| U.S. Nuclear Regulatory Commission
Operations Center Event Reports For
09/05/2007 - 09/06/2007 ** EVENT NUMBERS ** |
 | Power Reactor | Event Number: 43613 | Facility: BROWNS FERRY
Region: 2 State: AL
Unit: [1] [ ] [ ]
RX Type: [1] GE-4,[2] GE-4,[3] GE-4
NRC Notified By: MATTHEW RASMUSSEN
HQ OPS Officer: JASON KOZAL | Notification Date: 09/03/2007
Notification Time: 05:05 [ET]
Event Date: 09/03/2007
Event Time: 02:14 [CDT]
Last Update Date: 09/05/2007 | 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):
SCOTT SHAEFFER (R2)
|
| Unit | SCRAM Code | RX CRIT | Initial PWR | Initial RX Mode | Current PWR | Current RX Mode | | 1 | M/R | Y | 100 | Power Operation | 0 | Hot Shutdown | Event Text MANUAL REACTOR SCRAM DUE TO ELECTRO-HYDRAULIC CONTROL (EHC) SYSTEM LEAK
"At 0214 [CDT] on 09/03/2007 with Unit 1 at 100% power a core flow runback and manual reactor scram were initiated due to a Electro-Hydraulic Control (EHC) System leak. Units 2 and 3 were also at 100% power and were unaffected by the event. As expected reactor water level momentarily lowered below +2 inches (Reactor Low Water Level) and all appropriate PCIS [Primary Containment Isolation System] isolations, Group 2 (RHR Shutdown Cooling). Group 3 (RWCU), Group 6 (Ventilation), and Group 8 (TIP) were received along with the auto start of CREVs [Control Room Emergency Ventilation] and 3 SBGT trains.
"This event is reportable as a 4-hour and 8-hour non-emergency notification along with a 60-day written report in accordance with 10 CFR 50.72(b)(2)(iv)(B), 10 CFR 50 72(b)(3)(iv)(A) and 10 CFR 50.73(a)(2)(iv)(A) as 'any event or condition that results in valid actuation of RPS or PCIS.'
"All control rods fully inserted, the electrical grid is stable, the EDGs and ESF systems remain available, and decay heat is being removed via the Turbine Bypass Valves and reactor water level is being controlled by the Reactor Feedwater System. The licensee notified the NRC Resident Inspector.
"Investigation into the cause of the leak is ongoing."
* * * UPDATE FROM DON SMITH TO HUFFMAN AT 1357 EDT ON 9/05/07 * * *
"The Unit 2 Refuel Zone Inboard Exhaust Damper, 2-FCO-64-10, failed to indicate closed in the Control Room at Panel 2-9-25 in response to the Group 6 isolation signal received during the Unit 1 Reactor SCRAM on 09/03/2007 at 0214 CDT as required by the plant design. The damper was physically verified to be open. The Unit 2 Refuel Zone Outboard Exhaust Damper, 2-FCO-64-09 automatically isolated as designed in response to the Group 6 isolation signal fulfilling its Safety Function, was verified closed and was later tagged closed as required by Technical Specifications. Investigation into the cause of the failure of the 2-FCO-64-10 is ongoing."
The licensee notified the NRC Resident Inspector. R2DO ( Ernstes) notified. |
| Power Reactor | Event Number: 43614 | Facility: TURKEY POINT
Region: 2 State: FL
Unit: [3] [4] [ ]
RX Type: [3] W-3-LP,[4] W-3-LP
NRC Notified By: EDWARD NIELSEN
HQ OPS Officer: BILL HUFFMAN | Notification Date: 09/05/2007
Notification Time: 12:46 [ET]
Event Date: 09/05/2007
Event Time: 11:17 [EDT]
Last Update Date: 09/05/2007 | Emergency Class: NON EMERGENCY
10 CFR Section:
50.72(b)(3)(xiii) - LOSS COMM/ASMT/RESPONSE
| Person (Organization):
MIKE ERNSTES (R2)
|
| Unit | SCRAM Code | RX CRIT | Initial PWR | Initial RX Mode | Current PWR | Current RX Mode | | 3 | N | N | 0 | Cold Shutdown | 0 | Cold Shutdown | | 4 | N | Y | 100 | Power Operation | 100 | Power Operation | Event Text MODIFICATION TO PROCESS COMPUTER THAT IMPACT ERDS AND SPDS
"The Plant Process Computer System (Emergency Response and Data Acquisition System, 'ERDADS') will be taken out of service for an approximate 4 week period (on Unit 3) to implement a planned modification. The current ERDADS is being replaced on Unit 3 and a computer outage is required for the installation of the new ERDADS. During this time period ERDS and SPDS functions will not be available for Unit 3. Unit 4 will function normally after a modification (expected duration 6 hours) to the existing computer operating system software is implemented . Also, Unit 3 Regulatory Guide 1.97 category 2D containment temperature and power system indicators for motor control centers, batteries, and inverters will not be available in the Control Room, although other instrumentation is available to monitor these parameters.
"This is an 8-hour reportable event per 10 CFR 50.72(b)(3)(xiii) Major Loss of Assessment Capability. The operation of plant systems will not be affected due to this planned action. ERDS and SPDS parameters will be monitored by control board indications. Compensatory actions have been developed.
"Follow up notification to NRC will be given once Unit 4 ERDS and SPDS are returned to service."
The licensee notified the NRC Resident Inspector. |
| Power Reactor | Event Number: 43615 | Facility: OCONEE
Region: 2 State: SC
Unit: [1] [2] [3]
RX Type: [1] B&W-L-LP,[2] B&W-L-LP,[3] B&W-L-LP
NRC Notified By: KIETH GREWE
HQ OPS Officer: MARK ABRAMOVITZ | Notification Date: 09/06/2007
Notification Time: 02:00 [ET]
Event Date: 09/06/2007
Event Time: 00:30 [EDT]
Last Update Date: 09/06/2007 | Emergency Class: NON EMERGENCY
10 CFR Section:
50.72(b)(2)(xi) - OFFSITE NOTIFICATION
| Person (Organization):
MIKE ERNSTES (R2)
|
| Unit | SCRAM Code | RX CRIT | Initial PWR | Initial RX Mode | Current PWR | Current RX Mode | | 1 | N | Y | 100 | Power Operation | 100 | Power Operation | | 2 | N | Y | 100 | Power Operation | 100 | Power Operation | | 3 | N | Y | 100 | Power Operation | 100 | Power Operation | Event Text OIL SPILL AT KEOWEE HYDRO STATION
"Reportable oil spill (Teresstic 68, approximately 1 gallon) into the discharge of Keowee Hydro Station tailrace (Keowee River). Source of the release was the Keowee Hydro Station sump. The release is NOT continuing. Operation of units 1, 2, and 3 are unaffected.
"At request of HAZMAT teams for safety during investigation and recovery of oil, commercial operation of Keowee Hydro units is restricted. Emergency operation of Keowee Hydro Units is unaffected.
"HAZMAT teams have placed oil absorbent boom across Keowee Hydro tailrace (Keowee River) to contain/collect oil."
The licensee contacted the Coast Guard via the National Response Center (event #847958), the State Emergency Response Committee, Oconee County Center, and Pickens County Center.
The licensee notified the NRC Resident Inspector. | |