Leakage from cvcs pipe of regenerative heat exchanger induced by high-cycle thermal fatigue at tsuruga nuclear power station unit 2

摘要

On July 12, 1999 while Tsuruga-2, PWR 4-loop plant, wa soperating at full power (1, 160 MWe), unidentified leakage inside the primary containment vessel was detected. As the leakage was identified, the plant promptly started to proceed to cold shutdown. Visual inspection after an isolation of the CVCS (Chemical & Volume Control System) revealed that the leakage was from a connecting pipe betweent he middle and lower stages in the CVCS regenerative heat exchanger.