Study on Characteristics of Xi’an Pulsed Reactor in Reflood Stage

Wang Ziming; Fu Junsen; Xiao Yao; Tian Xiaoyan; Su Chunlei; Li Da; Gu Hanyang

doi:10.13832/j.jnpe.2024.03.0060

Volume 45 Issue 3

Jun. 2024

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Wang Ziming, Fu Junsen, Xiao Yao, Tian Xiaoyan, Su Chunlei, Li Da, Gu Hanyang. Study on Characteristics of Xi’an Pulsed Reactor in Reflood Stage[J]. Nuclear Power Engineering, 2024, 45(3): 60-67. doi: 10.13832/j.jnpe.2024.03.0060

Citation:

Wang Ziming, Fu Junsen, Xiao Yao, Tian Xiaoyan, Su Chunlei, Li Da, Gu Hanyang. Study on Characteristics of Xi’an Pulsed Reactor in Reflood Stage[J]. Nuclear Power Engineering, 2024, 45(3): 60-67. doi: 10.13832/j.jnpe.2024.03.0060

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Study on Characteristics of Xi’an Pulsed Reactor in Reflood Stage

doi: 10.13832/j.jnpe.2024.03.0060

1.
School of Nuclear Science and Engineering, Shanghai Jiao Tong University, Shanghai, 200240, China
2.
Northwest Institute of Nuclear Technology, Xi'an, 710024, China

Received Date: 2023-08-14
Rev Recd Date: 2023-10-23
Publish Date: 2024-06-13

Abstract

Abstract

Reflood process is an important part of LOCA, and it is crucial to identify the transient thermal characteristics of core during reflood process for the safety analysis of break accident. Based on the subchannel analysis code CTF, the transient analysis and calculation are carried out for the reflood process of Xi'an pulsed reactor in typical large and small break loss of coolant accidents. In the analysis, the core is divided into eight channels based on power. The spatiotemporal distribution characteristics of the quenching front and core temperature are obtained, and the temperature changes of the cladding and fuel rod center at different heights of fuel rods at different positions are analyzed. The results show that the temperature of the outer fuel rods is lower and completely cooled earlier than that of the hottest rod at the center. Under both large and small break conditions, the coolant can completely submerge the core, allowing it to cool completely. Under large break conditions, due to higher decay power, it takes longer for the core to be completely cooled. The risk of cladding failure is relatively low under large break conditions, while the risk of cladding failure in small break accidents is higher compared to large break conditions. Fuel pellet melting will not occur under both large and small break conditions.
- Pulsed reactor,
- Reflood,
- Core temperature,
- Subchannel code,
- Safety features

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References(20)

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