Experimental study on transient performance in the coasting transition process of shutdown for reactor coolant pump

Lu, Yonggang; Zhu, Rong; Wang, Xiuli; An, Ce; Zhao, Yuanyuan

doi:10.1016/j.nucengdes.2019.03.007

Cited by 16 publications

(5 citation statements)

References 5 publications

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“…The lower the TKE value, the more stable the flow state in the fluid domain. 5,31 It can be seen that the high TKE region of the initial scheme on the meridian surface is mainly distributed in the diffuser fluid domain, especially at the turning area near the hub of the impeller and the turning area at inlet of the diffuser. After optimization, the high TKE region of the MCP is concentrated in the impeller fluid domain, especially in the meridian turning area of the near hub.…”

Section: Comparative Analysis Of Optimization Resultsmentioning

confidence: 97%

Shutdown idling performance of the nuclear main coolant pump under station blackout accident: An optimization study

Zhao

Batlló

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part A:

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Lead-cooled fast reactor (LFR) is an important reactor type of the Generation IV nuclear energy, and the main coolant pump (MCP) is the only and most critical power equipment in primary circuit of LFR. The shutdown idling performance of the MCP, is one of the most important safety indicators in the event of a station blackout accident. When the motor loses its power supply, the MCP needs to run under the inertia of the flywheel to ensure the coolant flow for a short time. This study mainly focuses on the idling mathematical model of the MCP under power failure accidents. In this study, taking the shutdown idling performance of the MCP as the optimization goal, the parametric optimization analysis of the impeller and diffuser structure of the MCP was carried out. Specifically, based on the platform ISIGHT, the software of CFturbo, TurboGrid, CFX, Matlab and FLOWMASTER are systematically integrated, the automated 3D modeling, automatic meshing and automatic CFD calculation of different hydraulic model of the MCP are realized. And the neural network mathematical model between the geometric parameters of MCP and the idling performance indicators is established. The study shows that there is a strong linear relationship between the idling performance of the MCP and its head and shaft power, and meridian parameters of Δβ 2, Z 1, Φ 1h and the radial surface parameters of Δβ 1 and Δβ 2, Z 1 and Φ 1h have the greatest impact on the idling performance of MCP.

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Section: Comparative Analysis Of Optimization Resultsmentioning

confidence: 97%

Shutdown idling performance of the nuclear main coolant pump under station blackout accident: An optimization study

Zhao

Batlló

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part A:

Self Cite

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“…Fu et al (2020) conducted experimental and numerical studies of the transient characteristics during the start-up process of the axial flow pump. Lu et al (2019) used different models of RCP to carry out transient performance test research of RCP during shutdown coasting transition. Zhong (2018) built the transient test system of RCP shaft sticking accident, and calculated the transient flow of RCP shaft sticking accident by bidirectional fluid structure coupling.…”

Section: Introductionmentioning

confidence: 99%

Study on Hydraulic Characteristics of Reactor Coolant Pump Shutdown Transition Process Based on Primary Circuit Closed System

Zhang

et al. 2022

Front. Energy Res.

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According to the structural characteristics of a steam generator and a reactor pressure vessel, the reactor primary circuit system of HPR1000 is simplified to make the reactor coolant pump (RCP) characteristics match the resistance characteristics of the system pipeline, so a simplified model of reactor primary circuit closed system is formed. On this basis, the RCP shutdown accident in a single circuit of the reactor is numerically simulated. Results show that the pressure in the pipeline system has changed greatly compared. The flow rate drops rapidly and decreases to 1.7% of stable operation at 10s. The torque drops sharply to −51.89% of stable operation, and then rises slowly to zero. The pressure at the inlet and outlet of the impeller changes dramatically which leads to the change of blade load and the velocity in the impeller passage decreases gradually. The pressure and velocity in the guide vane continue to decrease.

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“…In terms of the in uence of geometric parameter changes on the performance of the RCP, Lu and Wang [9] [10] studied the idling performance of RCP in the process of power failure through experimental methods, and analyzed the pressure pulsation characteristics at the outlet of the volute by using wavelet transform.…”

Section: Introductionmentioning

confidence: 99%

Study on the influence of guide vane angle on performance characteristics of reactor coolant pump during idling

Zhai

Luo

et al. 2022

Preprint

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In order to study the influence of different guide vane angle variation on performance characteristics of reactor coolant pump (RCP) during idling process, the external characteristics of RCP model with five different guide vane angles at idling process state were analyzed. Radial force characteristics and blade load characteristics of RCP were analyzed. The results show that the head and torque changes of pump with different guide vane angles in different idle period are consistent. The head of DY1model (Guide vane angle increases sharply first and then decreases gently, which convexity is large) is the highest and torque is small. The head drop rate of DY5 model (Guide vane decreases first and then increases, and the concavity is large) is the highest and torque is the largest. With the idling, the radial force of impeller and guide vane decreases gradually. The radial force of DY5 model impeller is small and the fluctuation range is weak. The radial force of DY4 model（Guide vane shows concavity change with gentle increase）impeller before idling is the largest. In the nonlinear transition of idle period, the total radial force of DY4 model is 235N when idling for 32s, which is nearly 30 times lower than that before idling, and the radial force decreases the most. In different idling periods, the radial force amplitude of guide vane of DY5 model is the largest, and the radial force decrease amplitude of guide vane of DY4 model is the largest in the whole idling period. The impeller blade load of DY4 and DY5 model pumps with concavity guide vane angle change law is significantly higher than that of other model pumps after the relative position of streamline is 0.6. When the relative position of the guide vane along the streamline direction is less than 0.5, the load fluctuation of the guide vane of each model pump is large. when the relative position is greater than 0.5, the blade load fluctuation is relatively small.

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Experimental study on transient performance in the coasting transition process of shutdown for reactor coolant pump

Cited by 16 publications

References 5 publications

Shutdown idling performance of the nuclear main coolant pump under station blackout accident: An optimization study

Shutdown idling performance of the nuclear main coolant pump under station blackout accident: An optimization study

Study on Hydraulic Characteristics of Reactor Coolant Pump Shutdown Transition Process Based on Primary Circuit Closed System

Study on the influence of guide vane angle on performance characteristics of reactor coolant pump during idling

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