线性子链法在脉冲中子活化计算中的应用  

Application of Transmutation Trajectory Analysis in Pulsed Neutron Activation Calculation

作　　者：石涛 张竞宇[1] 孔飚 方晟[2] 陈义学[1] SHI Tao;ZHANG Jingyu;KONG Biao;FANG Sheng;CHEN Yixue(School of Nuclear Science and Engineering,North China Electric Power University,Beijing 102206,China;Key Laboratory of Advanced Reactor Engineering and Safety of Ministry of Education,Tsinghua University,Beijing 100084,China)

机构地区：[1]华北电力大学核科学与工程学院,北京102206 [2]清华大学先进反应堆工程与安全教育部重点实验室,北京100084

出　　处：《原子能科学技术》2018年第12期2226-2232,共7页Atomic Energy Science and Technology

基　　金：国家自然科学基金资助项目(11605058);国际热核聚变实验堆计划专项资助项目(2014GB119000);中央高校基本科研业务费专项资金资助项目(2017MS041)

摘　　要：核聚变装置大多在脉冲工况下运行,不同的脉冲运行模式会对材料活化计算产生影响,脉冲的处理方法以及活化计算方法的选择直接决定了计算结果的精度。本文采用线性子链法和解析解公式计算反应链中各核素的数量随时间的变化情况,并通过回溯算法搜索所有参与计算的反应链。针对脉冲中子活化问题,将真实脉冲通过稳态(SS)方法、等效稳态(ESS)方法、连续脉冲(CP)方法进行等效处理,从而简化计算过程,并在此基础上编制了用于脉冲中子活化计算的TACT程序。最后基于天然Fe活化基准题,根据惯性约束聚变装置(IFE)和磁约束聚变装置(MFE)的典型脉冲周期对TACT程序进行测试计算,比较了各种脉冲处理方法的准确度。结果表明:对于IFE和MFE的典型脉冲运行模式,以ESS为前段的CP方法的准确度均优于其他方法;对于CP方法,只需适当保留末尾的真实脉冲数即可达到一定的精度。Nuclear fusion devices mostly run in pulsed condition,and different pulsed operation modes will influence the activation calculation.So,processing methods of pulse and selection of activation calculation methods determine the accuracy of the calculation results.In this paper,the method of transmutation trajectory analysis（TTA）and the analytic solution formula were used to calculate the change of the nuclide quantity with time in the reaction chain.Meanwhile,the back-tracking algorithm was used tosearch all the reaction chains involved in the calculation.To solve pulsed neutron activation problem,the steady state（SS）method,equivalent steady state（ESS）method and continuous pulse（CP）method were adopted to approximately handle real pulses,which simplifies the calculation process.On this basis,apulsed neutron activation calculation program TACT was developed.Finally,based on the activation benchmark of natural Fe,test calculation was made according to the typical pulse history of inertial fusion energy（IFE）and magnetic fusion energy（MFE）experimental reactor systems,and the accuracies of different equivalent methods of pulses were compared.The results show that for IFE and MFE mode,using ESS method in the beginning of CP method has better results than other methods,for CP method,just keeping aproper number of pulses in the end can achieve a certain precision.

关 键 词：线性子链法 回溯算法 脉冲运行 中子活化 TACT程序 

分 类 号：TL329[核科学技术—核技术及应用]