ML20038C432
| ML20038C432 | |
| Person / Time | |
|---|---|
| Site: | Clinton  |
| Issue date: | 11/23/1981 |
| From: | Tedesco R Office of Nuclear Reactor Regulation |
| To: | Wuller G ILLINOIS POWER CO. |
| References | |
| IEB-79-15, NUDOCS 8112110027 | |
| Download: ML20038C432 (3) | |
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NOV 2 31981 Docket No.: 50-461 MC. s, za,.
f!r. George Wuller o_'
Supervisor-t.icensin,
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to Dear Fr. Vu11er Q
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Subject:
Long Term Operability of Deep Draft Pumps Q Jj u gf-m
-v IE Bulletin 79-15, dated July 11, 1979, was issued to all licensees and holders of construction permits as a result of deep draft pump deficiencies i
that were identified at facilities both operating and under construction.
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For pending OL appifcations, long tem operability of deep draf t punps is j
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 Operahility of Deep Draft Pumps". Within 30 days from the issuince date of this letter, you should provide a schedule indicating when a response, in the fom of a supplement to FSAP. Section 3.o.3, would be provided that discusses your assurance progran for deronstrating long tem operability of your deep draft pumps and the extent to which it confoms to the various portions of these Guidelines. Erphasis should be placed en (1) the establishnent of installation procedures that are followed each time thesa punps are disassenbled and reinstalled, and (2) the testing recuirements and bearino wear criteria. The instrunentation called for in the Guidelines should not be considered a requirenent.
These Guidelines establish an accepta5le nethod of assuring long tem oparability of deep draft pu ps. They do not necessarily constitute the only -:ethod for demonstrating long tem operability. The staff will review the infomation you submit to determine Whether your long tem operability l
assurance prograr. for deep draft punos is in sufficient confomance with these Guidelices to assure long tern operability.
If not, the staff will detemina whether you have established an t utilized other methods and procedures, nre'erably with the assistance of the pump canufacturer, that also de-onstrate and assure thit these purps will oerfom their intended functions for the lenqth of tire required.
8112110027 811123 PDR ADOCK 05000461 l
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2 Mr. George Uuller NOV 2 31981 If you have any cuestions regardino this matter, please contact J. 4. Williams, the Licensing Project "anacer for your facility.
The aeplication/reportinq recuirenents contained in this letter have been approved by the Office of lianacerent and Budget; OM9 Approval Fo. 3150-0011.
Si nce,rel y.
Origins 1 Signed by llobert L. Tedesco Pohert L. Tedesco, Assistant Director for Licensinq Division of Licensin?
Office of Huclear Reactor Reculation
Enclosure:
Guidelines for Demonstration of Operability of Deep Draf t Pumps cc w/ enclosure:
See naxt Dane DISTRIBUTI0ft:
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IllinoisPowerCbmpany ~
'cc w/ enclosure (s):
Mr. L. J. Koch, Vice President Hugn K. Clark, Esq. Chairman Illinois Power Company P. O. Box 127A 500 South 27th Street Kennedyville, Maryland 21645 Decatur, Illinois 62525 Dr. Oscar H. Paris Mr. Julius Geier Atomic Safety and Licensing Board Illinois Power Company U. S. Nuclear Regulatory Commission 500 South 27th Street Washington, D. C.
20555 Decatur, Illinois 62525 Atomic Safety and Licensing Board Peter V. Fazio, Jr., Esq.
Appeal Board Panel Schiff, Hardin & Waite U. S. Nuclear Regulatory Commission 7200 Sears Tower Washington, D. C.
20555 233 South Wacker Drive Chicago, Illinois 60606 Dr. George A. Ferguson School of Engineering Mr. H. H. Livermore, Resident Inspector Howard University U. S. Nuclear Regulatory Commission 2300 Sixth Street, N.W.
RR 3, Box 229A Washington, D. C.
20059 Clinton, Illinois 61727
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Mr. D. L. Foreman, Project Manager. '
Richard J. Goddard, Esq.
Office of the Executive Legal Director General Electric Company U.'S. Nuclear Regulatory Commission 175 Curtner Avenue, M/C 682 Washington, D. C.
