ML20136C038

Site Problem Rept 174 Re Zero Ground Condition Discovered in 2A Reactor Coolant Pump Motor Between Upper & Lower Bearing Housings & Motor Casing.Caused by Positioning of Burns & Roe Oil Spill Retainer Housing

ML20136C038
Person / Time
Site:	Three Mile Island
Issue date:	07/12/1978
From:	Pletke L, Rise D, Rogers L BABCOCK & WILCOX CO.
To:
References
TASK-TF, TASK-TMR 174, PROB-780712, NUDOCS 7909140275
Download: ML20136C038 (10)

Text

[- BWNP-20345 (6-78)

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,, SITE PROBLEM REPORT TPANSMITTAL

• • • • CLEARED **** ,

To: Change Control For Distribution File: 13- A. - / 7 [

'S. H. Klein - Quality Assurance Contract No. : 620 0 4 Central Engineering Files SPR: 17Y ;@-o O d.b.hes>psey - Tank Engineer (s) 'Titic: 2 r? M C[ Nb Toft L ./.)l 4k - Project Manager (q/CUWO [rfc4 CdWS Datoi 7,/2.0b8 Status Code: C L. C. Rogers - MET. ED. / P. E. Pe rronc

/ F. R. Faist - TOLEDO -

1. J. R. Bohart - Incl. Support

/

B. A. Karrasch - Plant Integration Attached is one copy of Site Probico Report No._ /7! which was processed on Contract 620-00 /)6 .

Future contracts have been reviewed for the potential of a similar probica. This problem rd/is not considered applicabic to other contracts REMARRS:

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NUCLEAR SERVICE SUPPORT ENGINEER 4

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) A111c-Chalmern PROBLEH CCuTACI

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I E STATUS-ACTION 10 DATE, INCLUDittG PER50Hs CONTACTED: j i

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F U R Til E R ACTION RECOHitENDED EY SITE PERS0hMEL-SEE ATTACPS.D RESOLUTION:

ALLib LH A LmCRS 70 coizcELT /**?cottm nucca i*. A . E b ~) (, *; */ o l, .~o t).

P. O. # o S 2. 7 6 2 L U.

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PRE AAED Sy DATE APPROVED BY DATE 5 (.tw_ ' h A - /7-? 9

$ .l. /n /l /L./ .2 - 7 .

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COST CATECORY FIELD CHANGE REQ F.C.A. NO.

SI GM i f. DE F I CI'.EC Y NO e Ox0cn OTacR O YEs Ou- oyes 0 tz.

Sl ![ C o nrLE l ic.8 KENE T: Allis-Chalmers representative DEVIA!! CSS:

recommended replacement of insulating material. The O NONE SPR REV h3. O Customer, based on his experience with similar pumF DATECCHPLEIED: \ ',j' ;[ g ,

3 in Unit I,h.- '-H ! 1.;;t t3 v r '. ! " . . . . _ _ . _ _ ,

EdLLt.tritt1. Tne CUULoC.?r Can stil.L CnCcK the uppCT 'b=L**"W_. s y" b. earinc for grounds by physically icolati*nc the 7 1 ,, p r c [f[ (Aw ] p ge /

t, lower bearing by other means. QdbO- ;.Q. ,

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>p Dr.SCRIPTIO:: OF PROBLE't While performing the_ normal ground checks on 2A RCP motor, a " sero ground" (zero ohna resist.ance) condition was found between both the upper and lover bearing housings and the rotor casing. Inventication of the problem identified the following three items as causes:

Item 1 - The oil spill retainer housing designed by Burns & Roe van solidly resting against the support plate that houses the high pressure oil lif t motors on the upper bearing housing.

Item 2 - 111salignment of and/or foreign material within the material insulating the lower bearing housing from the motor casing.

