Event Notification Report for April 29, 2007
U.S. Nuclear Regulatory Commission
Operations Center
EVENT REPORTS FOR
04/28/2007 - 04/29/2007
EVENT NUMBERS
43324
!!!!! THIS EVENT HAS BEEN RETRACTED !!!!!
!!!!! THIS EVENT HAS BEEN RETRACTED !!!!!
Power Reactor
Event Number: 43324
Facility: KEWAUNEE
Region: 3 State: WI
Unit: [1] [] []
RX Type: [1] W-2-LP
NRC Notified By: DAVE KARST
HQ OPS Officer: BILL HUFFMAN
Region: 3 State: WI
Unit: [1] [] []
RX Type: [1] W-2-LP
NRC Notified By: DAVE KARST
HQ OPS Officer: BILL HUFFMAN
Notification Date: 04/29/2007
Notification Time: 17:48 [ET]
Event Date: 04/29/2007
Event Time: 15:26 [CDT]
Last Update Date: 06/19/2007
Notification Time: 17:48 [ET]
Event Date: 04/29/2007
Event Time: 15:26 [CDT]
Last Update Date: 06/19/2007
Emergency Class: NON EMERGENCY
10 CFR Section:
50.72(b)(2)(i) - PLANT S/D REQD BY TS
10 CFR Section:
50.72(b)(2)(i) - PLANT S/D REQD BY TS
Person (Organization):
DAVE PASSEHL (R3)
DAVE PASSEHL (R3)
| Unit | SCRAM Code | RX Crit | Initial PWR | Initial RX Mode | Current PWR | Current RX Mode |
|---|---|---|---|---|---|---|
| 1 | N | Y | 100 | Power Operation | 89 | Power Operation |
TECHNICAL SPECIFICATION SHUTDOWN DUE TO BOTH EMERGENCY DIESELS DECLARED INOPERABLE
"At 1453, [the licensee] declared D/G [Emergency Diesel Generator] - A inoperable due to outside air temperature exceeding 78.2 degrees Fahrenheit and entered Technical Specification 3.7.b.2 [which has a] 7-day LCO. At 1526, outside air temperature increased to greater than 81.4 degrees Fahrenheit and D/G - B was declared inoperable. With both D/Gs declared inoperable, Technical Specification 3.0.c , Standard Shutdown Sequence was entered. No other safety related components are inoperable at this time. Plant shutdown was initiated at 1624 on 4/29/07."
Based on recent findings by the licensee, the EDGs may not be capable of generating the minimum electrical power output needed to support a safety bus when outside air temperature exceeds certain limits (Operability Determination 151 dated April 26, 2007) The licensee is in the process of making ventilation modifications that will correct this condition. The licensee expects that the temperatures will drop below the EDG inoperability limits before the plant actually shuts down.
The licensee notified the NRC Resident Inspector.
* * * RETRACTION ON 06/19/07 AT 1515 ET FROM JACK BADZALA TO MACKINNON * * *
"EN 43324 provided notification of initiation of a unit shutdown due to both emergency diesel generators (EDGs) being declared inoperable due to outside air temperature exceeding allowable limits. Unit shutdown had been initiated per Technical Specification (TS) 3.0.c, Standard Shutdown Sequence, due to TS 3.7 not being met.
"A subsequent engineering evaluation allowed for increasing the allowable limit for outside ambient air temperature at which the EDGs are operable. The highest outside ambient air temperature recorded on 04/29/2007 (83.5 F) did not exceed the new allowable limit. Therefore, based on the new evaluation, both EDGs remained operable. TS 3.7 remained met and no TS shutdown was required. Consequently, this condition did not meet any reportability criteria in 10 CFR 50.72.
"As a result, the notification made on 4/29/07 (EN 43324) is hereby retracted." NRC R3DO (Patrick Louden) notified.
The NRC Resident Inspector was notified of this retraction by the licensee.
"At 1453, [the licensee] declared D/G [Emergency Diesel Generator] - A inoperable due to outside air temperature exceeding 78.2 degrees Fahrenheit and entered Technical Specification 3.7.b.2 [which has a] 7-day LCO. At 1526, outside air temperature increased to greater than 81.4 degrees Fahrenheit and D/G - B was declared inoperable. With both D/Gs declared inoperable, Technical Specification 3.0.c , Standard Shutdown Sequence was entered. No other safety related components are inoperable at this time. Plant shutdown was initiated at 1624 on 4/29/07."
Based on recent findings by the licensee, the EDGs may not be capable of generating the minimum electrical power output needed to support a safety bus when outside air temperature exceeds certain limits (Operability Determination 151 dated April 26, 2007) The licensee is in the process of making ventilation modifications that will correct this condition. The licensee expects that the temperatures will drop below the EDG inoperability limits before the plant actually shuts down.
The licensee notified the NRC Resident Inspector.
* * * RETRACTION ON 06/19/07 AT 1515 ET FROM JACK BADZALA TO MACKINNON * * *
"EN 43324 provided notification of initiation of a unit shutdown due to both emergency diesel generators (EDGs) being declared inoperable due to outside air temperature exceeding allowable limits. Unit shutdown had been initiated per Technical Specification (TS) 3.0.c, Standard Shutdown Sequence, due to TS 3.7 not being met.
"A subsequent engineering evaluation allowed for increasing the allowable limit for outside ambient air temperature at which the EDGs are operable. The highest outside ambient air temperature recorded on 04/29/2007 (83.5 F) did not exceed the new allowable limit. Therefore, based on the new evaluation, both EDGs remained operable. TS 3.7 remained met and no TS shutdown was required. Consequently, this condition did not meet any reportability criteria in 10 CFR 50.72.
"As a result, the notification made on 4/29/07 (EN 43324) is hereby retracted." NRC R3DO (Patrick Louden) notified.
The NRC Resident Inspector was notified of this retraction by the licensee.