Event Notification Report for July 24, 2009
U.S. Nuclear Regulatory Commission
Operations Center
EVENT REPORTS FOR
07/23/2009 - 07/24/2009
EVENT NUMBERS
45227
!!!!! THIS EVENT HAS BEEN RETRACTED !!!!!
!!!!! THIS EVENT HAS BEEN RETRACTED !!!!!
Power Reactor
Event Number: 45227
Facility: BROWNS FERRY
Region: 2 State: AL
Unit: [1] [] []
RX Type: [1] GE-4,[2] GE-4,[3] GE-4
NRC Notified By: TIMOTHY D. BOLAND
HQ OPS Officer: DONALD NORWOOD
Region: 2 State: AL
Unit: [1] [] []
RX Type: [1] GE-4,[2] GE-4,[3] GE-4
NRC Notified By: TIMOTHY D. BOLAND
HQ OPS Officer: DONALD NORWOOD
Notification Date: 07/24/2009
Notification Time: 18:50 [ET]
Event Date: 07/24/2009
Event Time: 14:15 [CDT]
Last Update Date: 09/22/2009
Notification Time: 18:50 [ET]
Event Date: 07/24/2009
Event Time: 14:15 [CDT]
Last Update Date: 09/22/2009
Emergency Class: NON EMERGENCY
10 CFR Section:
50.72(b)(3)(v)(B) - POT RHR INOP 50.72(b)(3)(v)(D) - ACCIDENT MITIGATION
10 CFR Section:
50.72(b)(3)(v)(B) - POT RHR INOP 50.72(b)(3)(v)(D) - ACCIDENT MITIGATION
Person (Organization):
STEVEN VIAS (R2DO)
STEVEN VIAS (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 |
HPCI INOPERABLE DUE TO OIL LEAK IN MECHANICAL TRIP HOLD VALVE
"During performance of surveillance 1-SR-3.5.1.7, HPCI Main and Booster Pump Set Developed Head and Flow Rate Test at Rated Reactor Pressure, the HPCI Turbine Stop Valve Mechanical Trip Hold Valve, 1-PCV-73-18C, developed an oil leak of approximately 0.25 gpm. HPCI was INOPERABLE at the time of discovery due to performance of SR and continued to be INOPERABLE due to the oil leak that developed.
"This event is reportable within 8 hours in accordance with 10CFR 50.72(b)(3)(v) as an event or condition that at the time of discovery could have prevented the fulfillment of a safety function. It also requires a 60 day written report in accordance with 10CFR 50.73(a)(2)(vii)."
The licensee notified the NRC Resident Inspector.
* * * RETRACTION ON 9/22/2009 AT 1700 EDT FROM RAYMOND SWAFFORD TO DONG PARK * * *
"On July 24, 2009, the High Pressure Coolant Injection (HPCI) Stop Valve Mechanical Trip Hold Valve (PCV-073-0018C) developed a ruptured diaphragm resulting an approximate 0.25 to 0.5 gallon per minute oil leak during scheduled performance of Surveillance Instruction, HPCI Main and Booster Pump Set Developed Head and Flow Rate at Rated Reactor Pressure. At the time BFN [Browns Ferry Nuclear] made [event] notification 45227, there were concerns regarding the ability of HPCI to fulfill its safety function, hence, BFN made an eight hour notification in accordance with 10CFR50.72(b)(3)(v)(B) and 10CFR50.72(b)(3)(v)(D).
"An evaluation performed in response to this notification concluded that the HPCI System was capable of performing its intended safety function with the oil leak. TVA Engineering evaluated the rate of oil loss considering a worse case failure of PCV-073-0018C diaphragm and determined that the turbine oil system capacity is such that the oil loss thru the failed diaphragm would not impact HPCI operation during its mission time for the Design Basis accidents and transients for which HPCI is credited.
"The circumstances discussed in the notification did not result in any condition that at the time of discovery could have prevented the fulfillment of the safety function of structures or system that are needed to remove residual heat and mitigate the consequences of an accident. Therefore, this event is not reportable under 10CFR50.72(b)(3)(v)(B) and 10CFR50.72(b)(3)(v)(D).
"TVA documented the evaluation of this event notification in its corrective action program (PER 177206).
"The licensee has notified the NRC Resident Inspector."
Notified R2DO (Rudisail).
"During performance of surveillance 1-SR-3.5.1.7, HPCI Main and Booster Pump Set Developed Head and Flow Rate Test at Rated Reactor Pressure, the HPCI Turbine Stop Valve Mechanical Trip Hold Valve, 1-PCV-73-18C, developed an oil leak of approximately 0.25 gpm. HPCI was INOPERABLE at the time of discovery due to performance of SR and continued to be INOPERABLE due to the oil leak that developed.
"This event is reportable within 8 hours in accordance with 10CFR 50.72(b)(3)(v) as an event or condition that at the time of discovery could have prevented the fulfillment of a safety function. It also requires a 60 day written report in accordance with 10CFR 50.73(a)(2)(vii)."
The licensee notified the NRC Resident Inspector.
* * * RETRACTION ON 9/22/2009 AT 1700 EDT FROM RAYMOND SWAFFORD TO DONG PARK * * *
"On July 24, 2009, the High Pressure Coolant Injection (HPCI) Stop Valve Mechanical Trip Hold Valve (PCV-073-0018C) developed a ruptured diaphragm resulting an approximate 0.25 to 0.5 gallon per minute oil leak during scheduled performance of Surveillance Instruction, HPCI Main and Booster Pump Set Developed Head and Flow Rate at Rated Reactor Pressure. At the time BFN [Browns Ferry Nuclear] made [event] notification 45227, there were concerns regarding the ability of HPCI to fulfill its safety function, hence, BFN made an eight hour notification in accordance with 10CFR50.72(b)(3)(v)(B) and 10CFR50.72(b)(3)(v)(D).
"An evaluation performed in response to this notification concluded that the HPCI System was capable of performing its intended safety function with the oil leak. TVA Engineering evaluated the rate of oil loss considering a worse case failure of PCV-073-0018C diaphragm and determined that the turbine oil system capacity is such that the oil loss thru the failed diaphragm would not impact HPCI operation during its mission time for the Design Basis accidents and transients for which HPCI is credited.
"The circumstances discussed in the notification did not result in any condition that at the time of discovery could have prevented the fulfillment of the safety function of structures or system that are needed to remove residual heat and mitigate the consequences of an accident. Therefore, this event is not reportable under 10CFR50.72(b)(3)(v)(B) and 10CFR50.72(b)(3)(v)(D).
"TVA documented the evaluation of this event notification in its corrective action program (PER 177206).
"The licensee has notified the NRC Resident Inspector."
Notified R2DO (Rudisail).