浜岡原子力発電所５号機 ディーゼル発電機(B)排気管伸縮継手破損事象に関する原因調査について
概要
In June 2018, the leakage of gases around the exhaust pipe attached to emergency diesel generator of Hamaoka Nuclear power plant Unit 5 and the breakage of an exhaust pipe expansion joint were found. As a result of investigation, we estimated that the cause of the event were the hit marks on the bellows of the expansion joint and low cycle fatigue caused by usual operation of the generator. It was estimated that the hit marks were made when the expansion joint was installed to the exhaust pipe. This paper shows the outline of the event and investigations about the cause of breakage of the exhaust pipe expansion joint.
