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 COPXES RECIPIENT COPIES ID CODE/NAME LTTR ENCL XD CODE/NAME LTTR ENCL PD2-2 LA 1 0 PD2-2 PD 1 1 NORRIS,J 1 .1 INTERNAL: AEOD/DOA 1 1 AEOD/DSP/TPAB 1 1 IRM TECH ADV 1 1 IRM/DCTS/DAB 1 1

. NRR CRUTCHFIELD 1 1 NRR VARGA,S 1 1 NRR/DEST/ADE 8H 1 1 NRR/DEST/ADS 7E 1 1 NRR/DLPQ/PEB 10 1 1 NRR/DOEA/GCB 11 1 1 NR~R+~~D 1 1

1 1

NUDOCS-ABSTRACT RES/DSIR/EIB 1

1 1

1 1 1 RGN2 1 1 RGN3 1 1 RGN4 1 1 RGN5 1 1 EXTERNAL: INPO RECORD CTR 1 1 LPDR 1 1 NRC PDR 1 1 NSIC SILVER,E 1 1 R

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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 TOTAL NUMBER OF COPIES REQUIRED: LTTR 26 ENCL 25

~ MORRISON KNUDSEN CORPORATION EXECUTIVE OFFICE MORRISON.KNUOSEN PlAZA PO. BOX 73 1 BOISE. IDAHO U.S.A. 83707 PHONE: (208) 388 8000 Ref.

8 June 1989 S/N 10CFR21-89-2 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

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QRT NG. > iOCFR21-00<S Df 1"E: idun@ "l 4989 PASEf t OF 4 10CFR2i REPORTINS OF DEFECTS AMD NON CONPLIANCE COMPONENT RADIATOR, FAN SHAFT BEARING FAILURE LOCATION FLORIDA POWER 5 LIGHT CONPRNY ST. LUCIE 42 NUCLEAR PLANT STANDBY DIESE} -GENERATORS

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PAGE>>-~ 3 OF 4 The standb/ diesel genL atol s at the 8t Lucie 82 Nucleat I

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 f r 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 r adia 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 ty pe canstructian in Nuclear Plants. The END 999 type units have some that are radiator cnaled, but their design eisa is very di.f ferent. Ta my knowledge, this defect limited ta the St. Lucie Pl ar t.

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p. All units available with E lip seals. Addisonal tnrormatlon, pago l-121,

"'.". f Tolerance, +.005'+0.5type 3 rnm).

r',.:.F pension unit allows axial movement ot Ml. (4.8 mmJ In either direction from cantered

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1 Addtttonal Features: each replacement bearirig and should be so that it ls not transmitted through the closely toHowed, Replacement bearings lacking collars and set screws.

AH fixed type 822400 and 822500 are not prelubrinated but are coated with f'I. imounted. units(except CS units) canbe a mineral base preservative'and should ,

These units have a mlsaHgnment purchased with farmed steel closed end be further protected from moisture and capabHity ot ~2'. They are factory caps an the collar. side which covers ail dirt, especlaHy during instaHatlan:,- adlusted with suffICIent clearance far

', . 'rotating elements. Two housing seals are I operation within stated speed limits,

,.~.<ii:, provided to protect the bearing during bperatlon:

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'emoval. Closed end units have a special Takeups:.

Series 822400 and 822500 mounted units ovtonrf~rf ihraarfR!f aavet tor mauntino aro nrai<<hrianferf with a aaad OUSHtv The mounting of 822400 and 822500

' the end oap. They ere designated with the ylllvrtirlvvfwvs ~islrvrvul L,I l la<<~up

if 'I petroleum grease af No. 2 consistency ~

' I HHC or EEC {I.ei P-822431 HHC). 'uffix which has been tested for operational frames is Hiustrated on page I-'111. Small Ir, ~,l > ~

Shafting should nat ex'tend beyond the characteristics and stabHily for lang shelf pHlow blocks canbe maunted on I.C II ~. end of the bearing Inner ring mare than Hfe. The service instructions packed with frames, see page 1-27,':

l/o" (3.2mm) when end caps are ta be each unit provide guicleHnes for I

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.Used. relubrlcatlon Intervals and recotnmended Fixed and Expansion Units:

) tl'I greases. The lubricant furnished ls

,pl, s I Series 122400 and 822500 mounted units generally Hmited to an operating Fixed and expansion type units ere ~

have driiled or cored mountirtg boit holes available in series B22400 and 822500 j s

~ .I l suitable for the inch ar metric bolts listed, temperature tangh of -20'F to +200'F pillow blocks and flanged units. As these r ~ DrHlect holes will be $ f>" (0,8 mm) larger

(-294 to 934C), The jip seal E should be units are deslgnecf tar sH p titted shafts, I,

than the largest Inch ar metric bolt shown, Hmlted to a temperature less than 225'F collar mounted, twa tixed units can usual lr (f07'C),

I be applied ta a shaft. Expansion units at<

Beatings and seals can be replaced in recommended for use on one end of Series 822400 and 822500 mounled units Where significant thrust loads are appHed longer shafts. where supports are not

{except CS and CSE units). Service to 822400 or 822500 mounted units.

steel or where significant temperature inetrucsone tor mounting are inclucfed with thrust collars, specere, shaft shoulders I ~

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I etc. should be utilized ta support the thrust differentials are expected between shaft.

and mounting Structures.

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. f 25 mm . Nominal to -0.025 mm

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l mounted units requires that the magnitude reason pillow blocks are best suited ta When these conditions are unavoidable end nature ot eH loads, speeds, elignmenf, withs'land radial Iaade passing through FMC Corporation, Bearing Division sho mounting, operating requirements, and the bhse. When heavy loads ar shock be consulted.

maintenance b'e adequately considered. loads are possible, it Is most Important to mount a unit sa that the unit Is directly and Service instructions are provided with The selection of materials for and design are evaiiabh of housings, shat ting, fasteners, seals, substantially supported other than through shipments ot bearings and l~t 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 pillow blocks, on request. These instructions provide deteHed information ta aici fn the praper installation, opera)ian, and maintenancl I I, ~

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serious housing and fastener deflection ar end should be carefully read and foHav

~I, Housings must be selected and Installed Failure to do so may result in unsatis-with regard to the degree and direction of taHute may occur. These conditions may factory service as well as serious persoi the forces Ihet will occur. Housings should require designs using different materials, Injury or property datnage.

nat be used under tension loads except fasteners, mounting design, stop bars.

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MORRISON KNUDSFN COMPANY) INC POWCR STSTRLtS DIVISION hlhldhkl ~

POST OFFICE eox 192S ROCKY MOUNT. NORTH CAROI.INA27I02iI92S I

PHONEME (919) 977 2720 TWX: (SIOI 9294725 FAX: tSI2) AI5443Q 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 collar in the set fit.screwcrack A

area.

developed under the locking 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

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