Event Notification Report for February 03, 2007
U.S. Nuclear Regulatory Commission
Operations Center
EVENT REPORTS FOR
02/02/2007 - 02/03/2007
EVENT NUMBERS
43140
Power Reactor
Event Number: 43140
Facility: PALO VERDE
Region: 4 State: AZ
Unit: [] [2] []
RX Type: [1] CE,[2] CE,[3] CE
NRC Notified By: TIM GRAFFNEY
HQ OPS Officer: JOHN MacKINNON
Region: 4 State: AZ
Unit: [] [2] []
RX Type: [1] CE,[2] CE,[3] CE
NRC Notified By: TIM GRAFFNEY
HQ OPS Officer: JOHN MacKINNON
Notification Date: 02/03/2007
Notification Time: 19:51 [ET]
Event Date: 02/03/2007
Event Time: 12:32 [MST]
Last Update Date: 02/03/2007
Notification Time: 19:51 [ET]
Event Date: 02/03/2007
Event Time: 12:32 [MST]
Last Update Date: 02/03/2007
Emergency Class: NON EMERGENCY
10 CFR Section:
50.72(b)(3)(ii)(B) - UNANALYZED CONDITION
10 CFR Section:
50.72(b)(3)(ii)(B) - UNANALYZED CONDITION
Person (Organization):
CLAUDE JOHNSON (R4)
CLAUDE JOHNSON (R4)
| Unit | SCRAM Code | RX Crit | Initial PWR | Initial RX Mode | Current PWR | Current RX Mode |
|---|---|---|---|---|---|---|
| 2 | N | Y | 100 | Power Operation | 100 | Power Operation |
TECHNICAL SPECIFICATION 3.0.3 ENTERED DURING ROUTINE SURVEILLANCE TESTING OF CONTROL ELEMENT ASSEMBLIES (CEA'S)
"On 2/3/2007 at approximately 12:32 MST, Palo Verde Control Room operators were performing a routine surveillance test. The purpose of this test is to demonstrate the operability of each full strength CEA not fully inserted in the core by verifying freedom of movement (trippability) by moving each individual full strength CEA that is not fully inserted in the core at least 5 inches (SR 3.1.5.3).
"While performing this test on Shutdown Group 'B', Subgroup 6, the 4 CEA's in the sub-group failed to withdraw after successfully inserting the CEA's the requisite 5 inches. The CEA's were inserted beyond the limit of 144.75" withdrawn as required per PVNGS TS LCO 3.1.6 to a position of 144" withdrawn. It was determined that this was not an analyzed condition.
"On 2/3/2007 at 13:15 MST, the Control Room staff identified the unanalyzed condition and PVNGS Unit 2 entered TS 3.0.3. It was determined that the unanalyzed condition had existed since 12:32 MST.
"On 2/3/2007 at 16:16 MST, following corrective maintenance to replace a phase sequence card, the 4 CEA's were recovered above the TS 3.1.6 insertion limit of 144.75", and Unit 2 exited LCO 3.0.3.
"The event did not result in the release of radioactivity to the environment and did not adversely affect the safe operation of the plant or health and safety of the public. The required offsite power sources are operable and the electrical grid is stable.
"The NRC resident inspector has been notified of this event."
"On 2/3/2007 at approximately 12:32 MST, Palo Verde Control Room operators were performing a routine surveillance test. The purpose of this test is to demonstrate the operability of each full strength CEA not fully inserted in the core by verifying freedom of movement (trippability) by moving each individual full strength CEA that is not fully inserted in the core at least 5 inches (SR 3.1.5.3).
"While performing this test on Shutdown Group 'B', Subgroup 6, the 4 CEA's in the sub-group failed to withdraw after successfully inserting the CEA's the requisite 5 inches. The CEA's were inserted beyond the limit of 144.75" withdrawn as required per PVNGS TS LCO 3.1.6 to a position of 144" withdrawn. It was determined that this was not an analyzed condition.
"On 2/3/2007 at 13:15 MST, the Control Room staff identified the unanalyzed condition and PVNGS Unit 2 entered TS 3.0.3. It was determined that the unanalyzed condition had existed since 12:32 MST.
"On 2/3/2007 at 16:16 MST, following corrective maintenance to replace a phase sequence card, the 4 CEA's were recovered above the TS 3.1.6 insertion limit of 144.75", and Unit 2 exited LCO 3.0.3.
"The event did not result in the release of radioactivity to the environment and did not adversely affect the safe operation of the plant or health and safety of the public. The required offsite power sources are operable and the electrical grid is stable.
"The NRC resident inspector has been notified of this event."