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为了混合堆及聚变堆包层分析的需要，开发了ＢＩＴＨ程序，以对包层的热工水力学及中子学进行综合分析。简述球床的热工水力特征及其数学物理模型，介绍编制的包层热工水力分析程序ＴＨＰＢＨＲ，对ＢＩＳＯＮ１．５全面改造，考虑了共振自屏效应，并与热工水力计算相耦合，并更换ＢＩＳＯＮ１．５自带数据库，修改燃耗计算方法，以适应放射性废物处理、辐照损伤等计算需要。还对ＦＥＢ混合堆外包层用ＢＩＴＨ程序进行了分析。
In order to meet the needs of hybrid heap and fusion reactor cladding analysis, a BITH program was developed to perform a comprehensive analysis of the thermal hydraulics and neutronics of the cladding. Briefly describing the thermal-hydraulic characteristics of the ball bed and its mathematical and physical models, THPBHR, a thermal and hydraulic analysis program for claddings, is introduced. The BISON1.5 is completely remodeled, taking into account the resonance self-screen effect, coupled with thermal hydraulic calculation, BISON1.5 comes with a database to modify the fuel consumption calculation method to meet the calculation needs of radioactive waste treatment, radiation damage and the like. The FEB hybrid heap overlay was also analyzed using the BITH program.