A Power Calibration Method for Plate Type Fuel Elements Used in Burnup Measurement

Abstract

The invention discloses a method for calibrating the power of a plate-type fuel element used for fuel consumption measurement, which calculates the flow rate of different coolants passing through an irradiation test device, and obtains the flow distribution coefficient of the inner and outer flow channels of the test section; uses the plate-type fuel element The nuclear power and the total heat release power of the test section are obtained to obtain the initial values ​​of the nuclear power of the fuel element core and the gamma heat release rate of each structural material, and the heat source and distribution in the test section are preliminarily determined, and the calculation model is established by using the geometric structure model; Iterative calculations determine the gamma heat release rate of the material; determine the nuclear power of the fuel element; determine the burnup of the fuel element. This method is used to determine the real-time burnup value of the test fuel element to ensure the realization of the fuel element burnup radiation index. Through certain analysis methods and methods, the influence of gamma heat release of structural materials is removed, and the heat balance method is used to reduce the fuel radiation. The error of the nuclear power of the fuel during the test, so as to realize the calibration of the nuclear power of the fuel during the irradiation test for the measurement of the burnup.

Description

technical field [0001] The invention relates to the technical field of research reactor fuel irradiation, in particular to a power calibration method for a plate-type fuel element used for burnup measurement. Background technique [0002] The performance of fuel elements is directly related to the safety and economy of research reactors. Carrying out in-stack irradiation tests of fuel elements is a key part of the research and development and design of fuel elements. The fuel element must pass the in-stack irradiation test, and the changes of various properties of the fuel element under irradiation conditions are studied to verify whether the comprehensive performance of the fuel element meets the requirements of use under different thermal-hydraulic working conditions and different burning times. [0003] In high-flux research reactors, special irradiation testing devices are generally used to conduct irradiation testing of fuel elements. According to the classification o...

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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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