Item 3 - No insulating material between the flances of the water lines to the lower bearing oil cooler and no insulating =aterial between the water lines and supports holding the water lines to the motor casing (this item is applicable to all four RCP ,

motors at TMI-2).

o STATUS Items 1 and 3 are customer problons. ' Item 1 is being corrected at this time,and the status of Item 3 is unknown. The present conditien of Item 2 has been explained to the Customer by the Allis-Chalmers represent-ntive. Since a resistance reading of 15000 ohms was obtained between the upper bearing housing and-the motor casing, operation of the motor with a grounded lower bearing housing would not be detrimental. ,

Persons contacted - Ron Toole (CPU), Leo Giovanangelo (Allis-Chalmers)

.~ . -.-. .._ - - . .. - . - -

FURTHER ACTION RECO:Z:DED BY SITE PE?.SO ::iEL - ..

Have Allis-Chalmers or !!PGD prepare a proce.iure for removal and installation of the lower bec. ring insulation with the motor shaft in place (the Allis .

Chalmers f actory said that this could be done; operating space vill be

. - . critical so this should be verified using our own information ). Also have Allic-Chalmers or NPGD prepare a list of materials necessary for correction of the problem and have the Customer order the sene and have on hand so that a repair can be made at the earliest possible date. -

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A DADCOCK & UILC0X v l NPGD  :

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4RCCURggENT AUTHORIZATION (PA)

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620-0006

,l M .'Ornn. t - Sui',' L I E P. MIE 2-13-78

" ne nsny. Punos & Drives Allis Chalacrs I p uf.diftE oA.nA 80.

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, Cen t ral Poue r I, T it ht - Tift - 2 gy AII ACra:tnis RECEIVED RCLEASE FOR SillP.

-(OffST FOR BIO FEB 141978 u unca Or ea En O C m Cc Onn R .

n[ ASE TCR IWG'<G CMOLO Rc1coso Adm. inis

. trat.ion Provide

]L. FOR HAl'L PT.0C boil!ER (LEASI TOP. MFG. Vcn_ dor Service _ {-] Q!. APPr.MED SUr1LI CP. I'.0T REQU l F.E D

[$ 10C F R21 APPLY? C(ES C l;0 if YES, IDENilf f APPLIC ABLE ITEMS 51 E U C 110 $.

Picase arrance for an Allis Chalacrs Service Representative to go to the T (I - 2 site and assist in correction of the probica with inef fcetive insulation of the Lover bearing housing of the 2A reactor coolant pu .p notor. It is anticipated that correction will require replacement of the insulating material. Mr. Lcc Rogers of the T.NI - 2 site will contact A-C to arrange the time for this work. .

>1cose arrange for the service representative to have the natcrial necessary to replace the louer bearing insulation. These caterials are identified through AC Drawing lio. 05-507-989-404 and Assettbly Release 04-120-396-505 by the following sarc nunbers: .

Etem 11 Pt. No. 05-682-799-001

[ tem 52 Pt. No. 05-682-798-505 .

[ tem 54 Pt. No. 05-682-812-002 Ltem 55 Pt. No. 78-781-002-011 00-475-385-711

~~.---- -, - . _m ax W' - U' ' "3' dC06-S2-.05 Project ffanagement: PREP CD SY j I . o c. i m i~o~ , n o <

L. R. Pictke Pumps & Drives:

ff <ryg / p. 6 42-33-002 J. D. Demnecy

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PROJ[c1 Con 1FOL C. C. Phinket t A /( f - ( j i . .l.J, QUAll1T AS$ ERA::CE S. II. Klein E'UIdII'EIC Ui'Eifi!. CL

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rw e no. 2 V W 4

....u m 4, 25 and contacted L. Rogers and Jid Corbin of B&W and h,p rted to of

, Haw;dns cite Oct.

GPU. .

p.a ppose of trip was_ as follows:

, gnit IA, S/M Q887 Q Customer reports noise coming from around the lower ,

yearing arca- '

unit 28, S/M 38828.

a. Investigate oil leak coming from RTD conduit assy. as per 05 416-733-403

b. Investigare renconc for grounds at upper bearing insulated bearing acay.

The investigation on Unit PB was to locate the problem areas which also were common to the other three units. ..

