Modelling II. Nozzle Inner Radius Examination Parameters D.E. MacDonald, Electric Power Research Institute, USA

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1 Modig II Nozz Ir Radius Examiatio Paramtrs D.E. MacDoad, Ectric Powr Rsarch Istitut, USA ABSTRACT It has b rcogizd for a og tim that th gomtry of ozz ir radius ispctio is so compx that th ispctios ca't b do without mathmatica modig. Th EPRI NDE Program spradsht mod has prov to b a powrfu ad vrsati too to addrss may diffrt ozz typs. Ractor prssur vss, stam grator, or prssurizr ozz ispctios coud ot b prformd, or v quaifid, without accurat mods of th ozz gomtry. Th mods producd ad opratd by EPRI hav abd th word wid ucar ft to mt its icsig commitmts to prform quaifid ozz ispctios. EPRI NDE Program staff has modd hudrds of ozzs for ispctio compais, utiitis, ad th quaificatio agcis. This papr wi documt quaifid ozz ir radius xamiatio paramtrs usig EPRI computr mods. Th papr wi provid pots of ir radius ispctio tchiqus (70/30bd, tc.) vrsus ozz gomtry charactristics (Rozz, Rbo, tc.). Ths pots ar basd o th data coctd as part of th o goig EPRI NDE Program projct "Pat-Spcific Appicatios of Quaifid Nozz Ir Radius ad Nozz-to-Sh Wd UT Procdurs Usig EPRI Computr Mods" [1]. BACKGROUND Nozz modig dfis th xamiatio paramtrs rquird (trasducr prob skw, sca surfac, radia positio ad mta path) to provid 100% covrag of th xamiatio voum whi miimizig th misoritatio ag at th faw. Th EPRI NDE Program dvopd a xact aaytica soutio (that is, th spradsht mod) to dvop utrasoic ispctio tchiqus ad to documt of xamiatio prformac [2]. Ractor prssur vss, stam grator, ad prssurizr ozz ispctios coud ot b prformd, or v quaifid, without accurat mods of th ozz gomtry. Th spradsht mods producd ad opratd by EPRI hav abd th wordwid ucar ft to mt its icsig commitmts to prform quaifid ozz ispctios [3-5]. A w fdra aw that wt ito ffct startig Novmbr 2002 rquird that a ractor vss ozzs must b ispctd usig procdurs that ar quaifid by prformac dmostratio accordig to th rquirmts of th ASME Cod Cas 552 [6, 7]. Ispctio srvics vdors d modig to dvop thir procdurs, th quaificatio agcy (Prformac Dmostratio Iitiativ (PDI)) ds modig i ordr to vauat ad tst th procdurs, ad th utiitis d modig to show that th quaifid procdurs wr appicab to th pats' spcific cofiguratios. NDE Program staff opratig th EPRI mods has providd modig srvics to ispctio compais, th utiitis, ad th quaificatio agcy (PDI). Th importac of mathmatica computr mods of ozz ispctio has icrasd with ozz quaificatios bcomig madatory i Novmbr Rvisios to 10CFR50.55a, iitiay pubishd Sptmbr 22, 1999, madat th impmtatio of th ASME Cod, Sctio XI, Divisio 1, Appdix VIII, Prformac Dmostratio for Utrasoic Examiatio Systms. Appdix VIII rquirs quaificatio of th procdurs, prso, ad quipmt usd to dtct ad siz faws i th isid corr rgio ad ozz-to-sh wds of ractor prssur vss ozz opigs [6]. 10CFR50.55a rquirs th us of ASME Cod Cas N-552 for ths quaificatios [7].

2 Listd bow ar thr of th procdurs that hav b quaifid to dat usig th EPRI 3D ozz mods: EPRI NDE Program Procdur, PDI-UT-11, Rvisio B, Gric Procdur for th Utrasoic Dtctio ad Sizig of Ractor Prssur Vss Nozz to Sh Wds ad Nozz Ir Radius Framatom Tchoogis Ic. Procdur, 54-ISI , Rvisio 3, Maua Utrasoic Examiatio of BWR Ractor Vss Nozz Ir Radius Rgios ad Nozz to Sh Wds (Ir 15%) WsDy Itratioa Procdur, ISI-PDI-210 MD, Rvisio 3, Maua Utrasoic Procdur for Examiatio of Nozz Ir Corr Radius Aras i Accordac with ASME Sctio XI, Icudig Appdix VIII Radrs shoud cotact th EPRI Prformac Dmostratio Iitiativ, to obtai accss to th atst rvisios of ths procdurs. INTRODUCTION A papr prstd at a arir cofrc i this sris [8] documts th ozz gomtris that hav b xamid usig th EPRI NDE Program Procdur, PDI-UT-11, Rvisio B [4]. As a xamp, Tab 1 ists th gomtry rags for a boiig watr ractor (BWR) ractor prssur vss (RPV) ozz that hav b xamid usig th EPRI NDE Program Procdur, PDI-UT-11 [1]. Utiity NDE staff hav usd this rport [1] to vauat if a quaifid UT procdur arady xists for th spcific ozz gomtry at thir sit. Th paramtrs i Tab 1 covr th BWR cor spray ozz ir radius (NIR) dtctio ad sizig xamiatios as w as th ozz-to-sh wd (NSW) xamiatios. Figur 1 shows th gomtric paramtrs, which dfi th cor spray ozz. Tab 1 - BWR Cor Spray Nozz Paramtrs for NIR ad NSW Examiatios Isid Surfac Dimsios Mi Max Outsid Surfac Dimsios Mi Max Wd Start R Wd Ed R Rbor Rozz Rbi Rbo Rvi Rvo

