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核技术  2015 

采用SCALE计算氟盐冷却高温堆产氚量的一些问题

DOI: 10.11889/j.0253-3219.2015.hjs.38.080601, PP. 80601-80601

Keywords: 氟盐冷却高温堆,熔融的氟盐,,SCALE,TRITON

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Abstract:

氟盐冷却高温堆(Fluoride-salt-cooledHigh-temperatureReactor,FHR)是以熔融的氟盐(2LiF-BeF2,FLiBe)作为冷却剂、TRISO(Tri-structuralIsotropic)颗粒为燃料、石墨为慢化剂的热中子反应堆。FLiBe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(TransportRigorImplementedwithTime-dependentOperationforNeutronicdepletion)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。

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