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th–u cycle performance analysis based on molten chloride salt and molten fluoride salt fast reactors

Nuclear Science and Techniques 2020年第8期31卷 116-128页

作者： Liao-Yuan He Shao-Peng Xia Xue-Mei Zhou Jin-Gen Chen Gui-Min Liu Yang Zou Rui Yan Shanghai Institute of Applied Physics Chinese Academy of SciencesShanghai 201800China CAS Innovative Academies in TMSR Energy System Chinese Academy of SciencesShanghai 201800China university of Chinese Academy of Sciences Beijing 100049China

the recent development of molten salt fast reactors has generated a renewed interest in them. As compared to traditional solid fuel 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 ***, 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, ***, 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.

关键词： th–u cycle Molten salt fast reactor Breeding capability Doubling time

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