高燃耗乏燃料组件运输期间的限制准则研究  

Restriction Criterion of High-burnup Spent Fuel Assemblies during Transportation

作　　者：方俊 李亚如 刘佳泰 孙燕宇 FANG Jun;LI Yaru;LIU Jiatai;SUN Yanyu(China Nuclear Power Engineering Co.,Ltd.,Beijing 100840,China)

机构地区：[1]中国核电工程有限公司,北京100840

出　　处：《包装工程》2025年第5期250-257,共8页Packaging Engineering

基　　金：中核集团集中研发项目“华龙后续机型研发”(2008)。

摘　　要：目的研究运输期间乏燃料组件包壳温度变化幅度的影响因素,以确定乏燃料运输容器装载高燃耗组件的热负荷与装载位置是否存在限制。方法将乏燃料运输容器的径向传热简化为具有内热源的圆柱体导热问题,开展理论分析,并使用CFX软件开展三维温度场分析,进一步证明理论分析的结论。结果高温工况和低温工况下大气环境温度的差值、太阳曝晒与热负荷随时间的衰减是包壳温度变化的主要原因,高温工况与低温工况热负荷的偏差引入的容器温度梯度差值,被容器选用的材料和乏燃料组件热导率随温度升高而变大以及热辐射随温度升高而增强的效应抵消。容器外表面温度的变化幅度基本决定包壳温度的变化幅度,前者与容器外表面的发射率和太阳辐射吸收比的组合有关,有可能超过100℃,因此必须对装载高燃耗组件的运输容器是否满足包壳温度变化限制准则进行分析论证。结论容器外表面的发射率应尽可能高,太阳辐射吸收比应尽可能低,在恰当的组合下,可以保证任意热负荷和任意装载方案下包壳温度变化幅度满足包壳温度变化限制准则,从而无需在技术规格书中对装载高燃耗组件的热负荷和装载方案提出限制,保证了装载的灵活性。The work aims to study the factors affecting the cladding temperature variation of spent fuel assemblies during transportation to determine whether there are restrictions on the thermal load and loading position of high-burnup assemblies in spent fuel cask.The radial heat transfer of the spent fuel cask was simplified into the heat conduction of a cylinder with internal heat source to carry out theoretical analysis,and the CFX software was used to carry out three-dimensional temperature field analysis to further prove the conclusion of theoretical analysis.The difference in atmospheric environment temperature between hot condition and cold condition,the solar radiation and the decay of thermal load over time were the main reasons for the variation in cladding temperature.The difference in cask temperature gradient introduced by the deviation of thermal load between hot condition and cold condition was offset by the effects of the increase in thermal conductivity of the material selected for the cask and the spent fuel assembly with the increase in temperature and the enhancement of thermal radiation with the increase in temperature.The variation of the cask external surface temperature basically determined the variation of the cladding temperature,and the former was related to the combination of the emissivity and solar radiation absorption ratio of the cask external surface and might exceed 100℃.

关 键 词：高燃耗 乏燃料 包壳 运输容器 非满载 

分 类 号：TL931[核科学技术—辐射防护及环境保护] TB485.3[一般工业技术—包装工程]