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1.中国科学院上海应用物理研究所 嘉定园区 上海 201800
2.中国科学院先进核能创新研究院 上海 201800
3.中国科学院大学 北京 100049
Received:20 December 2017,
Revised:20 December 2017,
Published:10 July 2018
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Yipeng PENG, Chenggang YU, Deyang CUI, et al. Analysis of burnup performance for a molten chloride salt fast reactor based on thorium fuel[J]. Nuclear techniques, 2018, 41(7): 070602
Yipeng PENG, Chenggang YU, Deyang CUI, et al. Analysis of burnup performance for a molten chloride salt fast reactor based on thorium fuel[J]. Nuclear techniques, 2018, 41(7): 070602 DOI: 10.11889/j.0253-3219.2018.hjs.41.070602.
与氟盐堆相比,氯盐快堆具有超铀核素(Transuranics,TRU)溶解度更高、中子能谱更硬、熔点更低等方面的优势。基于熔盐嬗变堆(Molten Salt Actinide Recycler and Transmuter,MOSART)的堆芯结构,采用熔盐堆在线添料和后处理程序MSR-RS(Molten Salt Reactor Reprocessing Sequence)进行分析,针对氯盐快堆的熔盐组成、后处理方式等方面进行了优化,以利于提升其增殖及嬗变性能。首先分析了不同载体盐和启动燃料对燃耗性能的影响,提出了熔盐成分优化方案;然后引入离线批处理和在线连续处理两种后方式来提升燃耗性能。结果表明:在氯盐快堆中,高重金属溶解度的NaCl更适合作为载体盐;TRU中的次锕系核素(Minor Actinides,MA)有助于提升增殖性能;采用离线批处理能够达到较好的燃耗性能,降低对后处理系统的要求。优化后的堆芯燃耗时间延长到31 a,相应的燃耗深度提高至210 GW·d·t
-1
左右,
233
U的积累量达到8300 kg,并且最终消耗了约12000 kg的TRU,嬗变率为62.1%。
Background
2
Compared with the molten fluoride salt reactor
the molten chloride salt fast reactor (MCFR) has outstanding advantages in terms of transuranics (TRU) solubility
neutron spectrum and melting point
so it is very crucial to study neutron performances of the MCFR to evaluate its feasibility.
Purpose
2
This study aims to optimize the composition and reprocessing method of the molten salt to enhance the breeding and burnup performance of MCFR.
Methods
2
Based on the molten salt reactor reprocessing sequence (MSR-RS)
the effect of different carrier salt and starting fuel on burnup performance are analyzed and the composition of molten salt is optimized. Then
off-line batch reprocessing and on-line continuous reprocessing are introduced to improve burnup performance.
Results
2
After a series of optimization
the burnup-time is extended to 31 a
the burnup level is increased to 210GW·d·t
-1
the production of
233
U is 8300 kg
and finally 12000 kg of TRU is consumed corresponding to transmutation rate of 62.1%.
Conclusion
2
NaCl is a more suitable carrier salt for MCFR
and minor actinides (MA) in the TRU also helps to improve the breeding performance. Batch reprocessing can not only achieve great burnup performance but also reduces the requirement for the reprocessing system.
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