ML20140D669

Part 21 & Deficiency Rept Re Blocked Venturi Holes in Air Start Motor Lubricator Assembly of EMD 20-645E4 Emergency Diesel Generators.Initially Reported on 860127.Further Info Will Be Forwarded When Available

ML20140D669
Person / Time
Site:	Davis Besse
Issue date:	01/28/1986
From:	Grayson M MORRISON-KNUDSEN ENGINEERS, INC.
To:	Taylor J NRC
References
REF-PT21-86, REF-PT21-86-034-000 L-QTS-86-1, PT21-86-034-000, PT21-86-34, NUDOCS 8602030092
Download: ML20140D669 (6)

Text

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a g ENGINEERS AND BUILDERS MK-FERGUSON COMPANY L-QTS-86-1 A B00 MESON KNUDSEN COMPANY MORRISON ENUDSEN PLAZA

' PO BOX $8. BOISE. IDAHO U S A 83707 PsONe mesassocoantx sem9

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January 28, 1986 g_p Mr. James Taylor USNRC 1717 H Street Washington, D.C. 20555

Dear Mr. Taylor:

Enclosed please find supporting documentation concerning a Reportable 10CFR Part 21 Condition discu: "4 this date by Mssrs. Ed Baker of USNRC, and Dorsel Baden of MK-Ferguson Company.

The telephone conversation between Mssrs. Baker and Baden occurred within 24

hours of receiving information concerning this Reportable Condition from our diesel generator manufacturing facility in Rocky Mount, North Carolina.

We will be forwarding further information as it becomes available. You may call me at 208/386-7030 if you desire any further information concerning this subject.

Very truly yours, 1

M . 'D drayso Director Quality & Technical Support MDG/DCB/bkw

1607q l

Enclosure cc: H. Falter (Rocky Mount - w/ attachments)

. F. Jones (Rocky Mount - w/ attachments)

R. Kulchak (w/ attachments)

D. Baden (w/ attachments)

File l

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I 9602030092 DR 060128 g ADocK 05000346 PDR gy k

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TIME:

TELECOPY DATE: January 27, 1986 COMPANY: Morrison-Knudson Company Inc.

ADDRESS:

CITY & STATE:- Boise, Idaho ATTENTION: Mr. Murlin D. Grayson (Quality Dept.)

10CFR Part 21

REFERENCE:

M-K/PSD tio. 10CFR21-0029 1

TELECOPY NO.:

MESSAGE p

SUBJECT:

EMD - Air Start Motor Lubricator Assembly (REFER TO ATTACHED LETTER) l The attached letter is being sent to ydu for review and action in accordance with M-K policy.

Please acknowledge receipt of this notice and advise us of any notifi-cation to the NRC.

t cc: W. Frank Jones FROM: Harry W. Falter, Principal Engineer POWEA SYSTEMS

,# A MORRISON KNVOSEN OM310N TRANSMITTED HEREWITH ARE (5)

PAGES. INCLUDING THE COVER SHEET.

IF YOU DO NOT RECElVE ALL PAGES LISTED, PLEASE CALL (019)-977 2720, .

EXTENSION NOS. 210 OR 212 FOR VERIFICATION. ' '

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o Jf4127 'E6 16:53 tr.FPIS0tH flUF:Ett PO~( MT ti.C. P.2

& MORRISON KNUDSEN COMPANY,INC.

POWum Sf97 Ease Oly:S(0ps P

January 27, 1986 Morrison-Knudsen Company, Inc.

Post Office Box 7808 Boise, Idaho 83729 Attention: Mr. Murlin D. Grayson Quality Department

Reference:

10CFR Part 21 EMD - Air Start Motor Lubricator Assembly Gentlemen:

We have just received a notification from our Field Service Engineer, who is checking the EMD 20-645E4 emergency diesels at the Toledo Edison Nuclear Plant, that the venturi hole in the lubricator for the diesel air starting motor was not drilled on two assemblies, The blocked venturi hules will prevent lubricating oil (from the lubricator buul) frua reaching tne starting air going to the air starting motor.

The lack of lubrication or inadequate lubrication could cause rapid wear of the air start motor vanes or cause the vanes to stick.

Improperly lubricated vanes could cause the air start motor to malfunction and prevent a qualified engine start.

This is a manufacturing defect which went undetected for quite a while.

The air motors in this case did not appear to be defective. It is theorized that the check valve (item 2, C1079DR) did not seal properly and lube oil returned to the air through this valve.

Notice should be given to owners to check the sight glass in the lubricator to verify that oil is being furnished to the starting air going to the motors during the engine start sequence.

Very truly yours,

,,n,,,,,,,,

MORRISON-KNUDSEN COMPANY, INC. NU. 8.9/,

POWER SYSTEMS DIVIS /# gGESS/,, .

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- 2 Sill 'gr Harry W. Falter, P.E.

