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{{#Wiki_filter: | {{#Wiki_filter:Stru ctures, sy stem s, and com po nent s of a nuclear pow er plant th at are designated as Seism ic Cate gory I are designed 1 to w iths ta nd the e f f ec ts of the s af e shut dow n e ar thqua k e (SS E) and re m ai n f unct iona l, se e Re g ula tory G uide 1.29,"S ei sm ic D es ig n Cl as si f ic at ion."A ppendi x S t o 10 C FR Part 50 a pplie s to a pplic ant s f or a de si g n c er tif ic at ion or c om bine d li ce nse purs uant to 2 10 CF R Par t 52, "Ea rly Sit e Perm its; St anda rd D es ig n Ce rti f ic at ions; a nd Com bine d L ic ens es f or N ucl ea r Pow er Plant s,"or a constru ction perm it or op erating license pu rsuant to 10 CFR P art 50 af ter Ja nu ary 10, 199 7. Howe ver, f or either an op era ti n g li cen se ap p li can t o r h o ld er who se co n st ru ct io n pe rmit w as i ssu ed be for e Jan u ary 10 , 1 9 9 7 , t h e ear th q u ake e n g i n e e r i n g c r i t e r i a i n S e c t i o n V I o f Ap p e n d i x A t o 1 0 C F R P a r t 1 0 0 c o n t i n u e t o a p p l y.T h e U.S. N u c le a r R e g u la to ry C o m m is s io n (N R C) i s s u e s re g u la to ry g u id e s to d e s c rib e a n d m a k e a v a il a b le to th e p u b li c m e th o d s th a t t h e N R C s ta ff con si der s acc ept abl e f or us e i n i m pl em ent i ng spe ci f i c par t s of t he age ncy's r egu l at i ons , t ech ni que s t hat t he st af f us es i n e val uat i ng spe ci f i c pr obl em s or po st ul at ed acc i den t s, an d d at a t hat t he st af f ne ed i n r evi ewi ng app l i cat i ons f or pe r m i t s and l i cen ses. Regul at or y gu i des ar e n ot s ubs t i t ut es f or r egu l at i ons , an d c om pl i anc e wi t h t hem i s not r equ i r ed. Met hod s and s ol ut i ons t hat di f f er f r om t hos e s et f or t h i n r egu l at or y gu i des wi l l be de em ed acc ept abl e i f t hey pr ovi de a b asi s f or t he f i ndi ngs r equ i r ed f or t he i ss uan ce or c ont i nua nce of a per m i t or l i cen se by t he C om m i ss i on.T hi s gui de was i ss ued af t er c ons i der at i on of c om m ent s r ece i ved f r om t he pub l i c. The N R C s t af f en cou r age s and wel com es com m ent s and s ugg est i ons in c o n n e c ti o n w it h i m p ro v e m e n ts to p u b li s h e d re g u la to ry g u id e s , a s w e ll a s i te m s fo r i n c lu s io n i n re g u la to ry g u id e s th a t a re c u rre n tl y b e in g d e v e lo p e d. T h e N R C s ta ff w il l re v is e e xis ti n g g u id e s , a s a p p ro p ria te , t o a c c o m m o d a te c o m m e n ts a n d to re fl e c t n e w i n fo rm a ti o n o r e xp e rie n c e. W rit te n c o m m e n ts m ay be s ubm i t t ed t o t he R ul es and D i r ect i ves Br anc h, O f f i ce of Adm i ni st r at i on, U.S. N ucl ear R egu l at or y C om m i ss i on, W ash i ngt on, D C 20 555-000 1.R egul at or y gui des ar e i ssued i n 10 br oad di vi si ons: 1, P ow er R eact or s; 2, R esear ch and T est R eact or s; 3, Fuel s and M at er i al s Faci l i t i es;4, Env i r on m en t al a nd Si t i ng; 5 , Ma t er i al s a nd Pl an t Pr ot ec t i on; 6 , Pr od uc t s; 7 , Tr an s po r t at i on; 8 , Occ up at i on al Hea l t h; 9 , Ant i t r us t a nd F i na nc i al Rev i ew;a n d 1 0 , G e n e ra l.R equ est s f or s i ngl e c opi es of dr af t or ac t i ve r egu l at or y gu i des (whi ch m ay be r epr odu ced) s hou l d b e m ade t o t he U.S. N ucl ear R egu l at or y C om m i ss i on, W ash i ngt on, D C 20 555 , At t ent i on: R epr odu ct i on