05000255/LER-2004-001

LER-2004-001,

Docket Number
Event date:
Report date:
Reporting criterion:	10 CFR 50.73(a)(2)(iv)(A), System Actuation
2552004001R00 - NRC Website

FACILITY NAME (1) DOCKET NUMBER (2) LER NUMBER (6),. PAGE (3) Palisades 05000-255 2004 --�� 001 --� � 00

EVENT DESCRIPTION

On August 31, 2004, at 0715 hours0.00828 days <br />0.199 hours <br />0.00118 weeks <br />2.720575e-4 months <br />, the plant was operating at approximately 100% power. A rapid plant down power was commenced following report of a fire in the vicinity of the P-2B condensate pump [P;SD] lower motor [MO] bearing. At 0718 hours0.00831 days <br />0.199 hours <br />0.00119 weeks <br />2.73199e-4 months <br />, the reactor was manually tripped from approximately 95% power, in conjunction with securing P-2B condensate pump, and the imminent loss of main feedwater [SJ]. Following the reactor trip, the auxiliary feedwater system [BA] started automatically to maintain steam generator [SG] water level. The plant was stabilized in Mode 3.

This event is reportable in accordance with 10 CFR 50.73(a)(2)(iv)(A) as an event that resulted in a manual actuation of the reactor protection system [JC] and automatic actuation of the auxiliary feedwater system.

CAUSE OF THE EVENT

Overheating, and ultimately fire, at the condensate pump lower motor bearing were caused by pump and motor misalignment following maintenance in July 2004. The pump and motor misalignment occurred as a result of inadequate maintenance instructions.

SAFETY SIGNIFICANCE

The safety significance of this event was minimal. All safety systems functioned as expected during the plant trip.

CORRECTIVE ACTIONS

Proper alignment criteria were established and incorporated into the work instruction when the repaired motor was reinstalled in September 2004.

PREVIOUS SIMILAR EVENTS

None.