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随着AP1000等新一代压水堆的发展,燃耗深度在不断提高,平均卸料燃耗深度提高到60 GW d·t-1。然而,传统使用的WIMS69群和XMAS172群WIMS-D格式多群常数库,其能群结构存在共振峰重叠,核素种类较少,裂变产物产额的偏差较大,并且伪裂变产物中包含的核素种类较多而导致152Gd、160Gd、159Tb、160Tb等重要核素无法得到精确处理等问题。因此,本文主要针对AP1000等新一代反应堆的设计以及运行特点,基于ENDF/B-VII.1库,并且在现有基础上针对WIMS-D库中的伪裂变产物、裂变产物燃耗链以及裂变产物产额等燃耗数据进行更新,再通过NJOY程序开发了SHEM281群WIMS-D格式多群常数库。通过DRAGON程序挂载该WIMSD281库,对其进行临界和燃耗两方面基准验证。计算结果表明,该数据库的计算结果与基准值符合较好,精度较高,结果可靠,可初步用于压水堆的相关计算。
With the development of next-generation pressurized water reactors such as the AP1000, the burnup depth is continuously increasing and the average discharge burnup depth is increased to 60 GW d · t-1. However, WIMS69 group and XMAS172 group WIMS-D format multi-group constant library, which are conventionally used, have formant structure overlap, fewer types of nuclides, larger deviations of fission product yield, and the pseudo-fission products More types of nuclides lead to 152Gd, 160Gd, 159Tb, 160Tb and other important nuclides can not be accurately handled and so on. Therefore, this paper mainly focuses on the design and operation characteristics of next-generation reactors, such as AP1000. Based on the ENDF / B-VII.1 library, and based on the existing research results, the fission products, Product yield and other fuel consumption data update, and then through the NJOY program developed SHEM281 group WIMS-D format multi-group constant library. The WIMSD281 library is mounted by the DRAGON program and is benchmarked against both critical and burnup conditions. The calculation results show that the calculation result of this database is in good agreement with the reference value, with high precision and reliable results, and can be used primarily for the calculation of PWR.