Event Notification Report for August 10, 2012
U.S. Nuclear Regulatory Commission
Operations Center
EVENT REPORTS FOR
08/09/2012 - 08/10/2012
Power Reactor
Event Number: 48179
Facility: THREE MILE ISLAND
Region: 1 State: PA
Unit: [1] [] []
RX Type: [1] B&W-L-LP,[2] B&W-L-LP
NRC Notified By: JASON HARNER
HQ OPS Officer: JOHN KNOKE
Region: 1 State: PA
Unit: [1] [] []
RX Type: [1] B&W-L-LP,[2] B&W-L-LP
NRC Notified By: JASON HARNER
HQ OPS Officer: JOHN KNOKE
Notification Date: 08/10/2012
Notification Time: 19:44 [ET]
Event Date: 08/10/2012
Event Time: 12:30 [EDT]
Last Update Date: 08/10/2012
Notification Time: 19:44 [ET]
Event Date: 08/10/2012
Event Time: 12:30 [EDT]
Last Update Date: 08/10/2012
Emergency Class: NON EMERGENCY
10 CFR Section:
50.72(b)(3)(v)(B) - POT RHR INOP
10 CFR Section:
50.72(b)(3)(v)(B) - POT RHR INOP
Person (Organization):
ART BURRITT (R1DO)
ART BURRITT (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 |
FLOOD BARRIER SEALS COULD NOT BE VERIFIED INSTALLED
"On August 10, 2012 during an inspection in the Air Intake Tunnel, six 4-inch conduits that carry cabling from yard vaults through the Air Intake Tunnel (AIT) to the Auxiliary Building (AB) were inspected for flood seals. This was done by opening the conduit seals bottom drain openings to inspect the condition by boroscope. These seal components are just inside the AIT from the electrical vaults. During the inspections no sealant could be readily identified. Each conduit from the yard vaults that is not sealed could potentially provide a leak path during flood conditions from the yard vaults to the Auxiliary Building via the electrical conduit. Flood water entering the Auxiliary Building could impact the decay heat removal function.
"This is reportable as an 8 hour ENS notification under 10CFR50.72(b)(3)(v)(B) and 10CFR50.72(a)(1)(ii) as a condition that at the time of discovery could have prevented the fulfillment of the safety function of structures or systems that are needed to remove residual heat.
"The licensee notified the NRC Resident Inspector."
"On August 10, 2012 during an inspection in the Air Intake Tunnel, six 4-inch conduits that carry cabling from yard vaults through the Air Intake Tunnel (AIT) to the Auxiliary Building (AB) were inspected for flood seals. This was done by opening the conduit seals bottom drain openings to inspect the condition by boroscope. These seal components are just inside the AIT from the electrical vaults. During the inspections no sealant could be readily identified. Each conduit from the yard vaults that is not sealed could potentially provide a leak path during flood conditions from the yard vaults to the Auxiliary Building via the electrical conduit. Flood water entering the Auxiliary Building could impact the decay heat removal function.
"This is reportable as an 8 hour ENS notification under 10CFR50.72(b)(3)(v)(B) and 10CFR50.72(a)(1)(ii) as a condition that at the time of discovery could have prevented the fulfillment of the safety function of structures or systems that are needed to remove residual heat.
"The licensee notified the NRC Resident Inspector."
Power Reactor
Event Number: 48175
Facility: WATTS BAR
Region: 2 State: TN
Unit: [1] [] []
RX Type: [1] W-4-LP,[2] W-4-LP
NRC Notified By: MATTHEW MILLER
HQ OPS Officer: JOHN SHOEMAKER
Region: 2 State: TN
Unit: [1] [] []
RX Type: [1] W-4-LP,[2] W-4-LP
NRC Notified By: MATTHEW MILLER
HQ OPS Officer: JOHN SHOEMAKER
Notification Date: 08/10/2012
Notification Time: 08:57 [ET]
Event Date: 08/10/2012
Event Time: 08:48 [EDT]
Last Update Date: 08/10/2012
Notification Time: 08:57 [ET]
Event Date: 08/10/2012
Event Time: 08:48 [EDT]
Last Update Date: 08/10/2012
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):
DANIEL RICH (R2DO)
VICTOR MCCREE (RA)
BRUCE BOGER (RX)
JANE MARSHALL (IRD)
ERIC THOMAS (NRR)
DANIEL RICH (R2DO)
VICTOR MCCREE (RA)
BRUCE BOGER (RX)
JANE MARSHALL (IRD)
ERIC THOMAS (NRR)
| 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 DECLARED DUE TO TOXIC GAS RELEASE
At 0848 EDT, on 8/10/12, Watts Bar declared an Notification of Unusual Event (NOUE), EAL Tab 4.4, based on access restrictions to the turbine building due to a toxic gas release (Ammonia). The leak has been secured. Operators are currently in protective gear in the turbine building in an effort to ventilate the residual gas from all affected areas and re-establish normal access. The gas release has caused no personnel injuries or equipment damage. The licensee continues to operation at 100% power.
Watts Bar will remain in an NOUE until the area can be ventilated and normal access is reestablished.
The NRC Resident Inspector will be notified. The licensee has notified state and local government. Notified DHS SWO, FEMA OPS, DHS NICC, and NUCLEARSSA via email.
* * * UPDATE FROM NEWTON LACY TO JOHN KNOKE AT 1331 EDT ON 08/10/12 * * *
At 1325 EDT Watts Bar terminated the Notification of Unusual Event (NOUE). The Ammonia leak was due to a valve in the fill line to the Ammonia Mixing Tank not being fully closed, thereby causing the tank to overflow.
The NRC Resident Inspector has been notified. Notified R2DO (Rich), NRREO (Evans), IRD MOC (Marshall). Notified DHS SWO, FEMA OPS, DHS NICC, and NUCLEARSSA via email.
At 0848 EDT, on 8/10/12, Watts Bar declared an Notification of Unusual Event (NOUE), EAL Tab 4.4, based on access restrictions to the turbine building due to a toxic gas release (Ammonia). The leak has been secured. Operators are currently in protective gear in the turbine building in an effort to ventilate the residual gas from all affected areas and re-establish normal access. The gas release has caused no personnel injuries or equipment damage. The licensee continues to operation at 100% power.
Watts Bar will remain in an NOUE until the area can be ventilated and normal access is reestablished.
The NRC Resident Inspector will be notified. The licensee has notified state and local government. Notified DHS SWO, FEMA OPS, DHS NICC, and NUCLEARSSA via email.
* * * UPDATE FROM NEWTON LACY TO JOHN KNOKE AT 1331 EDT ON 08/10/12 * * *
At 1325 EDT Watts Bar terminated the Notification of Unusual Event (NOUE). The Ammonia leak was due to a valve in the fill line to the Ammonia Mixing Tank not being fully closed, thereby causing the tank to overflow.
The NRC Resident Inspector has been notified. Notified R2DO (Rich), NRREO (Evans), IRD MOC (Marshall). Notified DHS SWO, FEMA OPS, DHS NICC, and NUCLEARSSA via email.