Event Notification Report for May 26, 2002
U.S. Nuclear Regulatory Commission
Operations Center
EVENT REPORTS FOR
05/25/2002 - 05/26/2002
EVENT NUMBERS
38946
!!!!! THIS EVENT HAS BEEN RETRACTED !!!!!
!!!!! THIS EVENT HAS BEEN RETRACTED !!!!!
Power Reactor
Event Number: 38946
Facility: CATAWBA
Region: 2 State: SC
Unit: [1] [] []
RX Type: [1] W-4-LP,[2] W-4-LP
NRC Notified By: BRADLEY
HQ OPS Officer: CHAUNCEY GOULD
Region: 2 State: SC
Unit: [1] [] []
RX Type: [1] W-4-LP,[2] W-4-LP
NRC Notified By: BRADLEY
HQ OPS Officer: CHAUNCEY GOULD
Notification Date: 05/26/2002
Notification Time: 15:24 [ET]
Event Date: 05/26/2002
Event Time: 08:35 [EDT]
Last Update Date: 06/17/2002
Notification Time: 15:24 [ET]
Event Date: 05/26/2002
Event Time: 08:35 [EDT]
Last Update Date: 06/17/2002
Emergency Class: NON EMERGENCY
10 CFR Section:
50.72(b)(3)(v)(D) - ACCIDENT MITIGATION
10 CFR Section:
50.72(b)(3)(v)(D) - ACCIDENT MITIGATION
Person (Organization):
THOMAS DECKER (R2)
THOMAS DECKER (R2)
| Unit | SCRAM Code | RX Crit | Initial PWR | Initial RX Mode | Current PWR | Current RX Mode |
|---|---|---|---|---|---|---|
| 1 | N | Y | 100 | Power Operation | 100 | Power Operation |
PERSONNEL ACCESS DOOR BETWEEN UPPER AND LOWER CONTAINMENT COMPARTMENTS FOUND OPEN
Maintenance technicians discovered a personnel access door (submarine hatch) open between the upper and lower containment compartments. The seals and sealing surfaces were inspected and the door was closed immediately in compliance with LCO 3.6.14. While the door was open, containment divider integrity was not intact per LCO 3.6.14. This LCO establishes the minimum equipment requirements to ensure that the divider barrier performs its safety function of ensuring that bypass leakage, in the event of a DBA, does not exceed the bypass leakage assumed in the accident analysis. The divider barrier functions with the ice condenser to limit the pressure and temperature that could be expected following a DBA.
An analysis performed to support a 6 hour completion time in LCO 3.6.14 condition B indicates that an open hatch(7.5 sq. ft bypass area) during a DBA does not impact the design pressure or temperature of the containment. The submarine hatch is 2 ft in diameter(3.19 sq. ft), thus the safety significance is considered minimal at this time.
The NRC Resident Inspector will be notified along with the states of N Carolina and S Carolina.
Also the nearby counties were notified.
* * * RETRACTED ON 6/17/02 AT 1648 EDT BY JIMMY BURGESS TO FANGIE JONES * * *
The licensee is retracting this event notification as further analysis has shown that the divider barrier seal would have been able to perform its safety function. The expected post-accident pressure increase resulting from the increased bypass leakage through the hatch opening would be within the containment pressure accident analysis limits.
The licensee will send a License Event Report to the NRC within 60 days of the event.
The licensee notified the NRC Resident Inspector. The R2DO (Kerry Landis) has been notified.
Maintenance technicians discovered a personnel access door (submarine hatch) open between the upper and lower containment compartments. The seals and sealing surfaces were inspected and the door was closed immediately in compliance with LCO 3.6.14. While the door was open, containment divider integrity was not intact per LCO 3.6.14. This LCO establishes the minimum equipment requirements to ensure that the divider barrier performs its safety function of ensuring that bypass leakage, in the event of a DBA, does not exceed the bypass leakage assumed in the accident analysis. The divider barrier functions with the ice condenser to limit the pressure and temperature that could be expected following a DBA.
An analysis performed to support a 6 hour completion time in LCO 3.6.14 condition B indicates that an open hatch(7.5 sq. ft bypass area) during a DBA does not impact the design pressure or temperature of the containment. The submarine hatch is 2 ft in diameter(3.19 sq. ft), thus the safety significance is considered minimal at this time.
The NRC Resident Inspector will be notified along with the states of N Carolina and S Carolina.
Also the nearby counties were notified.
* * * RETRACTED ON 6/17/02 AT 1648 EDT BY JIMMY BURGESS TO FANGIE JONES * * *
The licensee is retracting this event notification as further analysis has shown that the divider barrier seal would have been able to perform its safety function. The expected post-accident pressure increase resulting from the increased bypass leakage through the hatch opening would be within the containment pressure accident analysis limits.
The licensee will send a License Event Report to the NRC within 60 days of the event.
The licensee notified the NRC Resident Inspector. The R2DO (Kerry Landis) has been notified.