Influences of ^7Li enrichment on Th-U fuel breeding for an Improved Molten Salt Fast Reactor（IMSFR）

• Published in: 核技术：英文版 2017, Vol.28 (7), p.105-113
• Main Author: Guang-Chao Li Yang Zou Cheng-Gang Yu Jian-Long Han Jin-Gen Chen Hong-Jie Xu
• Format: Article
• Language: English
• Subjects: 在线处理; 富集; 快堆; 熔盐; 繁殖率; 裂变反应堆; 负温度系数; 铀燃料
• ISSN: 1001-8042; 2210-3147

The molten salt fast reactor（MSFR） shows great promise with high breeding ratio（BR）,large negative temperature coefficient of reactivity,high thermal-electric conversion efficiency,inherent safety,and online reprocessing.Based on an improved MSFR optimized by adding axial fertile salt and a graphite reflector,the influences of ^7Li enrichment on Th-U breeding are investigated,aiming to provide a feasible selection for the molten salt with high fissile breeding and a relatively low technology requirement for ^7Li concentration.With the self-developed molten salt reactor reprocessing sequence based on SCALE6.1,the burn-up calculations with online reprocessing are carried out.Parameters are explored including BR,^233U production,double time（DT）,spectrum,^6Li inventory,neutron absorption,and the tritium production.The results show that the Li enrichment of 99.95% is appropriate in the fast fission reactor.In this case,BR above 1.10 can be achieved for a long time,corresponding to the ^233U production of130 kg per year and DT of 36 years.After 80 years＇ operation,the tritium production for 99.5% is only about 7kg,and there is no obvious increase compared to that for 99.9995%.