Event Notification Report for November 11, 2013
U.S. Nuclear Regulatory Commission
Operations Center
EVENT REPORTS FOR
11/10/2013 - 11/11/2013
EVENT NUMBERS
49527
49527
Power Reactor
Event Number: 49527
Facility: OCONEE
Region: 2 State: SC
Unit: [1] [] []
RX Type: [1] B&W-L-LP,[2] B&W-L-LP,[3] B&W-L-LP
NRC Notified By: COREY A. GRAY
HQ OPS Officer: STEVE SANDIN
Region: 2 State: SC
Unit: [1] [] []
RX Type: [1] B&W-L-LP,[2] B&W-L-LP,[3] B&W-L-LP
NRC Notified By: COREY A. GRAY
HQ OPS Officer: STEVE SANDIN
Notification Date: 11/11/2013
Notification Time: 08:48 [ET]
Event Date: 11/11/2013
Event Time: 05:20 [EST]
Last Update Date: 11/11/2013
Notification Time: 08:48 [ET]
Event Date: 11/11/2013
Event Time: 05:20 [EST]
Last Update Date: 11/11/2013
Emergency Class: NON EMERGENCY
10 CFR Section:
50.72(b)(2)(i) - PLANT S/D REQD BY TS 50.72(b)(3)(ii)(A) - DEGRADED CONDITION
10 CFR Section:
50.72(b)(2)(i) - PLANT S/D REQD BY TS 50.72(b)(3)(ii)(A) - DEGRADED CONDITION
Person (Organization):
ALAN BLAMEY (R2DO)
DAVID SKEEN (NRR)
SCOTT MORRIS (IRD)
ALAN BLAMEY (R2DO)
DAVID SKEEN (NRR)
SCOTT MORRIS (IRD)
| Unit | SCRAM Code | RX Crit | Initial PWR | Initial RX Mode | Current PWR | Current RX Mode |
|---|---|---|---|---|---|---|
| 1 | N | Y | 20 | Power Operation | 13 | Power Operation |
UNIT 1 COMMENCED A TECHNICAL SPECIFICATION REQUIRED SHUTDOWN DUE TO RCS LEAKAGE
"Oconee Nuclear Station identified a small Reactor Coolant System (RCS) pressure boundary leak on ONS [Oconee Nuclear Station] Unit 1 and initiated a Unit 1 shutdown at 0520 hours [EST] on November 11, 2013 in accordance with procedures and Technical Specifications. Visual inspection confirmed the leak is located on the 1B2 loop High Pressure Injection Line. ONS Unit 1 was operating at full power when the leak was identified and a down power to 20% was commenced at 2141 hours [EST] on November 10, 2013 in order to characterize the leak and leak location. The measured RCS leak rate was 0.13 gpm [gallons per minute] at the time of commencing the down power.
"This issue is reportable per 10 CFR 50.72(b)(2)(i) and 10 CFR 50.72(b)(3)(ii)(A).
"The NRC Resident Inspector has been notified. This event poses no threat to the public or station employees."
Unit 1 entered TS 3.4.13 Condition B at 0520 EST on 11/11/13. This TS requires Unit 1 be in Mode 3 Hot Standby within 12 hours and Mode 5 Cold Shutdown within 36 hours. The generator is currently offline and the licensee anticipates entering Mode 3 at 1000 EST. Unit 1 entered their Abnormal Operating procedures for leak determination at 0442 EST on 11/09/13.
"Oconee Nuclear Station identified a small Reactor Coolant System (RCS) pressure boundary leak on ONS [Oconee Nuclear Station] Unit 1 and initiated a Unit 1 shutdown at 0520 hours [EST] on November 11, 2013 in accordance with procedures and Technical Specifications. Visual inspection confirmed the leak is located on the 1B2 loop High Pressure Injection Line. ONS Unit 1 was operating at full power when the leak was identified and a down power to 20% was commenced at 2141 hours [EST] on November 10, 2013 in order to characterize the leak and leak location. The measured RCS leak rate was 0.13 gpm [gallons per minute] at the time of commencing the down power.
"This issue is reportable per 10 CFR 50.72(b)(2)(i) and 10 CFR 50.72(b)(3)(ii)(A).
"The NRC Resident Inspector has been notified. This event poses no threat to the public or station employees."
Unit 1 entered TS 3.4.13 Condition B at 0520 EST on 11/11/13. This TS requires Unit 1 be in Mode 3 Hot Standby within 12 hours and Mode 5 Cold Shutdown within 36 hours. The generator is currently offline and the licensee anticipates entering Mode 3 at 1000 EST. Unit 1 entered their Abnormal Operating procedures for leak determination at 0442 EST on 11/09/13.