摘要
由于锂铅合金因具有高增殖比、低活泼性和可能作为冷却剂的特点,被认为是最有潜力的能源堆包层氚增殖材料。在理论模型描述熔融锂铅合金氚释放行为的基础上,开展了中子辐照后Li17Pb83合金的离线氚释放实验。结果表明:释放氚的化学形式99%以上为难溶于水的成分(HT或T2);氚滞留时间随载气中氢分压的增加而减小,氢分压达到1000 Pa后变为常数,且与实体积无关;氚释放速率对温度的依赖性符合Arrhenius定律。以此为基础得到的氚在熔融锂铅中的动力学参数结果,虽与文献值有差异,但同样证明了在633—973 K的范围内,氚从液态锂铅到气相的整个释放过程中起决定作用的是氚在合金内的扩散和气-液界面的多相反应重组。
Lithium-lead alloy is considered to be one of the most prominent tritium breeding materials for the fusion reactor blanket because of its high breeding ratio,and low reactivity and possible use as coolant.An out-of-pile experiment of tritium release from Li17Pb83 alloy was performed after neutron irradiation on the base of mathematical model to describe tritium release behavior from an eutectic lithium-lead alloy.The results suggest that the dominant chemical form of the released tritium（99%） was the water-insoluble component（HT or T2）.Tritium residence time decreased with increasing H2 pressure in carrier gas up to 1000 Pa,and above this concentration limit it became constant and not influenced by the plenum volume.The temperature dependence of the tritium release rate can be described by an Arrhenius law.Consequently,the present results on the kinetic parameters of tritium in molten Li17Pb83 alloy are considered to be different from the values in literature,but it is the same that the overall release process is governed by the diffusion of tritium atoms in the Li17Pb83 and by the heterogeneous reaction at the gas-eutectic interface of the tritium atom recombination at temperatures from 633 to 973 K.
出处
《原子核物理评论》
CAS
CSCD
北大核心
2011年第3期371-376,共6页
Nuclear Physics Review
基金
中国工程物理研究院ITER相关技术研究(20070542)
国家科技部ITER计划专项国内配套研究(2009GB109006)~~
关键词
锂铅合金
氚
载气
释放
Li17Pb83 alloy tritium carrier gas release
