31 mai 2015
Conformément à la réglementation, le réacteur a été conduit à l’arrêt suite à l’atteinte de la limite des 15 jours imposée pour une indisponibilité d’un groupe électrique diesel de secours. En effet, lors de son démarrage, les roulements du groupe ont chauffé malgré les travaux de réfection qui avaient été effectués.
Type : PWR - Puissance : 3 304 MWth - Première divergence : 01/1975
Available in english only.
Event Number : 51106
Facility : COOK - State : MI
Unit : [1] - RX Type : [1] W-4-LP
Event Date : 05/31/2015 - Event Time : 16:00
Emergency Class : NON EMERGENCY 10 CFR Section : 50.72(b)(2)(i) - PLANT S/D REQD BY TS
Initial PWR : 100 % Current PWR : 99 %
Event Text
TECHNICAL SPECIFICATION REQUIRED SHUTDOWN DUE TO FAILURE OF AN EMERGENCY DIESEL GENERATOR
"At 1600 [EDT] on May 31, 2015, [DC Cook] operations commenced a shutdown of DC Cook Unit 1 to comply with LCO 3.8.1 Condition G, when the 14 day limit to complete Condition B Required Action could not be met.
"At 0010 [EDT] on May 18, 2015, Unit 1 AB Emergency Diesel Generator was removed from service for planned maintenance. LCO 3.8.1 Condition B was entered which allows 14 days to restore diesel to operable.
"At 1049 [EDT] on May 21, 2015, Unit 1 AB Emergency Diesel Generator tripped during post maintenance testing due to high bearing temperatures. Subsequent actions to repair and restore the diesel to operable status have been unsuccessful.
"This event is reportable under 10 CFR 50.72(b)(2)(i), the initiation of any nuclear plant shutdown required by the plant’s Technical Specifications, as a four (4) hour report. The DC Cook Sr. Resident NRC Inspector has been notified."
Unit 1 is expected to be in Mode 5 by 2030 EDT on June 1, 2015. There is no impact on Unit 2.
* * * UPDATE FROM CHRIS PEAK TO JOHN SHOEMAKER ON 6/1/15 AT 1704 EDT * * *
"This update is to correct the information contained in the block titled ’Power/Mode After’. The power and mode after the event requiring notification (TECHNICAL SPECIFICATION REQUIRED SHUTDOWN DUE TO INABILITY TO RESTORE UNIT 1 AB EDG WITHIN THE COMPLETION TIME PRESCRIBED IN LCO 3.8.1 CONDITION B) was 99% power and mode 1.
"The licensee has notified the NRC Resident Inspector."
D.C. Cook Unit 1 is currently in Mode 3 and conducting a normal cooldown to Mode 4.
Notified R3DO (Passehl).
* * * UPDATE FROM CHRIS PEAK TO HOWIE CROUCH AT 0734 EDT ON 6/2/15 * * *
"DC Cook Unit 1 reactor was shut down (Mode 3) at 0231 hours [EDT] June 01, 2015 and achieved Mode 5 at 0410 hours [EDT] June 02, 2015 to comply with LCO 3.8.1 Condition G with all systems operating normally.
"The licensee has notified the NRC Resident Inspector."
https://www.nrc.gov/reading-rm/doc-collections/event-status/event/2015/20150603en.html#en51106
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