ML20033C669

Forwards Guidelines for Demonstration of Deep Draft Pump Operability for Response within 30 Days as Suppl to FSAR Section 3.9.3.Long-term Operability Is Being Reviewed Per IE Bulletin 79-15

ML20033C669
Person / Time
Site:	Wolf Creek
Issue date:	11/17/1981
From:	Tedesco R Office of Nuclear Reactor Regulation
To:	Koester G KANSAS GAS & ELECTRIC CO.
References
IEB-79-15, NUDOCS 8112030623
Download: ML20033C669 (18)

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- NOV 171981 DEisenhut NRC/PDR BJYoungblood L/PDR RLTedesco NSIC Docket No.: STH 50-482 MRushbrook 3 TIC GEdison ACRS(16)

JHopkins p

Mr. Glenn L. Koester RVollmer 4

Vice President - Huclear V

TMurley

Kansas Gas and Electric Corpany RMattson 8

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4 201 North Market Street bL V.

RHartfield, MPA Wichita, Kansas 67201-OELD 2

NOV2 01981> -i OIE(3) r

Dear Mr. Koester:

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Subject:

Long Tem Operability of Deep Draft Pumps a

IE Pulletin 79-15, dated July 11, 1979, was issued to all licensees and holders of construction permits as e result of deep draft pump deficiencies that were identified at facilities both operating and under construction.

For pending-OL applications, long tem operability of deep draft pumps is now being reviewed by the staff during the nomal licensing review process.

In order to facilitate this review, enclosed is a document entitled,

" Guidelines for Demonstration of Operability of Deep Draft Pumps". Within 30 days from the issuance date of this letter, you should provide a schedule indicating when a response, in the fom of a supplement to FSAR Section 3.9.3, would be provideri that discusses your assurance program for denonstrating long tem operability of your deep draft punps and the extent to which it confoms to the various portions of these Guidelines. Emphasis should be.

placed on (1) the establishment of installation procedures that are followed each time these pumps'are disassembled and reinstalled, and (2) the testing requirenents and bearing wear criteria. The instrumentation called for-in the Guidelines should not be considered a requirement.

These Guidelines establish an acceptable nethod of assuring long tem operability of deep draft pumps. They do not necessarily constitute the only method for demonstrating long tem operability. The staff will review the infornation you submit to detemine whether your long term operability assurance progran for deep draft pumps is in sufficient confomance with these Guidelines to assure long tem operability.

If not, the staff will detemine whether you have established and utilized other methods and procedures, preferably with the assistance of the pump manufacturer, that also denonstrate and assure that these punps will perfom their intended functions 'for the length of tine required.

l-I 8112030623 8 omce)

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wnc ronu ais oo. col ancu o24o OFFICIAL RECORD COPY.

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-If you have any. questions regarding this matter, please contact Dr. G. E. Edison, the Licensing Project Manager for your facility.

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The application / reporting requirements contained in this letter have been 3150-0011.

approved by the Office of Management and Budget; OMB Approval No.

Sincerely, Original signed by Robert. L Tedesco -

Robert L. Tedesco, Assistant Director for Licensing Division of Licensing.

Office of Huclear Reactor Regulation

Enclosure:

' Guidelines for Demonstration of Operability of Deep Draft Pumps cc w/ enclosure:

See next page d4 f.'

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. b*.deauuaposopacuom OFFICIAL RECORD COPY U$GPO.19814960

.Mr. Glenn L. Koester

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Vice President - Nuclear Kansas Gas and Electric Company 201 North Market Street

. Post Office Box 208 Wichita, Kansas 67201 cc: Mr. Nicholas A. Petrick Ms. Wanda Christy Executive Director, SNUPPS 515 N. 1st Street 5 Choke Cherry Road Burlington, Kansas 66839 Rockville, Maryland 20750 Eric A. Eisen, Esq.

Mr. Jay Silberg, Esquire Birch, Horton, Bittner & Moore Shaw, Pittman, Potts & Trowbridge 1140 Connecticut Avenue, N. W.

1800 M Street, N. W.

Washington, D. C.

