ML20237G578

Part 21 & Deficiency Rept 142 Re Defect in Starting Air Distributor Sys of Dsr Standby Diesel Generator.Drain Sys Will Be Permanently Installed in Start Air Distributor

ML20237G578
Person / Time
Site:	River Bend, Rancho Seco, 05000000, Shoreham
Issue date:	08/07/1987
From:	Guntrum B IMO DELAVAL, INC.
To:	NRC
References
REF-PT21-87, REF-PT21-87-157-000 142, PT21-87-157, PT21-87-157-000, NUDOCS 8708140130
Download: ML20237G578 (3)

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' trno Delaval Inc.

Enterprise Engine Division Enterprise Ly and 85th Avenue I l'. O. Ilox 2161 D Oakland.

415 577-7400 CA 9462 August 7, 1987 I

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Director, Office of Inspection and Enforcement US Nuclear Regulatory Commission Washington, DC 20553 ,

Report #142 ll

Dear Sir,

u In accorance with the requirements of Title 10, Chapter 10, Code of Federal Regulations, Part 21, IMO Delaval Inc.

hereby notifies the Commission of a potential defect in a component of a DSR Standby Diesel Generator. There exists a potential problem with the starting air distributor system. j IMO Delaval has supplied DSR engines with this potential 1 defect to the following sites:

UTILITY SITE SERIAL NO. MODEL

LILCO Snoreham 74010-12 DSR-46 GULF STATES Hiver Band 74039-40 DSH-48 j SMUD Rancho Seco 81015-16 DSR-48 l I

On July 31, 1987, IMO Delaval was advised of a failure to start a Standby Diesel Generator engine occurring at Gulf i States, River Bend Station. Investigations performed by Gulf I States and by IMO personnel conclude that this failure to start was caused by an accumulation of oil in the start air 5 distributor. The start air distributor is a vital component in the system delivering start air pressure on a timed basis  ;

to the individual engine cylinders. With passages blocked by oil, the distributor is unable to perform its design i function.

Our investigations reveal that during prelube and normal -;

engine operations, oil can migrate through existing lube oil system and components and may accumulate in the start air distributor. The speed at which oil might accumulate is primarily dependent upon component tolerances. j While oil in the start air distributor is acceptable, an accumulation of in excess of approximately 2 - 5 cubic inches of oil may render the system inoperative and the engine unavailable for service.

8708140130 870007 PDR ADOCK 05000312 /elQ S PDR sf pl f

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Page 2 August 7, 1987 US Nuclear Regulatory Commission Corrective action requires'that a drain system be permanently installed in the start air distributor. IMO Delaval is currently designing a system compatable'with other engine systems and will provide this'information to the individual sites by September 1, 1987. (

In the interim IMO Delaval recommends that all start air distributors at the above sites be inspected immediately and drained of excess oil. Note that there are two (2) distributors installed per engine for redundent operation.

This inspection should be repeated on a regular basis (daily) in order that an' accumulation rate be established. This will ,

likely differ between engines. If oil is accumulating, it should be drained on a schedule based on the above. inspection until such time that a permanent drain system can be '

installed.

A copy of this letter will be sent to all of the sites e referenced in paragraph 2 of this. letter as indicated.by-the carbon copy list.

Our evaluation of this matter was concluded on August 5, 1987. 1 Very truly yours. f 1

wa _ _ _ _ _

Bruce C. ' rum Manager, Quality Assurance BCG/dfa ,

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Page 3 August 7, 1987 l US huclear Regulatory Commission t

c.c. Long Island Lighting Company'h Shoreham Nuclear Power Station North Country Road-Wading River, New York 11791 r

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Attn: Mgr. Nuclear Operat, ions Support Dept. 1

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f u Gulf States Utilities Compani Stone & Webster Engineering Company  !'

Cherry Hill Operations Center 3 Executive Campus r P.O. Box 5200 .

l Cherry Hill, New Jersey s 08034 'I Attn: Project Manager (J.O. #12210)  !

Gulf States Project  ?-

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Sacramento Municipal Utility District P.O. Box 158L0 j Sacramento,lCA 95813

) y Attn: Mr. Cranston Nuclear Engineering Dept. M.S. 208 l

Judy R. Beal <

Purchasing . Dept. M.S. 50

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