ML20062J249

Final Rept Re Significant Const Deficiency 10 Re Defective Emergency Generator Roller Pins.Roller Pin Diameter Redesigned to Provide Interference Fit at Assembly Between Pin & Crosshead & Reduce Clearance Between Pin & Collar

ML20062J249
Person / Time
Site:	Waterford
Issue date:	09/18/1980
From:	Crnich J, Hart J, Milhiser R LOUISIANA POWER & LIGHT CO.
To:
References
10CFR-050.55E, 10CFR-50.55E, NUDOCS 8009300338
Download: ML20062J249 (3)

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LOUISIANA POWER & LIGHT COMPA:,'Y WATERFOPbSESUNITNo.3 , 2 Final Report of Significant Construction Deficiency No. 10 Defective Emergency Diesel Generator Roller Pins Reviewed by ,

f__ 1I h J. nich - Site Maaager Date I Reviewed by _

M m_ l 93 R. J. Mfili er - Project Superintendent Date

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Reviewed by AR t/ 6'/A/ _

h't' l J J. Hart - P roj ee't Licensing Engideer fate /_

s Reviewed by l R. e lartnett - Q. A. Site Supervisor Date September 38, 1980 e

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J FINAL REPORT sit lFICANT CONSTRUCTION DEFICIENCY NO.10 DEFECTIVT EMERGENCY ' DIESEL GENERATOR ROLLER PIN INTRODUCTION

'This report is submitted pursuant to 10CFR50.55(e) ' (3) . It describes a ideficiency in the emergency diesel generators supplied by Cooper Energy l Services for Louisiana Power & Light Company's Waterford Steam Electric '

Station Unit No. 3 and others.

1 DESCRIPTION on Povember 3,1978, Cooper Energy Services pursuant to 10CFR21 notified the USNRC-Office of Inspection and Enforcement, Washington, D.C., of a defective roller pin in the crosshead subassembly of each power cylinder within a KSV Power Engine.

1 The extent of the deficiency is as follows: Each power cylinder has one inlet and one exhaust push rod assembly and two valve crosshead assemblies.

The valve crosshead assembly contains a crosshead, a roller pin, and a pin collar. During a recent performance test on this engine at another f acility, it was found that some subassemblies showed abnormal wear on the surface of the roller pin. No engine shutdown nor malfunction was experienced, but it is felt by the manufacturer that over a longer period of engine operation this abnormal wear could progress far enough to cause the engine to malfunc-tion. This defect is considered to be reportable and is described in Attach-ment A (Cooper Energy Service letter to NRC dated November 3, 1978).

l SAFETY IMPLICATIONS

, ( This deficiency, if left uncorrected, could possibly cause an engine malfunc-l tion. There would be no significant safety implication of engine malfunction during normal plant operation. However, this deficiency could invalidate some of the assumptions used in the safety analysis report. If a design basis acci-dent (e.g. , LOCA or main steam line break) were to occur coincidentally with a loss of offsite power, and the diesel-generators did not perform in accordance with specifications, then some essential equipment used to mitigate the conse -

quences of the postulated accident could be degraded.

CORRECTIVE ACTION The corrective action taken by Cooper Energy Service was to redesign the diameter of the roller pin to provide an interference fit at the assembly between the roller pin and the crosshead and reduce the clearance between the roller pin and the collar. In addition, the hand flaring operation.to seat the pin ends into chamfer on the crosshead has been replaced by a more consistent and posi-tive press operation.

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i Corrective action work on the emergency diesel generators was accomplished by Culf Engineering Company, Inc. , under the supervision of a Cooper-Bessemer representative.

Corrective repairs consisted of replacement of the inlet and exhaust valve

crosshead assemblies with those of the new design.

This work was completed during the week ending September 19, 1980, and is documented in Gulf Engi-neering Traveler Nos. PS-233 and P5-229.

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,t Attachment a - pg 1 of 2

,- <d COOPER-DESSEMER CDbP/:IJY

• L%.'iQ Ilove;::ber 3, 1978 ,

Of'fice of Inspection and Enforcement U. S. Ituclear Regulatory Commi.ssion Washington, D. C. 20555 -

ATTil: . Director of Inspection a'nd Enforcement

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Gentlemen:

I n .a c c o rd Fn c e wi t h 10C F.P. P a r t 21, this letter is notification of a deficiency found 9-13-78 within a l'SV Power ThisEngine enginesuppliedis and manufactured by Cooper Energy Services. .

part of the emergency standby diesel-generator set supplied for .

installation at (4) four licensees' stations. -

Each power cylinder The er. tent of the deficiency is as follows:

has (1) inlet and (1) exhaust push rod assembly and (2) valve This sub-assembly crosshead assemblies Part ?!o. Z25-1-2#10. a roller p'in Part contains; a crosshead Part flo. JS-25-lG, JS-25-II4. D.uring a lio. 'JS-25-l P, and a pin coll ar Part !!o. it was found t' hat some recent performance test on this engine, the surface of the roller sub-assemblies showed abnormal wear on pin l'o engine shutdown nor mal-function has been experie but it is felt abnormal wear could progress far enough to cause the, engine to mal-function.

is to redesign to increase The corrective action taken by C.E.S.(JS-25-lP) to provioe an inter- .

the diameter of the roller pinassembly between the roller ller pin and pinthe crosshea'd.

ference fit at and

,(JS-25-lG) and reduce the clearance between the roIn addition the hand fla 4

the collar to seat the.(Jpin S -ends 2 5 .lii) .into chamfer on thepress and positive crosshead operation. has been

.The replaced by a more consistent sub-assemblies in field unit;s named below are to be inspectedTh and replaced if required. be dependent upon avail-change out by C.E.S. on field units willbe done as soon as is practi-ability of units for rework but will cable.

The following engines which have had to field . running determine if camat the lice.nsees' rollers Cam sites are_to be inspected by C.E.S.have becore sluggish an or cam roller scu'ffing can be an .

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, or collar.

C0l!T I;;UE D F/

• fPl10 H f 412/452 8000

..,. , o MWachmong 46 pg cc@lr 24 .

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( ..mber 3,1978 liebraska Public Power, Cooper Station', SIDs 7102 & 7103.

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Commonwealth Edison, Zion 1 & 2, S11-7090, 7091, 7092, 7093

. & 7094. .

The following engines at the licensees' sites which have~not had field running are to have the inlet and exhaust valve cross-head assemblies replaced with those of the new design.

Pennsylvania -Power & Light', Susquehanna 1 & 2, S!!'s 7157, 7158, 7159 and 7160. .

L'ouisiana Power & Light, Waterford 3, SN's 7170 & 7171.

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B. B. Bender Vice President &. General Manager '

CB Reciprocating Products

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cc: Ebasco Services, Inc. .

Two Rect.or Street - '

flew York, fl.Y. 10006 .

ATTit: D. Sandiforth, Supervising Engr.

L. Spin' son, Site Quality Program Mgr.

P.O. Box 70 .

Killona, Louisiana 70065.

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