Nuclear Techniques ›› 2017, Vol. 40 ›› Issue (2): 20603-020603.doi: 10.11889/j.0253-3219.2017.hjs.40.020603

• NUCLEAR ENERGY SCIENCE AND ENGINEERING • Previous Articles     Next Articles

Model optimization and analysis of Th-U breeding based on MSFR

LI Guangchao1,2,3, ZOU Yang1,2,3, YU Chenggang1,2, SUN Jianyou1,2, CHEN Jingen1,2,3, XU Hongjie1,2,3   

  1. 1. Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Jiading Campus, Shanghai 201800, China;
    2. Innovative Academies in TMSR Energy System, Chinese Academy of Sciences, Shanghai 201800, China;
    3. University of Chinese Academy of Sciences, Beijing 100049, China
  • Received:2016-09-28 Revised:2016-12-19 Online:2017-02-10 Published:2017-01-24
  • Supported by:

    Supported by the Chinese TMSR Strategic Pioneer Science and Technology Project (No.XDA02010000), National Natural Science Foundation of China (No.91326201), the Frontier Science Key Program of Chinese Academy of Sciences (No.QYZDY-SSW-JSC016)

Abstract:

Background: As the only one of liquid fuel reactor among the six candidate reactors chosen by the Generation IV International Forum (GIF), Molten Salt Reactor (MSR) shows great potential for future nuclear energy and thorium usage, especially for Molten Salt Fast Reactor (MSFR) with characters of high Th-U Breeding Ratio (BR) and large negative Temperature Coefficient of Reactivity (TCR). Purpose: Th-U breeding capacity of MSFR is expected to be further improved for more 233U production and shorter Double Time (DT), and burn-up analysis is necessary to demonstrate the breeding characters with time, as well as TCR for safety. Methods: Based on SCALE6.1, three aspects are explored including fertile in radial direction, newly added fertile in axial direction and appended graphite reflector, followed with explanations from the point of nuclide reaction rate. Furthermore, burn-up analysis is carried out with time by using the self-developed code Molten Salt Reactor Reprocessing Sequence (MSR-RS) specifically for on-line reprocessing of MSR. Results: Initial BR of 1.17 is obtained when axial fertile is included, and about 50% of fertile salt is saved with graphite reflector. BR above 1.1 in equilibrium and DT of 36 a are achieved, and the production of 233U is about 133 kg·a-1, while TCR can be kept at about -6×10-5 K-1. Conclusion: Newly added axial fertile improves the BR obviously, while about half inventory of thorium can be saved with graphite reflector. The self-developed module MSR-RS is suitable for simulating the reprocessing of MSR, and 233U production for the optimized geometry increases markedly while TCR is kept negative enough at all the running time for safety.

Key words: MSFR, Geometry optimization, Th-U fuel breeding

CLC Number: 

  • TL426