05000335/LER-1980-061-03, /03L-0:on 801027,dc Electric Buses Were Switched Into Configuration Such That One Dc Bus Provided Control Power for Both Component Cooling Water Loops.Caused by Electrical Maint Activity

/03L-0:on 801027,dc Electric Buses Were Switched Into Configuration Such That One Dc Bus Provided Control Power for Both Component Cooling Water Loops.Caused by Electrical Maint Activity

ML17266A371
Person / Time
Site:	Saint Lucie
Issue date:	11/26/1980
From:	Pace P FLORIDA POWER & LIGHT CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML17209A407	List: 05000335/LER-1980-061, Forwards LER 80-061/03L-0 05000335/LER-1980-061-03, /03L-0:on 801027,dc Electric Buses Were Switched Into Configuration Such That One Dc Bus Provided Control Power for Both Component Cooling Water Loops.Caused by Electrical Maint Activity
References
LER-80-061-03L, LER-80-61-3L, NUDOCS 8012050470
Download: ML17266A371 (3)

LER-1980-061, /03L-0:on 801027,dc Electric Buses Were Switched Into Configuration Such That One Dc Bus Provided Control Power for Both Component Cooling Water Loops.Caused by Electrical Maint Activity

Event date:
Report date:
3351980061R03 - NRC Website

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'hile o eratin at 1005 ower, maintenance activities re uired switchin of DC, Elect Buses into a configuration such that one DC Bus provided control power for both CCH loops.

Action was taken er tech s ec 3.7'. 1 and two independent CCH loops were reestablished in 45 minutes.

This was well within the 72 hour8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> limit.

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of not havin two inde endent CCW loo s See LER 77-31 No safet limits were exceeded.

Health and safety of the public was not effected.

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After maintenance activities were completed, the two independent CCH Loops were again established.

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CAUSE DESCRIPTION AND CORRECTIVE ACTION The plant was operating at 100% power with the "C" CCW Pump aligned to the "A" header and supplied from the "A" Electrical Buses (via the "AB" Buses).

The "B" CCW Pump was aligned to the "B" header and supplied from the "B" Electrical Buses.

A ground was detected on the "B"b'attery charger and it was taken out of. service for maintenance.

To maintain the "B" DC Bus, the "AB" Bus was separated fro'm the "A" Bus, thc "AB" charger placed on the "AB" Bus and the "B" Bus fed from the

",AB" Bus.

This configuration r'esulted in both the "B" and the "C" CCW Pump DC control power being fed frotn the "AB" charger and two "independent" CCW loops were not available.

The "B" battery charger was repaired and the DC Buses were realigned to provide two independent CCW loops within 45 minutes.