Implementation and optimization of WDT algorithm on IMPC-Neutron and comparison of efficiency of various algorithms. (July 2023)

• Record Type: Journal Article
• Authors: Fang, Peng; Yang, Yongwei; Wang, Huiqiao; LeiYang, ; Guo, Yuyao; Lai, Hanghui; Wu, Xiang
• Is Part Of: Annals of nuclear energy. Volume 187(2023)
• Publication Date: 2023-07
• Subjects: Monte Carlo -- Delta-tracking -- Weighted delta-tracking -- IMPC-neutron; Nuclear energy -- Periodicals; Nuclear engineering -- Periodicals; 621.4805
• DOI: 10.1016/j.anucene.2023.109786
• Languages: English
• ISSNs: 0306-4549

Abstract

Highlights: WDT algorithm and ST&WDT&DT hybrid algorithm are implemented in IMPC-Neutron and optimization scheme of WDT algorithm is proposed. The optimal switching threshold of WDT algorithm is tested with higher resolution under different nuclear reactor types based on the optimized scheme. The limitation of WDT algorithm is analyzed. The computational efficiency of various algorithms include ST, ST&DT, ST&WDT&DT in IMPC-Neutron is tested and compared. Abstract: In Monte Carlo code, the use of Delta-tracking algorithm can greatly improve the computational efficiency, but the existence of virtual collision will waste computing resources because the virtual collision introduced by Delta-tracking algorithm does not make any contribution to the statistical results. The Weighted Delta-tracking algorithm makes the virtual collision contribute to the statistics and improves the efficiency of Delta-tracking algorithm. We implemented Weighted Delta-tracking algorithm into the IMPC-Neutron code, then we optimized the Weighted Delta-tracking algorithm to improve its computational efficiency, and analyzed the effects and limitations of Weighted Delta-tracking algorithm in different assemblies. The optimal parameters of Weighted Delta-tracking algorithm are tested in the full reactor models of PWR core and sub-critical fast reactor core. Finally, the calculation efficiency of various neutron transport methods is compared by using IMPC-Neutron.