F6000Word格式.docx
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-reductioninheatexchangeduetotheeffectofdeposits.
Thedegreeofcleanlinessistherequiredcleanlinessofagivensurfacepriortotestingandstart-upofthefacility.Thereareseveraldegreesofcleanliness.
Verificationtestsanddifferentlevelsofcriteria,asdefinedinF6300,areassociatedwitheachdegreeofcleanliness.
F6120APPLICABILITY
TherequirementsofthischapterareapplicabletomechanicalcomponentssubjecttotheRCC-MwhichconveyorareincontactwithoneofthefluidslistedinF6220(primaryfluids,secondaryfluids,componentcoolingfluidsandeffluent).
Forthesecomponents,themajorityoftherequirementsgiveninthischapterareapplicabletoallsurfacesincontactwithprocessfluids.
OnlytherequirementsgiveninparagraphsF6300,F6400andF6640arealsoapplicabletotheoutersurfacesofthesecomponents.
F6130TIMEOFAPPLICATION
Attheverylatest,therequireddegreeofcleanlinessshallbeachievedduringthelastphaseoffabricationinwhichtheverificationoftheapplicablecriteriaispossible,andshallbemaintaineduptoinitialfillingofthesystemwiththeprocessfluid.Cleaningshallbeperformedintheworkshopunlessotherwisestipulatedintheequipmentspecification.Furtherfabrication,conditioning,transportation,siteinstallation,etc.,processesshallalsoincludedispositionstopreserveand(or)restitutetherequireddegreeofcleanliness.
Slightdegradationincleanlinessbetweenthetimethecomponentiscleanedandthetimewhenthesystemtowhichthecomponentpertainsisfilled,shallbeacceptableprovidedthat:
-thereisnoadverseeffectontheconservationofthecomponent,i.e.thereisnocorrosionofthematerials,
-therequireddegreeofcleanlinessmaybeobtainedbythenormalcleaningoperationscheduledforalaterphase.
Therespectoftherequirementsgiveninthischapterlimitsremedialcleaningoperations.
TheManufacturershallspecifyatwhichphaseinfabricationheconsidersthattherequirementsofthischaptershouldbeapplied.Thisphaseshallbe,attheverylatest,thephaseatwhichtherequireddegreeofcleanlinessisachieved.
F6140STRUCTUREOFTHISCHAPTER
F6200specifiestherulesforassigningcomponentstooneofthreecleanlinessclasses.Therequirementsofthischapterarebasedonthisclassification.
F6200alsospecifiestherequiredambientconditionsforcleaningandsubsequentworkoperations(workareas).Theconceptofworkzonesontheconstructionsite,withspecificzonedesignationandconditionsapplicabletothevariousconstructionphasesaresimilarlyexplainedinthisparagraph.
F6300specifiestheteststobeperformedaftercleaningandtheassociatedcriteria.
F6400specifiesrulesforthepreventionofcontamination.
F6500specifiesrequirementsformainmethodsofcleaning.
F6600specifiestherequirementsforthepreservationofcleanlinessandforthefinalcleaningoperationsduringon-siteconstructionpriortostartup.
F6150REQUIREDDOCUMENTS
Operationsrelatingtocleaning,inspection,protection,preservation,packaging,storageandtransportationcoveredbythischaptershallbeperformedinaccordancewiththerequirementsspecifiedinproperlyidentifieddocuments(procedures,worksheet,instructionsheets,etc.)whichmustconformtotheapplicableparagraphsofthischapter.
Asthecasemaybe,thesedocumentsrelatespecificallytoagivencomponentorareapplicabletoaworkshoporconstructionsite.
TheyaredrawnupbytheManufacturerresponsiblefortheoperation.
F6200CLASSIFICATION
F6210CLEANLINESSCLASSES
Therearethreecleanlinessclasses,A,BandC(indecreasingorderofseverity),whichareassignedinaccordancewiththetypesofsystemandprocessfluidcontainedinsidethenuclearisland.
Cleanlinessclassificationisapplicabletothesurfacesofcomponentsincontactwithprocessfluids*.
ClassAisdividedintosubclassesaccordingtotheaccessibilityofsurfaces:
-SubclassA1coverscomponentsurfaceswhichinthefinalstagesofconstruction,aredirectlyaccessibleforcleaningandexamination.
-SubclassA2coverscomponentsurfaceswhicharenotassignedtosubclassA1.
-SubclassA2isitselfdividedintofurthersubdivisions.
.SubclassA21cleanlinessappliestothesurfacesofcomponentswhicharesensitiveorofcomplexshape,whichrequirespecialconditionsforcleaning.
.SubclassA22cleanlinessappliestothesurfacesofallothersubclassA2components,withtheexceptionofpipingandfittingswhicharecoveredbysubclassA23.
F6220ASSIGNMENTOFCOMPONENTS
TOCLEANLINESSCLASSES
Theequipmentspecification,inaccordancewiththerequirementsgivenbelow,shallspecifytowhichcleanlinessclassorsubclassacomponentorcomponentpartshallbeassigned.
