05000336/LER-1979-023-03, /03X-1:on 790803,seismic Bracings for Cells in 201A & B Batteries Removed to Allow Insp.Batteries Declared Inoperable.Caused by Reduction in Cell Voltages. Replacement of 201A Battery complete;201B Work in Progress

/03X-1:on 790803,seismic Bracings for Cells in 201A & B Batteries Removed to Allow Insp.Batteries Declared Inoperable.Caused by Reduction in Cell Voltages. Replacement of 201A Battery complete;201B Work in Progress

ML19254F267
Person / Time
Site:	Millstone
Issue date:	11/01/1979
From:	NORTHEAST UTILITIES
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19254F266	List: 05000336/LER-1979-023, Forwards LER 79-023/03X-1 05000336/LER-1979-023-03, /03X-1:on 790803,seismic Bracings for Cells in 201A & B Batteries Removed to Allow Insp.Batteries Declared Inoperable.Caused by Reduction in Cell Voltages. Replacement of 201A Battery complete;201B Work in Progress
References
LER-79-023-03X, LER-79-23-3X, NUDOCS 7911070445
Download: ML19254F267 (2)

LER-1979-023, /03X-1:on 790803,seismic Bracings for Cells in 201A & B Batteries Removed to Allow Insp.Batteries Declared Inoperable.Caused by Reduction in Cell Voltages. Replacement of 201A Battery complete;201B Work in Progress

Event date:
Report date:
3361979023R03 - NRC Website

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JRC FORM 3GG LICENSEE EVENT REPORT Update Report - Previous report date 3/30/79 CONTnOL BLCCK: l l

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2 l During steady state power operation, the seismic bracing for various cells in the 1 o l31 1 201 A and B batteries was removed to allow for cell inspection and/or replacement.

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This resulted in the batteries being declared inoperable in accordance with Section I

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cell replacements, the seismic bracing was reinstalled and the battery declared I

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Attachment LER 79-23/03X-1 tiillstone Unit 2 Docket flo. 50-336 EVEllT DESCRIPTI0fl During steady state power operation, the seismic bracing for various cells in the 201A and B batteries were removed to allow for cell inspection and/or replacement as outlined below.

DATE BATTERY EV0LUTION 10/2/79 201B Cell inspection 10/3/79 201A Cell inspection 10/5/79 201B Replacement of cell 28 10/11/79 201B Replacenent of cell 43 10/17/79 201B Replacement of cell 41 10/21/79 201B Replacement of cell 15 T:iese cell inspections and/or replacements resulted in the batteries being declared inoperable in accordance with Section 3.8.2.3.b of the Technical Specifications.

Upon the completion of each inspection and/or cell replacement, the seismic bracing was reinstalled and the battery declared operable within two (2) hours in each case.

CAUSE DESCRIPTIO!!

The cell inspections and replacements are the result of a reduction in individual cell voltages, although the cells were still operable.

This condition was the subject of an informational Mtter to the Office of Inspection and Enforcement on 8/20/79 which discussed the cause of cell deterioration.

The replacement of the 201A battery utilizing temporary seismic bracing was completed on 10/25/79.

The replacement of the 201B battery is expected in the next several weeks.

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