ML20064H467

/01T-0 on 781130:noted That Emergency Diesel Generator Battery Racks Were Improperly Installed.Caused by Failure to Perform Requested Mods

ML20064H467
Person / Time
Site:	North Anna
Issue date:	12/13/1978
From:	Cartwright W VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:
Shared Package
ML20064H459	List: ML20064H458 ML20064H467
References
LER-78-125-01T, LER-78-125-1T, NUDOCS 7812200239
Download: ML20064H467 (3)

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I7 8 si EVENT OATE OATE EVENT DESCRIPTION AND PROBABLE CONSEQ'JENCES h O 2 lThe architect engineer informed sCation personnel that the emergency diesel generator !

. I O l 31 l battery racks were improperly installed as per seismic design drawings. Corrective l

'ITTT1 Imodifications required alternate removal of the IJ and 1H diesel generators from l <

o s l service. This event is reportable pursuant to Specificationa 6.9.1.8.1 and 6.9.1.9.b.I o s lNoodverse consequences are expected. I i6TTI I I 101811 I SYS FEM CAUSE CAUSE COMP. VALVE f CO 1E CODE SU8 CODE COMPONENT CODE SU8 CODE SU8 CODE EL]

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33 34 36 40 42 43 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS g i O lDuring field installation of the emereenev diesel eenerator battery racks reonested I 1 1 lemdifications were not made. Tentatively aooroved modificationn are s ch adol ed fnv I ITT n Icompletien on December 13, 1978. The modifications are eaual to or better than those I

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[TTT] l adequate is scheduled for completion on or before December 21. 1978. 1 7 8 9 80 S S  % POWER OTHER STATUS IS RY DISCOVERY OESCRIPTION l1 l 5 l (E_j@ l 0 l 9 l 7 l@l NA l [D_j@l A/E Notification I, ,

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NAME OF PREPARER W. R. Cartwrtght PHONE: 703-894-5151 "l'

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.'. . . Virginia Electric and Power Company North Anna Power Station, Unit No.1

Attachment:

Pag? 1 of 2 Docket No. 50-338 Report No. LER 78-125/IT-0 Seismically Deficient Emergency Diesel Generator Battery Racks Description of the Event Vepco operating personnel requested the Architect Engineer to compare the emergency diesel generator battery rack seismic design drawings to the manufacturers drawings used to install the racks. The Architect Engineer discovered that the wall mounts, the side rail supports and the bottom support rails differed from those specified by the seismic design drawings. Further investigation revealed that a request to modify the above mentioned components had been issued during construction but had not been implemented.

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' Seismic calculations showed the wall mounts and side rail supports would yield during a design basis earthquake (DBE). Preliminary seismic calculations indicate that the bottom rails will not yield during a DBE.

This event is reportable pursuant to Specification 6.9.1.8.1.

Modifications made to the battery racks to correct seismic deficiencies required alternate removal of the IJ and lH emergency diesel generators from service. One emergency diesel generator remained operable at all times.

This event is reportable pursuant to T.S. 3.8.1.1 and Specification 6.9.1.9.b.

Probable Consecuences of the Occurrence If a design basis earthquake occurred in the proximity of the North Anna Power Station, the errergency diesel generator racks may fail. Failure of the battery racks, which resulted in battery failure, may cause the emergency diesel generators to become inoperable. The station would rely on nonnal station electric power or offsite electric power.

t Removal of the lH and lJ emergency diesel generators was performed in accordance with T.S. Action Statement 3.8.1.1.a. No adverse consequences are expected.

Cause of Occurrence .

During field installation of the emergency diesel generator battery racks requested modifications were not made.

The IJ and 1H emergency diesel generators were removed from service to make modifications to the battery racks to correct seismic deficiencies.

Immediate Corrective Action Seismically approved wall mounts were installed. The battery racks were inspected by representatives of the vendor and Architect Engineer.

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l Virginia Electric and Power Company North Anna Power Station, Unit No.1

Attachment:

Page 2 of 2 Docket No. 50-338 Report No. LER 78-125/IT-0 Scheduled Corrective Action Tentatively approved side rails which meet or exceed those originally specified are scheduled for installation on December 13, 1978. Final seismic approval of the modifications and battery racks is pending a complete seismic analysis scheduled for completion on or before December 21, 1978.

Actions Taken to Prevent Recurrence c

No actions to prevent recurrence are required.

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