20036 Washington, D. C.

20036 Kansans-for Sensi~ ole Energy Mr. Donald T. McPhee Post Office Box 3192 Vice President - Production Wichita, Kansas 67201 Kansac City Power and Light Company 1330 Baltimore Avenue Post Office Box 679 Kansas City, Missouri 64141 Ms. Mary Ellen Salva Route 1, Box 56 Burlington, Kansas 66839 A. Scott Cauger, Esq.

Assistant General Counsel Public Service Commission P. O. Box 360 Jefferson City, Missouri 65102 Mr. Tom Vandel Resident Inspector / Wolf Creek NPS c/o U.S.N.R.C.

Post Office Box 311 Burlington, Kansas 66839-Mr. Michael C. Kenner Wolf Creek Project Director State Corporation Commission State-of Kansas Fourth Floor, State Office Bldg.

Topeka, Kansas 66612 O

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ENCLOSURE GUIDELINES FOR DEMONSTRATION OF OPERABILITY OF DEEP DRAFT PUMP 3

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1.E.Bulletin 79-15 dated July 1979,tdentified problems associated 3

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with' deep-draf t pumps found at operating facilities and near term.

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operating licensee facilities., Deep draf t pe=ps,whi.ch _are _also,,,

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tre, :.c : :2, called " vertical turbine p. umps! are usually 30 to.6.0_ feet,1.n_1;ength'

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with impe11ers located in casing bewis at the lowest el.eva. tion of

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the pu=p.

The motor (driver) is located at the highest pump-

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elevation with the discharge no,zzle just below the moto.r,__,

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Bulletin 79-15:was initiated-beca'use seV~e'r l'~ nuclear hower' plait t

facilities could not demonstrate ~ eperability of their pumps. The' pumps were experiencing excessive vibration and' bearing. wear. The'~

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rapid bearing wear suggested that these pu=ps could not perform their required functions during or following an accident. As a 4

result of the staff's initt1 review of the responses to IE3 79-15,.

several plants were identif'ted as having potential prcblems with their deep draft pumps. These guidelines are provided for these '

plants so that the licensee or applicant involved may have a method acceptable to the staff,for demonstrating the operability of deep _

draft pumps.

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.s DEEP' DRAFT PUMP OPERATING CHARACTERISTICS Ins ord.er$ o better. understand the.' operating characteristic.s of.

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th~ese pumps,.a rotor @namics analyses was performed to ascertain

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the response of the pump rotor under ste.a$. state operation.

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The analyses. considered journal' bearin.,g to.;shaf t @namic response

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the. a.n.al.ys.is. depicted 7. typical deep draf t pump utilized by the m.

5 nuclear industry. The analysis resulted in rec,orw.ndations fer

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i 16proWng' th'e' stability'6f"thV pump f6 tor from externally-applied b: ---

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evaluations of North Anna, Beaver Valley and Surry facilit.ies with similar pumps include:

1.) Pumps with this type of. configuration ~are " prone Eo bearing J

whirl vibration problems due to the flexibility of the rotor and casing structure. This phenomenon is accentuated ts journal bearing clearance becomes large. This p'henotanon V

leads to bearing wear (Journal bearings).

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I " Low Head Safety Injection Pucp Rotor Dynamic Analyses", by

-J Franklin Research Center, Report FC4982, dated May 1980.

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2.) There mayabe natural frequencies associated with the. pump 1.

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pssembly which occur near thel operating speed of. the. pump...

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on bearing diametral clearance, rotor unbalance conditions

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a and housing flexibility. As an example, if the wear.in g;.; -

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column journal bearings becomes sufficiently large

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these bearings are no longer active and the undamped 1-c

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critical f requency near the operating speed of the, pump _

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This wear can continue until the shaft

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potentially sever the shaf t.

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. pump shif t Is to utilize a journal bearing design which

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exhihkts'1 table characteristics.

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' Taper land bearing". This design is more stable than the s

plain journal bearing, is less susceptible to wear because of the t' aper and will'eause the bearing to form a hydro-dynamic film quickly during startup.

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4.). Stiffenir.g..of. the column se'etions of the pump is

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1 advantageous if there is a column frequency near the gen e.