20555 San Jose, California 95125 Mr. R. C. Heider, Project Manager Mr. Charles Bacon Sargent & Lundy Engineers Prairie Alliance 55 East Monroe Street P. O. Box 2424 Chicago, Illinois 60603 Station A Champaign, Illinois 61820
- Reed Neuman, Esq.
Assistant Attorney General Philip L. Willman, Esq.
500 South 2nd Street Assistant Attorney General Springfield, Illinois 62701 Environmental Control Division 188 West Randolph Street Suite 2315 Chicago, Illinois 60610
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'. s ENCLOSURE GUIDELINES FOR DEMONSTRATION OF CPERASILITY OF DEEP DRAFT PUMP 5 DISCUSSION I.E.Bulletin 79-15 dated July 1979, identified proble=s asscciated with deep-draf t pumps found at operating facilities and near term operating licensee facilities, Deep draft pe=ps,which are also called
- vertical turbine p. umps are usually 30 tc 50 feet in length with i=pellers lecated in casing bewis at the 3cwest elevation of. s,-
the pe=p.
The =cter (driver) is 1ccated at the highest pu=p elevition with the discharge no::le just below the =cter.
Bulletin 79-15 was initiated because several nuclear pcwer plant facilities ceuld net de=enstrate operability of their c =ps.
The pumps were experiencing. excessive vibration and' bearing " wear.
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rapid bearing wear suggested that these pu=ps ceuld net perfer=
their re;uired functicas during or follcwing an accident.
As a result cf the staf f's initial review cf the respen:es to III 79-15,.
. several~ plants were identif'ied as having pctential preble=s with thei r' deep.dra f t pu=;s.
These guidelines are previded fer these '
plants se that the licensee er applicant involved =ay have a method acceptable to the staff.for de=enstrating the cperability cf deep-draft pumps.
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2-DEEP DRAFT PUMP OPERATING CHARACTERISTICS In order to better understand the operating characteristics of 1
these pumps, a retor. dynamics analyses was performed to ascertain the respcase of the pump retor under steady state cperation.
The i.nalyses censidered journal bearing to shaft dynamic respense at varicus eccentricities and fluid viscesit.ies.,,The cedel for
-the analysis depicted a typical' deep draft pug utilized by the
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nuclear industry.
The analysis resulted in ree,cmendation,s for improving the stability of the pun roter from externally applied
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inputs and by self-generated inputs.-
The cenclusiens which were derived frim the analysis and staff evaluatiens of Serth Anna, Beaver Valley and Sur y facilities with similar pups include:
1.)
Fugs with this type cf configuration are prone to bearing whirl Yibratica prcbler:s due to the flexibility Cf the retCr and casing struccure.
This phencmenen is accentuated as jcurnal bearing clearance becc es large.
This phencrenen leads to bearing wear (Jeurnal bearings).
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't.cw Head Safety Ir.jection Pug Reter Dynamic Analyses', by Franklin Research Center, Report FC4332, dated May 1980.
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2.) There may be natural frequencies associated with the pump assembly which cccur near the operating speed of the pg=p.
Ru=p operation will drive these frequencies ind can cause bearing wear. The severity of this conditten is dependent on bearing diametral clearance, rotor unbalance conditions As an example, if the wear in and housing flexibility.
column journal bearings beco=es sufficiently large (twice the original diametral clearance) so that
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these bearings are no lenger active and the undamped critical frequency near the cperating speed of the pump is allcwed to expand, the additional uncontrolled bea.-ing wear will cecur..This wear can centinue until thi shaf t rubs against the support structure of the bearing and can pctentially sever the shaf t.
3.) One acceptab'e method fer correcting instabilities in the pum; shif t is tc utili:e a jcurnal bearing design which t
exhi$its stable characteristics.. One such design is the
' Taper land bearing'.
This design is mere stable than the plain jcurnal bearing, is less susceptible to wear because of the taper and will ~ ause the bearing to form a hydro-c dynamic film quickly during startup.
