Host: The Japan Society of Mechanical Engineers
Name : Proceedings of FDR2022 International Topical Workshop on Fukushima Decommissioning Research
Date : October 14, 2022 - October 17, 2022
To complete the decommissioning of the Fukushima Daiichi Nuclear Power Station (referred to as 1F), it is necessary to maintain damaged components and equipment in a safe state for medium and long term. The subcommittee of structural integrity of components was established in 2019 as a subcommittee of Review Committee on Decommissioning of the 1F of the Atomic Energy Society of Japan. The purpose of this subcommittee is to discuss the structural integrity evaluation standards for components and equipment that have partially lost their strength due to a severe accident, and to propose a concept on appropriate standards.
Target components and equipment are the reactor primary containment vessel (referred to as PCV) and its internal structure, e.g.: the pedestal of unit 1 to 3. Therefore, it is necessary to consider not only the required functions specific to the damaged components and equipment, which should be different from an operating plant, and also the magnitude of uncertainty in evaluating structural integrity. The subcommittee has been discussing concepts of structural integrity evaluation considering large uncertainties. This paper describes the concept on structural integrity evaluation for 1F.
