Event Notification Report for February 15, 2005
U.S. Nuclear Regulatory Commission
Operations Center
EVENT REPORTS FOR
02/14/2005 - 02/15/2005
EVENT NUMBERS
41444
!!!!! THIS EVENT HAS BEEN RETRACTED !!!!!
!!!!! THIS EVENT HAS BEEN RETRACTED !!!!!
Power Reactor
Event Number: 41444
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: RANDY CAMPBELL
HQ OPS Officer: CHAUNCEY GOULD
Region: 1 State: PA
Unit: [1] [] []
RX Type: [1] B&W-L-LP,[2] B&W-L-LP
NRC Notified By: RANDY CAMPBELL
HQ OPS Officer: CHAUNCEY GOULD
Notification Date: 02/26/2005
Notification Time: 00:59 [ET]
Event Date: 02/15/2005
Event Time: 20:55 [EST]
Last Update Date: 03/30/2005
Notification Time: 00:59 [ET]
Event Date: 02/15/2005
Event Time: 20:55 [EST]
Last Update Date: 03/30/2005
Emergency Class: NON EMERGENCY
10 CFR Section:
50.72(b)(3)(ii)(B) - UNANALYZED CONDITION 50.72(b)(3)(v)(D) - ACCIDENT MITIGATION
10 CFR Section:
50.72(b)(3)(ii)(B) - UNANALYZED CONDITION 50.72(b)(3)(v)(D) - ACCIDENT MITIGATION
Person (Organization):
PAMELA HENDERSON (R1)
JAMES TRAPP (R1)
PAMELA HENDERSON (R1)
JAMES TRAPP (R1)
| Unit | SCRAM Code | RX Crit | Initial PWR | Initial RX Mode | Current PWR | Current RX Mode |
|---|---|---|---|---|---|---|
| 1 | N | Y | 100 | Power Operation | 100 | Power Operation |
POSSIBLE FAILURE TO MEET DESIGN BASIS REQUIREMENTS OF POSITIVE PRESSURE IN THE CONTROL TOWER ENVELOPE FOLLOWING A DESIGN BASIS ACCIDENT.
The licensee provided the following information:
"During operator rounds it was discovered that a double door for the control tower habitability envelope was propped open [from painting earlier in the day]. This condition would have resulted in not meeting the design basis requirements of maintaining a positive pressure inside the control tower envelope following a design basis accident. The doors were immediately closed."
"An issue report was generated and a prompt investigation was commenced in accordance with station policies."
The NRC resident Inspector was notified.
*** RETRACTION FROM A. MILLER TO J. KNOKE AT 13:15 EST ON 03/30/05 ***
The licensee provided the following information:
"An ENS notification (EN# 41444) was made at approximately 00:59 on 2/20/2005 regarding a potentially unanalyzed condition associated with a double door for the Control Tower Habitability Envelope, which was propped open. It was initially thought that this condition could have resulted in not meeting the design basis requirements for the Control Tower Envelope. However, an analysis of an air flow measurement across the open door has shown that the unfiltered air in-leakage into the Control Tower Habitability Envelop would not exceed the value assumed in the design basis accident analysis for Control Room Habitability. Since this event did not result in an unanalyzed condition, this event is being retracted."
The licensee notified NRC Resident Inspector.
The licensee provided the following information:
"During operator rounds it was discovered that a double door for the control tower habitability envelope was propped open [from painting earlier in the day]. This condition would have resulted in not meeting the design basis requirements of maintaining a positive pressure inside the control tower envelope following a design basis accident. The doors were immediately closed."
"An issue report was generated and a prompt investigation was commenced in accordance with station policies."
The NRC resident Inspector was notified.
*** RETRACTION FROM A. MILLER TO J. KNOKE AT 13:15 EST ON 03/30/05 ***
The licensee provided the following information:
"An ENS notification (EN# 41444) was made at approximately 00:59 on 2/20/2005 regarding a potentially unanalyzed condition associated with a double door for the Control Tower Habitability Envelope, which was propped open. It was initially thought that this condition could have resulted in not meeting the design basis requirements for the Control Tower Envelope. However, an analysis of an air flow measurement across the open door has shown that the unfiltered air in-leakage into the Control Tower Habitability Envelop would not exceed the value assumed in the design basis accident analysis for Control Room Habitability. Since this event did not result in an unanalyzed condition, this event is being retracted."
The licensee notified NRC Resident Inspector.