E5 1033 lq.* 4 Principal Engineer ../[b4'Igp

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, "L LI AM""""""f Attachments (3)

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DUAL AIR STARTING MOTOR MAINTENANCE SYSTEM (INDUSTRIAL)

The starting motor requires very little mainte-DESCRIPTION nance other than lubrication. Any noticeable loss T.he complete air start.ing 8Yrtem consists of two p air startm.g motors, Fig.14 7, air tanks, strainer damaged vanes. Rapid wear of the vanes is a

solenold valve, air start valve, air 1me lubricator, usually caused by inadequate lubrication or the shutoff valve, and a start button. presence of rust, scale, dirt, excessive moisture, or other foreign matter in the air supply. New vanes When the start button on the control panel is can be easily and quickly installed by dis-depressed, the solenold valve is energized, allow- assembling the motor as described in subsequent Ing air from the tanks to pass through the paragraphs.

solenoid valve to the pinion gear end of the !vwer starting motor. The entry of air moves the pinion LUBRICATION gear forward to engage with the engine ring gear,'

Movement of the pinion gear uncovers a pori Bef re putting a new air motor into operation, allowing air pressure to be released to the upper pour about two teaspoonfuls of engine oil bito starting motor which, in turn, engages its pinion the air inlet so that it will be carried into the gear with the ring gear. Both pinion gears being snultivane motor with the live air. Before storage engaged, the air is released from the uncovered r lay up, the notor should be fully lubricated port in the upper motor. In addition to maintain- with a light oil containing a rust inhibitor, ing gear engagement, the air opens the air start valve, releasing the main startmg att supply, Air enters the air motor passages through the Startmg air passes through the air start valve and lubricator, which is in the air line just ahead of into the flexible hose assembly atta:hed to each the motor, An oil air mlst from the lubricator air starting motor. The multivane rnoton drive enters the air motor, providing lubrication. A the pinion gean, rotating the ring gear, and small portion of the air passing through the cranking the engine. lubricator entets the oil bowl of the lubricator through a ball check valve, creating a pressure.

Unless both pinion gears are engaged, the system The remaining air passes through a venturiin'the is designed so that the engine can not be started main air line, lowering its pressure at the venturi, with one motor. There is also a shutoff valve in The sight glass oil passage connects into the the system which is manually operated. When venturi passage, thereby providing a pressure maintenance is being performed, the shutoff valve differential, allowing oil in the bowl to be forced is closed to prevent inadvertent cranking of the up to the lubricator needle valve. The needle engine. valve controls oil drops entering the main air stream at the venturi, where it is mixed with air, AlR STARTING MOTOR forming an oil. air mist.

DESCRIPTION Tim needle valve should be adjusted (opened ne engine air starting motor, Fig.14 8, is a approximately one and one-half turns) to permit multivane type motor consisting of a rotor which three drops of oil per minute to be deposited in is supported at each end by ball bearings, a the air line when the air is moving. If the exhaust planetary gear train, and a Bendix drive. Air a:r shows excessive oil, adjust the needle valve to striking vanes, which slide in the rotor, causes the reduce the amount of oil supplied to the air.

rotor pinion to rotate and turn the Bendix drive through a set of planciary scan. The clutch drive Oil is added to the bowl through a filler at the pinion gear meshes with the engine ring gear and top of the bowl. For normal ambient temperature cranks the engine, of 60*-120' F., an SAE No.10 oil is recom-

__ __ mended! however, a heavier oil may be used if operating conditions indicate it necessary.

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1 AIR LINE LUBRICATOR .

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DESCRIPTION -

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_ .- ' .- ._. 1 The airlinclubricator, Fig.14-10, located between .; l ,  ;;.  !

the air start valve and the starting motor, emits ' -

an oil-alt mist into the starting system air to  ;

O provide lubrication for the starting motor. The r' -

main components of the lubricator are the oil bowl, needle valve, siphon tube, and venturi tube.  !.

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As air enters the lubricator, tite oil bowl is -

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pressurized by way of the reversible venturi tube. .- . 7"*' '-

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The alt flow creates a reduced pressure area as it 'D~

passes through the venturi section causing the oil , .

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in the bowl to go up the siphon tube into the -

chamber above the drip gland. At this point, the quantity of oil entering the air line is controlled s -

by a needle valve. As the oil enters the air line,it " ' ' '

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is diffused into a mist which is carried into the ~

air starting motor. A sight glass below the needle -

valve gives visualindication of the flow rate of oil '

into m e ak h e.

Fig.14 7 - Typical Dual Air Starting Systent MAINTENANCE

'Ihe oil level in the bowl should be checked at i intervals as specified in the Scheduled Mainte-o nance Program. In addition to checking oil level, the needle valve should be checked to ensure that the flow rate is three drops per minute. This can be checked visually through the sight glass in the p front of the lubricator. . .

If oil does not flow, remove top plug and drip gland. Clean parts and passages, using kerosene, and blow out with compressed air.

Iteplace any defective gaskets or packing. Re- -

assemble, tightening drip gland firmly, but care- y fully,

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Compounded oils containing graphites, soap, or 3333 fillers should not be used in the lubricator.

Fig.1410- Air Line Lubricator

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Ref. No.1 I PLATE B1079 DR 3 i

l Ref. Part Qty.

) No. Number Req. Descriptica '

To order items not identified bv a part number specify: Parts List Number, Page, Reference Number and complete description of the part.

LUBRICATOR ASSEMBLY . . Automatic Air Line 1 8322844 1 LUBRICATOR ASSEMBLY .. Automatic Air !!ne . Replaces 3387780 2 1 3

HEAD ASSEMBLY .. Lubricator I-1 BOWL . Lubricator 4 1 TUDE .. Siphon U

S 1 GASKET ., Lubricator head 6 2 BALL 7 1 SPmNG

,! 8 1 SEAT 9 1 GASKET .. Siphon tube 10 2 SCREW .. Head mounting 11 4 SCREW.. Head mounting 12 1 LABEL

'13 1 PLUG ., Used for shipping purposes only

• 14 8487232 I KIT.. Repair Head Asy. lubricator 1

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h C1079 DR 6

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