ML17053A853

Rept Re Limitorque Valve Operator Test for Meeting General Requirements of Electrical Valve Actuator in Nuclear Reactor Containment Environ.Prepared by Philadelphia Gear Corp

ML17053A853
Person / Time
Site:	Nine Mile Point
Issue date:	01/02/1969
From:	FRANKLIN INSTITUTE
To:
Shared Package
ML17053A854	List: ML17053A853 ML17053A855 ML17053A857 ML17053A858 ML18037A184
References
NUDOCS 7907300160
Download: ML17053A853 (16)

Text

~~L4~PHILADELPHIA GEARCORPORATION KINGOFPRUSSIA,PENN.19406LIMITORQUE VALVECONTROLTESTOFLIMITORQUE'ALVE OPERATOR.TOMEETGENERALREQUIREMENTS OFANELECTRICVALVEACTUATORINNUCLEARREACTORCONTAINMENT ENVIRONMENT TESTREPORT3'ANUARY2,1969sooEGG~gogS

TESTREPORT-JANUARY2,1969ENGINEERING ORDERNO.600198TheLimitorque valveoperatortestedwasModelSMB-0witha15foot:pound,3phase,60cycle,440voltmotor,w~ithseg~~ightemperature motorinsulation andhightemperature resistant non-\,e~r~~~~Wmetalliccomponents, towithstand the~contemplated steampressure, hightemperature andchemicalconditions expected.in.theeventofanuclearreactorfailure.within.the,.containment vessel.TheLimitorque.

operatorwaswiredforatorqueseatingcontrolforclosingdirection andpositionlimitingcontrolforopendirection.

'IA23/8"diameterby1/4"pitch,1/4"lead,lefthandstemwasusedtosimulatethestemofavalvebeingopenedandclosedThespeedofoperation wasapproximately 6"perminuteovera12"travel.LThedesignedseatingthrusttobeexertedonthe.stembytheLimitorque valvecontrolwas16,500poundsofthrustintheclosedpositionofthevalvestem.Aslidewireelectricpositiontrans-mitter.wasalsoinstalled andconnected toaremotepositionreceiveroutsidethetestchamber.TESTSTOBEPERFORMED ONOPERATOR1.Preliminary heattestsoncomponent parts.2.Preliminary heattestsonactuator.

3.Preliminary livesteamtestonactuator.

4.Heatagingtestofelectricmotorandelectricmotorwithbrake.

5.Shockandvibration testofactuatortosimulateseismicconditions.

6.l50lifecycletestofactuatorproducing approximately 16,500poundsofthrust.7',TestofLimitorque valveoperatorandelectricbrakemotorunderasimulated reactorcontainment post-accident steamandchemicalenvironment.

l.PRELIMINARY HEATTESTSONCOMPONENT PARTSThestandardLimitorque operatorgearedlimitswitchandtorqueswitchwassubjected toadryheattestforapproxi-mately16hoursatatemperature of375'F.Periodically duringthistest,theswitcheswereremovedfromtheovenandactuatedbyhand.Theoperation wassatisfactory andnomal-'unctions occurred.

Allpartsfunctioned freelyandtherewasnobinding,jamming,norabnormaldistortion of.parts.Thetestwassuccessful inallrespects.

2.~PRELIMINARY HEATTESTSONACTUATORAcompletely assembled andoperational Limitorque operatorwasplaced.inanovenwherethetemperature wasmaintained atapproximately 325'F.foradurationof12hours.Theunitwaselectrically operatedeverythirtyminutesforaperiodofapproximately twominutespercycleandusingthegearedlimitswitchestostoptheactuatoratthefullopenandfullclosedpositionoftravel.Indicating lightcircuitswerealsowired.tothegearedlimitswitches.

Thetestwassuccessful ineveryrespect.Therewerenomalfunctions oftheoperatoranduponinspection ofthecom--ponen'tpartsused,therewasnonoticeable deterioration orwear.Thelubricant usedinhegearedlimitswitchdidbecomehardandcaked,howeverthelubricant usedintheLimitorque

gearhousingremainedpliableandhaditsoriginalconsistency.

Itwasdetermined thatthegreaseinthegearedlimitswitchgearhousingshouldbechangedtothesamegreaseasintheLimitorque operatorgearhousing.3'..PRELIMINARY LIVESTEPSTESTONACTUATOR~AcompleteLimitorque actuatorwassetupforelectrical operation andlivesteamwaspipedintotheconduittapsonthetopofthelimitswitchcompartment.

Oneofthebottomconduittapswasleftopentodrainoffanycondensate.

Theoperatorwassetuponatimerbasisforoperation overaperiodofapproximately ninehoursandoperating everythirtyminutesfortwominutespercycle.Duringthistest,thelivesteamintheswitchcompartment seemedtohavenoeffectwhateveronthefunctionofthe.limitswitchesin'heircontroloftheoperatoratthefull.openandfullclosedpositionoftravel.Inaddition, thelimitswitcheswerewireduptoindicating lightswhichoperatedsatisfactorily.

