Event Notification Report for January 03, 2014
U.S. Nuclear Regulatory Commission
Operations Center
EVENT REPORTS FOR
01/02/2014 - 01/03/2014
!!!!! THIS EVENT HAS BEEN RETRACTED !!!!!
!!!!! THIS EVENT HAS BEEN RETRACTED !!!!!
Power Reactor
Event Number: 49690
Facility: SEQUOYAH
Region: 2 State: TN
Unit: [1] [2] []
RX Type: [1] W-4-LP,[2] W-4-LP
NRC Notified By: ROBERT CAMENISCH
HQ OPS Officer: MARK ABRAMOVITZ
Region: 2 State: TN
Unit: [1] [2] []
RX Type: [1] W-4-LP,[2] W-4-LP
NRC Notified By: ROBERT CAMENISCH
HQ OPS Officer: MARK ABRAMOVITZ
Notification Date: 01/03/2014
Notification Time: 22:07 [ET]
Event Date: 01/03/2014
Event Time: 15:00 [EST]
Last Update Date: 01/30/2014
Notification Time: 22:07 [ET]
Event Date: 01/03/2014
Event Time: 15:00 [EST]
Last Update Date: 01/30/2014
Emergency Class: NON EMERGENCY
10 CFR Section:
50.72(b)(3)(ii)(B) - UNANALYZED CONDITION
10 CFR Section:
50.72(b)(3)(ii)(B) - UNANALYZED CONDITION
Person (Organization):
ROBERT HAAG (R2DO)
ROBERT HAAG (R2DO)
| 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 |
ABGTS POTENTIALLY INOPERABLE FOR BOTH UNITS UNDER WORST-CASE CONDITIONS
"At 1500 EST on 01/03/2014, TVA determined that during certain conditions, Service Air usage (air used for non-safety related tools/equipment) could result in introducing air into the Auxiliary Building Secondary Containment Enclosure that could, in worst-case conditions, exceed the margin required to maintain the Auxiliary Building Gas Treatment System (ABGTS) operable for Sequoyah Units 1 and 2. ABGTS is required to be operable for both units by Technical Specifications. This is an unanalyzed condition that could prevent both trains of ABGTS from performing [their] safety function[s]. Service air has been isolated to the Auxiliary Building and is under administrative controls until further analysis [is] complete. This is additional information discovered during follow-up evaluation regarding the issue identified in LER 50-327/2013-004. Further analysis will be performed to determine safety significance."
There is 1600 scfm margin in the ABSGTS. The Service Air compressors have an 1850 scfm capacity.
The licensee informed the NRC Resident Inspector.
* * * RETRACTION FROM BRUCE BUCH TO DANIEL MILLS AT 1428 EST ON 1/30/2014 * * *
"Sequoyah Nuclear Plant, Units 1 and 2, are retracting the 8 hour non-emergency notification January 3, 2014 at 2207 EST (EN# 49690).
"The notification on January 3, 2014, reported under certain conditions, service air usage could result in the Auxiliary Building Secondary Containment Enclosure (ABSCE), in worst case conditions, exceeding the margin required to maintain the Auxiliary Building Gas Treatment System (ABGTS) operable and prevent both trains of ABGTS from performing its safety function(s).
"Subsequent engineering analysis concluded acceptable margin was available. Both trains of ABGTS would have remained operable and capable of performing its design function(s) at all times. The engineering analysis results are captured in the licensee's corrective action program. Based on the new analysis, the condition reported in EN #49690 did not result in an unanalyzed condition that significantly degraded plant safety. This event report is being retracted.
"The NRC Resident Inspector has been briefed on the analysis results and informed of this retraction."
Notified R2DO (McCoy).
"At 1500 EST on 01/03/2014, TVA determined that during certain conditions, Service Air usage (air used for non-safety related tools/equipment) could result in introducing air into the Auxiliary Building Secondary Containment Enclosure that could, in worst-case conditions, exceed the margin required to maintain the Auxiliary Building Gas Treatment System (ABGTS) operable for Sequoyah Units 1 and 2. ABGTS is required to be operable for both units by Technical Specifications. This is an unanalyzed condition that could prevent both trains of ABGTS from performing [their] safety function[s]. Service air has been isolated to the Auxiliary Building and is under administrative controls until further analysis [is] complete. This is additional information discovered during follow-up evaluation regarding the issue identified in LER 50-327/2013-004. Further analysis will be performed to determine safety significance."
