22 décembre 2017
Cette déclaration d’indisponibilité fait suite à la découverte d’une fuite sur la ligne de débit minimal à un niveau de 60 gouttes par minute. La fuite a été isolée et le système placé en sécurité. Ce circuit d’injection à haute pression est un système de sécurité unique. Sa défaillance pourrait empêcher l’accomplissement d’une fonction de sécurité nécessaire à l’atténuation des conséquences d’un accident.
Type : BWR Mark 3 - Puissance : 3 758 MWth - Première divergence : 8 / 1986 -
Available in english only
Event Number : 53137
Facility : PERRY - State : OH Unit : [1] - RX Type : [1] GE-6
Event Date : 12/22/2017 - Event Time : 23:48 [EST]
Emergency Class : NON EMERGENCY 10 CFR Section : 50.72(b)(3)(v)(D) - ACCIDENT MITIGATION
Initial PWR : 100 % Current PWR : 100 %
Event Text HIGH PRESSURE CORE SPRAY SYSTEM DECLARED INOPERABLE
"High Pressure Core Spray System was declared inoperable due to the discovery of a through-wall leak on the Minimum Flow line. Leak rate is 60 drops per minute from ASME Class 2 Piping. The leak has been isolated and the High Pressure [Core Spray] System has been placed in Secured Status.
"High Pressure Core Spray is considered a single train safety system. Inoperability of [the] High Pressure Core Spray System is considered an event or condition that at the time of discovery could have prevented the fulfillment of the safety function of structures or systems that are needed to mitigate the consequences of an accident.
"This event is being reported in accordance with 10 CFR 50.72(b)(3)(v)(D).
"The NRC Senior Resident Inspector was notified."
Technical Specifications Limiting Condition for Operation 3.5.1 Condition B was entered, requiring restoration of the High Pressure Core Spray System in 14 days.
The licensee plans to notify State and Local Governments (Lake, Geauga, and Ashtabula Counties).
https://www.nrc.gov/reading-rm/doc-collections/event-status/event/2017/20171226en.html
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