Multiscale reactor core thermal hydraulic analysis method

Abstract

The invention provides a multiscale reactor core thermal hydraulic analysis method. The method comprises the following steps of: 1, carrying out reactor core thermal hydraulic calculation through a reactor core sub-channel analysis program; 2, determining a position and an area range of a reactor core key area; 3, determining a boundary condition of a reactor core CFD analysis area; 4, carrying out CFD calculation on the reactor core key area; 5, arranging the CFD calculation result ad analyzing states of thermal hydraulic important parameters of the reactor core key area; 6, arranging the CFDcalculation result and optimizing a calculation model and a conservation equation source item of the sub-channel program; 7, updating a thermal hydraulic calculation model and a conservation equationsource item, in the reactor core key area, of the sub-channel program; 8, repeating the steps 1 to 5 via the updated sub-channel program; and 9, comparing important parameter values of the key area in two adjacent key area CFD calculations so as to judge whether convergence is carried out or not. The method is capable of comprehensively ensuring the accuracy and efficiency of thermal hydraulic state prediction for reactor cores.

Description

technical field [0001] The present invention relates to a method for simulating the thermal-hydraulic state of the reactor core of a nuclear power plant, specifically a method for predicting the thermal-hydraulic state of the nuclear power plant reactor core by combining the thermal-hydraulic multi-scale state analysis program of the nuclear power plant reactor core Technical method. Background technique [0002] The safety and economy of nuclear power plants are affected by the technical level of nuclear reactor core thermal hydraulic state prediction. The refined thermal-hydraulic computational fluid dynamics (CFD) program of the reactor core can simulate the heat transfer and flow of the reactor core on a detailed spatial scale. This kind of simulation is conducive to reducing the safety margin, supporting the power increase of the power station and the extension of the fuel cycle, ensuring the safety of the power station, and improving the economy of the power station. ...

AI Technical Summary

Problems solved by technology

However, the sub-channel program analysis is not as precise as CFD analysis, and cannot analyze the flow field distribution information in the cell-scale area of ​​the core, and the calculation and analysis depend on the empirical correlation of heat transfer and flow model coefficients

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