05000457/LER-2003-003

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LER-2003-003, Inadvertent Auxiliary Feed Water Engineered Safety Feature Actuation Due to Placing a Clearance Order Ahead of the Outage Schedule
I
Event date:
Report date:
Reporting criterion: 10 CFR 50.73(a)(2)(iv)(A), System Actuation
Initial Reporting
4572003003R00 - NRC Website

TEAR SEQUENTIAL

J � REVLSILV I � NUMBER

Cause of Event

was overconfidence by the his decision to hang the 6.9 KV in place to control advancing procedure did not exist for de- There were two root causes for the event. � The first outage electrical team coordinator which led to bus C/Os ahead of schedule. � There was no process the schedule activities. � The second was that a IrrIRCFORM366A (1-2001) Braidwood, C.

energizing the 6.9 KV buses.

D. Safety Consequences:

The AF system has no safety function in cold shutdown. Both the 2A and 2B AF pumps were disabled and incapable of injecting water into the steam generators.

The AF system has no direct connection to the RCS and would not result in an RCS boron dilution event. Since the AP system is composed of non-contaminated water, no release of offsite radiation would occur. This event has no safety significance.

This event did not result in a safety system functional failure.

E. Corrective Actions:

The corrective actions to prevent recurrence are to develop a procedure to remove the 6.9 KV buses from service with appropriate precautions and limitations, and to develop a process to change outage schedule activities with proper oversight. Another corrective action is to provide a logic tie in the outage schedule between the ANS testing and the de-energization of the 6.9 XV buses.

F. Previous Occurrences:

There have been no occurrences of inadvertent ESF within the past three years.

G. Component Failure Data:

Manufacturer � Nomenclature � Model � Mfg. Part Number N/A � N/A � N/A � N/A