ML20039G193

Interim Deficiency Rept Re Potential Defect within Standby Diesel Generators Mfg by Transamerica Delaval,Initially Reported 811125.Rework of Piston & Reassembly of Three Diesel Generators Should Be Completed by 820131

ML20039G193
Person / Time
Site:	Shoreham File:Long Island Lighting Company icon.png
Issue date:	12/23/1981
From:	Milligan M LONG ISLAND LIGHTING CO.
To:	Haynes R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
References
10CFR-050.55E, 10CFR-50.55E, SNRC-649, NUDOCS 8201150371
Download: ML20039G193 (2)

Text

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gg LONG ISLAND LIGHTING COMPANY 5

wawaxw SHOREHAM NUOLEAR POWER STATION P.O. BOK 618. NORTH COUNTRY RCAD e WADING RIVER. N.Y.11792 Dece2er 23, 1981 SNRC-649 g ^4 Mr. Ronald C. Haynes Office of Inspection & Enforcement,

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U.S. Nuclear Regulatory Commission 631 Park Avenue 9_.

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• sg 9 SHOREHAM NUCLEAR POWER STATION - UNIT 1 DOCKET NO. 50-322

Dear Mr. Haynes:

On November 25, 1981, in accordance with 10 CFR 50.55(e), we reported verbally to Region 1 of a deficiency within our Diesel Generators manufactured by Transamerica DeLaval. This letter serves as our 30-day written report of this deficiency, and des-cribes our corrective action.

Description of Deficiency On November 24, 1981, LILCO was informed by Region I that Trans-america DeLaval informed the Commission of a potential defect concerning standby diesel generators in accordance with the rc-quirements of 10 CFR 21. This defect affects a spherical washer used in the fastening of the piston crown to the associated piston skirt. DeLaval has informed us that a failure of these spherical washers was experienced on one piston of a diesel at another nuclear site, resulting in separation of the piston crown from the skirt. We have reviewed our diesel generators in view of this potential problem and on November 24, 1981 deter-mined that our diesel pistons could be subject to this defect.

It was also determined that if a failure were to occur coinci-dent with the diesel being required to operate, it could prevent it from performing its design basis function.

i As a result of this study, it was determined that this situation constitutes a reportable deficiency-under 10 CFR 50.55(e).

8202150371 811223 PDR ADOCK 05000322 PDR

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SNRC-649 December 23, 1981 Page 2 Corrective Action Transamerica DeLaval has developed a modified assembly arrange-ment using opposing stacks of belville washers in lieu of the presently used spherical washers. This modification requires teardown of the diesels for piston removal with subsequent re-machining of the pistons to accept the change.

LILCO has contracted with DeLaval to perform the required tear-down and reassembly following the piston rework using their specialized personnel. As of the writing of this report the teardown of all three diesels has been completed and the pistons including on site spares have been shipped to DeLaval for the rework at their f acili ties . The rework of pistons should be completed in early January, 1982 and reassembly of the three diesels completed by January 31, 1982.

Very truly yours,

/ w L.

M. H. Milligan HE/ law cc: Mr. Richard DeYoung, Director NRC Office of Inspection & Enforcement Division of Reactor Operation Inspection Washington, D.C. 20555 Mr. J. Higgins, Site NRC

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