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Stiffening of the cole =n sections of the pu=p is
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advantageous if there is a column frequency near the cperating speed of the pu=p.
The shi f ting of the
_.. colu=n. frequency to a higher level will eliminate any c:upling between the pump, operating speed and the coluen frequency.
m e-5.) Flew inlet conditions to the pumps and su p designs can
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be i=pertant to' pump eperability.
Certain installations have de=enstrated flew characteristics which produced ve.rtexing at the be11 mouth of the pump. This vertexing
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is due te sump design or su=p supply line e$ trance corr-ditions.
This cendition can contribute to additional pu=p vibration and wear.
Flow straightener devices, redu::icn of bell =:uth diameters, and bett:= clearance reductions have preven : be ef fective in eliminating this pr:blem.
S.) This ty;e of pump has exhibited cperational prc51e=s due to design and installation deficiencies. The high flexibility of the shaf t and column =ake this design rather fergiving when it ccces to insta11atien deficien-cies such as misalignment between the shaf t ar.d cele =n, E
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1cw-precision coupling assemblies, and non-perpendicular mounting n anges. This fact ho~ wever, can lead to excessive bearing wear without significant noticeabie change in pump operating characteristics. To ensure preper.pu=p operation, proper alignment-sheuld be. established-between all-matin;g.
-' surfaces and measures should be emphasised which prevent coloma-and shaf t eccentricities. These measures can include optical-l align =ent of the column seg=ents, use of high precision couplings and use of accurate techniques to establish that the sc=p plumb if ne is perpendicular to the pu=p mounting fl ange.
The above findings and conclusions have centributed significantly to the devel:pment f these guidelines. The guidelines If sted I
belew are divided into insta11aticn and test areas.
The subjects i
to be addressed in these areas are c:nsidered t: be cf prime l
f-i=portance when establishing a pu=p cperability assurance pregram.
i The extent to which each cf the two are'as are imple=ented at a l
specific facility is dependent on specific symptems which haYe been identified with these. pumps while in operatien and* during service periods.
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., I.e.ple=enting the measures cutlined belew, at North Anna 1 & 2 in tota \\ has been shown to provide reasonable assurance that the pumps will be cperable when required for their safety function. These guidelines are' not intended to' replace the requirements of-
' Standard Review plan 3.g.3, Regulatory Guide 1.58 or any othir rhquirements presently enforced by the staff.
Rather, the
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guidelines are to be use'd.as supp1'ementary mater'f al for establishing
...~'~ deep-draf t pump operabilit.
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- -GUIDELINES FOR OPERA 5ILITY INSTALLATION.
1.0 INSTALLATION PRDCEDURES
... Experience.has shown that these pumps' are prone to having operability proble$s as a result of peer insta11atten precedures.
The guidelines emphasi:e these areas of the installation precedurt which if imple=ented, '
cculd significantly improve the, likelihced of an operable pump.
The
- Scedures utilized shculd be submitted to the staff for review.
1.1 ? UMP INSTALLATION Determine by seasurement that all shaft segments are straight a.
within tolarances specified by the manuf acturer.
b.
Determine by measurement or provide certification that all ccuplings (for shaft segments & ' pump to octor ecupling) are of high precision as specified by the manufacturer.
c.
Determine by measurement that all pump segment flanges are perpendicular to the centerline of the segment, that the segments are straight and that any =ating surfaces are concertric to an established datum. 'ihere icurn'al '~ ~
, bearing guides (SPIDERS) are used, establish con-centricity between this assembly and its mating surface.
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d.
Align full pump casing assembly cptically to assure s
maximum straightness and concentricity cf the asse:61y.
Any equivalent method is acceptable, as long as the prccedure stresse'; column straightness and'cencentricity.."
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s Assure pu=p to motor flange perpendicularity and that
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preper coupling installatica is perf erred.
f.
Assure that all mating surface belting is properly attached and that manuf acturer terquing sequences are adhered tc.
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1.2 SUMP INSTALLATION Assure (where used) that sump / pump mating flange a.
is perpendicular to the sump pump line.
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3.
