21 avril 2012
Une paire de vannes d’isolement a été découverte défaillante au cours de manœuvres de rechargement...Ces vannes sont prévues pour se fermer lorsque se manifeste un dégagement de radioactivité hors de l’enceinte.
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MAIN STEAM ISOLATION VALVES FAIL TO SHUT
Facility : HARRIS - Unit - Event Time : 05:15 [EDT]
Last Update Date : 04/21/2012
Emergency Class : NON EMERGENCY
ACCIDENT MITIGATION
At approximately 0515 EDT on April 21, 2012, the Harris Nuclear Plant [HNP] was in the process of a normal plant shutdown for a refueling outage. HNP was at 0% power in Mode 4. During OST-1046, MSIV Operability Test, ’B’ and ’C’ Main Steam Isolation Valves (MSIV), failed to close from the main control board.
At 0648 EDT an April 21, 2012 ’B’ MSIV shut immediately after the instrument air supply was isolated.
At 0938 EDT an April 21, 2012 ’C’ MSIV shut after the instrument air supply was isolated.
The cause of the equipment failure is not yet known but is currently being investigated. This report is being made in accordance with 10 CFR 50.72 (b)(3)(v)(C), inability to isolate and mitigate a radioactive release, and 10 CFR 50.72 (b)(3)(v)(D), a condition which could have prevented the fulfillment of a safety function to mitigate the consequences of an accident. The plant continues to remain shutdown at 0% power. Other equipment functioned as expected including the turbine isolation valves."
The licensee notified the NRC Resident Inspector.
https://www.nrc.gov/reading-rm/doc-collections/event-status/event/2012/20120423en.html
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