and D i st r i but i on S er vi ces Sect i on, or by f ax t o (301) 41 5-228 9; or by em ai l t o D i st r i but i on@nr c.gov. E l ect r oni c cop i es of t hi s gui de and ot her r ece nt l y i ss ued gu i des ar e a vai l abl e t hr oug h t he N R C's pub l i c W eb si t e u nde r t he R egu l at or y G ui des do cum ent c o ll e c ti o n o f t h e N R C's E le c tro n ic R e a d in g R o o m a t ht t p://w w w.nr c.gov/r eadi ng-r m/doc-col l ect i ons/ a n d th ro u g h th e N R C's A g e n c yw id e D o c u m e n ts A c c e s s a n d M a n a g e m e n t S ys te m (A D A M S) a t h ttp://w w w.n rc.g o v/re a d in g-rm/a d a m s.h tm l, un der Acces si on N o. ML0702 600 29.U.S. N UC LEA R RE GU LA TO RY C OM MI SSIO N | ||
M ar ch 2007 R ev i si on 1 RE GUL AT ORY GUI DE OFFICE OF NUCL | |||
EA R REGULA TORY RESEA RCH R E G U LA TO R Y G U I D E 1.61 (D r af t w as i ssued as DG-1157, dat ed O ct ober 200 6)DA MPI NG VA L UE S F OR SE I SMI C D ES I GN O F N U C LE A R P O W E R P LA N TS A. INT ROD UC TIONThis reg ulatory g uide is bein g rev ised to up date th e g uidanc e for applican ts and licens ees reg arding the acceptab le dam ping v alues that the U.S. N uclear Reg ulatory C om m ission (NR C) staff use d in the seism ic resp onse analy sis of Seism ic C ateg ory I nu clear p owe r plan t structu res, sy stem s, 1 and com pone nts (S SC s) in accord ance with Title 10, Part 5 0, of the Cod e of Fede ral R egulatio ns (1 0 C F R P ar t 5 0), "D om es ti c L ic en si ng o f P ro du ct io n an d U ti li z at io n F ac il it ie s" [R ef. 1].Spec ifically , G eneral Desig n C riterion 2 , "Desig n B ases fo r Pro tection Ag ainst N atural P heno m ena,"of A ppen dix A , "Gen eral D esig n C riteria for Nuc lear P owe r Plan ts," to 10 C FR Pa rt 50 requires that SSC s im portant to safe ty be desig ned to w ithstand the effe cts of natural phen om ena such as ea rthquak es witho ut los ing the ability to perform their safety fun ctions. S uch SSC s m ust also be desig ned to a cc om m od at e th e ef fe ct s of a nd b e co m pa ti bl e w it h th e en v ir on m en ta l c on di ti on s as so ci at ed w it h norm al op eration and postula ted ac cidents. A ppen dix S , "Earthq uak e E ng ineering C riteria for Nuc lear Po we r Pl a nt s ," to 10 CFR Pa r t 50 sp e c i f i e s th e re qu i r e men t s fo r th e impl e men t a t i on of Ge ne r a l De s i gn Criterion 2 with respect to earth quak es.2 Rev. 1 of RG 1.61, Pa g e 2Thi s re g ul at or y g ui de s pe ci fi es th e da m pi ng v al ue s th at th e N R C s ta ff c on si de rs a cc ep ta bl e for co m ply ing w ith the ag ency's reg ulations and g uidanc e for seism ic ana ly sis. The sp ecified dam ping v alues are inte nded for elastic m odal dy nam ic seism ic ana ly sis w here energ y dissip ation is acco unted for by v is co us d am pi ng (i.e., th e da m pi ng f or ce is p ro po rt io na l t o th e v el oc it y).Thi s re g ul at or y g ui de c on ta in s in fo rm at io n co ll ec ti on s th at a re c ov er ed b y th e re qu ir em en ts of 1 0 C FR Pa rt 50, w hich the O ffice of Manag em ent an d B udg et (O MB) a pprov ed u nder OMB con trol num ber 3 150-0011. The NR C m ay neith er co nduc t nor spon sor, and a pe rson is no t requ ired to respo nd to, an in fo rm at io n co ll ec ti on r eq ue st o r re qu ir em en t u nl es s th e re qu es ti ng d oc um en t d is pl ay s a cu rr en tl y v al id O MB c on tr ol n um be r.B. DISC US SION Bac kgr oundD am pi ng is a m ea su re o f th e en er g y d is si pa ti on o f a m at er ia l o r st