling with the spallation target . The relatively mature fuel scheme and refueling pattern were adopted ,the unique lead-bismuth coolant auxiliary system was designed ,and a variety of engineering safety systems were set up to ensure the safety of the reactor .In the design of the CiADS subcritical reactor ,the feasibility of the reactor-target interface is fully considered ,and the favorable heat transfer capaci-ty of the liquid lead-bismuth is utilized .The natural circulation capacity characteristic of the pool-type reactor and low coolant capacity characteristic of the loop-type reactor are realized together . The good feasibility , safety , arrangement flexibility and technical scalability are combined in the CiADS reactor design .%根据中国加速器驱动嬗变研究装置(CiADS)的建设要求,完成了CiADS中次临界反应堆的概念设计.次临界反应堆为液态铅铋冷却快中子反应堆,采用半池式-半回路式的布置方式,通过主容器的中心管实现了与散裂靶在结构上的耦合.燃料组件及换料方式采用相对成熟的技术方案,设置了铅铋主冷却剂辅助系统,通过多种专设安全设施来保证反应堆的安全.CiADS次临界反应堆充分考虑了堆靶耦合界面的可实现性,利用了液态铅铋冷却剂良好的传热性,结合了池式堆冷却剂自然循环的特性及回路式堆冷却剂装量少的特性,具有良好的可行性、安全性、布置灵活性和技术扩展性.
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