Assure that sump design prevents fluid ancmalies 1
such as vertexing er turbulence near the intake te the pump tellmcuth and tha: inccming piping is not so designed as to allev fluid conditiens f avorable to these ancmalies (i. e., sha rp bends in piping price to entrance. into sucp).
t c.
Assure that interference does nct exist between
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t the surp and argy pu=p appendage such as a seismic restraint.
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1 2.0 Testina Reduirements The installatien precedures a.re essential in establishing pump.
operability.
In addition to careful ir.rtallatica, usting may be required which will verify proper operation of these pumps.
After cc.cletion of the installation checks, licensees or appli-cants should evaluate the need for further testing and report the.results of this evaluation ~tegether with the details of any test plans to the staff.
v-Should tests. be required an acceptable test precedure should include the ites listed Aslew.
The staff recognizes that the instrumentatien and procedures cutlined below.
may be difficult to ir;:lement at all f acilities and, therefere, the staff is eghasizing geed installation p'ractices which lead to cperable c'ce;:enents.
If tests demonstrating c;erability cannet enecimass all the iter..s listed belew, then alternative peccedures shculd be propcsed for evaluation by the staff.
The tests shculd e=hasize reasurement of pc~; dynamic characteristics and wear data at different stages of testing, culminating with an ecrapelatien cf the data tc the desired lif e scal f er the pump.-
2.1 Test Instrumenta:icn The follcwing instrumentaticn shculd be ineceperated i e the test procedure aside from normal ffew meatu'rement,
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pressure and vibration instrmentaticn:
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a.)
X, T proximity probes at three axial locations on the pu=p column, for measuring and recording radial positions of shaf t with respect co the column.
b.)
X, Y, acceleremeters (at proximity probe locations) for measuring and recording radial accelerations of the column.
c.) Cjnamic. pressure transducers for. measuring (1uid pressure at the following locations :
~ ~ ~ ~
1.
Bottom o'f Column (suction) 2.
Mid-Cclumn 3.
Tcp of Column.
d.)
Shaf t Rotational speed and-dynamic variation instrument.
2.2 FRE-TEST DATA With the pump disassembled, measure all 'jeurnal bearing 0.0.'s, bearing I.D. 's and calculate bearing diametral clearances.
In additien with pumps fully assembled and using the pecximity prebes,
, cbtain t' e " clearance circle" at each of the three axial stations by rolling the shaf t section within the clearance volume of'its bearings and in this way, establish proper operation of the probes.
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1 10 3.1 PNASE 1 Testing {6 hours plus start-stop)
This phase of testing 'should be cc= prised of 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> of testing (3reak-in) followed by start-stop testing.. Test conditions should simulate as nearly as pos,s.,ible normal and accident conditions. Parameters to be considered are.flev, temperatur.e, debris, and chemical ccmposition of fluid being pumped.
Static torque tests should be-performed before and af ter the test (i.e. measure ancunt of
~
torque required to turn shaf t by hand).
Data should be taken during the six hcur test at 1/2 heur intervals.
A.tetal of 12 start-stop tests will be performed con-sisting of a start up frem zero speed up tc full-speed, 10-minute dwell at full-speed and a shutdevn fecm full speed to :ero speed, with reccrding of all instrumenta:icn during full cycle of start-step.
'Jpen ccmpletten of Phase 1 testing,the f.cilc<ing data st.culd be cbtained and recorded:
1.) Obtain the ' clearance circles" using the ' three sets of proximity probes.-
2 Tests at North Anna 1 a 2 and Manufacturers input indicates that 5 hours5.787037e-5 days <br />0.00139 hours <br />8.267196e-6 weeks <br />1.9025e-6 months <br /> is an adequate time interval for bearing " break in" period.. -
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2.) P.easure and record the following dimenstcnt for each bearing:
a.) Jcurnal 0.0.
b.) Bearing I.D.
c.) Searing to Journal diametra1 clearance d.) Establish Phase 1 test bearing wear.
THE ACCEPTANCE CRITERIA IS AS FOLLOWS:
1.)
If wear is) 5 mils for any bearing ' wear is unacceptili,le.
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and test shculd be terminated.
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3 2.)
