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Event Notification Report for July 31, 2013

U.S. Nuclear Regulatory Commission
Operations Center

Event Reports For
07/30/2013 - 07/31/2013

** EVENT NUMBERS **


49223 49225

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Power Reactor Event Number: 49223
Facility: KEWAUNEE
Region: 3 State: WI
Unit: [1] [ ] [ ]
RX Type: [1] W-2-LP
NRC Notified By: DANIEL BACKUS
HQ OPS Officer: MARK ABRAMOVITZ
Notification Date: 07/30/2013
Notification Time: 08:40 [ET]
Event Date: 07/30/2013
Event Time: 06:35 [CDT]
Last Update Date: 07/30/2013
Emergency Class: NON EMERGENCY
10 CFR Section:
50.72(b)(3)(xiii) - LOSS COMM/ASMT/RESPONSE
Person (Organization):
STEVE ORTH (R3DO)

Unit SCRAM Code RX CRIT Initial PWR Initial RX Mode Current PWR Current RX Mode
1 N N 0 Defueled 0 Defueled

Event Text

TECHNICAL SUPPORT CENTER VENTILATION OUT OF SERVICE FOR PRE-PLANNED MAINTENANCE

"On July 30th, 2013 at 0635 CDT, the Kewaunee Power Station Technical Support Center (TSC) ventilation system was removed from service for planned maintenance. The removal of the ventilation system potentially affects the TSC habitability during a declared emergency requiring activation. The Emergency Response Organization (ERO) team has been notified of the maintenance and the possible need to relocate during an emergency. If an emergency is declared and the TSC ERO activation is required, the TSC will be staffed and activated unless the TSC becomes uninhabitable due to ambient temperatures, radiological, or other conditions. If relocation of the TSC staff becomes necessary, the Station Emergency Director will relocate the staff to an alternate TSC location. The ventilation system is expected to be out of service for approximately 5 hours.

"This condition is being reported in accordance with 10CFR50.72(b)(3)(xiii) as an event that results in a major loss of emergency assessment capability.

"The NRC Resident Inspector has been notified."


* * * UPDATE FROM DANIEL BACKUS TO DONALD NORWOOD AT 1550 EDT ON 7/30/2013 * * *

Maintenance was completed and the TSC was returned to service at 1430 CDT. The licensee notified the NRC Resident Inspector.

Notified R3DO (Orth).

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Power Reactor Event Number: 49225
Facility: GRAND GULF
Region: 4 State: MS
Unit: [1] [ ] [ ]
RX Type: [1] GE-6
NRC Notified By: CHARLES BROOKS
HQ OPS Officer: PETE SNYDER
Notification Date: 07/30/2013
Notification Time: 17:32 [ET]
Event Date: 07/30/2013
Event Time: 14:32 [CDT]
Last Update Date: 07/30/2013
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
Person (Organization):
THOMAS FARNHOLTZ (R4DO)

Unit SCRAM Code RX CRIT Initial PWR Initial RX Mode Current PWR Current RX Mode
1 A/R Y 100 Power Operation 0 Hot Shutdown

Event Text

REACTOR SCRAM DUE TO TURBINE GENERATOR TRIP

"Actuation of Reactor Protection System with reactor critical. Reactor Scram occurred at 1432 CDT on 7/30/2013 from 100% Power. The cause of the scram appears to be a Turbine Generator trip.

"05-S-01-EP-2, 'Reactor Pressure Vessel Control,' 05-1-02-I-1, 'Reactor Scram Off Normal Event Procedure,' and 05-1-02-I-2, 'Turbine and Generator Trip Off Normal Event Procedure,' were entered to mitigate the transient.

"No Loss of Off-site Power occurred. No Emergency Core Cooling System or Diesel Generator initiation occurred. Reactor Core Isolation Cooling initiated and injected. The lowest reactor water level reached was -36 inches wide range (RCIC initiation set point is -41.6 inches wide range).

"Main Steam Isolation Valves remained open and no Safety Relief Valves actuated. Currently, Main Turbine Bypass valves are controlling reactor pressure to the Main Condenser and Condensate and Feedwater is controlling reactor water level in the normal band and removing decay heat. There are no challenges to Primary or Secondary Containment.

"The NRC Senior Resident Inspector was notified."

* * * UPDATE FROM CHRIS ROBINSON TO PETE SNYDER AT 1841 EDT ON 7/30/13 * * *

The first out recorder indicated that RPS actuation signal was due to high reactor pressure as a result of the turbine control valves going shut. Notified R4DO (Farnholtz).

Page Last Reviewed/Updated Wednesday, July 31, 2013
Wednesday, July 31, 2013