5 février 2012
Le système d’injection de sécurité haute pression - qui interviendrait suite à un problème de fuite primaire - ne garantissait pas un système de flux stable ainsi qu’une pression de refoulement correcte pour ce circuit primaire. Ce système aurait pu ne pas être opérationnel en cas de nécessité et le refroidissement du réacteur n’aurait pas été assuré.
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Facility : BRUNSWICK
Unit : [1]
Event Date : 05/02/2012
Event Time : 17:58 [EDT]
Emergency Class : NON EMERGENCY
Event Text HIGH PRESSURE COOLANT INJECTION INOPERABLE DUE TO ERRATIC GOVERNOR OPERATION
"On 5/2/2012 at 1758 EDT, the Unit 1 High Pressure Coolant Injection (HPCI) System was declared inoperable in accordance with Technical Specification 3.5.1 due to the flow controllers inability to maintain stable system flow and discharge pressure. This failure was discovered during the high steam pressure operability run (i.e., within 48 hours of achieving adequate test pressure following a scheduled refueling/maintenance outage) required by Technical Specification Surveillance 3.5.1.7 following refueling outage B119R1.
"This report is being made in accordance with 10 CFR 50.72(b)(3)(v)(D), as a condition that at the time of discovery could have prevented the fulfillment of the safety function of systems that are needed to mitigate the consequences of an accident.
"The safety significance of this event is considered minimal. The Reactor Core Isolation Cooling (RCIC) system, Automatic Depressurization System (ADS) and Low Pressure Emergency Core Cooling Systems (ECCS) remain operable at this time. Actions have been taken to protect redundant safety systems.
"The NRC Resident Inspector has been notified."
https://www.nrc.gov/reading-rm/doc-collections/event-status/event/2012/20120503en.html
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