Method and device for detecting sealing structure of electric heating element of pressurized water reactor nuclear power plant voltage stabilizer

Abstract

The invention discloses a method for detecting the tightness structure of an electric heating element of a voltage stabilizer in a pressurized water reactor nuclear power plant, comprising the following steps: S1, using an end plug-outer shell weld helium leak detection device to perform helium leak detection on the end plug-outer shell weld ; S2. After the electric heating element (5) is manufactured, use the integral helium leak detection device to conduct integral helium leak detection on the product. Also disclosed is an end plug-outer cladding weld helium leak detection device used in a method for detecting the sealing structure of an electric heating element of a pressurized water reactor nuclear power plant voltage stabilizer. The beneficial effects of the invention are: it is convenient to timely remove products with welding structure defects and leakage defects in the production process, ensuring that the products installed in the equipment meet the technical requirements; the technical scheme is rigorously designed, and the leak detection results are reliable; the device is uniquely designed and easy to operate , which not only meets the quality inspection requirements of the product, but also ensures the integrity of the product.

Description

technical field [0001] The invention relates to the technical field of sealing detection of electric heating elements of voltage stabilizers, in particular to a method and a device for detecting the sealing structure of electric heating elements of voltage stabilizers in pressurized water reactor nuclear power plants. Background technique [0002] The voltage regulator is an important equipment at the pressure boundary of the primary circuit of the PWR nuclear power plant, and is mainly used to control the pressure of the primary circuit coolant system of the reactor. When the pressure of the primary loop coolant system of the reactor is lower than the normal value, more electric heating elements will be put into operation to vaporize the water in the lower space of the pressure stabilizer and enter the steam space of the pressure stabilizer, so that the system pressure will rise back to the required value. Therefore, the electric heating function is the primary function of ...

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Problems solved by technology

[0005] Chinese patent CN103471780A discloses a sealing container end cap weld detection system and detection method, and proposes the idea of ​​using helium leak detection to detect the sealing performance of the weld seam. The structure of the plug-outer shell weld seam is quite different. At the same time, because the helium flow ejected from the nozzle is scattered and mixed with a certain amount of air, the concentration of helium is reduced, and the direction of the ejected air flow cannot be completely aligned. In addition, the air in the notch will reduce the concentration of helium entering the leak, so the traditional helium injection method has low sensitivity and high uncertainty in test results.

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