ML18127A649

LER 1978-025-00 for St. Lucie Unit 1, on 07/28/78 Concerning Notification by Applicant'S Vendor of Potential Problem with Certain Motor Operated Valves

ML18127A649
Person / Time
Site:	Saint Lucie
Issue date:	08/25/1978
From:	Schmidt A Florida Power & Light Co
To:	O'Reilly J NRC/RGN-II, NRC/IE
References
PRN-LT-78-237 LER 1978-025-00
Download: ML18127A649 (6)

Text

dk REGULATORY INFORMATlON DISTRIBUTION SYSTEM (BIDS>

DISTRIBUTION FOR INCOMING MATERIAL 50-335 REC: OREILLY J P DOCDATE: 08l25/78 NRC DATE RCVD: 09/05/78 DGCTYPE: LETTER NQTAR IZED: NO COPIES RECEIVED

SUBJECT:

LTR 1 ENCL 1 FORWARD1NG LICENSEE EVENT REPT (RG 50-335/78-029) ON 07/28/78 CONCERNING NOTIFICATION BY APPLICANT"S VENDQR OF POTENTIAL PROBLEM WITI-I CERTAIN MOTOR OPERATED VALVES... WlATT.

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I FLORIDA POWER S<<LIGHT QOII<<IPANy August 25, 1978 PRN-LZ-78-2c3>7 P

Mr. James P. O'Reilly, Director, Region Office of Inspection and Enforcement II <<N <<(ie

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Dear Mr. O'Reilly:

REPORTABLE OCCURRENCE 335-78-29 ST. LUCIE UNIT 1 DATE OF OCCURRENCE: JULY 28, 1978 TECHNICAL SPECIFICATION 6.9.1.9.C MOTOR OPERATED VALVES The attached Licensee Event Report is being submitted in accordance with Technical Specification 6.9 to provide 30-day notification of the subject occurrence.

Very truly yours, RB D. Schmidt Vice President Power Resources MAS/sn Attachment cc: Harold F. Reis, Esquire Director, Office of Inspection and Enforcement (30)

Director, Office of Management Information and Program Control (3) 78248QJ33 PEOPLE .. SERVING PEOPLE

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safety-related MOVs outside containment were inspected and,

,"..if 'necessary, repaired.;.All suspect safety-related MOVs inside containment will be inspected and, if necessary,

~o!1 re aired at the first shutdown of sufficient length, but no later than the next refueling.

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REPORTABLE OCCURREN 335-78-29

'aLicensee e Two Event Repor ADDITIONAL EVENT DESCRIPTION and PROBABLE CONSEQUENCES Our NSSS vendor notified us that another plant had experienced a motor operated valve (MOV) failure and that we had some safety-related MOV's with a potential for the same failure. After inves-tigation, other suspect MOV's were indentified in safety-related systems not supplied by the NSSS vendor. All suspect safety-re-lated MOV's outside containment were inspected and repaired necessary.

if All suspect safety-related MOV's inside containment will be inspected and, if necessaiy, repaired at. the first shutdown of sufficient length, but no later than the next refuels:ng (now scheduled'or.-April, 1979) It should be noted that of the 10 such operators insid'e containment, 4 are locked open and de-energized during power. operation (per Technical Specifications), 4 are locked closed and never opened'uri.ng power operation and. two (normally open,and not cycled)'ave no. safety-related function at power. Al-though we have had no failures during 3 years of testing and opera-tions, there is a potential for failure so this report is being made in accordance with Specification 6.9.1.C.

'ADDITIONAL CAUSE DESCRIPTION and CORRECTIVE ACTIONS Some of these motor-operators have been assembled by valve vendors with the operator locking nut "staked" improperly. The locking nut keeps the stem nut, which connects the motor drive sleeve to the valve stem, from moving axially. Such movement could disengage the stem nut from the valve stem and drive sleeve, thus rendering the valve inoperable. Installed valves with improperly staked locking nuts have been or will be staked correctly as noted in the Event Description.