ML17223A199

Part 21 Rept Re Radiator Fan Shaft Bearing Failure at Plant. Problem Currently Under Investigation.Addl Info Will Be Provided When Available

ML17223A199
Person / Time
Site:	Saint Lucie
Issue date:	06/08/1989
From:	Kulchak R MORRISON-KNUDSEN CO., INC.
To:	Murley T Office of Nuclear Reactor Regulation
References
REF-PT21-89-096-000 PT21-89-096-000, PT21-89-96, NUDOCS 8906190084
Download: ML17223A199 (14)

Text

ACCELEP>TED DISlBUTION DEMONSTRIOY SYSTEM 0

REGULATORY INFORMATXON DISTRIBUTION SYSTEM (RIDS)

ACCESSION NBR:8906190084 DOC.DATE: 89/06/05 NOTARIZED: YES DOCKET FACIL:50-389 St. Lucie Plant, Unit 2, Florida Power

& Light Co.

05000389 AUTH.NAME AUTHOR AFFILIATION KULCHAK,R.D.

Morrison-Knudsen Co., Inc.

RECIP.NAME RECIPIENT AFFILIATION MURLEY,T.

Office of Nuclear Reactor Regulation, Director (Post 870411

SUBJECT:

Part 21 rept re radiator fan shaft bearing failure.

DISTRIBUTION CODE:

IE19D COPIES RECEIVED:LTR ENCL SIZE:

TITLE: Part 21 Rept (50 DKT)

NOTES:

RECXPIENT ID CODE/NAME PD2-2 LA NORRIS,J INTERNAL: AEOD/DOA IRM TECH ADV

. NRR CRUTCHFIELD NRR/DEST/ADE 8H NRR/DLPQ/PEB 10 NR~R+~~D RGN3 RGN5 EXTERNAL: INPO RECORD CTR NRC PDR COPXES LTTR ENCL 1

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1 RECIPIENT XD CODE/NAME PD2-2 PD AEOD/DSP/TPAB IRM/DCTS/DAB NRR VARGA,S NRR/DEST/ADS 7E NRR/DOEA/GCB 11 NUDOCS-ABSTRACT RES/DSIR/EIB RGN2 RGN4 LPDR NSIC SILVER,E COPIES LTTR ENCL 1

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I NOIE 'IO ALL "RXDS" RECXP~i PIZASE HELP US 'IO REDUCE KHAKI!

CONTACT 'IHE DXX2~ CONIRDL DESKS ROOM Pl-37 (EXT. 20079) K) EZiQGZATE YOUR NAME FROM DISTEGBUTIQN LXSTS FOR IXCOMENIS YOU DGNiT,NEZDf D

TOTAL NUMBER OF COPIES REQUIRED:

LTTR 26 ENCL 25

~ MORRISON KNUDSEN CORPORATION EXECUTIVEOFFICE MORRISON.KNUOSEN PlAZA PO. BOX 73 1BOISE. IDAHOU.S.A. 83707 PHONE: (208) 388 8000 8 June 1989 S/N 10CFR21-89-2 Ref.

10CFR21-0046 Mr. Thomas Murley Director - Office of Nuclear Reactor Regulation 11555 Rockwell Pike Rockwell, Maryland 20852

Subject:

Potential 10CFR21 Finding Radiator Fan Shaft Bearing Failure Standby Diesel-Generators

Dear Sir,

I have been advised by our Power Systems Division of a Potential 10CFR21 Finding regarding a radiator fan shaft bearing failure at the Florida Power 5 Light Company's St. Lucie P2 Nuclear Plant.

We are investigating the problem and will provide additional information as it becomes available.

Very truly yours, Il'TI~~

R.

D. Kulchak Director - guality Assurance RDK:ed32 cc:

F.

M. Adams H.

W. Falter V.

Mitchell M.

Sharpe File 8906190084 890@OR PDR ADOCK 0500O389 8

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REPORTING OF t OCFR PART 21 POTENTIAL DEFECTS AND NONCOMPLIANCE ATTACHMENT 4,2 10CFR PART 21 APPLICABILITY EVALUATION FORM P2o~iod Paar' ltf 4+

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June 7,

1989 PAGE>>-

3 OF 4 The standb/ diesel genL I atol s at the 8t Lucie 82 Nucleat Plant are radiator coaled

~

The fans that push air through the r adiatar ar e engine driven by a shaf t. drive including stieaves and belts.

The fan is mounted an a suppart that is part of the radiator. structure.

