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氟盐冷却高温堆(Fluoride-salt-cooled High-temperature Reactor,FHR)是以熔融的氟盐(2Li F-Be F2,FLi Be)作为冷却剂、TRISO(Tri-structural Isotropic)颗粒为燃料、石墨为慢化剂的热中子反应堆。FLi Be冷却剂中的6Li、7Li、9Be和19F等核素在中子的辐照下产生氚。氚于高温下在金属材料中具有较强的渗透性,可能对操作人员及公众造成放射性危害。氚与F原子结合生成具有强腐蚀性的TF,可能影响结构材料的力学性能和使用寿命。本文采用SCALE5.1和SCALE6(包括6.1、6.1.2和目前最新发布版本6.1.3,后文若无特别说明,SCALE6均指此三个版本)中的TRITON(Transport Rigor Implemented with Time-dependent Operation for Neutronic depletion)模块计算了典型FHR的产氚量。计算结果表明,在Li元素的产氚计算中,SCALE6的TRITON模块由于对Li元素处理不当,给计算结果带来较大差异,影响了计算的正确性。在计算9Be和19F的产氚量时,由于不同版本的SCALE采用不同的反应通道等原因,计算结果也存在差异。综合分析表明,通过SCALE计算FHR产氚量时应当优先采用SCALE6,为修正Li元素处理不当的问题,需使用TRITON中经COUPLE子模块更新整合后的截面库(TRITON默认为ft33f001)来单独运行ORIGEN-S模块。
Fluoride-salt-cooled High-temperature Reactor (FHR) is based on the melting of molten salt (2Li F-Be F2, FLi Be) as coolant and TRISO (Tri-structural Isotropic) Thermal neutron reactor for moderator. Nuclides such as 6Li, 7Li, 9Be and 19F in FLi Be coolant generate tritium upon irradiation with neutrons. Tritium is highly permeable to metallic materials at high temperatures and may cause radioactive hazards to operators and the general public. The combination of tritium and F atoms to form a highly corrosive TF may affect the mechanical properties and service life of the structural material. In this paper, TRITON (Transport Rigor Implemented with Time-dependent Operation) in SCALE5.1 and SCALE6 (including 6.1, 6.1.2 and the latest released version 6.1.3, the later text unless otherwise specified, SCALE6 refers to these three versions) for Neutronic depletion module calculates the amount of tritium produced by a typical FHR. The calculation results show that in the tritium production calculation of Li element, the TRITON module of SCALE6 is not properly handled due to the Li element, which brings great difference to the calculation result, which affects the correctness of the calculation. When calculating the amount of tritium produced by 9Be and 19F, there are differences in calculation results due to different reaction channels used in different versions of SCALE. Comprehensive analysis shows that SCALE6 should be used preferentially when calculating the tritium content of FHR by SCALE. To correct the improper handling of Li elements, the integrated cross-section library (TRITON defaults to ft33f001) should be updated by using the COUPLE sub-module in TRITON to run ORIGEN -S module.