Mehtod to manufacture mockup specimen for performance validation of nondestructive test about stress corrosion crack originated from PWR pressurizer heater sleeve nozzle in high temperature and pressure

摘要

operation of nuclear power generation to the present invention is the base Alloy 600 and Alloy 182 weld stress corrosion cracking in shape as much as possible relates to a process for preparing a specimen that can be closely simulated. ; in the step of welding the specimen preparation for Alloy 600 Alloy 182 and the electrode base material, and machining the central part of the test specimen with V shape, welding and After performing rework, welding performance is verified through the final specification check and radiographic examination. The second step of sensitizing heat treatment step, the corrosion resistance of the test piece dropped as a step in an object to for good stress corrosion cracking, and subjected to heat treatment under the condition determined according to the sensitizing chemical composition of the sample, determine the degree of heat treatment and performing an analysis to test. In establishing a third step of loading conditions was added to a tensile force to the specimen and select the appropriate load value through the stress distribution prediction. In the fourth step of painting the specimen and a probe (probe) installation step, the specimen to produce a crack in the desired position of the specimen subjected to painting operations to be locally exposed to an oxidizing solution, and the solution was injected into the sample window for the probe surface ( Install the window). The fifth step of generating the stress corrosion cracking step, injecting an oxidizing solution to the specimen, and at the same time applying a load selected at the third step, the step of adjusting the intensity of the load by the shape of the stress corrosion cracking diagnosis generate the desired size of the crack includes. The process according to the invention also uses the four-point bending load method to apply a tensile stress to the specimen.