Plate-fuel-element power calibration method for fuel consumption measurement

Abstract

The invention discloses a plate-fuel-element power calibration method for fuel consumption measurement. The flow quantity of different coolants passing through an irradiation test device is calculatedfor obtaining flow distribution coefficients of inner and outer flow channels of a test section; the nuclear power of a plate fuel element and the total heat release power of the test section are utilized for obtaining initial values of the nuclear power of fuel element cores and the gamma heat release rate of each structural material, and the heat source and the distribution in the test sectionare preliminarily determined; a geometric structure model is utilized for building a calculation model; the gamma heat release rate of the material is determined through iterative calculation; the nuclear power of the fuel element is determined; and the fuel consumption of the fuel element is determined. The method is used for determining real-time fuel consumption values of the test fuel element,so that the fuel consumption irradiation index of the fuel element can be realized. The influence of the gamma release heat of the structural material is stripped through a certain analysis mean andmethod, and the error of the fuel nuclear power is reduced when fuel consumption in a fuel irradiation test is measured by a thermal balance method, so that the calibration of the fuel nuclear power in the irradiation test process of the fuel consumption measurement is realized.

Description

technical field [0001] The invention relates to the technical field of research reactor fuel irradiation, in particular to a method for calibrating the power of a plate-type fuel element for burnup measurement. Background technique [0002] The performance of fuel elements is directly related to the safety and economics of research reactors. Carrying out in-pile irradiation tests of fuel elements is a key part of the research and development and design of fuel elements. Fuel elements must be tested by in-core irradiation, and the changes in various properties of fuel elements under irradiation conditions are studied to verify whether their comprehensive performance meets the requirements of use under different thermal and hydraulic conditions and different burnups. [0003] In high-throughput research reactors, special radiation test devices are generally used to conduct radiation test research on fuel elements. According to the classification of the irradiation method, th...

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Problems solved by technology

[0007] The technical problem to be solved by the present invention is that the heat release of each structural material in the test section accounts for a relatively high share of the total heat release in the test section during the irradiation test of the existing plate-type fuel element, and it is difficult to determine the nuclear power of the test fuel element by using a simple heat balance method , so that the burnup of fuel elements cannot be obtained by accumulating the nuclear power of fuel elements, the purpose is to provide a power calibration method for plate-type fuel elements for burnup measurement

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