The fan is maunted an a

shaft suppar tad by twa bearings.

(Drawings 1.01/9 8heet,

~ af 7)

~

A slleave is mounted an the opposite end and is driven by belts off the engine drive line.

Gn June 5,

i969',,

I had a cal l fr om Nr. Phil Bar nes of the 8 t. Lucie 82 Nuclear Plant (407-468-4236).

He e>!plained that they last.

a bearincl an the radiator shaft.

The Florida Power and Light analysis concluded that the bear ing f~iled because the fit. an the shaft, was tao loose.

The component was designed and furnished by the 0 5 N Manufacturing Company of Hauston

> Te'>>as as part nf the radia tar assembly.

The radiatar fan shaft was ~" raund "tock>>

I discu sed this with Nr. Rich Rauner of the 6 5 N Manufacturing Company etio bel.ieved it was round stack (Tur"ned).

I fnund that 3" raund stock (Tl!rned ) lied a tolerance of +000/-004>>

The bearings used are Link-Belt Pillnw Black P/N PE-822448H.

l'he shaft taler anc e r equired for a 5" shaf t is +.000/-.00k.

To meet this tnler.ance,

~-.l/8" diameter round stack is required fnr machining ta the proper tolerance.

I have developed a

sketch of the replacement.

shaft 6002BK-1.

I discussed this fut ther with Phil Barnes in the late afternnan of June 6, 1989.

Florida Power and Light has taken carl"ective action and replaced the fan shaf t with one of the proper tolerance.

I tald Nr. Phil Barnea that by definitinn, this defect is reportable in accordance with iOCFR2i because the failure nf t'e radiator to cool cauld cause the diesel-generator ta fail ta per farm its safety function.

I asked if Flarida Power and Light would file the repnr t ~

He was waiting fnr my input. and felt that Florida Power and Light wnuld file.

I asked him ta cnnfir m this to me in writ.ing.

Ne have no other radiatol drives in this canstructian in Nuclear Plants.

The END some that are radiator cnaled, but their di.fferent.

Ta my knowledge, this defect St. Lucie Pl ar t.

ty pe 999 type units have design eisa is very limited ta the

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Attechments -

Drawing XOi79 Sketch 6002 SKI Link-Belt Cet pg 3.-100 Link-Belt "shaft flts 5 tu1 er'an dies" Letter ta CION Nanufacturinq Ca.

June 6 f989 9'd

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p. All units available with type E lip seals.

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+;:.Be'los P"822500FH pillowblocks have two spring locking collars (bearing dimensions,

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Addtttonal Features:

AH fixed type 822400 and 822500 f'I. imounted. units(except CS units) canbe purchased with farmed steel closed end caps an the collar.side which covers ail

. 'rotating elements. Two housing seals are 1

each replacement bearirig and should be closely toHowed, Replacement bearings are not prelubrinated but are coated with a mineral base preservative'and should be further protected from moisture and dirt, especlaHy during instaHatlan:,-

I bperatlon:

Series 822400 and 822500 mounted units aro nrai<<hrianferf with a aaad OUSHtv petroleum grease af No. 2 consistency which has been tested foroperational characteristics and stabHily for lang shelf Hfe. The service instructions packed with each unit provide guicleHnes for relubrlcatlon Intervals and recotnmended greases. The lubricant furnished ls generally Hmited to an operating temperature tangh of -20'F to +200'F

(-294 to 934C), The jip seal E should be Hmlted to a temperature less than 225'F (f07'C),

Where significant thrust loads are appHed to 822400 or 822500 mounted units.

thrust collars, specere, shaft shoulders etc. should be utilized ta support the thrust so that it ls not transmitted through the lacking collars and set screws.

, These units have a mlsaHgnment capabHity ot ~2'. They are factory adlusted with suffICIent clearance far operation within stated speed limits, Takeups:.

The mounting of 822400 and 822500 ylllvrtirlvvfwvs ~ ~islrvrvul L,I l la<<~up frames is Hiustrated on page I-'111. Small pHlow blocks canbe maunted on I.C frames, see page 1-27,':

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,pl, I provided to protect the bearing during

, mauntingarlnciseataccldentalcap

'emoval. Closed end units have a special ovtonrf~rf ihraarfR!f aavet tor mauntino the end oap. They ere designated with the

'uffix HHC or EEC {I.eiP-822431 HHC).

Shafting should nat ex'tend beyond the end of the bearing Inner ring mare than l/o"(3.2mm) when end caps are ta be

.Used.