3 Figur 1 - Cross Sctio of Nozz Dfiig Gomtric Paramtrs for EPRI 3D Mods EMPIRICAL PARAMETER PHI (Φ) This papr iustrats a mpirica approach to dvopig ozz ir radius xamiatio paramtrs usig th xistig data bas of tchiqus quaifid with th assistac of th EPRI 3D mods [1]. Th papr provids pots of ir radius ispctio tchiqus (70/30bd, tc.) vrsus ozz gomtry charactristics (Rozz, Rbo, tc.). Th iustrativ xamp is rstrictd to th ispctio of th ir corr rgio of o-taprd ozzs. A mpirica paramtr Phi, Φ, was dvopd to prdict th bd prob skw ag for a prob bam ag of 70. Φ = Si-1{Rbor/(Rozz + Rbo)} Th ag Phi, Φ, is haf th subtdd ag for a obsrvr ookig at th ozz bor with radius, Rbor, from a vatag poit at th trasitio of th outr bd radius to th vss sh, Rozz + Rbo (s Figur 1). Figurs 2 through 4 show pots of th bd radius prob skw ag vrsus Phi for th cas of a prob bam ag of 70 for thr procdurs quaifid usig th EPRI 3D ozz mods. Th data usd for ths ispctio tchiqus vrsus ozz gomtry pots was coctd as part of th o goig EPRI projct Pat-Spcific Appicatios of Quaifid Nozz UT Procdurs Usig EPRI 3D Mods discussd arir [1].

4 35 Bd Skw Ag vrsus Phi Procdur 1 (BWR & PWR, Cass 1) Bam Ag 70 dg y = x R 2 = B d S k w A g Phi Figur 2 - Bd Prob Skw Ag vrsus Phi, Procdur 1, Prob Bam Ag = Bd Skw Ag vrsus Phi Procdur 2 (BWR & PWR) Bam Ag 70 dg y = x R 2 = B d S k w A g Phi Figur 3 - Bd Prob Skw Ag vrsus Phi, Procdur 2, Prob Bam Ag = 70

5 65.0 Bd Skw Ag vrsus Phi Procdur 3 (BWR & PWR) Bam Ag 70 dg y = x R 2 = B d S k w A g Phi Figur 4 - Bd Prob Skw Ag vrsus Phi, Procdur 3, Prob Bam Ag = 70 DISCUSSION A w EPRI NDE Program projct wi b proposd to ivstigat othr mpirica paramtrs that coud b usd to prdict xamiatio paramtrs usig th data bas of quaifid ozz ir radius ispctio mods [1].

6 REFERENCES 1) Nodstructiv Evauatio: Pat-Spcific Appicatios of Quaifid Nozz Ir Radius ad Nozz-to-Sh Wd Utrasoic Tstig Procdurs Usig EPRI Computr Mods: EPRI, Pao Ato, CA: ) Utrasoic Examiatio of Nozz Ir Radius Rgios TR , Pao Ato, EPRI, ) Dvopmt ad Quaificatio of Gric Nozz Isid Corr Rgio Examiatio Procdur , Pao Ato, EPRI, ) PDI Gric Procdur for th Utrasoic Dtctio ad Sizig of Ractor Prssur Vss Nozz-to-Sh Wds ad Nozz Ir Radius, PDI-UT-11, Nodstructiv Evauatio: Covtioa Nozz Ir Radius Gric Procdur ad Modig Procss (Appdix A) , Pao Ato, EPRI, ) Nodstructiv Evauatio: Covtioa Nozz Ir Radius Gric Procdur ad Modig Procss , Pao Ato, EPRI, ) ASME Boir & Prssur Vss Cod, Sctio XI, Appdix VIII, 1998 Editio with Addda through 2000 (as modifid by th PDI program dscriptio ad th Fdra Rgistr, Part II, Nucar Rguatory Commissio, 10 CFR Part 50, Idustry Cods ad Stadards; Amdd Rquirmts; Fia Ru, Datd 26 Sptmbr 2002), Nw York, Amrica Socity of Mchaica Egirs, ) ASME Boir & Prssur Vss Cod, Sctio XI, Cod Cas N-552 (Datd 12 Dcmbr 1995), Nw York, Amrica Socity of Mchaica Egirs, ) MacDoad D E, Pat-Spcific Appicatios of Quaifid Nozz UT Procdurs Utiizig EPRI 3D Mods, 6th It Cof o NDE i Ratio to Structura Itgrity for Nucar ad Prssurizd Compots, Budapst, Joit Rsarch Ctr of th Europa Commissio, 2007.