There is 1600 scfm margin in the ABSGTS. The Service Air compressors have an 1850 scfm capacity.
The licensee informed the NRC Resident Inspector.
* * * RETRACTION FROM BRUCE BUCH TO DANIEL MILLS AT 1428 EST ON 1/30/2014 * * *
"Sequoyah Nuclear Plant, Units 1 and 2, are retracting the 8 hour non-emergency notification January 3, 2014 at 2207 EST (EN# 49690).
"The notification on January 3, 2014, reported under certain conditions, service air usage could result in the Auxiliary Building Secondary Containment Enclosure (ABSCE), in worst case conditions, exceeding the margin required to maintain the Auxiliary Building Gas Treatment System (ABGTS) operable and prevent both trains of ABGTS from performing its safety function(s).
"Subsequent engineering analysis concluded acceptable margin was available. Both trains of ABGTS would have remained operable and capable of performing its design function(s) at all times. The engineering analysis results are captured in the licensee's corrective action program. Based on the new analysis, the condition reported in EN #49690 did not result in an unanalyzed condition that significantly degraded plant safety. This event report is being retracted.
"The NRC Resident Inspector has been briefed on the analysis results and informed of this retraction."
Notified R2DO (McCoy).
Power Reactor
Event Number: 49691
Facility: LIMERICK
Region: 1 State: PA
Unit: [1] [2] []
RX Type: [1] GE-4,[2] GE-4
NRC Notified By: PAUL MARVEL
HQ OPS Officer: JOHN SHOEMAKER
Region: 1 State: PA
Unit: [1] [2] []
RX Type: [1] GE-4,[2] GE-4
NRC Notified By: PAUL MARVEL
HQ OPS Officer: JOHN SHOEMAKER
Notification Date: 01/04/2014
Notification Time: 01:22 [ET]
Event Date: 01/03/2014
Event Time: 23:00 [EST]
Last Update Date: 01/04/2014
Notification Time: 01:22 [ET]
Event Date: 01/03/2014
Event Time: 23:00 [EST]
Last Update Date: 01/04/2014
Emergency Class: NON EMERGENCY
10 CFR Section:
50.72(b)(2)(xi) - OFFSITE NOTIFICATION
10 CFR Section:
50.72(b)(2)(xi) - OFFSITE NOTIFICATION
Person (Organization):
RAY MCKINLEY (R1DO)
RAY MCKINLEY (R1DO)
| 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 |
SIREN ACTIVATION CAUSED BY EQUIPMENT MALFUNCTION
"Limerick Generating Station Main Control Room was informed that a Limerick Emergency Preparedness Zone (EPZ) Siren located in South Coventry, Chester County Pennsylvania area was sounding by an off-duty plant employee and confirmed by the Chester County 911 Dispatch Center. Notification occurred at 2300 hours on 1/13/14. This notification is being made in accordance with SAF 1.9 due to a spurious actuation of Limerick Emergency Preparedness Zone (EPZ) Siren.
"The siren maintenance contractor has been contacted to investigate and silence the sounding alarm.
"No actual Plant emergency exists. The siren activation was caused by equipment malfunction.
"[The] remaining 164 of 165 Limerick EPZ Sirens remain functional, no other reportability threshold(s) have been met or exceeded."
The licensee has notified the NRC Resident Inspector and state and local authorities.
"Limerick Generating Station Main Control Room was informed that a Limerick Emergency Preparedness Zone (EPZ) Siren located in South Coventry, Chester County Pennsylvania area was sounding by an off-duty plant employee and confirmed by the Chester County 911 Dispatch Center. Notification occurred at 2300 hours on 1/13/14. This notification is being made in accordance with SAF 1.9 due to a spurious actuation of Limerick Emergency Preparedness Zone (EPZ) Siren.
"The siren maintenance contractor has been contacted to investigate and silence the sounding alarm.
"No actual Plant emergency exists. The siren activation was caused by equipment malfunction.
"[The] remaining 164 of 165 Limerick EPZ Sirens remain functional, no other reportability threshold(s) have been met or exceeded."
The licensee has notified the NRC Resident Inspector and state and local authorities.