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裂变气体从UO_2燃料芯块中释放出来与燃料棒内的充填气体相混合的过程在许多燃料元件行为分析程序中被看作是一个瞬时的均匀混合过程,即释放出来的裂变气体与整个棒内的充填气体瞬时均匀混合,而实际上裂变气体是首先与释放区域附近的充填气体混合,然后再逐渐与气腔内的充填气体相混合。这一问题在国际上越来越受到重视,在国内还未见到研究这一问题的有关报告。
The process of fission gas released from the UO 2 fuel pellets to mix with the filling gas in the fuel rods is considered as an instantaneous, homogeneous mixing process in many fuel element behavioral analysis procedures, ie, the released fissile gas and the entire rod Of the filling gas is mixed instantaneously and in reality the fission gas is first mixed with the filling gas near the release area and then gradually mixed with the filling gas in the gas chamber. This issue has drawn more and more attention in the world and no relevant report on this issue has yet been seen in China.