ru ct ur al s y st em a s it r es po nd s to dy nam ic exc itation. I t is a term use d to assist in m athem atically m odeling and solv ing dy nam ic equ ations of m ot io n fo r a v ib ra to ry s y st em in w hi ch e ne rg y is d is si pa te d. W he n pe rf or m in g a n el as ti c dy na m ic seism ic ana ly sis, one can accou nt for the en erg y dissip ated b y spe cify ing the am ount of v iscous dam ping (i.e., d am pi ng f or ce p ro po rt io na l t o th e v el oc it y) in th e an al y ti ca l m od el.C ur re nt N R C g ui da nc e on d am pi ng v al ue s to b e us ed in th e el as ti c de si g n of n uc le ar p ow er p la nt s is pres ented in this reg ulatory g uide, w hich was first issued in Octo ber 1 973 [Ref. 2]. L ik e the orig inal ver s i on of th i s gui de , t hi s re vis i on sp e c i f i e s eq ui val e nt vis c ou s m od a l da mpi ng val ue s as a p e r c e nt a ge of critical dam ping for Seism ic C ateg ory I SS Cs. H owe v er, the sta ff base d the orig inal d am ping v alues on li m it ed da ta , expe rt opin ion , and ot her inf ormati on avail abl e in 19 73. Sinc e tha t ti m e, th e NRC an d in du st ry h av e be en in v ol v ed in v ar io us s tu di es , r es ea rc h w or k , a nd te st in g to p re di ct a nd e st im at e dam ping v alues of S SC s. I n v iew of the av ailable d ata, the d am ping v alues prov ided in the orig inal v ersion of R eg ulatory G uide 1.6 1 m ay no t reflect realistic da m ping v alues for S SC s. A lso, it is rec og niz ed that ad ditional g uidanc e is neede d to address issue s, such as co rrelation betw een dam ping and structu res stress lev el, a nd dam ping v alues for m aterials n ot inc luded in the orig inal v ersion of R eg ulatory G uide 1.6 1 (e.g., e le ct ri ca l d is tr ib ut io n sy st em s an d re in fo rc ed m as on ry s tr uc tu re s).Ov er the past th ree d ecades , th e nu clear in dustry has pro posed dam ping v alues and discuss ed these v alues during v arious m eeting s an d rev iews of licen sing issue s. N uclear industry g roups and licensees ha v e su g g es te d th at th e N R C o ug ht to a cc ep t m or e re al is ti c da m pi ng v al ue s fo r se is m ic d es ig n an d an al y si s of S SC s, in pla ce o f the dam ping v alues prov ided in the orig inal R eg ulatory G uide 1.6 1.St r uc tu r al D am pingI n 1 993, the NR C com pleted an in v estig ation of the ade quacy of orig inal R eg ulatory G uide 1.6 1 structure dam ping v alues and other recom m endatio ns, and reported the results in N UR EG/CR-6011 [R ef. 3]. Data were analy z ed to iden tify the param eters tha t sig nificantly influe nced structure dam ping. Base d o n t ha t st ud y, t he NRC de t e r min e d t ha t th e or i gin a l Re gul a t or y Gui de 1.61 da mpi ng val ue s fo r st r uc t ur e de s i gn were adequ ate bu t requ ired o ne s ig nificant rev ision. S pecifically , R eg ulatory G uide 1.6 1 sh ould disting uish betw een "friction- bolted" and "be aring-bolted" con nection s for steel stru ctures. F riction-bolted conn ections a r e al s o r e f e r r e d t o a s "s l i p-cr i t i c a l" co nn e c t i on s. I n t he s e co nn e c t i on s , t he bo l t pr e l oa d i s hi gh e no ugh to e ns ur e th at f ri ct io n is n ot o v er co m e, a nd th e bo lt d oe s no t e xp er ie nc e sh ea r lo ad in g. R eg ul at or y Position 1 in S ection C of this rev ised g uide prov ides th e up dated structural dam ping v alues. | |||
