Event Notification Report for March 23, 2013
U.S. Nuclear Regulatory Commission
Operations Center
EVENT REPORTS FOR
03/22/2013 - 03/23/2013
EVENT NUMBERS
48847
Power Reactor
Event Number: 48847
Facility: VERMONT YANKEE
Region: 1 State: VT
Unit: [1] [] []
RX Type: [1] GE-4
NRC Notified By: ANDREW WISNIEWSKI
HQ OPS Officer: DONALD NORWOOD
Region: 1 State: VT
Unit: [1] [] []
RX Type: [1] GE-4
NRC Notified By: ANDREW WISNIEWSKI
HQ OPS Officer: DONALD NORWOOD
Notification Date: 03/24/2013
Notification Time: 13:16 [ET]
Event Date: 03/23/2013
Event Time: 23:18 [EDT]
Last Update Date: 03/28/2013
Notification Time: 13:16 [ET]
Event Date: 03/23/2013
Event Time: 23:18 [EDT]
Last Update Date: 03/28/2013
Emergency Class: NON EMERGENCY
10 CFR Section:
50.72(b)(3)(v)(A) - POT UNABLE TO SAFE SD 50.72(b)(3)(v)(B) - POT RHR INOP 50.72(b)(3)(v)(C) - POT UNCNTRL RAD REL 50.72(b)(3)(v)(D) - ACCIDENT MITIGATION
10 CFR Section:
50.72(b)(3)(v)(A) - POT UNABLE TO SAFE SD 50.72(b)(3)(v)(B) - POT RHR INOP 50.72(b)(3)(v)(C) - POT UNCNTRL RAD REL 50.72(b)(3)(v)(D) - ACCIDENT MITIGATION
Person (Organization):
JAMES TRAPP (R1DO)
JAMES TRAPP (R1DO)
| Unit | SCRAM Code | RX Crit | Initial PWR | Initial RX Mode | Current PWR | Current RX Mode |
|---|---|---|---|---|---|---|
| 1 | N | N | 0 | Refueling | 0 | Refueling |
SWITCHGEAR ROOM DEGRADED FLOOD SEALS
"On 3/23/13 it was identified that a conduit flood seal between an outside manhole and the switchgear rooms is displaced. This degraded flood seal compromises the flooding design of both the East and West Switchgear Rooms.
"Compensatory measures were implemented for the flood seal in accordance with the plants barrier control process. Repairs of the seal are in progress."
Per the licensee these switchgear rooms contain both normal and safety related 4kV and 480 V electrical boards. Compensatory measures implemented include: Plant Maintenance personnel will take actions to seal any leak within 24 hours of a flooding event and also provide sump pumps to remove any water that has leaked in.
The licensee notified the NRC Resident Inspector and the Vermont State Liaison.
* * * UPDATE AT 2000 EDT ON 03/28/13 FROM BOB VITA TO S. SANDIN * * *
"This is an update to NRC Event No. 48847 reported on 3/24/13 at 1316 [EDT].
"On 3/27/2013 the extent of condition review identified two additional possible water intrusion paths from the outside to the switchgear rooms.
"Compensatory measures were implemented for these paths in accordance with plant procedures. Efforts to seal these paths are in progress."
This is an on-going extent of condition assessment.
The licensee will inform the NRC Resident Inspector and the Vermont State Liaison. Notified R1DO (Krohn).
"On 3/23/13 it was identified that a conduit flood seal between an outside manhole and the switchgear rooms is displaced. This degraded flood seal compromises the flooding design of both the East and West Switchgear Rooms.
"Compensatory measures were implemented for the flood seal in accordance with the plants barrier control process. Repairs of the seal are in progress."
Per the licensee these switchgear rooms contain both normal and safety related 4kV and 480 V electrical boards. Compensatory measures implemented include: Plant Maintenance personnel will take actions to seal any leak within 24 hours of a flooding event and also provide sump pumps to remove any water that has leaked in.
The licensee notified the NRC Resident Inspector and the Vermont State Liaison.
* * * UPDATE AT 2000 EDT ON 03/28/13 FROM BOB VITA TO S. SANDIN * * *
"This is an update to NRC Event No. 48847 reported on 3/24/13 at 1316 [EDT].
"On 3/27/2013 the extent of condition review identified two additional possible water intrusion paths from the outside to the switchgear rooms.
"Compensatory measures were implemented for these paths in accordance with plant procedures. Efforts to seal these paths are in progress."
This is an on-going extent of condition assessment.
The licensee will inform the NRC Resident Inspector and the Vermont State Liaison. Notified R1DO (Krohn).