Evaluation method for wear rate of reactor core finger sleeve

Abstract

The invention discloses an evaluation method for wear rate of a reactor core finger sleeve. The method comprises the following steps: acquiring wear defect depth data of the finger sleeve through eddy current detection; calculating wear rate data according to the wear defect depth data; according to the wear rate data, obtaining an empirical distribution function of the eddy current detection wear rate and distribution of the actual wear rate; obtaining distribution of the eddy current detection errors according to the eddy current detection errors; calculating according to the distribution of the actual wear rate and the distribution of the eddy current detection error to obtain an empirical distribution function of an eddy current detection wear rate simulation value; and comparing the two empirical distribution functions, and carrying out iterative calculation until the two empirical distribution functions are matched to obtain the distribution of the corrected actual wear rate. The wear rate of the finger sleeve is evaluated according to the evaluation method, the abrasion trend and the service state of the finger sleeve can be mastered more accurately, and safe and reliable operation of a nuclear power station is facilitated.

Description

technical field [0001] The invention relates to the technical field of evaluation of casing wear defects, in particular to an evaluation method for measuring the wear rate of casing core neutron flux of a CRP1000 unit. Background technique [0002] The finger thimble is the channel of the mobile miniature fission chamber, and it is an important part of the neutron flux measurement system of the reactor core of the nuclear power plant. It means that the outer wall of the casing is in direct contact with the reactor coolant, which belongs to the pressure boundary of the primary circuit. The finger sleeves are small in diameter and long in size, resulting in low stiffness. During the service process, due to the vibration induced by the coolant, there will be friction between the nozzle of the guide pipe, and then wear and tear will occur, which will bring the risk of coolant leakage in the primary circuit and affect the safe operation of the nuclear power plant. [0003] At p...

AI Technical Summary

Problems solved by technology

Finger sleeves are small in diameter and long in size resulting in low stiffness

During the service process, due to the vibration induced by the coolant, there will be friction between the nozzle of the guide pipe, and then wear and tear will occur, which will bring the risk of coolant leakage in the primary circuit and affect the safe operation of the nuclear power plant.

[0003] At present, the industry mainly uses the Bobbin probe eddy current testing method to regularly track and inspect the wear defects of the finger casing, but there is a technical gap in the field of finger casing wear evaluation technology

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