Quality control of in-service inspection in nuclear island
During the refueling outages of PWRs, ISI in nuclear island will contribute to find the equipment degradation generated during its normal operation, which can lay a foundation for the safe operation of nuclear power plant. ISI of nuclear island equipment was carried out from two sides: implementation and management. A detailed process of nondestructive testing and quality control during the preparation stage, project implementation stage and postsession integration stage was presented in accordance with the project procedures. Main responsibilities of quality control personnel stand out in the whole process.
Management Process and Human reliability Analysis of In-service Inspection for the Mechanical Components in PWRs
Based on the management strategy of in-service inspection, emphatically analysing the human reliability of in-service inspection persons, aimed at improving the management system and raising the management level for in-service inspection for the Mechanical components in PWRs.
The micro-mechanical behaviour of artificially cemented sand particles under compression and shear
The mechanical behaviour of cemented sands at macro-scale has been widely studied in the past, while there is still a lack of laboratory test data for the micro-mechanical response. Therefore, a series of uniaxial compression and tangential shear tests on artificially cemented sand particles have been conducted using a microscope to observe their behaviour. First, the consistency of cemented particles with different cementing agents is discussed. Three breakage modes are proposed according to the images taken using a microscope camera. A new parameter named ‘local roundness at contact’ is introduced to emphasise the effect of contact morphology on sample strength. Moreover, the effect of bond thickness on the mechanical response of cemented particles has been investigated. Finally, the shear strength parameters of artificially cemented sand samples have been determined for two different sample diameters.