ML20009G041

Final Deficiency Rept Re Protuberance on Local Control Station Switches Supplied by Gould Rundel,Initially Reported 810625.Purchase Spec Revised to Specify Contact Maint During Position Change

ML20009G041
Person / Time
Site:	Saint Lucie
Issue date:	07/24/1981
From:	Robert E. Uhrig FLORIDA POWER & LIGHT CO.
To:	James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
References
10CFR-050.55E, 10CFR-50.55E, L-81-316, NUDOCS 8108030273
Download: ML20009G041 (3)

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• , P.o. BOX 529100 MI AMI, F L 33152 MCIAgg0py g ,, .

FLORIDA POWER & LIGHT COMPANY July <^4,1981 L-81-316 W '

Mr. James P. O'Reilly, Director, Region II (N ~

Office of Inspection and Enforcement g (f y g U. S. Nuclear Regulatory Commission J lif., A tla ta, er a 5 53 WL 31198W [3

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Dear Mr. O'Reilly:

'( 9 Re: St. Lucie Unit 2 V'1 g Docket No. 50-389 m Local Control Station Switch Protuberance On June 25, 1981, Florida Power & Light Company (FPL) reported to the Region II Office of Inspection and Enforcement a potential 10 CFR 50.55(e) condition involving local control switches supplied by Gould Rundel. A final report is attached for your review.

,j Very truly yours, Robert E. Uhrig W, /

l 1 Vice President

Advanced Systems & Technology REU/TCG/ah Attachment j cc

Director of Inspection and Enforcement U.S. Nuclear elegulatory Commission Washington, J. C. 20555 (with attachment)

Harold F. Reia, Esquire (w/o attachment)

, II l 8100030273 810724 j gDRADOCK05000g reOPLE . . SERVING PEOPLE

FINAL DEFICIENCY REPORT LOCAL CONTROL STATION SWITCH PROTUBERANCE i

Name of Station St. Lucie Plant - Unit 2 Owner Florida Power and Light Company Architect / Engineer Ebasco Services Incorporated

Date NRC Notified June 24, 1981

Final Report Filed July 24, 1981 t

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I Summary Post installation inspection of local control stations identified a cer-tain deficiency in the control switches supplied by Gould Rundel which could affect the starting mechanism of certain pumps (including fuel pool pumps). Because of the deficiency the pump will turn on but may not remain on when the switch is released.

This deficiency involved the switch development schedule in the purchase specification and was considered reportable under 10CFR50.55(e). FP&L (W. Hayward) notified the NRC (H Dance) on June 25, 1981. This final report is submitted to advise the NRC of the description of the deficiency and the corrective actions '.htc will be taken.

Il Description Gould Rundel supplied type SS4 and SS6 switches on local control stations were identified as having a deficiency whereby the pump will turn on but may not remain on when switch is released. Upon further investigation it has been determined that a protuberance on the cam portion of the switch momentarily opens up the start contact once the switch is released from start position. The contact relay is deenergized for a time long enough to stop the pump. Accordingly, a nonconformance report (NCR No.1842E) was written on this item.

The fuel pool pumps 2A and 28 are the only safety related components identified as containing these types of switches in their local control stations. An indication light is present if the pump is de-energized.

i ihe vendor was contacted and it was verified tha t the switches were

, supplied according to the purchase specification. However, the vendor interpretation of the purchase specification which includt.d a switch de-velopment schedule led to a situation whereby the actual pumps' control and operational requirements were not met.

III Corrective Action t The purchase specification is' being revised to specify contact main-tenance during position change and the vendor will be requested to provide additional switches as per the revised specification. However, as an interim measure, repair will be performed at the site whereby the cam pro-tuberance will be ground out. These repaired switches will be included j for system testing purposes only and not for plant operations. A list of i the affected switches is maintained and the switches are tagged to iden-l tify them. Once new switches are received, the repaired ones will be replaced with the new switches prior to the end of 1981 and according to a repair procedure.

IV Safety Implications The affected pumps include the fuel pool cooling pumps 2A and 2B which are safety related. The safety of operation of the nuclear power plant

could have been adversely affected sometime throughout the expected life time of the plant, if the switches that include the cam protuberance were to have remained uncorrected.

V Conclusion Corrective action as indicated in Section III of this report will be undertaken. This closes out this item for St. Lucie Unit 2 as regards-to 10CFR50.55(e) requirements.

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