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Event Notification Report for January 7, 2008

U.S. Nuclear Regulatory Commission
Operations Center

Event Reports For
01/04/2008 - 01/07/2008

** EVENT NUMBERS **


43880 43884

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Power Reactor Event Number: 43880
Facility: DAVIS BESSE
Region: 3 State: OH
Unit: [1] [ ] [ ]
RX Type: [1] B&W-R-LP
NRC Notified By: ANTHONY STALLARD
HQ OPS Officer: JASON KOZAL
Notification Date: 01/04/2008
Notification Time: 08:05 [ET]
Event Date: 01/04/2008
Event Time: 02:50 [EST]
Last Update Date: 01/04/2008
Emergency Class: NON EMERGENCY
10 CFR Section:
50.72(b)(3)(ii)(A) - DEGRADED CONDITION
Person (Organization):
PATRICK LOUDEN (R3)

Unit SCRAM Code RX CRIT Initial PWR Initial RX Mode Current PWR Current RX Mode
1 N N 0 Refueling 0 Refueling

Event Text

PRESSURE BOUNDARY LEAKAGE DISCOVERED DURING REFUELING

"While in Mode 6 with the Reactor Head in place and fuel in the Reactor Vessel, weld overlay was in progress on the common Decay Heat Suction line from the Reactor Coolant System. The Reactor Coolant System is in a drained condition with RCS level approximately 24 inches above the Hot Leg Centerline. During the first weld pass on the suction line weld located in Containment, the welding operator noticed water seeping from the weld. Visual inspection revealed a small leak. The leakage is too small to quantify the leakrate. Surface examinations prior to welding revealed no abnormal conditions or leakage. Welding operations on this weld have been suspended. Planned Refueling activities continue to defuel the reactor vessel.

"One train of Decay Heat Removal remains in service providing core cooling. The second train is aligned in standby for Decay Heat Removal. Both Trains of Decay Heat Removal have been declared inoperable due to this leak, however both trains of Decay Heat Removal remain functional."

The licensee notified the NRC Resident Inspector.

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Power Reactor Event Number: 43884
Facility: HATCH
Region: 2 State: GA
Unit: [ ] [2] [ ]
RX Type: [1] GE-4,[2] GE-4
NRC Notified By: TONY SPRING
HQ OPS Officer: JEFF ROTTON
Notification Date: 01/06/2008
Notification Time: 15:22 [ET]
Event Date: 01/06/2008
Event Time: 11:00 [EST]
Last Update Date: 01/06/2008
Emergency Class: NON EMERGENCY
10 CFR Section:
50.72(b)(3)(v)(D) - ACCIDENT MITIGATION
Person (Organization):
STEVEN VIAS (R2)

Unit SCRAM Code RX CRIT Initial PWR Initial RX Mode Current PWR Current RX Mode
2 N Y 100 Power Operation 100 Power Operation

Event Text

HPCI DECLARED INOPERABLE DUE TO FAILED SURVEILLANCE TEST

"During HPCI pump operability surveillance in preparation for a system outage, the system failed to achieve rated flow and pressure in the time required by procedure and Tech Specs. The procedural requirement is <49 seconds and the Tech Spec requirement is < 50 seconds. The system achieved rated flow and pressure in 54 seconds. The system outage has been delayed until troubleshooting plans can be developed and implemented."


The licensee notified the NRC Resident Inspector.

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Thursday, March 29, 2012