ClassAcleanlinessshallapplytoallcomponentswhoseprocessfluidistheprimaryfluidorfluidinjectedintotheprimaryfluid*.
ClassBcleanlinessshallapplytoallcomponentswhoseprocessfluidis:
-waterorsteamforthesecondarysideofthenuclearboiler(exceptforrecirculation)
(1),
-waterfromthecomponentcoolingsystems,
-letdownofprimaryfluid(withoutre-injection)andliquid(stainlesssteelsurfaces)ornon-aeratedgaseouseffluents.
ClassCcleanlinessshallapplytoallcomponentswhoseprocessfluidisliquideffluent(surfacesotherthanstainlesssteel)oraeratedgaseouseffluent.
*SeedefinitiongiveninAnnexFI.
___________________________
(1)TheexternalsurfaceofsteamgeneratortubesinassignedtosubclassA22untilfabricationofthesteamgeneratorhasbeencompleted.
F6230WORKAREASREQUIRED
Throughoutthischapteraworkareashallbetakentomeanthesurroundingenvironmentintheimmediatevicinityofacomponentorcomponentpart(forexample,internalorexternalsurfaces).
ParagraphF6240definesthreelevelsofworkarea.TheyaredesignatedI,IIandIIIaccordingtodecreasingorderofseverityofrequirements.
LevelIworkareasarerequiredforsurfacesincontactwiththeprocessfluidsforsubclass
A21components.
LevelIIworkareasarerequiredforsurfacesincontactwiththeprocessfluidsforcomponentscoveredbysubclassesA1,A22andA23.
LevelIIIworkareasarerequiredforsurfacesincontactwithprocessfluidsforcomponentscoveredbycleanlinessclassesBandC.
However,fortheouterpartofsteamgeneratorstubebundles,levelIIworkareasarerequired.
Theconceptofworkareasshallonlybeapplicablesubsequenttoinitialcomponent(orcomponentpart)cleaningoperationsandtolateroperationswhichmayadverselyaffectcomponentcleanliness.Workareasmaybepermanentortemporaryandshallbeapplicabletofabricationshopsandconstructionsites.
Thesurroundingenvironmentintheimmediatevicinityofacomponentwhichisdesignatedasaworkareamay,asthecasemaybe,consistofanentirebuildingorworkshop,adelimitedareainsideashoporonaconstructionsite,orthewallofacomponentwithrespecttointernalsurfaceswhenadequatemeansofblankingoffthiswallareprovided.
F6240CHARACTERIZATIONOFWORKAREAS
F6241LEVELIWORKAREA
ThefollowingconditionsarerequiredforlevelIworkareas.
a)Enclosure
Aclosedorpressurizedenclosureshallbepermanentlyortemporarilyinstalledaroundcomponents.
Enclosuresshallprovideadequateprotectionagainstexternalcontaminationandanadequatedegreeofcleanliness.
b)Specialclothing
Personnelshallwearwhiteoverallswithnooutsidebuttons(zipfastenersshallbeusedwherepossible).Pocketsshallbecapableofbeingfastened100%closed.Personnelshallwearaheadcovering,lint-freewhiteglovesandcleanshoesorovershoes.
Visitorsmaybeadmittedtotheworkareaprovidedthattheywearwhiteoverallsorsmocksandovershoes(andwhitegloveswherethereismanualcontactwithcomponents).
c)Airfiltering
Themake-upairforpressurizedenclosuresshallbeclean,dryandfiltered.Theairshallbeblownthroughafilterwithanominalmeshsizelessthan20-30µ
m.
d)Accessforpersonnelandvisitors
Personnelshallhaveaccesstotheworkareathroughanair-lockoradjacentroomequippedwithchangingfacilities.Personnelshallchangeclothingonenteringorleavingtheworkarea.
e)Smoking,eatingorurinatingshallnotbeallowed.
f)Floors,wallsandceilings
Floorsshallbecoveredwithasmoothcoating(permanentandremovable).Iftheenclosureispermanentallwallsandceilingsshallnotproducedust.
g)Creationofdust
Machiningandallactivitiesleadingtothecreationofdustinsidetheenclosureshallbelimitedtothestrictminimum.Wheresuchactivityisunavoidable,asystemshallbeinstalledtocollectandevacuatedust.
h)Cleaningoffloors
Floorsshallbekeptcleanatalltimes:
whenaspecificactivityproducesunwantedmaterial,suchmaterialshallberemovedimmediately.
i)Mechanicalprotection
Adequatemechanicalprotectionshallbeprovidedtoprotectcomponentsagainstheavyfallingbodies.Suchprotectionismandatoryontheplantforreactorinternals.
F6242LEVELIIWORKAREA
ThefollowingconditionsarerequiredforlevelIIworkareas.
a)Specialclothing
Personnelshallwearcleanclothesandcleanshoesorovershoes.
b)Pollution
Everyprecautionshallbetakentolimittheriskofpollutionbythepersonnel(food-drinks-cigarettes,etc.)