Preliminary study of parameter uncertainty influence on Pressurized Water Reactor core design |
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| Affiliation: | 1. School of Nuclear Science and Technology, Xi''an Jiaotong University, Xi''an 710049, China;2. State Key Laboratory on Power Engineering and Multiphase Flow, Xi''an Jiaotong University, Xi''an 710049, China;1. Department of Physics and Astrophysics, Uppsala University, Sweden;2. University of California, Berkeley, USA;1. School of Nuclear Science and Engineering, Shanghai Jiao Tong University, 800 Dong Chuan Road, Shanghai, China;2. Institute of Fusion and Reactor Technology, Karlsruhe Institute of Technology (KIT), Kaiserstrasse 12, 76131 Karlsruhe, Germany;1. School of Physical Sciences, University of Science and Technology of China, Hefei, Anhui 230027, China;2. Institute for Neutron Physics and Reactor, Karlsruhe Institute of Technology, Eggenstein-Leopoldshafen, 76344, Germany |
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| Abstract: | Sub-channel analysis can improve the accuracy of reactor core thermal design. However, the important initial parameters contain various uncertainties during reactor operation. In this work, the Sub-channel Analysis Code of Supercritical reactor (SACOS) code, which is also applicable for Pressurized Water Reactor (PWR), was used to study the coolant flow characteristic and fuel rod heat transfer characteristic of 1/8 assembly which has the maximum linear power density in 300 MWe PWR core firstly. Then the Wilks' method and Response Surface Method (RSM) were utilized to determine the influence of sub-channel input parameters uncertainties on the highest temperature of reactor core fuel rod and Minimum Departure from Nucleate Boiling Ratio (MDNBR). The results show that in the most conservative conditions, the maximum temperature of the fuel rod and MDNBR were 2167.4 °C and 1.08, respectively. Considering the uncertainties of assembly inlet flow rate, inlet coolant temperature and system pressure, the 95% probability values (with 95% confidence) of fuel rod maximum and MDNBR calculated using response surface methodology were 2144.0 °C and 1.6, while they were 2137 °C and 1.74 calculated by Wilks' approach. Results show that the uncertainty analysis methods can provide larger reactor design criteria margin to improve the economy of reactor. Furthermore, the code was developed to have the capacity to perform the uncertainty study of sub-channel calculation. |
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| Keywords: | Uncertainty study Sub-channel analysis Wilks' method Response surface method Pressurized Water Reactor |
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