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堆腔注水系统(CIS)可用于导出严重事故下位于压力容器底部的堆芯熔融物余热,防止压力容器熔穿,有效缓解严重事故后果.将数值计算预测下封头临界热流密度(CHF)的方法用于模块式小型堆下封头不同形状下CHF预测,筛选出安全裕量更高的下封头结构设计.结果表明:椭球型下封头和半球型下封头CHF随角度分布曲线大不相同,虽然二者最高CHF值相当,但椭球型CHF值在中部角度区(30°～60°)要远高于半球型CHF值.因此,在新设计中可以考虑采用椭球型下封头以提高堆腔注水系统的安全裕量.“,”Residual heat from melting core located in the bottom of the reactor vessel could be removed by cavity injection system(CIS).The consequence of severe accident can be mitigated.The method of two phase numerical calculation which could be used to predict the under head critical heat flux(CHF) has been researched in this paper.Through the research better geometry which could bring high CHF can be found.The CHF curves of flat ellipsoid and spherical has distinct difference.Despite the maximum value is similar,the CHF curves of flat ellipsoid geometry is larger than that of spherical geometry during the central section(30° ～60°).The flat ellipsoid geometry could enhance the safety margin of the cavity injection system.