Due to main condenser tube damage in May, 2011, seawater flowed into the reactor and other facilities of Hamaoka NPS Unit 5. The pitting corrosion was observed in the SUS weld metal cladding layer, welded to the inner face of the RPV base metal. In terms of the availability of RPV’s required functions, RPV would be capable of continuous use based on component health assessment in December, 2015. However, development of non-destructive inspection methods to SUS weld metal cladding was needed to conduct the ...
英字タイトル:
Applicability of non-destructive inspection methods to SUS weld metal cladding

In the process of achieving cold shutdown following the shutdown of Hamaoka Nuclear Power Station Unit 5 on May 14, 2011, large quantities of seawater flowed into the reactor and other facilities due to main condenser tubes which had broken. The investigations focusing on corrosion of materials had been conducted through various methods, observation of equipments, material tests, cleaning tests, and inspection of RPV and its components. Based on these investigations, we had evaluated the impact on the ...
英字タイトル:
Effect of sea water intrusion from main condenser, damaged by break on reactor core internals, Hamaoka Unit 5 (No.3)