基于NRSTAP-PWR程序的压水堆放射性源项计算研究
Research on Radioactive Source Term Calculation of Pressurized Water Reactor with NRSTAP-PWR Program

放射性源项是用于评价核电厂正常运行期间放射性释放对环境影响的基础数据。本文研究了压水堆中放射性核素的迁移、吸附、滞留、衰变规律，根据放射性核素在系统中的产生和消失机理，建立了计算放射性核素活度的数学模型，开发了相应的计算程序NRSTAP-PWR并进行了测试。核素的核反应数据是从评价核数据库ENDF/B-VII.1中提取的。程序的测试采用与国际同类程序BETA程序比较的方法，结果表明：NRSTAP-PWR程序计算的核素活度与BETA程序的计算结果吻合较好，可用于压水堆核电厂的辐射屏蔽、事故预防、环境评价和核设施退役。
The radioactive source term is the basic data used to evaluate the environmental impact of radioactive release during the normal operation of nuclear power plants. In this paper, the migration, adsorption, retention and decay of radionuclides in PWR are studied. According to the generation and disappearance mechanism of radionuclides in the system, a mathematical model for calculating radionuclide activity is established, and the corresponding calculation program NRSTAP-PWR is developed and tested. The nuclear reaction data of nuclides were extracted from the evaluation nuclear database ENDF/B-VII.1. The program is tested by comparing with the international similar program BETA program. The results show that the nuclide activity calculated by the NRSTAP-PWR program is in good agreement with the calculation results of the BETA program, which can be used for radiation shielding, accident prevention, environmental assessment and nuclear facility decommissioning of PWR nuclear power plants.