T/N 38829. Unit lA. Customer reported the following observations and from I hu records. J '

1. Thisthis during motor period ran inthat excess they were of 500awarehrs. and of. customer did not have noise

2. They changed the pump mechanical ceal that failed repeatedly because of thermal chock.

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3. After ceal change on pump they noticed noise at motor pump. Reportedly 1 had vibration level of_7 mill., i

4. They ran motor uncoupled and noice disappeared.bq p ,

5. Noise witnecced by A111c-Chalmero service representative.

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When I arrived the coupling and hold down bolts had been removed and all mechanical and electrical connections had been removed. The motor wan in the process of being removed because customer is experiencing flexitallic gasket problems with the pump and not for any motor problems.

could not check alignment. I was shot;n data by Tom Hawkins thatIshowed there fore motor vibrations to be low and bearing temperature to be normal.

I looked motor over carefully and noted labrynth seal clearances to bc as followc:

.012 .

.008 + .014 ,

.011 ,.

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3hecked air gap and found it OK. '

Dropped lower bearing housing accembly and believe I located s the p,roblem -

in the water cooler coils to the Lo_wer b e tigg, By strickin,0 the coil header the coil fins hit againct each other and made a metallic cound. The j luo, brackets that encased the four coils were free to move both vertically and horizontally and added to the noise. I took some plastic strips and I weaved them in between the coil at the center of the circumference relative ,

co the header and secured this with nylon tie wraps. I installed come i alactic Vas generated.

at the two brackets. Now when I tried to vibrate the coils no noise , l l

fill be eventually The ene accuracy rgiced . :_.-- of my judgment will be proven when the motor Cotor1 Ch 3n dg% i - --

ak at HTb J unction box wac verified by my obwervatj ons. Refer to '

4 3 M, 0 3 oWer junction boxes. I found oil in conduit Item 3 and in both the upper and the problem to be oilhad Oil gotten pass'M the conduit ceal Item 5. I

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right on through the a y at the seal box. Oil followed

',hese 3pagettispaget to the junction box. I cut away the varnish impregnated r

?)g. pa lap 6 1ass. cloth and exposed the ends of the 5 spagetti's^. I v' '

harefully sealed around each of the six wires that went into the spagetti with silicone rubber and continued this to include all of the 5 spagetti(

and ended at the conduit with a good mass of silicone rubber to seal oil from getting into the conduit. I had this wrapped with glass tape and varnished. This should take care of this problem. .

I removed the ground strap at the lower insulated bearing and read sero chms. Drained oil from lower bearing and found neoprene seal at the f-f insulated pipe coupling had been removed. Removed Burns and Roe drip 511p sheet metal (drawing attached). Removed mechanism ground from Hi left DC and AC motors. Cleaned mechanical interference between Burns & Roe sheet metal and motor components. Got 7500 ohms. Cleaned insulated bolts and increased this to 1 500 ohms. Motor bearing insulation very crudy and I believe by cleanin they will increase the bearing insulation aesistance.

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The 10 hp DC and C nigh lift motors are connected directly to the bearing isolation mount and when they ground the motors as is required by the

electrical code they ground the bearing. I made up some insulation for the hold down bolts and added insulation under the motor. This will , ,

eliminate grounding the upper bearing insulation. . .

I spent some time explaining to personnel how the upper bearing is insulated and where the insulation is located to iso] ate the bearing. This

situation of grounding the upper bearing grew over a period of time because the trades probably were not aware of the care that must be adhered to to insure upper bearir.g insulation integrely. .

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' Customer believes they can handle the other 3 motors in removing the -

grounds from upper bearings. '

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Leo Giovanangelo .

