小型钠冷快堆装料方案研究

由中国原子能科学研究院设计的小型模块化钠冷快堆(简称M1),热功率为3 MW,作为一种封装核电源,采用模块化设计,在工厂进行装料,然后运输到厂址进行安装。考虑到工厂装料的特殊性和钠活泼的化学性质,采用一种新的装料模式——先装料后充钠。通过MCNP程序模拟计算,结果表明:根据M1的装料原则和核测系统,5批装料方案是合理的,同时充钠过程中堆内两个微型裂变电离室也可监测堆芯keff的变化。最终形成一套完备的小型钠冷快堆工厂装料方案,为其他小堆的装料提供启发和指导意义。

Loading Scheme Research of Small-sized Sodium Cooled Fast Reactor

A small-sized modular sodium cooled fast reactor called M1 was designed by China Institute of Atomic Energy (CIAE).As an encapsulated nuclear source with ther-mal power of 3 MW,M1 system adopts modularization,by which the core will be load-ed,then shipped and assembled onsite.Considering factory's special conditions for loading and active chemical property of sodium,a special loading pattern,loading fuel first,then sodium filling,was adopted for M1.Through MCNP code simulation calcu-lations,the results indicate that 5-batch loading scheme is reasonable according to the principles and nuclear measurement system of loading.Two miniature fission ionization chambers placed in the core also monitor k ef of the core during the course of sodium fill-ing.Finally a sound loading scheme of small-sized sodium cooled fast reactor in a factory is formed,which can provide inspiration and guidance regarding loading of other small reactors.