Nuclear Science and Techniques

《核技术》(英文版) ISSN 1001-8042 CN 31-1559/TL     2019 Impact factor 1.556

Nuclear Science and Techniques ›› 2020, Vol. 31 ›› Issue (8): 83 doi: 10.1007/s41365-020-00790-x

• NUCLEAR ENERGY SCIENCE AND ENGINEERING • Previous Articles     Next Articles

Th-U cycle performance analysis based on molten chloride salt and molten fluoride salt fast reactors

Liao-Yuan He1,2,3, Shao-Peng Xia1,2, Xue-Mei Zhou1,2, Jin-Gen Chen1,2,3, Gui-Min Liu1,2,3, Yang Zou1,2,3, Rui Yan1,2   

  1. 1Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China
    2CAS Innovative Academies in TMSR Energy System, Chinese Academy of Sciences, Shanghai 201800, China
    3University of Chinese Academy of Sciences, Beijing 100049, China
  • Received:2020-03-06 Revised:2020-05-28 Accepted:2020-05-29
  • Contact: Rui Yan
  • Supported by:
    This work was supported by the Chinese TMSR Strategic Pioneer Science and Technology Project (No. XDA02010000) and the National Natural Science Foundation of China (No. 91326201).
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Liao-Yuan He, Shao-Peng Xia, Xue-Mei Zhou, Jin-Gen Chen, Gui-Min Liu, Yang Zou, Rui Yan. Th-U cycle performance analysis based on molten chloride salt and molten fluoride salt fast reactors.Nuclear Science and Techniques, 2020, 31(8): 83     doi: 10.1007/s41365-020-00790-x

Abstract: The recent development of molten salt fast reactors has generated a renewed interest in them. As compared to traditional solid-fueled fast neutron systems, it has many unique advantages, e.g., lower fissile inventory, no initial criticality reserve, waste reduction, and a simplified fuel cycle. It has been recognized as an ideal reactor for achieving a closed Th-U cycle. Based on the carrier-salt, molten salt fast reactors could be divided into either a molten chloride salt fast reactor (MCFR) or a molten fluoride salt fast reactor (MFFR); to compare their Th-U cycle performance, the neutronic parameters in a Breeding and Burning (B&B) transition scenario were studied based on similar core geometry and power. The results demonstrated that the required reprocessing rate for an MCFR to achieve self-breeding was lower than that of an MFFR. Moreover, the breeding capability of an MCFR was better than that of an MFFR; at a reprocessing rate of 40 L/day, using LEU and Pu as start-up fissile materials, the doubling-time (DT) of an MFFR and MCFR were 88.0 years and 48.0 years, and 16.5 years and 16.2 years, respectively. Besides, an MCFR has lower radio-toxicity due to lower buildup of fission products (FPs) and transuranium (TRU), while an MFFR has a larger, delayed neutron fraction with smaller changes during the entire operation.

Key words: Th-U cycle, Molten salt fast reactor, Breeding capability, Doubling-time