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Reduced-order method for nuclear reactor primary circuit calculation

Nuclear Science and Techniques 2024年第11期35卷 28-45页

作者： Ze-Long Zhao Ya-Hui Wang Zhe-Xian Liu Hong-Hang Chi Yu Ma Sino‑French Institute of Nuclear Engineering and Technology Sun Yat-sen UniversityZhuhai 519082China

Accurate real-time simulations of nuclear reactor circuit systems are particularly important for system safety analysis and *** effectively improve computational efficiency without reducing accuracy,this study establishes a thermal-hydraulics reduced-order model(ROM)for nuclear reactor circuit *** full-order circuit system calculation model is first established and verified and then used to calculate the thermal-hydraulic properties of the circuit system under different states as *** proper orthogonal decomposition method is used to extract the basis functions from snapshots,and the ROM is constructed using the least-squares method,effectively reducing the difficulty in constructing the ROM.A comparison between the full-order simulation and ROM prediction results of the AP1000 circuit system shows that the proposed ROM can improve computational efficiency by 1500 times while achieving a maximum relative error of 0.223%.This research develops a new direction and perspective for the digital twin modeling of nuclear reactor system circuits.

关键词： Reactor system model primary circuit Reduced-order Proper orthogonal decomposition Least-squares method

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Research and practice of overpressure protection system for EPR primary hydrostatic test

Research and practice of overpressure protection system for ...

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第三十九届中国控制会议

作者： Xiaoning Yuan Kejing Zhou Xiangqian Yan Jun Liang State Key Laboratory of Nuclear Power Safety Monitoring Technology and Equipment China Nuclear Power Engineering Co. Ltd Daya Bay Nuclear Power Operations And Management Co. Ltd State Key Lab of Industrial Control Technology College of Control Science and Engineering Zhejiang University

According to the requirements of design and construction rules for mechanical components of pressurized water reactor nuclear islands, the primary hydrostatic test must be carried out before and after the operation of nuclear power plant. The overpressure protection system is used to prevent the accidental overpressure of the primary circuit during the hydrostatic test, and to alleviate the serious consequences of overpressure on the involved test equipment. The system design and equipment selection for the primary circuit of the third generation nuclear power plants are much different from that of the second generation ones. In addition, the construction of the third generation nuclear power plants is too late to have the reference experience. Based on the control characteristics of the primary process system in European pressurized water reactor and the deficiency of the overpressure protection system in china pressurized water reactor, the research work is conducted from the hereafter aspects, the pressure control strategy of the primary hydrostatic test, scheme design of the overpressure protection system, commissioning and site application. And it is also applied in the primary hydrostatic test of a nuclear power plant. The practical results show that the implementation principle of the overpressure protection system is correct, the analysis of risks and various countermeasures is appropriate, and the implementation scheme is feasible. The research work and practice can provide some reference for the subsequent project construction.

关键词： Hydrostatic test overpressure protection system European pressurized water reactor primary circuit nuclear power plant

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