Event Notification Report for September 25, 2010
U.S. Nuclear Regulatory Commission
Operations Center
EVENT REPORTS FOR
09/24/2010 - 09/25/2010
Power Reactor
Event Number: 46279
Facility: LASALLE
Region: 3 State: IL
Unit: [] [2] []
RX Type: [1] GE-5,[2] GE-5
NRC Notified By: JOHN KEENAN
HQ OPS Officer: BILL HUFFMAN
Region: 3 State: IL
Unit: [] [2] []
RX Type: [1] GE-5,[2] GE-5
NRC Notified By: JOHN KEENAN
HQ OPS Officer: BILL HUFFMAN
Notification Date: 09/25/2010
Notification Time: 10:24 [ET]
Event Date: 09/25/2010
Event Time: 02:10 [CDT]
Last Update Date: 09/25/2010
Notification Time: 10:24 [ET]
Event Date: 09/25/2010
Event Time: 02:10 [CDT]
Last Update Date: 09/25/2010
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):
RICHARD SKOKOWSKI (R3DO)
RICHARD SKOKOWSKI (R3DO)
| Unit | SCRAM Code | RX Crit | Initial PWR | Initial RX Mode | Current PWR | Current RX Mode |
|---|---|---|---|---|---|---|
| 2 | N | Y | 100 | Power Operation | 100 | Power Operation |
HIGH PRESSURE CORE SPRAY SYSTEM ROOM COOLING FANS FOUND NOT OPERATING
"This report is being made pursuant to 10 CFR 50.72(b)(3)(v)(D), event or condition that could have prevented fulfillment of a safety function needed to mitigate the consequences of an accident. During steady state operations 2VD05C, Division 3 Switchgear Room / Core Standby Cooling System (CSCS) Pump Room Supply Fan and 2VD07C, Division 3 Switchgear Room / Core Standby Cooling System (CSCS) Pump Room Return Fan were found not operating. Division 3 ventilation supplies cooling to the High Pressure Core Spray System (HPCS), which is a single-train system. At the time of this discovery, there was not assurance that the HPCS would fulfill its safety function without mitigating manual actions due to the fan failure, and thus this condition is reportable. Operators are now briefed to manually operate the fan if needed to maintain proper temperature conditions until maintenance begins, thus restoring system function."
The licensee has notified the NRC Resident Inspector.
"This report is being made pursuant to 10 CFR 50.72(b)(3)(v)(D), event or condition that could have prevented fulfillment of a safety function needed to mitigate the consequences of an accident. During steady state operations 2VD05C, Division 3 Switchgear Room / Core Standby Cooling System (CSCS) Pump Room Supply Fan and 2VD07C, Division 3 Switchgear Room / Core Standby Cooling System (CSCS) Pump Room Return Fan were found not operating. Division 3 ventilation supplies cooling to the High Pressure Core Spray System (HPCS), which is a single-train system. At the time of this discovery, there was not assurance that the HPCS would fulfill its safety function without mitigating manual actions due to the fan failure, and thus this condition is reportable. Operators are now briefed to manually operate the fan if needed to maintain proper temperature conditions until maintenance begins, thus restoring system function."
The licensee has notified the NRC Resident Inspector.
Power Reactor
Event Number: 46280
Facility: MONTICELLO
Region: 3 State: MN
Unit: [1] [] []
RX Type: [1] GE-3
NRC Notified By: RYAN RICHARDS
HQ OPS Officer: BILL HUFFMAN
Region: 3 State: MN
Unit: [1] [] []
RX Type: [1] GE-3
NRC Notified By: RYAN RICHARDS
HQ OPS Officer: BILL HUFFMAN
Notification Date: 09/25/2010
Notification Time: 11:30 [ET]
Event Date: 09/25/2010
Event Time: 02:57 [CDT]
Last Update Date: 09/25/2010
Notification Time: 11:30 [ET]
Event Date: 09/25/2010
Event Time: 02:57 [CDT]
Last Update Date: 09/25/2010
Emergency Class: NON EMERGENCY
10 CFR Section:
50.72(b)(3)(xiii) - LOSS COMM/ASMT/RESPONSE
10 CFR Section:
50.72(b)(3)(xiii) - LOSS COMM/ASMT/RESPONSE
Person (Organization):
RICHARD SKOKOWSKI (R3DO)
RICHARD SKOKOWSKI (R3DO)
| Unit | SCRAM Code | RX Crit | Initial PWR | Initial RX Mode | Current PWR | Current RX Mode |
|---|---|---|---|---|---|---|
| 1 | N | Y | 95 | Power Operation | 95 | Power Operation |
LOSS OF ERDS, SPDS AND TSC PHONE LINES DUE TO UNINTERUPTABLE POWER SUPPLY FAILURE
"On 9/25/10 at approximately 0237 CDT, the site experienced a loss of the Uninterruptable Power Supply UPS Y91. This resulted in a loss of power to the Safety Parameter Display System (SPDS) and site computer servers which disabled the Emergency Response Data System (ERDS). In addition, in-house Technical Support Center (TSC) telephones were lost [the NRC phone lines in the TSC are still available] rendering the TSC non-functional. The alternate TSC is functional and will be used, if needed, to implement the Emergency Plan (EOF Phones were unaffected). Alternate assessment capability is fully functional and will meet necessary requirements to implement the Emergency Plan. Troubleshooting efforts are underway. This event is reportable under 10 CFR 50.72(b)(3)(xiii)."
The licensee stated that the Y91 UPS supplies a non-vital 125 volt dc bus and has no safety impact on plant operation and is not subject to any technical specification LCO.
The NRC Resident Inspector has been notified.
* * * UPDATE FROM MARTIN RAJKOWSKI TO PETE SNYDER AT 1656 ON 9/25/10 * * *
All equipment noted as out of service above has been returned to service as of 1541 CDT on 9/25/10.
Notified R3DO (Skokowski).
"On 9/25/10 at approximately 0237 CDT, the site experienced a loss of the Uninterruptable Power Supply UPS Y91. This resulted in a loss of power to the Safety Parameter Display System (SPDS) and site computer servers which disabled the Emergency Response Data System (ERDS). In addition, in-house Technical Support Center (TSC) telephones were lost [the NRC phone lines in the TSC are still available] rendering the TSC non-functional. The alternate TSC is functional and will be used, if needed, to implement the Emergency Plan (EOF Phones were unaffected). Alternate assessment capability is fully functional and will meet necessary requirements to implement the Emergency Plan. Troubleshooting efforts are underway. This event is reportable under 10 CFR 50.72(b)(3)(xiii)."
The licensee stated that the Y91 UPS supplies a non-vital 125 volt dc bus and has no safety impact on plant operation and is not subject to any technical specification LCO.
The NRC Resident Inspector has been notified.
* * * UPDATE FROM MARTIN RAJKOWSKI TO PETE SNYDER AT 1656 ON 9/25/10 * * *
All equipment noted as out of service above has been returned to service as of 1541 CDT on 9/25/10.
Notified R3DO (Skokowski).