基于蒙特卡罗方法的TMSR-LF1功能孔道合金套管的辐照损伤模拟与分析  

Radiation Damage Simulation and Analysis of TMSR-LF1 Functional Channel Alloy Sleeves Based on Monte Carlo Method

作　　者：刘亚芬[1] 于世和[1] 严睿[1] 周波[1] 邹杨[1] 蔡翔舟[1] LIU Yafen;YU Shihe;YAN Rui;ZHOU Bo;ZOU Yang;CAI Xiangzhou(Shanghai Institute of Applied Physics,Chinese Academy of Sciences,Shanghai 201800,China)

机构地区：[1]中国科学院上海应用物理研究所,上海201800

出　　处：《现代应用物理》2023年第1期145-151,共7页Modern Applied Physics

基　　金：中国科学院战略性先导科技专项基金资助项目(XDA02010000);中国科学院前沿科学重点研究基金资助项目(QYZDY-SSW-JSC016)。

摘　　要：2 MW液态燃料钍基熔盐实验堆(thorium molten salt reactor-liquid fuel, TMSR-LF1)功能孔道中用于隔离燃料盐的合金套管有7根位于堆中央石墨构件内,受到中子辐照强,辐照损伤大。针对该问题,基于NJOY-2016加工的多群原子离位截面,采用蒙特卡罗程序MCNP对TMSR-LF1中央石墨构件中的合金套管的中子辐照损伤进行了研究,分析了石墨构件中栅元和中心孔道套管的中子注量率分布特点,并根据结果进行了能反应中子辐照损伤量的原子离位数率RDPA和嬗变He产生率的详细计算。计算结果表明,TMSR-LF1堆芯功能套管中RDPA最大值在中心套管的中心平面处,225°方向,为3.0×10^(-9)s^(-1),嬗变He产生率最大值同样发生在中心套管,为2.43×10^(-7)appm·s^(-1)(1 appm=1×10^(6))。研究结论对TMSR-LF1设计和堆芯优化具有重要的实际意义。2 MW thorium molten salt reactor-liquid fuel(TMSR-LF1)contains 7 alloy sleeves for isolating fuel salt in the functional channels.Functional channels are located in the graphite components of the core and suffering strong neutron radiation,leading to the greater radiation damage.In this paper,the radiation damage for the alloy sleeves is calculated and analyzed by MCNP based on the multi-group atom dissociation cross sections processed by NJOY-2016.The characteristics of neutron fluence rate distribution in the cells and sleeve of the central channel in the central graphite component of the core are analyzed.Displacement per atom rate(R DPA)and transmutation helium production rate are calculated in detail in the 7 alloy sleeves according to the fluence rate distribution results.The calculation results show that the maximum value of R DPA in TMSR-LF1 core functional sleeve is 3.0×10^(-9) s^(-1),at the central plane of the central sleeve,in the direction of 225°.The maximum value of transmutation He generation rate is 2.43×10^(-7) appm·s^(-1)(1appm=1×10^(6)),and it also occurs in the center alloy sleeve.The research conclusion has important practical significance for TMSR-LF1 design and core optimization.

关 键 词：TMSR-LF1 辐照损伤 中子注量率 原子离位数率 嬗变He产生率 

分 类 号：TL329[核科学技术—核技术及应用] O411[理学—理论物理]