I Series 122400 and 822500 mounted units have driiled or cored mountirtg boit holes suitable for the inch ar metric bolts listed, DrHlect holes willbe $f>"(0,8 mm) larger than the largest Inch ar metric bolt shown, Beatings and seals can be replaced in Series 822400 and 822500 mounled units

{except CS and CSE units). Service inetrucsone tor mounting are inclucfed with I

Fixed and Expansion Units:

Fixed and expansion type units ere

~

available in series B22400 and 822500 pillowblocks and flanged units. As these units are deslgnecf tar sHp titted shafts, collar mounted, twa tixed units can usual be applied ta a shaft. Expansion units at<

recommended for use on one end of longer shafts. where supports are not steel or where significant temperature differentials are expected between shaft.

and mounting Structures.

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Service instructions are provided with shipments ot bearings and are evaiiabh on request. These instructions provide deteHed information ta aici fn the praper installation, opera)ian, and maintenancl end should be carefully read and foHav Failure to do so may result in unsatis-factory service as well as serious persoi Injuryor property datnage.

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'O'N LM A>I38 NZSQfiN>l-NOSIBHOW 9T:9Z 68 88 HM'haft Fits and Tolerances:

Bearings should have proper fits on the shafts.to minimize fret wear. Shafting should be round, straight, tree of burrs and nicks, end of correct size. For the average appHcatlon with moderate loads and speeds the following shatt talerances are recommended:

Shaft Diameter Recommended Tolerance f/% 2M Nominal to -,0005" gja 2)(,. 5

'ominal ta-.00t0" 2$ mm-50 mm Nominal to -0.013 mm 55 mm. f25 mm Nominal to -0.025 mm

~ For more severe conditions, or where dynamic balance ia important, a light press tit may be requited. Consult FMC Corporation, Bearing Divisian.

'arning:

The correct selection of bearings or with aCfequate safety factors. Far this mounted units requires that the magnitude reason pillowblocks are best suited ta end nature ot eH loads, speeds, elignmenf, withs'land radial Iaade passing through mounting, operating requirements, and the bhse. When heavy loads ar shock maintenance b'e adequately considered.

loads are possible, it Is most Important to The selection of materials for and design mount a unit sa that the unit Is directly and of housings, shat ting, fasteners, seals, substantially supported other than through end accessories, as weH as provisions for its mounting baits. Where Ihe Hne ot force inetaHaHon and maintenance, must follow falls outside the base, such as with goad engineering principles.

horizontal or opHit loads on pillowblocks, serious housing and fastener deflection ar Housings must be selected and Installed taHute may occur. These conditions may with regard to the degree and direction of require designs using different materials, the forces Ihet willoccur. Housings should fasteners, mounting design, stop bars.

nat be used under tension loads except P

~ 87'd

MORRISON KNUDSFN COMPANY) INC POWCR STSTRLtS DIVISION POST OFFICE eox 192S ROCKY MOUNT.NORTH CAROI.INA27I02iI92S PHONEME (919) 977 2720 ITWX:(SIOI 9294725 FAX:tSI2) AI5443Q hlhldhkl~

June 6,

1989 Fog FgP oiI Mr. Rich Rouner 0

8 M Manufacturing Company Post Office Box 24098

Houston, TX 77229 REF - St.

Lucie 82 - Florida Power II Light Company Radiator Shaft (Dwg.

10179 8

10180)

Dear Mr. Rouner:

The radiator shaft bearings failed.

Florida power g Light Company analysis of the failure attributed the failure to loose bearing fit.

A crack developed under the locking collar in the set screw area.

I believed the 3" diameter shaft was cold rolled turned stock with a tolerance of +.000 to -.004.

If it was ground stock, the tolerance was

+.000 -.002.

The bearing PE-B22448 (3") requires a shaft tolerance of 3" +.000 to

-.001.

To get this a 3-1/8 round bar would have to be used then machined to 3.000+000/-.001 diameter.

I note that the 27/5N dimension on drawings 10179 and 10180 should be 26I/5N to the center line of the fan.

The 12N end dimension should be 13".

Since FPSL plans to order replacement

shafts, we require verification of our findings or corrections you determine are correct.

Attached is a sketch of the shaft as we see it.

Thanks for your cooperation.

Yery truly yours, Harry R. Falter Principal Engineer Attachment cc:

Gene Schoeck Don Galeazzi

'O'N JM AN38 W3SGAM>l-WOSIHHON ST:9T 68'8 HAS

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