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.. i to Bill Corbin o f B&W 10/13/77, to investigage noise in lower , I

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,k ,e[o f mo t o r S/11 38 82 9 , type AVG, 9000 hp, 1185 rpm, 6600 volts. ,

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,, rt on noise while running a f ter 500 hrs. operation loaded test , 4

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  ;oise started after 350 hrs. quiet operation. Its an audible noise car lower bearing housinr; of unknown orici@. After customer uncouples s' 1

,r.J runs to see if noise is related to load the motor will be moved to floor location on blocks for complete inspection.*

Customer has a total of 4 units on job, S.'s 38827, 28, 29, 30. Aside from noise problem he has other problems.l The other 3 run quiet and

l normal under load of same duration test run. -

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But he has many grounds on insulated upper bearing housing of all '4 units. t r*

lie has oil leaks, etc. which means all 4 units hav.e to be l'eak tested, l checked and cleaned, remove drip lip (field installed by customer), check i oil leaks into electric junction box, upper bearing housing, check insulation, hoses, etc. I

• Site was unable to do this work at that time. Mr. Fauson was released I and would be recalled when site ready to procej6. ,

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...ej to Bill Corbin of B&W 10/13/77, to investigage noise in lower y.I,[.[,h of motor S/N 38829, type AVG, 9000 hp, 1185 rpm, 6600 volts. ,

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~ eld report ca n noise while running af ter 500 hrs. operation loaded te' oise started after 350 hrs. quiet ooeration. Its an audible noise *

"c,h Ibwer bearing housinr; of unknown orig'i($3 After customer uncouples *

.d runs to see if noise is related to load the motor will be moved to ficor location on blocks for complete inspecti on.

• Customer has a total o f 11 units on job, S 's 38827, 28, 29, 30. Aside from noise problem he nas other problems.l The other 3 run quiet and .

mormal under load of name c ration test run. .

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@ut he has many grounds on insulnted upper bearing housing of all '4 units. r Die has oil leaks , et c . which means all 4 units hav.e to be 1cak tested,

• Shecked and c'enned, remove drip lip (field installed by customer), check gil leaks into electric junction box, upper bearing housing, check '

Sn s ul a t,i on , hoses, etc. ,

1. . Site was unabic to do this work at that time. Mr. Fauson was released

$nd would be recalled when site ready to proceg$. ,

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, SITE PROBLEM REPO;f mu=x.:::secounc:n- mmera anim=w._w- .. _ n:.in2::nen.nn.mwommmerse.m .u ux:=;

SPR N0.

D00.10. COHl.NO.

C u s iottl R ORIG lHAIOW / QAIL R E v . h 0.

620-0006 174 0 Jercey Central L. Ro( $27/78 13 P.A. NO. PARI NO./1ASK NO. GROUP NO. SQ. NO.

yLHDOR O A111e-Coa 1 mere PROBLEM CONTACT 2

h /t d 33 e 2-illLE (HAX 30 CHARACTERS) pn 99 umtor nr~mc1 Prob 1 <en G . R . Vce t z /

DESCRIPil0N OF PROBLEM:

SEE ATTACHED x

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5 E STATUS-ACil0N TO DATE, INCLUDidG PERSONS CONTACTEO:

E SEE ATTACHED FURTHER ACTION REC 0Hl1 ENDED BY SITE PERSONHEt:

Q SEE ATTACHED I

RES0EUil0N: )

ll L L i b C ilR L M E '2 5 *r 0 co nee e ~r rec os tm unorm /*. tl , s h ~) f 2. y o L o y P. O.

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L DATE APPROVED BY DATE

- PRF ARED By B jn y } $ A ,i ?- 29 5 ,f, f. //.

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. COST CATEGORY FIELD CHAhGE REQ F.C.A. NO.

SIGNIF. DEFICIENCY ONORM OTHER O OVES No G 09- /.//i1 O YES "0 M SITE COMPLIll0N RLPORT: DEvlAll0NS:

N O Allis-Chalmers representative recommended . . _ . .

z replacement of insulating material. The .

DATE COMPLETED: ',/- // - 7[

Customer, based on hin experience with Gimilar p DATE w[ pumps in Unit I, has decided not to replace COMPLETEDB)

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o the insulation material. The Customer enn ntill check the upper bearinc for crounJ by

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! physically icolating the lower bearing by

! other meana.

