ML19257C491

LER 80-008/01T-0:on 800111,during Review for IE Circular 78-08,S&W Found Control Room Air Conditioning Chiller Units Control Panel Not Qualified to Seismic Category I Requirements.Cause Unknown.Vendor Reviewing Components

ML19257C491
Person / Time
Site:	North Anna
Issue date:	01/24/1980
From:	Cartwright W VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19257C480	List: ML19257C479 ML19257C491 ML19257C492
References
IEC-79-08, IEC-79-8, LER-80-008-01T, LER-80-8-1T, NUDOCS 8001290224
Download: ML19257C491 (2)

Text

NRC FOHM 366 U. S. NUCLEAR REGULATORY COMMISSION (7 77)

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6J 61 DOCKET NUYBER 6d fi) EVENT DATE 14 JS HEPOR T DATE 80 EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h o 2 l On January 11, 1980, during a review for IE Circular 78-08. Stone & Webster discovered I o 3 l that the control panel for the control room air conditioning chiller units was not I o 4 l q .alified to seismic Category I requirements. 'Ihe health and sa fe ty of the reneral I O s l Public were not af fected by this event. Reportable pursuant. to T.S. 6.9.1.R'. 1. l O 6 1 0 7 l l o a l l 7 8 9 SO SYSTEM CAUSE CAUSE COYP VALVE CODE CODE SUSCODE COMPONENT CODE SUSCODE SU8 CODE o 9 l S l G l@ [ B l@ lB l@ l H j Tl El Xl C l H l@ ]@ y @

7 8 9 to 11 12 13 18 19 20

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lg l 0] 0l 0l 31 40 l gg 41 42 N lg l43A l@ 44 Wl1l2l0l@ 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h i o l The exact cause of this discrepancy is not known at this time. The vendor is presentivl

i ;3y reviewing control panel electrical components and vibration test reports for equipment I qualification. Stone & Webster is reviewing seismic adequacy of the control panel and l

, 3 researching control equipment previously qualified for possible correlations. l 1 4l l l 7 8 9 80 ST S 2C.NE 9 ONER STATUS DS OV RY DISCOVERY DESCRIPTION i s Clg 0l 0l 0l g "A lDlgl Notification form A/E l AC TIVI TY CO' TENT ~

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Virginia Electric and Powe r Company North Anna Power Station, Unit #1

Attachment:

Page 1 of 1 Doc ke t No , 50-338 Report No. LER 80-008/017-0 Description of Event On January 11, 1980, during a review for IE Circular 78-03. Stone &

Webster discovered that the control panel for the control room air conditioning water chiller units was not qualified to seismic Category I requirements.

Probable Consequences of Occurrence In the event of a seismic occurrence, this panel and its internal control equipment could be damaged causing chiller malfunction. This , however, would not af fect plant operation because there is a combined total of six control room air conditioning chiller units (common to Units 1 and 2) of which only two are required to naintain control room ambient below the design temperature limits of electrical equipment required for the safe operation of the plant. Also, alternate meansof cooling the control room with outside air during the cold weather months could be accomplished. The health and safety of the general public were not endangered by this event.

The chiller unit tontrol panels for Unit 2 are identical and are similarly a f fected.

Cause of Occurrence ,

The exact cause of this discrepancy is not known at th is t ime . However, it appears that it may have resulted from a deficiency by the equipment man u f ac tu re r.

Immediate Corrective Action The vendor is reviewing control panel electrical components and vibration test reports for equipment qualification. Also, Stone E Webster is reviewing seismic adequacy of the control panel and researching control equipr2nt previously qualified for possible correlations.

Scheduled Corrective Action A shake test of one of the control panel assemblies will be attempted to verify its ability to withstand earthquakes.

Actions Taken to Prevent Recurrence No further actions are required.

1840 059