Event Notification Report for September 07, 2001
U.S. Nuclear Regulatory Commission
Operations Center
EVENT REPORTS FOR
09/06/2001 - 09/07/2001
Power Reactor
Event Number: 38269
Facility: LASALLE
Region: 3 State: IL
Unit: [] [2] []
RX Type: [1] GE-5,[2] GE-5
NRC Notified By: MICHAEL FITZPATRICK
HQ OPS Officer: FANGIE JONES
Region: 3 State: IL
Unit: [] [2] []
RX Type: [1] GE-5,[2] GE-5
NRC Notified By: MICHAEL FITZPATRICK
HQ OPS Officer: FANGIE JONES
Notification Date: 09/07/2001
Notification Time: 03:30 [ET]
Event Date: 09/07/2001
Event Time: 00:24 [CDT]
Last Update Date: 09/07/2001
Notification Time: 03:30 [ET]
Event Date: 09/07/2001
Event Time: 00:24 [CDT]
Last Update Date: 09/07/2001
Emergency Class: NON EMERGENCY
10 CFR Section:
50.72(b)(2)(iv)(B) - RPS ACTUATION - CRITICAL
10 CFR Section:
50.72(b)(2)(iv)(B) - RPS ACTUATION - CRITICAL
Person (Organization):
MARK RING (R3)
MARK RING (R3)
| Unit | SCRAM Code | RX Crit | Initial PWR | Initial RX Mode | Current PWR | Current RX Mode |
|---|---|---|---|---|---|---|
| 2 | M/R | Y | 72 | Power Operation | 0 | Hot Shutdown |
MANUAL REACTOR SCRAM DUE TO 2 LOW PRESSURE HEATER STRINGS ISOLATING
The following is taken from a facsimile report:
This report is being made per 10CFR50.72(b)(2)(iv)(B) RPS actuation (scram) (4 hour notification for U-2).
At 12:24 AM CDT, Friday 9/7/01, U-2 was manually scrammed. The initiating event was a loss of 2 of 3 Low Pressure Feedwater Heater Strings. A high level condition was initially received in the 21A Low Pressure Heater, which caused the Condensate System inlet and outlet isolation valves to the 2A Low Pressure Heater String to close. Subsequently, a high level condition was also received in the 21C Low Pressure Heater, which caused the Condensate System inlet and outlet isolation valves to the 2C Low Pressure Heater String to close. With a second Low Pressure Heater String isolated, Unit 2 was manually scrammed in accordance with LaSalle Procedure LOA-HD-201, "Heater Drain System Trouble".
All systems operated as designed. There were no ECCS actuations or Primary Containment isolations. The lowest Reactor level reached was minus 20 inches (141 inches above the top of active fuel) and was recovered to normal level using feedwater. Reactor pressure responded normally. No Safety Relief Valves actuated. All Control Rods fully inserted.
The NRC Resident Inspector has been notified.
The cause of the Low Pressure Heater String loss is being investigated at this time.
The following is taken from a facsimile report:
This report is being made per 10CFR50.72(b)(2)(iv)(B) RPS actuation (scram) (4 hour notification for U-2).
At 12:24 AM CDT, Friday 9/7/01, U-2 was manually scrammed. The initiating event was a loss of 2 of 3 Low Pressure Feedwater Heater Strings. A high level condition was initially received in the 21A Low Pressure Heater, which caused the Condensate System inlet and outlet isolation valves to the 2A Low Pressure Heater String to close. Subsequently, a high level condition was also received in the 21C Low Pressure Heater, which caused the Condensate System inlet and outlet isolation valves to the 2C Low Pressure Heater String to close. With a second Low Pressure Heater String isolated, Unit 2 was manually scrammed in accordance with LaSalle Procedure LOA-HD-201, "Heater Drain System Trouble".
All systems operated as designed. There were no ECCS actuations or Primary Containment isolations. The lowest Reactor level reached was minus 20 inches (141 inches above the top of active fuel) and was recovered to normal level using feedwater. Reactor pressure responded normally. No Safety Relief Valves actuated. All Control Rods fully inserted.
The NRC Resident Inspector has been notified.
The cause of the Low Pressure Heater String loss is being investigated at this time.
Power Reactor
Event Number: 38273
Facility: COOPER
Region: 4 State: NE
Unit: [1] [] []
RX Type: [1] GE-4
NRC Notified By: WILLIAM GREEN
HQ OPS Officer: BOB STRANSKY
Region: 4 State: NE
Unit: [1] [] []
RX Type: [1] GE-4
NRC Notified By: WILLIAM GREEN
HQ OPS Officer: BOB STRANSKY
Notification Date: 09/10/2001
Notification Time: 23:13 [ET]
Event Date: 09/07/2001
Event Time: 17:54 [CDT]
Last Update Date: 09/10/2001
Notification Time: 23:13 [ET]
Event Date: 09/07/2001
Event Time: 17:54 [CDT]
Last Update Date: 09/10/2001
Emergency Class: NON EMERGENCY
10 CFR Section:
50.72(b)(3)(v)(D) - ACCIDENT MITIGATION
10 CFR Section:
50.72(b)(3)(v)(D) - ACCIDENT MITIGATION
Person (Organization):
MARK SHAFFER (R4)
MARK SHAFFER (R4)
| Unit | SCRAM Code | RX Crit | Initial PWR | Initial RX Mode | Current PWR | Current RX Mode |
|---|---|---|---|---|---|---|
| 1 | N | Y | 100 | Power Operation | 62 | Power Operation |
LOSS OF OFFSITE POWER SOURCES DUE TO LIGHTNING
"On 9/7/01 at 1750 CDT the Startup Transformer was de-energized due to a lightning strike on the transmission system. This deenergized one of the two off-site circuits. This trip resulted in the trip of 'A' Recirculation M/G set and subsequent single loop operations. Shortly after this at 1754 CDT the Emergency Transformer was declared inoperable due to degraded voltage and the plant entered the Limiting Condition for Operations for loss of both off-site power circuits. Both Emergency Diesels remained available and the unit remained on line. All plant equipment responded as expected. At 1932 CDT the Emergency Transformer was returned to operable status. Two loop operations were restored at 0521 CDT on 9/8/01. The Startup Transformer was restored to operable at 1045 CDT on 9/8/01. Full power operation was restored at 2100 CDT on 9/8/01. The NRC Senior Resident Inspector has been notified. This event is reportable in accordance with NUREG 1022 Rev. 2 and 10 CFR 50.72(b)(3)(v). Staff review of the event and NUREG 1022 Rev. 2 on 9/10/01 identified the need to make a report under 10 CFR 50.72."
"On 9/7/01 at 1750 CDT the Startup Transformer was de-energized due to a lightning strike on the transmission system. This deenergized one of the two off-site circuits. This trip resulted in the trip of 'A' Recirculation M/G set and subsequent single loop operations. Shortly after this at 1754 CDT the Emergency Transformer was declared inoperable due to degraded voltage and the plant entered the Limiting Condition for Operations for loss of both off-site power circuits. Both Emergency Diesels remained available and the unit remained on line. All plant equipment responded as expected. At 1932 CDT the Emergency Transformer was returned to operable status. Two loop operations were restored at 0521 CDT on 9/8/01. The Startup Transformer was restored to operable at 1045 CDT on 9/8/01. Full power operation was restored at 2100 CDT on 9/8/01. The NRC Senior Resident Inspector has been notified. This event is reportable in accordance with NUREG 1022 Rev. 2 and 10 CFR 50.72(b)(3)(v). Staff review of the event and NUREG 1022 Rev. 2 on 9/10/01 identified the need to make a report under 10 CFR 50.72."