原子力発電所における新保全技術としてのテンパービード工法の開発・適用
R/D and implement of temper bead welding as newly developed maintenance technique in nuclear power plant
著者:
平野 伸朗 Shinro HIRANO 瀬良 健彦 Takehiko SERA 千種 直樹 Naoki CHIGUSA 沖村 浩司 Koji OKIMURA 西本 和俊 Kazutoshi NISHIMOTO
発刊日:
公開日:
Ambient temper bead weldingNo action letterNuclear Power PlantsQualificationRNP
概要
Japanese government has recently addressed a policy to increase capacity factor of existing nuclear PPs to achieve the goal to decrease the emission of CO2. Numerous preventive measures have taken in nuclear power plants to minimize the risk of unexpected long shutdown. Newly developed mitigation measures or repair methods need to be qualified to satisfy regulatory standards, before it is implemented to nuclear power plants. The qualification process needs to comply regulatory standards though it may consume time to go through each of the required steps. This paper describes such cases namely ambient temper-bead welding and clarifies the issues that need to be resolved regarding qualification process. The qualification process for new methods that has not been prescribed in regulatory standards temporarily completed by go through confirm testing by JAPEIC, RNP and issuance of no action letter in rush. Currently, the qualification process can only be applied on limited area so generalized qualification process needs to be established.
