Extension of the subgroup method for self-shielding calculation of fully ceramic micro-encapsulated fuel. (1st June 2020)

• Record Type: Journal Article
• Authors: He, Qingming; Yin, Wen; Liu, Zhouyu; Zu, Tiejun; Cao, Liangzhi; Wu, Hongchun
• Is Part Of: Annals of nuclear energy. Volume 140(2020)
• Publication Date: 2020-06-01
• Subjects: Subgroup method -- Double heterogeneity -- FCM -- NECP-X -- Self-shielding calculation; Nuclear energy -- Periodicals; Nuclear engineering -- Periodicals; 621.4805
• DOI: 10.1016/j.anucene.2019.107136
• Languages: English
• ISSNs: 0306-4549

Abstract

Highlights: Two extension schemes of subgroup method are proposed to treat double heterogeneity. Both of the schemes can treat double heterogeneity. The subgroup XS correction scheme can be easily implemented in subgroup method. Abstract: Two extension schemes based on the subgroup method are proposed to treat the double heterogeneity (DH) of fully ceramic micro-encapsulated (FCM) fuels. The first one is the hyper-fine energy group cross section (XS) correction scheme (HFCS), which corrects the hyper-fine energy group XSs with hyper-fine energy group disadvantage factors (DFs) before generation of resonance XS table and physical probability table. The second one is the subgroup XS correction scheme (SGCS), which corrects the subgroup XSs with subgroup DFs calculated by the equivalent homogenization method. These two scheme are implemented in the high-fidelity neutronics code NECP-X. A series cases are tested and the numerical results show that both of the HFCS and the SGCS can treat the DH and the precision of the HFCS is higher than that of the SGCS.