Method for constructing and controlling turbulence form of fluid inside reactor pressure vessel

By constructing and controlling turbulent flow patterns in the reactor pressure vessel, the problem of difficulty in optimizing the flow channel geometry in the reactor and slowing down the low-frequency oscillation of fuel components in the prior art is solved, and the control of core core power fluctuations and the safety of reactor operation is improved.

WO2025066875A1 Publication Date: 2025-04-03CHINA NUCLEAR POWER ENGINEERING COMPANY LTD +2
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Patent Information

Application Number
PCT/CN2024/117604
Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
Priority Date
2024-04-23
Filing Date
2024-09-06
Publication Date
2025-04-03

AI Technical Summary

Technical Problem

The prior art is difficult to optimize the flow channel geometry in the reactor pressure vessel through reasonable means, build and control the turbulent flow pattern in the bottom chamber of the reactor pressure vessel, thereby improving the impact of fluid on the vibration behavior of fuel components and mitigating or eliminating the low-frequency oscillation of fuel components.

Method used

By establishing a three-dimensional structure model of the reactor pressure vessel, conducting flow field analysis or experiments, obtaining dynamic flow field and turbulence data, constructing a turbulence pattern, and by adjusting the three-dimensional structure of the reactor pressure vessel, repeat the above steps until the core core power fluctuation amplitude value falls into the target range.

Benefits of technology

The construction and control of the turbulent flow patterns inside the reactor pressure vessel is achieved, which reduces the low-frequency oscillation of the fuel assembly, reduces the wear of the core lattice, and ensures the safety of reactor operation.

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Abstract

A method for constructing and controlling a turbulence form of a fluid inside a reactor pressure vessel. The method comprises: step S1, obtaining related data of vortexes, a temporal distribution characteristic, a spatial distribution characteristic and a power spectral density of turbulence in an inlet area of each fuel assembly, and a turbulence energy spectrum; step S2, obtaining a water gap change situation of each fuel assembly, and on the basis of the water gap change situation of each fuel assembly, determining whether a three-dimensional flow field model of each fuel assembly needs to be corrected, until a water gap of each fuel assembly does not change; step S3, obtaining a reactor core nuclear power fluctuation amplitude value between fuel assemblies; and step S4, determining whether the reactor core nuclear power fluctuation amplitude value falls within a target range, and if the reactor core nuclear power fluctuation amplitude value does not fall within the target range, changing a three-dimensional structure inside a reactor pressure vessel until the reactor core nuclear power fluctuation amplitude value falls within the target range. The method for constructing and controlling a turbulence form of a fluid inside a reactor pressure vessel can eliminate or ameliorate the nuclear power fluctuation of a reactor core, reduce the wear of grids of the reactor core, and ensure the safety of reactor operation.
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