Startup scheme optimization and flow instability of natural circulation lead-cooled fast reactor SNCLFR-100

Wen-Shun Duan; Ze-Ren Zou; Xiao Luo; Hong-Li Chen

doi:10.1007/s41365-021-00970-3

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Startup scheme optimization and flow instability of natural circulation lead-cooled fast reactor SNCLFR-100

NUCLEAR ENERGY SCIENCE AND ENGINEERING | Updated：2021-12-06

- Startup scheme optimization and flow instability of natural circulation lead-cooled fast reactor SNCLFR-100
- Startup scheme optimization and flow instability of natural circulation lead-cooled fast reactor SNCLFR-100
- Nuclear Science and Techniques 2021年32卷第11期文章编号：133
- Affiliations：
  
  1.School of Nuclear Science and Technology, University of Science and Technology of China, Hefei 230027, China
- Author bio：
  
  hlchen1@ustc.edu.cn
- Funds：
- DOI：10.1007/s41365-021-00970-3
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Wen-Shun Duan, Ze-Ren Zou, Xiao Luo, 等. Startup scheme optimization and flow instability of natural circulation lead-cooled fast reactor SNCLFR-100[J]. Nuclear Science and Techniques, 2021,32(11):133

Wen-Shun Duan, Ze-Ren Zou, Xiao Luo, et al. Startup scheme optimization and flow instability of natural circulation lead-cooled fast reactor SNCLFR-100[J]. Nuclear Science and Techniques, 2021,32(11):133
Wen-Shun Duan, Ze-Ren Zou, Xiao Luo, 等. Startup scheme optimization and flow instability of natural circulation lead-cooled fast reactor SNCLFR-100[J]. Nuclear Science and Techniques, 2021,32(11):133 DOI： 10.1007/s41365-021-00970-3.

Wen-Shun Duan, Ze-Ren Zou, Xiao Luo, et al. Startup scheme optimization and flow instability of natural circulation lead-cooled fast reactor SNCLFR-100[J]. Nuclear Science and Techniques, 2021,32(11):133 DOI： 10.1007/s41365-021-00970-3.

摘要

Abstract

Owing to the inherent instability of the natural circulation system, flow instability can easily occur during the operation of a natural circulation lead-cooled fast reactor, especially during the startup phase. A comprehensive startup scheme for SNCLFR-100, including primary and secondary circuits, is proposed in this paper. It references existing more mature startup schemes in various reactor types. It additionally considers the restriction conditions on the power increase in other schemes and the characteristics of lead-based coolant. On this basis, the multi-scale coupling code ATHLET-OpenFOAM was used to study the flow instability in the startup phase under different power-step amplitudes and power duration times. The results showed that obvious flow instability phenomena were found in the different startup schemes, such as the short-term backflow phenomenon of the core at the initial time of the startup. Moreover, an obvious increase in the flow rate and temperature to the peak value at the later stage of a continuous power rise was observed, as well as continuous oscillations before reaching a steady state. It was determined that the scheme with smaller power-step amplitude and a longer power duration time requires more time to start the reactor. Nevertheless, it will be more conducive to the safe and stable startup of the reactor.

关键词

Keywords

Natural circulationlead-cooled fast reactorstartup schemeflow instabilitymulti-scale coupling

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