ML20076F131

Interim Deficiency Rept Re Failure of Two Darling Valve Co motor-operated Globe Valves in RHR Sys.Initially Reported on 830330.Procedure Devised by Vendor to Preclude Malfunction

ML20076F131
Person / Time
Site:	Shoreham File:Long Island Lighting Company icon.png
Issue date:	05/06/1983
From:	James Smith LONG ISLAND LIGHTING CO.
To:	Allan J NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
References
10CFR-050.55E, 10CFR-50.55E, SNRC-880, NUDOCS 8306010432
Download: ML20076F131 (4)

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y.~n.--l LONG ISLAND LIGHTING COMPANY SHOREHAM NUCLEAR POWER STATION bem--t P.O. BOX 618, NORTH COUNTRY ROAD + WADING RIVER. N.Y.11792 Direct Dial Number May 6, 1983 SNRC-880 Mr. James M. Allan Acting Regional Administrator Office of Inspection & Enforcement - Region 1 U.S. Nuclear Regulatory Commission 631 Park Avenue King of Prussia, PA 19406 Long Island Lighting Company -

Shoreham Nuclear Power Station - Unit 1 Docket No. 50-322

Dear Mr. Allan:

On March 30, 1983, in accordance with 10CFR.55 (e) , we reported verbally to Region 1 a potential deficiency concerning two Motor Operated Globe Valves located in the Residual Heat Removal System, which failed to operate properly. This letter serves as our 30-Day written report on this Potential Deficiency.

Description of Potential Deficiency The two globe valves which failed were manufactured by the Anchor Darling Valve Company of Williamsport, Pennsylvania and are iden-tified by Anchor Darling Company designations: "A/D E5836-20-1" and "A/D E5836-4-1", (Shoreham designations are lEll*MOV-042A and 1 Ell *MOV-038A). These globe valves are located in Shoreham's Residual Heat Removal System.

The first indication of a problem occurred during testing of valve 1 Ell *MOV-038A when it was discovered that the stem clamp was missing. Although this was considered an isolated case, the appropriate startup procedure was revised to include a check to insure that the stem clamp was properly oriented on the stem, with the key properly installed, and the setscrew properly tightened. More recently, a similar problem was encountered when, during startup testing, it was discovered that valve lEll*MOV-042 had failed to stroke, although the open/ closed position indicator lights signalled that the valve had stroked.

This was because the position indicating lights on the control panels are actuated through limit switches which are associated with the motor operator. The failure of the valve to stroke was 8306010432 830506 PDR ADOCK 05000322 g\

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4 SNRC-880 May 6, 1983 ,

Page 2 caused by.?.he valve stem clamp setscrew loosening, allowing the stem clamp to slide along the stem and the stem clamp key to fall from its keyway. This permitt'ed the stem to rotate with the stem nut, thus preventing the valve from stroking. It is believed that the setscrew in the stem clamp loosened due to normal system vibration.

Upon being notified by Stone & Webster Engineering Corporation that other Anchor Darling valves at Shoreham may be subject to similar failures, it was determined that a Potential Reportable Condition under 10CFR50.55(e) exists.

Corrective Action

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Stone ' & Webster has performed a revie'.' of Shoreham's safety-related valves and' has determined that, at Shoreham, only globe valves manufactured by Anchor Darling are susceptible to the type of failure described above. Shoreham has 14 valves of this deeign.

Anchor Darling has provided a procedure, which may be used to .

preclude any future possibility of stem clamp setscrews becoming loose as a result of vibration. The procedure involves tighten-ing the setscrew securely and then peening the thread _to provide a positive locking mechanism. .

An E&DCR will be issued to insure that the stem clamp setscrei in' all of Shoreham's Anchor ~ Darling globe valves in Category 1 ser-vice are locked by the method described above. This locking procedure will be incorporated into the apprcpriate reference manuals should dinassembly/ reassembly of any vaa.ve of this design be required. The peening of the setscrews for all 14 valves will "% ^

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SNRC-880 May 6, 1983 Page 3 If you have-any questions concerning this matter please do not hesitate to contact us.

Very truly ycurs, L. -

. L." Smith Manager,'Special. Projects Shoreham Nuclear Power Station WMJ/ laws 3 cc: Mr._ Richard DeYoung, Director

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NRC Office of Inspection & Enforcement Division of Reactor Operating Inspection-20555 Washington, D.C.

Mr.:J. Higgins,-Site NRC

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);arla J. Letsche, Esq., Hill Doard Panc1 ~ -

Kirkpatrick, Lockhart,

• U.S. Nuclear negulatory Com:aission Christopher & Phillips Washington, D.C. 20555 Sth Ploor

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. Washington , 'D.C. 20036 Dr. Peter A. Morris P Administrative Judge - -

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, 9 East doth Street Bernard M. Bordenick, Esq. - Ucw York, Scu York 10010 David A. Depka, Esq. -

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