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. column frequency to a higher level will eliminate

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. column frequency..

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hL flCW in'1.e:t,cond.1t.' ions.to.the pumps and sump designs can a....... -...

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be important to pump operability.

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have demonstrated flow characteristics which produced

..,iq vortexing at the be11 mouth of the pumo. This vortexing is duetto sump design or sump supply line e'ntrance con-

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ditions. This condition can contribute to additional pump vibration and wear., Flow straightener devices, reduction of be11 mouth diameters, and bottom clearance reductions have proven to be effective in eliminating

' this problem.

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S.) This type of pump has exhibited operational proSlems due to design and, installation deficiencies. The high flexibility of the shaft and column make this design rather forgiving when it comes to insta11aiton deficien-i cies such as misalignment between the shaft and column, e

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low-precision ce rpi.ing assemblies, and non-perper.di,cular;,

2. mounting. flanges. c This_. fact however, can. lead to.ex,cessive bearing wear without:significant. notice,able change in(p, ump operating characteristics...To, ensure proper;pu. p.ogeration, -

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prop e r al i g nmen t: sh oul d b e e s tabl,i she d :b e twe e n..all c

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s6rf aces; and measures shoul,d be: emphasized ghtch: prev'ent colu and shaf t eccentricitiesr--These measuresican include optical f

alignment.of th'e column segme.nts,;use.cf high. precision coLplings and use.of accurate : techniques to establish that

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the~ sump plumb line is perpendicular to the pump mounting

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The above findings and conclusions have contributed significantly The guidelines listed to the development of these guidelines.

The subjects below are divided into insta11ation and test areas.

to be addressed in these areas are considered to be of' prime.

importance when establishing a pump operability assurance program.

The extent to which each of the two are'as are implemented at a specific facility is dependent on specific symptoms which have been identified with these pumps,'thile in operation and during service periods.

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2 fr.pl e=enting'the' messur,.es outlined below, at North Annt 1 & 2 in

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CNG1 be operable whed,'reqilf red'for th'etr safety fur.ction. These o

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trguideline..s 'are not ' intended to 'repla:ce:s. ethe requirements of i

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r~e~q'ui'r'e' men'ts presently'EnfoirceY by' 'th'e~s'ta'f f.'

Rather, the 4

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GUIDELINES FOR OPERASItLTY INSTALLATION:,:n.. n :ni: ed

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1.0 INSTALLATIO

N. PROCEDURE

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.Experie,nce..has.shown.that.these pumps are prone to -having: operability problems as' a result of poor installation procedures. The guidelines emphasize those areas of the installation procedure, which if implemented, could significantly improve the itkelihood of an operab1'e pump.

The procedures utilized should be submitted to the staff for review.

1.1 PUMP INSTALLATION Determine by measurement that all shaft segments are straight s.

witnin tolerances specified by' the manufactur'ir.

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Dete,aine by measurement or provide certification that [11 couplings (for shaft segments & ' pump to motor coupling) are, '

of high prcct:, ion as specifled by the manufacturer.

Determine by measurement that all pump segment flanges are c.

perpendicular to the centerline of the segment, that the segments are straight and that any mating surfaces are.

. concentric to <n established" datum, d ere Jourdai ~ '~

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, bearing guides (SPIDERS) are used; establ.jsh con'- ;#.it..s O centricity.between this asseebly'and its mating surface.

di:. Align full pu'mp casing a'sserbly optically)to' assureW maxicum straishtness and concentricity ofdhe.a'sse:61f.'w Any. equivalent method is acceptable, as long as the

c. procedur'e stresses column straightness and consentHtitKrF r

AssVre. pump: t'otdot'or flan'ge" perpendicularity and that

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prcper 'coupli ng' fnitall a'tionfi's' perf crie'd.

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Assiare th~at'M1 mating surf ace bolting is properly f.

att' ached and'tha't manuf acturer torquing sequences are

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1.2 SUP.P INSTALLATT.ON Assure (where use'd) that sump /pucp mating flange a.

is perpendicular to the sump purp line.

l Assure that sump design prevents fluid anonulieY b.

such as vortexing or turbulence near the intake i

to the pump De11 mouth and that incoming piping is not so designed as to allow fluid conditions '

f avorable to these anomalies (i. e., sharp -

bends in piping prior to entrance.into sump).