Thetestwassuccessful andtherewasnonoticeable effectonthefunctionofanyofthepartsinthelimitswitchcom-partment.

4.HEATAGINGTEST.OFELECTRICMOTORANDELECTRICMOTORWITHBRAKETheelectricmotorfortheLimitorque operatortobeusedintheenvironment testandanotherelectricmotorequippedwithadisktypebrakeweresub'jected toaheatagingtest.

BothelectricmotorsweresenttoReliance, ElectricCo.forheatagetesting.Thistestconsisted ofbakingthemotorsatatemperature of180'C.foratotalof100hourstosimulateagingthemotortoa40yearlifeexpectancy.

Motorinsulation checkswere.madeandfound.to.bewithinnormallimits.There.werenoadverseeffectsonthemotorsandmotorinsulation resi'stance measured'infinity toground.5..SHOCKANDVIBRATION TESTOFACTUATORTOSIMULATESEISMICCONDITIONS TheLimitorque operatortobeusedintheenvironment testwasshippedcompletetotheLockheedElectronics Co.,inPlain-.field,NewJersey,forshockandvibration testingtosimulateseismicconditions.

Acopyofthisreportisenclosedherewith.

Thetestbasically consisted ofmountingtheLimitorque operatoronashockandvibration tabletotestitat'20cyclespersecondvibration at.1Gloadforaperiodoftwominutesononeminuteoff.Thiswouldconstitute onecycle.Thecyclewasrepeatedfivetimesinboththeverticalandhorizontal axisoftheoperator.

Theactualtestreportandphotographs areincludedhere.Thetestwassuccessful andtherewasnonoticeable effectwhatsoever ontheLimitorque operator.

,~~~6~150LIFECYCLETESTOFLIMITORQUE OPERATORPRODUCING APPROXIMATELY 16,500POUNDSTHRUSTTheLimitorque operatorwasshippedtotheFranklinInstitute ResearchLaboratories, Philadelphia, Pennsylvania.

Theoperatorwasmountedonastandinsidethetestchamberanda150cycleloadtestwasmadeontheunit.Thistestconsisted ofstrokingthe23/8"diametervalvestematotalofapproximately 12inchesintwominutes.Thevalvesteminthefullclosedpositionproducedathrustof16,500poundsonarigidplatesecurelyboltedtothetestchamber.Thethrustwasmeasuredbythesamestrain-gauge recording instru-mentusedintheactualenvironmental testconducted bytheFranklinInstitute.

Theunitwaswiredupsothattheclosing(y.direction andtheopenpositiongearedlimitswitchstoppedtheunitinthefullopenposition.

Thespeedof.travelwas6inchesperminute.Afterthelifecycletestingwascompleted, theunitwasinspected and-foundtobeinexcellent condition.

Therewasnonoticeable wearonanyoftheparts.ThesameelectricImotorwhichhadbeenheatagetestedatRelianceElectricCo.wasusedforthislifeCycletest.Therewasnonoticeable adverseeffectontheelectricmotorandit.functioned properly.

7.TESTOFLIMITORQUE VALVEOPERATORUNDERSIMULATED

'REACTORCONTAINMENT POST-ACCIDENT STEAMANDCHEMICALENVIRONMENT TheattachedreportoftheFranklinInstitute ResearchLaboratories describes theactualtestingunderthisenviron-

wmentalcondition.

Afterthetest.wascompleted, theLimitorque operatorwasshippedbacktoPhiladelphia GearCorporation, KingofPrussia,'ennsylvania whereitwasdisassembled andall.partswereinspected.'hotographs areincludedshowingthevarious-partsoftheoperator.

Allparts,including theelectricmotor,slidewereposition'ransmitter,.

seals,bearings, gears,andshafts,wereinspected andnonoticeable wearwasnoted.However,thegearframe.ofthegearedlimit.switchhadcorrodedandcausedaminorfailure.Thegearedlimitswitchframehadbeenattackedbytheboricacidinthesteamatmosphere.

Thiscausedthegearframetocorrodeand..resulted inbinding,upoftheshaftsofthegearedlimitswitchwheretheyextendthroughthegearedlimitswitchhousing.Thiscausedthemalfunction oftheswitchasdescribed intheFranklinInstitute ResearchLabor-atories'eport.

Amaterialchangehasbeeninstituted tocorrectthiscorrosive actionofthematerialusedinthatparticular switch.Onallpresent'ordersbeingprocessed, andonallfutureunitstobeshippedtomeetenvironmental conditions suchasthis,thegearframehousingofthegeared'limitswitchwillbeabronzematerialwhichisnotsubjectltocorrosion byboricacidsolutions.

Themotorinsulation resistance afteralltestingwas1,000megohmsacrossall'threemotorterminals togroundat500volts.