Soundness Assessment Method for Concrete Structures Based on Data Obtained from Deccommissioning Hamaoka NPP

In Japan, more than 10 nuclear power plants have been in operation for over 30 years, and the importance of maintaining and managing has been increased in addition to the design and construction. Regarding the maintenance and management of nuclear structures, we perform visual testing and soundness assessment by destructive testing in order to maintain the functions and related performance required during the service period of nuclear power plants. However, in a running plant, since obtaining concrete cores will damage the structure, a reasonable soundness assessment that minimizes the number of cores is desired. Therefore, in this research, we will obtain concrete cores from Hamaoka Unit-1, the decommissioning plant, to create a concrete database of material properties. We also employ nondestructive testing and numerical analysis method to construct a better soundness assessment method with minimized damages of the structure. (author)