Event Notification Report for February 18, 2011
U.S. Nuclear Regulatory Commission
Operations Center
EVENT REPORTS FOR
02/17/2011 - 02/18/2011
Power Reactor
Event Number: 46623
Facility: CALVERT CLIFFS
Region: 1 State: MD
Unit: [] [2] []
RX Type: [1] CE,[2] CE
NRC Notified By: CHARLES MORGAN
HQ OPS Officer: PETE SNYDER
Region: 1 State: MD
Unit: [] [2] []
RX Type: [1] CE,[2] CE
NRC Notified By: CHARLES MORGAN
HQ OPS Officer: PETE SNYDER
Notification Date: 02/18/2011
Notification Time: 02:31 [ET]
Event Date: 02/18/2011
Event Time: 00:51 [EST]
Last Update Date: 02/18/2011
Notification Time: 02:31 [ET]
Event Date: 02/18/2011
Event Time: 00:51 [EST]
Last Update Date: 02/18/2011
Emergency Class: NON EMERGENCY
10 CFR Section:
50.72(b)(3)(ii)(A) - DEGRADED CONDITION
10 CFR Section:
50.72(b)(3)(ii)(A) - DEGRADED CONDITION
Person (Organization):
MARC FERDAS (R1DO)
MARC FERDAS (R1DO)
| Unit | SCRAM Code | RX Crit | Initial PWR | Initial RX Mode | Current PWR | Current RX Mode |
|---|---|---|---|---|---|---|
| 2 | N | N | 0 | Refueling | 0 | Refueling |
INACTIVE LEAK IDENTIFIED ON PRESURIZER HEATER WELL
"During a scheduled VT-2 boric acid examination on the Unit 2 Pressurizer lower level heater penetrations a boric acid leak was identified on heater penetration N-3."
The licensee characterized the leak as inactive. The approximate sizes of the round boric acid deposits are 1/32 inch and 1/64 inch. The licensee continues to investigate and plan recovery actions.
The licensee notified the NRC Resident Inspector.
"During a scheduled VT-2 boric acid examination on the Unit 2 Pressurizer lower level heater penetrations a boric acid leak was identified on heater penetration N-3."
The licensee characterized the leak as inactive. The approximate sizes of the round boric acid deposits are 1/32 inch and 1/64 inch. The licensee continues to investigate and plan recovery actions.
The licensee notified the NRC Resident Inspector.
!!!!! THIS EVENT HAS BEEN RETRACTED !!!!!
!!!!! THIS EVENT HAS BEEN RETRACTED !!!!!
Power Reactor
Event Number: 46625
Facility: COMANCHE PEAK
Region: 4 State: TX
Unit: [1] [] []
RX Type: [1] W-4-LP,[2] W-4-LP
NRC Notified By: ALEX IBARRA
HQ OPS Officer: VINCE KLCO
Region: 4 State: TX
Unit: [1] [] []
RX Type: [1] W-4-LP,[2] W-4-LP
NRC Notified By: ALEX IBARRA
HQ OPS Officer: VINCE KLCO
Notification Date: 02/18/2011
Notification Time: 12:16 [ET]
Event Date: 02/18/2011
Event Time: 10:45 [CST]
Last Update Date: 02/24/2011
Notification Time: 12:16 [ET]
Event Date: 02/18/2011
Event Time: 10:45 [CST]
Last Update Date: 02/24/2011
Emergency Class: UNUSUAL EVENT
10 CFR Section:
50.72(a) (1) (i) - EMERGENCY DECLARED
10 CFR Section:
50.72(a) (1) (i) - EMERGENCY DECLARED
Person (Organization):
VINCENT GADDY (R4DO)
ERIC LEEDS (NRR)
ELMO COLLINS (R4)
WILLIAM GOTT (IRD)
KNOX (DHS)
VINCENT GADDY (R4DO)
ERIC LEEDS (NRR)
ELMO COLLINS (R4)
WILLIAM GOTT (IRD)
KNOX (DHS)
| Unit | SCRAM Code | RX Crit | Initial PWR | Initial RX Mode | Current PWR | Current RX Mode |
|---|---|---|---|---|---|---|
| 1 | N | Y | 100 | Power Operation | 100 | Power Operation |
UNUSUAL EVENT- EXCESSIVE LEAKAGE FROM A CHARGING SYSTEM
At 1045 CST, on 2/18/11, Comanche Peak Unit 1 declared an Unusual Event related to excessive leakage from the charging system. The 40 GPM leakage was in excess of the specified limit of 25 GPM. At 1121 CST, the charging system leakage was verified isolated. Unit 1 is in stable condition and remains at 100% power. No offsite assistance is required at this time.
* * * UPDATE FROM TERRY MARSH TO DONG PARK AT 1438 EST ON 2/18/11 * * *
"At 1311 EST, Comanche Peak Nuclear Power Plant has terminated the Unusual Event. The leaking valve in the charging system has been isolated reducing the leakage to zero. Repairs to the valve are in planning."
The licensee notified the NRC Resident Inspector. The licensee notified the Texas Department of Public Safety and will be making a press release to the local press.
Notified R4DO (Gaddy), IRD (Gott), NRR EO (Thorp), DHS (McDonald) and FEMA (Via).
* * * RETRACTION FROM RAY FISHENCORD TO JOHN SHOEMAKER AT 0810 EST ON 2/24/11 * * *
"This is a follow-up notification to inform the NRC that Comanche Peak Nuclear Power Plant is retracting Event Number 46625, the Unusual Event declaration reported on February 18, 2011 at 10:45 Central Standard Time.
"The declaration was made based on EAL SU8.1, [Reactor Coolant System] RCS Leakage, and was terminated on February 18, 2011 at 13:11 Central Standard Time. The declaration is retracted because the source of the leakage was from the Chemical and Volume Control System (CVCS) and not from the Reactor Coolant System."
The licensee has notified the NRC Resident Inspector.
Notified R4DO (Campbell)
At 1045 CST, on 2/18/11, Comanche Peak Unit 1 declared an Unusual Event related to excessive leakage from the charging system. The 40 GPM leakage was in excess of the specified limit of 25 GPM. At 1121 CST, the charging system leakage was verified isolated. Unit 1 is in stable condition and remains at 100% power. No offsite assistance is required at this time.
* * * UPDATE FROM TERRY MARSH TO DONG PARK AT 1438 EST ON 2/18/11 * * *
"At 1311 EST, Comanche Peak Nuclear Power Plant has terminated the Unusual Event. The leaking valve in the charging system has been isolated reducing the leakage to zero. Repairs to the valve are in planning."
The licensee notified the NRC Resident Inspector. The licensee notified the Texas Department of Public Safety and will be making a press release to the local press.
Notified R4DO (Gaddy), IRD (Gott), NRR EO (Thorp), DHS (McDonald) and FEMA (Via).
* * * RETRACTION FROM RAY FISHENCORD TO JOHN SHOEMAKER AT 0810 EST ON 2/24/11 * * *
"This is a follow-up notification to inform the NRC that Comanche Peak Nuclear Power Plant is retracting Event Number 46625, the Unusual Event declaration reported on February 18, 2011 at 10:45 Central Standard Time.
"The declaration was made based on EAL SU8.1, [Reactor Coolant System] RCS Leakage, and was terminated on February 18, 2011 at 13:11 Central Standard Time. The declaration is retracted because the source of the leakage was from the Chemical and Volume Control System (CVCS) and not from the Reactor Coolant System."
The licensee has notified the NRC Resident Inspector.
Notified R4DO (Campbell)