Rev. 1 of RG 1.61, Pa g e 3 P iping Da m pingI n 1 986, the Am erican Society of Mechanica l En g ineers (AS ME) esta blished C ode Case N-411,"A l t e r n a t i ve Da mp i n g V a l u e s f o r Re s p o n s e Sp e c t r a An a l ys i s o f Cl a s s 1 , 2 , a n d 3 Pi p i n g," i n Se c t i o n I II , Div ision 1, of the A SME Boiler and Pressu re Vessel C | |||
ode [Ref. 4]. The NR C staff use d C ode Case N-411, with certain lim itations specified in R eg ulatory G uide 1.8 4 [R ef. 5], to rev iew operatin g reacto r issue s until C ode Case N-411 expired in 2000. The staff also app rov ed th e us e of alternate dam ping v alues for the G eneral Electric Adv anced B oiling Water R eactor Desig n in 1994 [R ef. 6], Com bustion En g ineering S y st em 8 0+ D es ig n in 1 99 2 [R ef. 7], a nd We st in g ho us e A P 60 0 D es ig n in 1 99 8 [R ef. 8]. R eg ul at or y Position 2 in S ection C of this rev ised g uide prov ides th e pip ing dam ping v alues that resu lted from the sta ff's exp erience with AS ME C ode Case N-411 and app lication rev iews of n ew reactor desig ns.Ele c tr ic al D ist r ibut ion Sys te m Da m pingReg ulatory G uide 1.6 1 d id no t orig inally pro v ide d am ping v alues for cab le tray or cond uit sy stem s. H is to ri ca ll y , th e nu cl ea r po w er in du st ry u se d th e da m pi ng v al ue s fo r bo lt ed s te el s tr uc tu re s fo r se is m ic de si g n of c ab le tr ay a nd c on du it s y st em s. I n th e la te 1 98 0s , h ow ev er , th e N R C s ta ff r ev ie w ed th e re su lt s of the cab le tray test at the Com anche Pe ak Stea m Ele ctrical S tation [R ef. 9]. R eg ulatory Po sition 3 in S ection C of this rev ised g uide prov ides th e da m ping v alues that resu lted from the staff's rev iew of d at a fr om th e C om an ch e P ea k te st [R ef. 1 0] a nd tw o sa fe ty e v al ua ti on r ep or ts [R ef s. 9 , 1 1].He at ing Ve nt ila ti on a nd A ir Co ndit ion ing Duc t D am pingThe dam ping v alues for he ating v entilation and air con ditioning (H VAC) sy stem s are consisten t with the g uidanc e pro v ided for bo lted stee l structu res. B ecause no tests of w elded duct constru ction ha v e be en id en ti fi ed , th e da m pi ng v al ue s ar e th e sa m e as f or w el de d st ee l s tr uc tu re s, a nd R eg ul at or y Posi ti on 4 in Se ct ion C of thi s re vised g uid e pro vides thes e same dam pin g values. I n addi ti on, th e NRC prov ides re lated in form ation on HVAC du ct dam ping in NU RE G/C R-6919 , "Reco m m endatio ns fo r R ev is io n of S ei sm ic D am pi ng Va lu es in R eg ul at or y G ui de 1.61" [R ef. 1 2].M e c hani c al a nd Ele c tr ic al C om pone nt Da m pingNU RE G/C R-6919 [R ef. 12] consid ers g uidanc e in Am erican Society of Civ il En g ineers (AS CE)Stand ard 4 3-05, "S eism ic D esig n C riteria for Structu res, Sy stem s, and Com pone nts in N uclear Facilities" | |||
[Ref. 13], a nd Non-Mandatory A ppen dix N , "Dy nam ic A naly sis Metho ds," to Section I I I , D iv ision 1, of the A SME Boiler & Pressu re Vessels Cod e [R ef. 14]. I n ad dition, N UR EG/CR-6919 [R ef. 12]prov ides re com m endatio ns a nd com m entary on dam ping v alues for (1) contain m ent stru ctures, contain m ent in ternal stru ctures, and othe r Se ism ic C ateg ory I structu res; (2) piping; (3) electrical distribution sy stem s (i.e., cable tray or cond uit sy stem s); (4) HVAC; and (5) m echan ical an d elec trical com pone nts. R eg ulatory Po sition 5 in Section C of this rev ised g uide prov ides th e da m ping v alues that resu lted from the staff's rev iew of this industry g uidanc e. | |||
