Research on the Thermal Stratification Phenomenon at the Secondary Side of a Steam Generator in an Isolated Loop

Xinxin Liu, Lei Yu, Jianli Hao () and Wenzhen Chen
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Xinxin Liu: College of Nuclear Science and Technology, Naval University of Engineering, Wuhan 430033, China
Lei Yu: College of Nuclear Science and Technology, Naval University of Engineering, Wuhan 430033, China
Jianli Hao: College of Nuclear Science and Technology, Naval University of Engineering, Wuhan 430033, China
Wenzhen Chen: College of Nuclear Science and Technology, Naval University of Engineering, Wuhan 430033, China

Energies, 2022, vol. 15, issue 21, 1-11

Abstract: In normal operation, there is no significant thermal stratification phenomenon in the tube bundle area of the steam generator of the nuclear power plant. However, this phenomenon is detected in marine nuclear power plant isolation loops in the presence of feedwater leakage. Therefore, an experiment was designed to verify the presence of thermal stratification, and the influence factors were analyzed by the RELAP5/MOD3.2 program. The results show that thermal stratification is mainly influenced by the initial water level at isolation, the initial pressure at isolation, the total leakage mass, and the internal circulation of the steam generator. Leakage flow has little effect on it. This phenomenon causes the coolant temperature at the primary side of the steam generator in the isolated loop to be lower than the temperature measured in the reactor inlet pipe or outlet pipe. This study aids the operator in determining the real coolant temperature at the primary side of the steam generator in the isolated loop and prevents reactivity insertion accidents when the isolated loop is put into operation.

Keywords: marine nuclear power plant; steam generator; thermal stratification (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
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