26 mars 2018
Cette vanne unique a été repérée en panne suite à la montée en pression du générateur de vapeur. Le réacteur doit impérativement être mis à l’arrêt, arrêt qui a démarré 6 h 27 après la découverte du problème.
Note : au moment du problème, le réacteur était bien à 100 % de sa puissance et non zéro comme indiqué dans le rapport de la NRC ci-dessous.
Type : PWR - Puissance : 2 775 MWTh - Première divergence : 08/1977
Available in english only.
Event Number : 53290
Facility : FARLEY - State : AL
Unit : [1] - RX Type : [1] W-3-LP-
Event Date : 03/26/2018 - Event Time : 13:38 [CDT]
Emergency Class : NON EMERGENCY 10 CFR Section : 50.72(b)(2)(i) - PLANT S/D REQD BY TS Person (Organization) : STEVE ROSE (R2DO)
Initial PWR : 0 % Current PWR : 0 %
Event Text
TECHNICAL SPECIFICATIONS REQUIRED SHUTDOWN DUE TO INOPERABLE MAIN STEAM ISOLATION VALVE
"On March 25, 2018 at 1833 CDT, while at 100 percent power, Farley Unit 1 (FNP-1) conservatively declared a single Main Steam Isolation Valve (MSIV) inoperable on the 1C Steam Generator line due to indication of Steam Generator pressure rise with a corresponding reduction in flow of that loop. FNP-1 began a reactor shutdown at 0400 CDT on March 26, 2018 to establish plant conditions to support testing the affected main steam line MSIVs while in the required action time of Technical Specification 3.7.2. At 1338 CDT on March 26, 2018, testing confirmed that the single MSIV was inoperable and that valve disassembly will be required. The duration of the valve repair would exceed the required action time of Technical Specification 3.7.2. This report is being made in accordance with 10 CFR 50.72(b)(2)(i), as a plant shutdown required by technical specifications.
"The licensee has notified the NRC Resident Inspector."
https://www.nrc.gov/reading-rm/doc-collections/event-status/event/2018/20180327en.html