If wear is( 5 mils for all bearings
- a. ) Reassemble the pu:q
- b. ) Obtain " clearance Eircles"
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- c. ) Reinstall pump in test leep. -
2.4 Phase 2 Testine ('S hours)
Phase 2 testing is te be pe-f:rred at full system pressure.
and tegerature and fluid cenditiens st=lating these expected duri..; 3::ident and norral 0;eratien.
Bef re start and at c:::cleticn cf Phase 2 test,chtain reasurerent cf static terque.
Data should be rec:rded centinucusly during the star.-up pericd, 3This acceptable wear value may be ecdified based en m.anufacturers recc m.endaticn.
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6 and during the shutdown period. Data should also be recorded at 1.heur time intervals during.the 48 hour5.555556e-4 days <br />0.0133 hours <br />7.936508e-5 weeks <br />1.8264e-5 months <br /> test..
The following measurements should be made at the cc:pletion of Phase 2 of the test:
1.) Obtain the " clearance circles
- using the three sets of
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proximity 'pecbes.
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2.)- Measure and reccrd the following dimensions for'each bearing:
a.) Jcurnal 0.D.
b.) Searing I.D.
- c. ) Bearing to Jcurnal diaretral cleerance.
d.) Establish accuculated bearing wear.
THE ACCEPTANCE CRITERI A 15 AS FOLLOWS:
1.)
If accuculated bearing wear en any bearing is
)7 niis, wear is unacceptable and test shculd be t ermi na ted.
2.)
If accurulated wear en all bearings is(7 mils 8
for all bearings.
f-
- a. )
Reassemble pump
- b. )
Obtain " clearance circles" -
- c. )
Reinstall pump in tes 1cep.
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Phase 3 Testing (96 hours0.00111 days <br />0.0267 hours <br />1.587302e-4 weeks <br />3.6528e-5 months <br />)
Phase 3 testing is to be perfomed at full system pressure and temperature and fluid conditions simulating those expected s
during accident and nonnal operat' ion.
The same procedures should be follewed as in Phase 2 testing except that data
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may be taken with less frequency.
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The same measurements should be taken at the ecmpletion of.'
this phase as wi'th the other phases with the following acceptance criteria:
1.)
If accumulated bearing wejr is> B mils for.any bearing3 wear is unacceptable and test should be terminated.
2.)
If accur.ulated wear is ( 8 mils fer all tearings,3
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a decision needs to be made to establish:
a.)
the need fcr additicnal testing er a
b.)
whether er not the bearing wear will be. acceptably Icw.
The reccmmended decision process is cutlined belcw.
Plot the values of accumulated wear versus time (H) for each
~
bearing after Phase 2 and P.hase 3 tests, namely.
~
' dear at H2 = 54 hour6.25e-4 days <br />0.015 hours <br />8.928571e-5 weeks <br />2.0547e-5 months <br />
' lear at H3 = 150 hours0.00174 days <br />0.0417 hours <br />2.480159e-4 weeks <br />5.7075e-5 months <br /> p
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Straight lines are then drawn threugh the plotted values of wear and extended to the right (See example Figure 1).
If the extension intercepts the maximum acceptable value of wear (8 mils) at a value H less than the life goal for this pu=p, additional testing should be performed.
If' the intercept of the line with wear of 8 mils exceeds the li.fe goal for this pump, no addi.tional testing. is...
required and bearing-wear is acceptable.-
~
. If addition.a1 testing-is deemed necessary it should be done in a similar :.anner to tha5
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perfor ned during Phase 3 with similar acceptance criteria and i
decisien precess.
It is expected that such additional testing will either show a stable pu=p,cperation with no increase in bearing wear or increased bearing wear with unacceptable results.
2.5 Evaluation of Pu=o Acce:tability If bearing wear (af ter all testing phases) is acceptably 1cw (as per de:isi:n pr: cess) and if vibrati:n levels ever the frequency spectrum of 3 eps :: 5000 c;s are acceptably 1cw and shew ne unfav:rable trend cf increasing magnitude during the testing, the pump may be judged ac:eptable fer its intended use.
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