Rev. 1 of RG 1.61, Pa g e 4 C. R EGU LAT ORY PO SITIONThe f ol lo w in g r eg ul at or y p os it io ns p ro v id e ac ce pt ab le d am pi ng v al ue s to b e us ed in th e el as ti c dy nam ic seism ic ana ly sis an d d esig n o f SS Cs, w here energ y dissip ation is app roxim ated b y v iscous dam ping unless otherw ise sp ecified. D am ping v alues hig her th an th ose prov ided m ay be used if doc um ented te st d at a su pp or t t he h ig he r v al ue s. D am pi ng v al ue s as so ci at ed w it h so il-st ru ct ur e in te ra ct io n an al y si s are n ot w ithin th e sco pe o f this reg ulatory g uide.1. | |||
St r uc tu r al D am ping 1.1 Acce ptab le Str uctu ral D amping V alues f or C onta inment Stru ctures, Con tainment Intern al S tructu res, and Other Seismic C atego ry I Str uctu res 1.1.1 Saf e-Shut down Ear thq uake (SSE)Table 1 prov ides a cceptab le dam ping v alues for the SS E a naly sis.Tab le 1. S SE D amping V alues St ru ct ur al M at er i al D ampi ng (% of C ri t i cal D am p i ng)Rei n f or ce d Conc r et e | |||
7%Rei n f or ce d M as on r y | |||
7%Pre s t r es s ed Conc r et e | |||
5%W el ded St ee l or B ol t ed St ee l w i t h Fr i ct i on Conn ec t i on s | |||
4%B ol t ed St ee l w i t h B ea r i n g Conn ec t i on s | |||
7%Note: | |||
For steel structures w ith a com bin ation of diff erent conn ection ty pes, use the lowe st specif ied dam pin g v alue, or as an alternative, use a "w eighted av erag e" dam pin g v alue based on th e num ber of e ach ty pe present in th e structure. | |||
Rev. 1 of RG 1.61, | 1.1.2 Oper ati ng-Basi s Eart hquak e (OBE)I f th e de si g n-ba si s O B E g ro un d ac ce le ra ti on is s el ec te d to b e le ss th an o r eq ua l t o on e-th ir d of th e de si g n-ba si s S S E g ro un d ac ce le ra ti on , th en a s ep ar at e O B E a na ly si s is n ot r eq ui re d. H ow ev er , if th e de si g n-ba si s O B E g ro un d ac ce le ra ti on is s el ec te d to b e g re at er th an o ne-th ir d of th e de si g n-ba si s S S E g ro un d ac ce le ra ti on , th en a s ep ar at e O B E a na ly si s sh ou ld b e co nd uc te d. Ta bl e 2 pr ov id es a cc ep ta bl e dam ping v alues for the O BE ana ly sis.Tab le 2. OBE D amping V alues St ru ct ur al M at er i al D ampi ng (% of C ri t i cal D am p i ng)Rei n f or ce d Conc r et e | ||
4%Rei n f or ce d M as on r y | |||
4%Pre s t r es s ed Conc r et e | |||
3%W el ded St ee l or B ol t ed St ee l w i t h Fr i ct i on Conn ec t i on s | |||
3%B ol t ed St ee l w i t h B ea r i n g Conn ec t i on s | |||
5% | |||
Rev. 1 of RG 1.61, Pa g e 5 1.2 Spe cial C onsid eration for In-S tructu re R espo nse Spe ctra Gen erationThe SS E d am ping v alues specified in Table 1 for linear d y nam ic ana ly sis of structures hav e be en s elected based on the expec tation th at the structural respon se attribu ted to load com bination s that inc lude SSE w ill be close to ap plicable code stress lim its, a s de fined in S ection 3.8 of NU RE G-0800[R ef. 1 5].How ev er, there m ay be cases whe re the predicted structu ral resp onse to loa d co m bination s that inc lude SSE is s ig nificantly belo w the ap plicable code stress lim its. Beca use equiv alent v iscous da m pi ng r at io s ha v e be en s ho w n to b e de pe nd en t o n th e st ru ct ur al r es po ns e le v el , it is n ec es sa ry to co nsider that the SS E d am ping v alues specified in Table 1 m ay be incons istent w ith the predicted st ru ct ur al r es po ns e le v el.For structural ev aluation, this is no t a c oncern , b ecause the stresses resulting from the use of d am ping-com patible structural respon se w ill still be less tha n the app licable c ode stress lim its, as d ef in ed in S ec ti on 3.8 of N U R E G-08 00 [R ef. 1 5].H ow ev er , f or in-st ru ct ur e re sp on se s pe ct ra g en er at io n, it is n ec es sa ry to u se th e da m pi ng-co m pa ti bl e structural respon se. C onseq uently , th e follo wing add itional g uidanc e is prov ided for an aly ses u sed to de term ine in-structure respon se sp ectra: (1) | |||