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s s DESCRIPTIOli OF PROBLEM While performing the normal ground checks on 2A RCP motor, a "cero ground" (zero ohma recictance) condition was found between both the upper and lower bearing housings and the motor encing. Investigation of the problem identified the following three items as caucea:

Item 1 - The oil spill retainer houcing decigned by Burna & Roe wac solidly resting againct the support plate that houcec the high precoure oil lift motors on the upper bearing housing.

Item 2 - 141calignment of and/or foreign material within the material insulating the lower bearing houcing from the motor casing.

Item 3 - No inculating material between the flangen of the water lines I

to the lower bearing oil cooler and no inculating material between the water linec and supporto holding the water lines  !

to the motor cacing (this item in applicable to all four RCP motoro at TMI-2). l l

STATUS Items 1 and 3 are Cuctemer problemc. Item 1 is being corrected at this time,and the statue of ltem 3 in unknown. The present condition of Item 2 has been explained to the Customer by the Allis-Chalmero represent- I ative. Since a resistance reading of 15000 chan wac obtained between  ;

the upper bearing houcing and the motor casing, operation of the motor '

with a grounded lower bearing housing would not be detrimental.

Persono contacted - Ron Toole (GPU), Leo Giovanangelo ( Allic-Chalmero) ]

l FURTHER ACTION RECOI:ME"DED BY SITE PERSONNEL Have Allio-Chalmers or NPGD prepare a procedure for removal and inctallation of the lower bearing insulation with the motor chaft in place (the Allic-Chalmers factory said that this could be done; operating crace vill be critical co thic should be verified using our own information ). Also have Allic-Chalmers or HPGD prepare a list of nnterials nececonry for l correction of the problem and have the Cuctamer order the came and have l

! on hand co that a repair can be made at the earlient poccible date.

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BABC0CK & WILCOX .

NPGD sHEtT OF PROCUREMENT- - - - -

AUTHORIZATION (PA) -

620-0006 83 762406- 0 1

' .t . r. Walton. Purehnrin,. LUPPLilk bhil Tv: 2-13-78 J. D. Dempsey. Purnns & Drives Allis Chalners 'UL M Ohpih h0.

7510Hlk & PLAdl la l li 032568 LU l Jrrsev Central Po.ter & 1.inht - Titt -?

AllAlhHtNIS RECEIVED  !

UNC11Cl; i Dat'EAsEFORsnie.

]REQUESTFORBID FEB 141978

]PL AC[HEET Of Of.t ER OC:it.ucEOo0ER

]kf LIL5f. IOR IWGkG CMOLD Relcoso Adininistration Provido

]REL. F OP. H Al'l Pt0C.@0Tl;ER

]R[tt A5; f 0R Mf G. Veqh r Serv .b O QA APPT.)vED SUPPLIEC I;0T REQUlf.E0 If YES, IDENilfY APPLICABLE ITEMS 00tS 10tfk21 APPLY 7 Cf ES C HO insitutiloHS P1 case arrangc for an Allin Chalners Service Representative to go to the TMI - 2 site and assist in correction of the problem with ineffectiveItinsulation is anticipated that of the lower bearing housing of the 2A reactor coolant pump motor.

correction will require replacement of the insulating material. Mr. Lee Rogers of the TMI - 2 site will contact A-C to arrange the time for this work.

Please arrange for the service representative to have the material necessary to replace the louer bearine, insulation. These materials are identified through AC Drawing No. 05-507-989-404 and Asscably nelease 04-120-396-505 by the following part numbers:

Item 11 Pt. No. 05-682-799-001 t Item 52 Pt. No. 05-682-798-505 .

l

'l Item 54 Pt. No. 05-682-812--002 .

Item 55 Pt. No. 78-781-002-011 00-475-3SS-711 1

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,059-2006-S2-05 Distgitution List P R E t t. to by l Project Management: /g . i

f. 'GlWplp>.* gf Ilin ho,*sa, ce san enour ua P P1cthe 42-33-002 I"*P8 b NIVCU REglWl6 h ghY I

3. D. Dempsey .. // W E l3,'

J. E. Thornhill <> 0 *tt'."*- - d

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