Analysis of Multi-branch Natural Circulation Characteristics of Passive Residual Heat Removal System in NHR200-Ⅱ Reactor

Geng Yiwa; Liu Xiongbin; Li Xiaotian; Zhang Yajun

doi:10.13832/j.jnpe.2023.06.0063

Volume 44 Issue 6

Dec. 2023

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Article Navigation > Nuclear Power Engineering > 2023 > 44(6): 63-70

Geng Yiwa, Liu Xiongbin, Li Xiaotian, Zhang Yajun. Analysis of Multi-branch Natural Circulation Characteristics of Passive Residual Heat Removal System in NHR200-Ⅱ Reactor[J]. Nuclear Power Engineering, 2023, 44(6): 63-70. doi: 10.13832/j.jnpe.2023.06.0063

Citation:

Geng Yiwa, Liu Xiongbin, Li Xiaotian, Zhang Yajun. Analysis of Multi-branch Natural Circulation Characteristics of Passive Residual Heat Removal System in NHR200-Ⅱ Reactor[J]. Nuclear Power Engineering, 2023, 44(6): 63-70. doi: 10.13832/j.jnpe.2023.06.0063

Citation:

Geng Yiwa, Liu Xiongbin, Li Xiaotian, Zhang Yajun. Analysis of Multi-branch Natural Circulation Characteristics of Passive Residual Heat Removal System in NHR200-Ⅱ Reactor[J]. Nuclear Power Engineering, 2023, 44(6): 63-70. doi: 10.13832/j.jnpe.2023.06.0063

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Analysis of Multi-branch Natural Circulation Characteristics of Passive Residual Heat Removal System in NHR200-Ⅱ Reactor

doi: 10.13832/j.jnpe.2023.06.0063

Institute of Nuclear and New Energy Technology, Tsinghua University, Beijing, 100084, China

Received Date: 2023-02-16
Rev Recd Date: 2023-04-12

Available Online: 2023-12-11

Publish Date: 2023-12-15

Abstract

Abstract

There is uneven flow distribution in multi-branch natural circulation system. In order to further analyze the flow characteristics of the system, a simplified mathematical model of multi-branch parallel-channel natural circulation loop was established based on the passive residual heat removal system (PRHR) system of the NHR200-Ⅱ reactor test facility. The mechanism of the reverse flow phenomenon was analyzed by utilizing the pressure drop-flow rate diagram, and the effects of various factors on the number of reverse flow branches were discussed. The analysis results show that the thermal power of PRHR system is deteriorated as the reverse flow occurred, and increasing the elevation between the primary heat exchanger (PHE) and the air cooler (RHE) can suppress the reverse flow in the PHE branches. There is a critical elevation. When the elevation is less than the critical value, changing the resistance of PHE or RHE branches will not change the number of reverse flow PHE branches. When the elevation is greater than the critical value, increasing the resistance of PHE branches or decreasing the resistance of RHE branches can reduce the number of reverse flow branches until the reverse flow is completely suppressed.
- Parallel channels,
- Natural circulation,
- Passive residual heat removal system (PRHR),
- Reverse flow

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References(21)

References

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