堆外探测器响应函数代表了堆芯活性区各组件对堆外探测器计数率的贡献，反映了堆芯功率分布与探测器计数率的关系。研究了三维离散纵标法(SN)程序TORT的共轭输运方法，并开发相应的处理程序,实现了柱坐标下的三维共轭中子注量率到压水堆各燃料组件响应函数的转换。并基于CAP1400核电厂反应堆模型，分析了其堆外探测器响应函数空间分布的特性，与采用TORT多次正向输运计算结果进行了对比分析，两者符合较好。通过本文研究，实现了压水堆核电厂堆外探测器响应函数的三维空间分布计算。

Ex-core detector response function represents the contribution to the detector tally from each reactor core assembly, reflects the relationship between reactor core power distribution and detector tally. In this paper, the adjoint transport calculation by three-dimensional discrete coordinate method (SN) program TORT was researched, and a post-process code to achieve the conversion between three-dimensional adjoint flux and PWR fuel assembly response functions was developed; Based on the CAP1400 reactor model, its ex-core detector response functions were analyzed, and the results match well with the TORT forward calculation results. Through the research of this paper, three-dimensional distribution calculation of PWR plant ex-core detector response functions was achieved.