Assure that interference does 'not exist between c.

the suv and iny pump appendage such as a seismic restraint.

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-8 2.0 Testing Recuirements The installation procedures are essential in establishing pump r-H rs. 'us. - -

0 operabilityw In additio.-n d. :n-to careful installation, testing;~may

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be required which 'willlerify p~ roper operation of these pumps.

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- i u-Af ter cogistion of'the installation checks, licensees or,appli

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=L ca'nts should' evaluate thi' ne,cii for further testing a.nd report

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,the.results 6f' this' ~e~ialdatTo,n, together.with the details of any.

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test plans to the 'st'aff.

Sh'du'1d tests be required, an acceptable p nt:.- -: _e :n '" -m: W test procedure should i'licidd~etWe* items listed.hmlow.

The. staff

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recognizes tfi..

he~ instrumentatio...er : sn and procedures outlined below.

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may be difficcit to i@leininf.~ at all f acili~ ties ar.d. therefore, the '

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staff is eghisiiing good installation practices which lead to operable c'omonents. - If tests derenstrating operability cannot encogass all the items listed below, then alternative procedures should be proposed for evaluation' by the staff. The tes,ts should e=phasize measurement of pump dynamic characteristics and wear data

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at different stages of testing, culminating with an extrapolation of the data to the desired life goal for the purrp.

2.1 ' Test Instrumentation The following instrumentation should be incorporated into the test procedure aside from norial flow measu'rement, pressure and-vibration instrumentation:

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X, Y proximity probes at three axial locations on the 4.,.

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purrp c61iim5,"for rseisur'ing and re'cordin'g~ra' dial ~p'o'sitf ons "o'f

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'shafi~4ith' fe's'p*ect to the column.

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X, Y, icceler'odeters (at proximity probe locations) 4

'for dea ~dur~in] kndlecordingilhi51 a[deUerations of the

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Shaf.t ;, Rotational speed, and dynami,c variation instrument.

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2.2 ' PRE-TEST DATA

. With the pump disassemble,d, measure all jcurnal bearing 0.D.'s,

- bearing 1.D.'s and calculate bearing diametral clearances. In.

addition with pumps fully sssembled and using the proximity probes,

obtain the " clearance circke" at each of the three axial' stations by rolling the, shaf t section within the clearance volume of'iti bearings and in this way, establish proper operation of the p,rhbes.

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.rc !:H ap tha :!..:.sa ;a ; rid. Dr.;a sc nPNASE 1 Testing _ (6 ho l

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This phase cf testing should be co= prised of 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> of

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~;> testing (Sreakin) fo11 owed.by:1 start-stop. testing;hTest etcbrditionstshould _ simulate as nearly as,pos,s,1ble normal.

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i. And' accident.c6nditions

Parameters;to b'e:co'nsidered if

,i are; flow,it.emperature, debris, and chemical compost'tfon 2 6f fluidrbeing' pumped.irStitiI::torqueitssts'shoidibei

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(i.e. measure amount of performedsbefore'and af ter the test l

Data should be torqui rdquired to: turn shaft by hand).

j taken:du'ringithe six hcur test at 1/2 h:ur intervals.

'A. total of 12 start-stop testscwill'be' performed con-

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sisting of a start up from zero speed up to full-speed, 10-minute dwell at full-speed and a shutdown, from full speed to zero speed, with re:ording of all instrumentation during full cy:le of start-stop.

Upon completion of Phase 1 testing,the following data should b

be obtairied and recorded:

4 Obtain the' ' clearance circles

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proximity probes. -

Tests at North Anna 1 & 2 and Manufacturers input 2

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P.easure and record the following' dimensions fcr each bearing:

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THE /.CCEPThiCE' CRITERIA 15'AS.F01.i.0W5:

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3 bearing, wear is unacceptable

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. and test should be terminated.....

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...,Reasse:.ble the pump a.)

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b. ) Obtain ". clearance circles".

