16 février 2017
Un fusible grillé est à l’origine de l’indisponibilité d’alimentation électrique de ce circuit d’injection. Ce dernier n’aurait pas pu intervenir pour atténuer les conséquences d’un problème grave. Malgré le remplacement du fusible, le système est resté inopérant suite à l’accumulation d’autres problèmes.
Type : Fukushima I (BWR Mark I) - Puissance : 3 458 MWth - Première divergence : 08/76
Available in english only
Event Number : 52557
Facility : BROWNS FERRY
State : AL Unit : [2] - RX Type : [1] GE-4,[2] GE-4,[3] GE-4
Event Date : 02/16/2017 - Event Time : 10:52 [CST]
Emergency Class : NON EMERGENCY 10 CFR Section : 50.72(b)(3)(v)(D) - ACCIDENT MITIGATION Person (Organization) : BRIAN BONSER (R2DO)
Initial PWR : 77 % Current PWR : 77 %
Event Text
HPCI SYSTEM INOPERABLE DUE TO BLOWN FUSE
"On February 16, 2017 at 1052 CST, Unit 2 received a High Pressure Coolant Injection (HPCI) System 120V Power Failure alarm. Troubleshooting identified a cleared fuse for the HPCI System Flow Controller, 2-FIC-73-33, which would have prevented automatic or manual HPCI System initiation and rendered the HPCI System inoperable. At 1145 CST, the cleared fuse was replaced and the HPCI system was declared available. The HPCI System remains inoperable for additional troubleshooting.
"This constitutes an unplanned HPCI System inoperability and requires an 8 hour ENS notification in accordance with 10 CFR 50.72(b)(3)(v)(D), due to the failure of a single train system affecting accident mitigation and a 60 day written report in accordance with 10 CFR 50.73(a)(2)(v)(D).
"The Senior NRC Resident Inspector has been notified."
https://www.nrc.gov/reading-rm/doc-collections/event-status/event/2017/20170217en.html#en52557
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