15 juin 2015
L’injection de sécurité a été enclenchée. L’arrêt s’est effectué correctement. L’enquête préliminaire a montré que le disjoncteur du bus électrique en anneau a été intentionnellement ouvert par le personnel de la centrale sur ordre de l’opérateur de district. Cette ouverture a entrainé l’arrêt de la turbine.
Type : PWR - Puissance : 3 216 MWth - Première divergence : 04/1976
Available in english only.
Event Number : 51156
Facility : INDIAN POINT - State : NY -
Unit : [3] - RX Type : [3] W-4-LP -
Event Date : 06/15/2015 - Event Time : 19:20 -
Emergency Class : NON EMERGENCY 10 CFR Section : 50.72(b)(2)(iv)(B) - RPS ACTUATION - CRITICAL 50.72(b)(3)(iv)(A) - VALID SPECIF SYS ACTUATION
Initial PWR : 100 % - Current PWR : 100 %
Event Text
REACTOR TRIP DUE TO TURBINE TRIP
"On June 15, 2015 at 1920 EDT, Indian Point Unit 3 received a Turbine trip which directly led to a Reactor trip. Operators entered [plant procedure] E-0, Reactor Trip or Safety Injection. All control rods fully inserted. All safety systems responded as expected. The Auxiliary Feedwater (AFW) system actuated as expected. Offsite power and electrical lineups are normal. No primary or secondary code safety valves lifted. All MSIVs are open and the Main Condensers are being used as the heat sink. The Reactor is in Mode 3 and stable. Unit 2 was unaffected and remains at 100% power. Preliminary investigation determined that Breaker Number 1 in the Ring Bus was intentionally opened [by plant personnel on switching orders from the district operator] due to a problem on W93 [output feeder from Ring Bus]. Subsequently Breaker #3 went open and caused a Turbine/Reactor trip of the Unit."
The licensee notified the NRC Resident Inspector.
* * * UPDATE FROM BOB WALPOLE TO DANIEL MILLS ON 6/16/15 AT 1320 EDT * * *
The licensee previously identified "a problem on W93" which was a mistake and should have been stated as "a problem on W97". All other information was stated correctly.
The NRC Resident Inspector has been notified.
https://www.nrc.gov/reading-rm/doc-collections/event-status/event/2015/20150617en.html#en51156