Self-powered detector three-dimensional measuring point arrangement optimization method based on Kriging model

Abstract

The invention discloses a self-powered detector three-dimensional measuring point arrangement optimization method based on a Kriging model, and the method comprises the steps: considering the influence of a self-powered detector measuring point position set in a nuclear reactor monitoring system on a spatial estimation value of a non-measuring point position, and calculating a spatial covariance between specific positions of the monitoring system; calculating a weight function, a penalty factor and a Kriging variance of a non-measuring point position according to the spatial covariance; on the basis of a simulated annealing process, searching a minimum value which takes a Kriging variance average value of a non-measuring-point position set as an objective function, and optimizing an arrangement scheme of the self-powered detector according to the minimum value; the measuring point arrangement optimization method can effectively reduce uncertainty of estimated parameters, is high in universality, is suitable for various nuclear reactor monitoring systems, can be used for evaluating a current self-powered detector measuring point arrangement scheme and recommending measuring point optimization design, and provides a new method for reactor core design of the self-powered detector.

Description

technical field [0001] The invention relates to the field of nuclear reactor core design and core neutron detectors, in particular to a method for optimizing the three-dimensional measuring point arrangement of a self-sufficient energy detector based on a kriging model. Background technique [0002] A series of operating parameters of the nuclear reactor core are important data related to the safety and economy of the nuclear power plant. Represented by the core power distribution, the power peak factor and deviation from nucleate boiling factor directly affect the safety limit of the nuclear power plant; at the same time, the power distribution determines the output capacity of the nuclear power plant, providing the most direct work for the operator. reference index. In a nuclear reactor, the core power distribution is reflected by the neutron flux density. As the core parameter of the nuclear reactor system, the size of the neutron flux density also determines various nuc...

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Problems solved by technology

This method considers the effect of different detector layout schemes on the reconstruction error of core parameters such as neutron flux density or power distribution level, and selects the optimal design based on the minimization of reconstruction error. This method is limited by the measurement value Acquisition, in the practice of new reactor types, high-precision simulation of the measurement process is often required, which has great difficulties and uncertainties; at the same time, this method cannot ignore the influence of relative power coefficients and detector calibration coefficients at different measuring point positions , and these parameters are constantly changing during core operation

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