Transient behavior of the sodium–potassium alloy heat pipe in passive residual heat removal system of molten salt reactor |
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| Affiliation: | 1. Department of Nuclear Science Technology, Xi''an Jiaotong University, No.28, Xianning West Road, Xi''an 710049, China;2. State Key Laboratory of Multiphase Flow in Power Engineering, Xi''an Jiaotong University, China;1. Key Laboratory of Thermal Science and Power Engineering of Ministry of Education, Department of Engineering Mechanics, Tsinghua University, Beijing 100084, China;2. Institute of Nuclear Physics and Chemistry (INCP), China Academy of Engineering Physics (CAEP), Mianyang 621900, China;1. MOE Key Laboratory of Enhanced Heat Transfer and Energy Conservation, and Beijing Key Laboratory of Heat Transfer and Energy Conversion, College of Environmental and Energy Engineering, Beijing University of Technology, Beijing 100124, China;2. National Institute of Metrology, Beijing 100013, China;1. Korea Aerospace University, School of Aerospace and Mechanical Engineering, 200-1 Hwajeon, Goyang 412-791, Korea;2. Korea Aerospace University, Graduate School, 200-1 Hwajeon, Goyang 412-791, Korea;3. Korea Institute of Energy Research, CSP Research Division, Yuseong, Daejeon305-343, Korea |
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| Abstract: | High temperature heat pipes, as highly-effective heat transfer elements, have been extensively employed in thermal management for their remarkable advantages in conductivity, isothermality and self-actuating. It is of significance to apply heat pipes to new concept passive residual heat removal system (PRHRS) of molten salt reactor (MSR). In this paper, the new concept PRHRS of MSR using sodium–potassium alloy (NaK) heat pipes is proposed in detail, and then the transient behavior of high temperature NaK heat pipe is numerically investigated using the Finite Element Method (FEM) in the case of MSR accident. The two-dimensional transient conduction model for the heat pipe wall and wick structure is coupled with the one-dimensional quasi-steady model for the vapor flow when vaporization and condensation occur at the liquid–vapor interface. The governing equations coupled with boundary conditions are solved by FORTRAN code to obtain the distributions of the temperature, velocity and pressure for the heat pipe transient operation. Numerical results indicated that high temperature NaK heat pipe had a good operating performance and removed the residual heat of fuel salt significantly for the accident of MSR. |
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| Keywords: | Molten salt reactor Passive residual heat removal system NaK heat pipe Transient simulation |
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