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c. ) Reinstall pump in test loop. '-

2.4 Phase 2 Testing (4B hours)

Phase 2 testing is to be performed at full system pressure.

and tecperature and fluid conditions sinulating those expected Before start and at during accident and normal operation.

cor:pletion of Phase 2 test,obtain measurement of static torque.

Data should be recorded continuously during th'e start-up period,

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3This acceptable wear value may be modified based on ::anufacturers recomendation.

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car and during' the shutdown period. Data should also be recorded the rt

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'.f the use r.sior.

ces.s.

e...d ::at 1-hour time interva'Is during the 48 he'ur test.

f a.:r,q:: n e 2..- i.. ::r

le ab: of Na- '5 m ui :: a vah:

The..f.ollowing mosurey. nts should;be.made;.at:th.e:coagletlone:ui e e

of t:= ;ine wi:n weae of 3 r.ib Af P.hast-2;of tite test:- eree::

1<).d0.btain the:"c-le.ar.ance.;c.ircles; u.si.ng..the..th e4 Jets _gof T

3.

~

I f :d ei st :n.3) tes:ing requi -PJ9X.im.ity p.r. bes. tr i s 2:ce n35'. c.

o 2 ).. Me_a.sure.- a..n.d. r.eco..rd..t_h_e..f o_1I_l owing d. j ri. n.si...o. ns_

. ~

rf e,bea. rips:ing ? 33 3 3 wt :n wi13.- n:3;;:n:3 :rs. ri3 27. g

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.b L.S c.ar,i ng. I 0s ; p-

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c. ) Bearin9 to Jcurnal diametral c. lear.ance...

m.

d.) Establish accuculated bearing wear.

THE ACCEPTANCE CRITERIA 15 AS F0Lt.0W5:

If accuculated bearing wear on any bearing is 1.)

>7 mils, wear is unacceptable and test shculd be terminated.

.. 2.). If accupulated wear en all bearings iso mils 5

/

for all bearings.

a. )

Reassemble pump

b. )

Obtain " clearance circles" -

c.) Reinstall pump in test icop.

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a.

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. ! :." thi_s_pha.seJas wi'ti zttie'o.ther.jhases.i.t t.h.-the-fo11 ewing.Scceptace ~~n7_

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.c -wear -is Qn, acceptable and test:should be terminated. _.!-. L.-",. ~,

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2.)

If accu'nulated wear is ( 8 mils for all bearings,3

~

a s

decision needs to be.made to estabitsh:

a.)

the need for additional testing or b.)

whether or not the bearing wear will be acceptably low.

The recommen'ded decision process is outlined be.;ew.

m

. Plot the values of taccu:nulated year.versus time (H) for. each -+--

L

, bearing after Phase 2 and Phase 3 tests,'namely.

Wear at H2 = 54 hour6.25e-4 days <br />0.015 hours <br />8.928571e-5 weeks <br />2.0547e-5 months <br />

~

^

Wear at H3 = 150 hours0.00174 days <br />0.0417 hours <br />2.480159e-4 weeks <br />5.7075e-5 months <br /> e e 1

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~--

u

a s,

e.

. ',...,"

• 3,-

n-o 14 -

Straight lines are then drawn through the plotted values of wear If the extension j

and extended to the right (See example Figure 1).

intercepts the maximum acceptable value of wear (8 mils) at a value H 1ess than the life goal for this pump, additional testing should i

If the intercept of the line with wear of 8 mils l

be performed.

exceeds the life goal for this pump, no additional testing is.

If addition.a1 testing required and bearing wear is acceptable.

is deemed necessary it should be done in a similar manner to that perfor ned during Phase 3 with similar accertance criteria and It is expected that such additional testing decision process.

will either show a stable pump operation with no increase in bearing wear or increased bearing' we'ar with unacceptable results.

l Evaluation of Pumo Acceptability _

2.6 If bearing wear (af ter all testing phases) is accepi. ably low (as per decision process) and if vibration levels over the frequency spectrum of 3 cps to 5000 eps are acceptably low and show no unfavorable tren 4

of increasing magnitude during the testing, the pump may be judged acceptable for its intended use.

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