基于WIMS-D库燃耗数据的更新与基准验证

摘要

Background: With the development of AP1000, the burnup has been raised constantly and the average burnup is expected to reach 60 GW d·t?1. However, the traditional WIMS-D library which is based on WIMS69 and XMAS172 energy group structure, has too many flaws such as the resonance overlap effect, lack of some nuclides, unreliable value of the fission product yield and thus can't explicitly treat the nuclide of152Gd,160Gd,159Tb and160Tb in the pseudo fission product.Purpose: A new version of WIMS-D library based on ENDF/B-VII.1 with SHEM281 group structure is developed to improve the accuracy of cell calculation using the NJOY program.Methods: The new library is verified through the analysis of criticality and burnup benchmarks by using DRAGON program.Results: The results show that the calculation values are in good agreement with the benchmark.Conclusion: The new library has high precision and the result is reliable, which can be used for the PWR's calculation.%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.