ENS 41558: Difference between revisions

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Latest revision as of 22:21, 1 March 2018

v t e ENS Event
19:02 Apr 1, 2005
Title	Emergency Diesel Generator Start Due to a Partial Loss of Offsite Power
Event Description	The following information was provided by the licensee via fax (licensee text in quotes): With the plant in mode 6 and refueling operations in progress, a loss of offsite power circuit 751 occurred. This loss of power caused an undervoltage condition on safeguards busses 16 and 17 and an automatic start of Emergency Diesel Generator 1B. Both of these busses were subsequently energized by the diesel. Refueling operations in progress were immediately halted. Core cooling was momentarily interrupted and restored upon safeguards bus reenergization. The spent fuel pool cooling loop in operation was powered from the opposite train and hence was not interrupted. RCS temperature was maintained at 74 degrees Fahrenheit and spent fuel pool temperature was also at 74 degrees Fahrenheit throughout the event. This partial loss of power was due to a substation transformer fault (one of two offsite power sources were lost). The licensee notified the NRC Resident Inspector.

ENS 41558 +/-
Where
Ginna New York (NRC Region 1)
Reporting

10 CFR 50.72(b)(3)(iv)(A), System Actuation
Time - Person (Reporting Time:+-2.53 h-0.105 days <br />-0.0151 weeks <br />-0.00347 months <br />)
Opened:	Kevin Mclaughlin 16:30 Apr 1, 2005
NRC Officer:	Mark Abramovitz
Last Updated:	Apr 1, 2005
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v • d • e

v t e Emergency Notification System
Ginna with 10 CFR 50.72(b)(3)(iv)(A), System Actuation
WEEKMONTHYEAR2023-09-09T15:43:00 [Table view]
[ENS list for Ginna]

@@ Line 16: / Line 16: @@
 | event date = 04/01/2005 14:02 EST
 | last update date = 04/01/2005
-| title = Emergency Diesel Generator Start Due To A Partial Loss Of Offsite Power
+| title = Emergency Diesel Generator Start Due to a Partial Loss of Offsite Power
 | event text = The following information was provided by the licensee via fax (licensee text in quotes):
 With the plant in mode 6 and refueling operations in progress, a loss of offsite power circuit 751 occurred.  This loss of power caused an undervoltage condition on safeguards busses 16 and 17 and an automatic start of Emergency Diesel Generator 1B.  Both of these busses were subsequently energized by the diesel.  Refueling operations in progress were immediately halted.  Core cooling was momentarily interrupted and restored upon safeguards bus reenergization.  The spent fuel pool cooling loop in operation was powered from the opposite train and hence was not interrupted.  RCS temperature was maintained at 74 degrees Fahrenheit and spent fuel pool temperature was also at 74 degrees Fahrenheit throughout the event.