U se th e O B E d am pi ng v al ue s sp ec if ie d in Ta bl e 2, w hi ch a re a cc ep ta bl e to th e st af f wit hout fur the r re view.(2) | |||
Sub m it a p lant-specific technica l basis for us e of dam ping v alues hig her th an th e O BE dam ping v alues specified in Table 2 , b ut no t g reater tha n the SS E d am ping v alues specified in Table 1 (e.g., see N UR EG/CR-6919 , S ection 3.2.3), sub j ect to staff rev iew on a cas e-by-case basis.I n g en er al , f or c er ti fi ed s ta nd ar d pl an t d es ig ns w he re th e de si g n-ba si s in-st ru ct ur e re sp on se s pe ct ra represen t the env elope of the in-structure respon ses o btained from m ultiple a naly ses co nduc ted to c on si de r a ra ng e of e xp ec te d si te s oi l c on di ti on s, it is n ot n ec es sa ry f or c om bi ne d li ce ns e ap pl ic an ts to ad dress this issu e. H owe v er, if plan t-specific seism ic ana ly ses are con ducted for Categ ory I structu res and/or structures not in cluded as part o f the standard plan t desig n, then the ap plicant is exp ected t o a dd r e s s th i s is s ue ac c or di ngl y. | |||
Rev. 1 of RG 1.61, Pa g e 6 2. | |||
P iping Da m pingTable 3 presents the constan t dam ping v alues specified for S SE and OB E (w here required)analy ses o f pipin g sy stem s. These v alues are ap plicable to tim e-history , re spon se sp ectra, and equiv alent s tatic ana ly sis pro cedure s for structural qualification | |||
.T ab le 3. D am p in g V al u es for Pip in g S ys te ms C ategory D ampi ng V al ue S S EO B E > S S E/3 Pi pi n g S y s t e ms 4%3%As an a lternativ e for respon se sp ectrum ana ly ses u sing an env elope of the SS E o r O BE respo nse spe ct ra at al l su ppor t poi nts (uni for m suppo rt m oti on), fre que ncy-dep end ent dam pin g values shown in F ig ure 1 m ay be used, sub j ect to the fo llowin g restriction s:* | |||
Frequ ency-depen dent dam ping sho uld b e us ed c om pletely and con sistently , if at all. (Dam ping v alues specified in R eg ulatory G uide 1.6 1 are to be u sed for eq uipm ent other than piping.)* | |||
Use of the spe cified d am ping v alues is lim ited o nly to respon se sp ectral an aly ses. Acce ptance of the use of the sp ecified dam ping v alues with other ty pes of d y nam ic ana ly ses (e.g., tim e-history ana ly ses o r inde pend ent su pport m otion m ethod) requires further j ustification. | |||
* | |||
When used for reco nciliation or su pport optim iz ation of ex isting des ig ns, the effe cts of increased m otion on existing clearan ces a nd online m ounted equ ipm ent sh ould be c heck ed.* | |||
Frequ ency-depen dent dam ping is n ot ap propriate for an aly z ing the dy nam ic resp onse of p iping s yst e ms us i ng s up po r t s de s i gne d t o d i s s i pa t e en e r gy by yi e l di ng.* | |||
4% | Frequ ency-depen dent dam ping is n ot ap plicable to pip ing in whic h stres s co rrosion crack ing ha s oc cu rr ed , u nl es s a ca se-sp ec if ic e v al ua ti on is p ro v id ed a nd r ev ie w ed a nd f ou nd a cc ep ta bl e by th e N R C s ta ff. | ||
3% | |||
Use the | |||
Rev. 1 of RG 1.61, | Rev. 1 of RG 1.61, Pa g e 7 3. | ||
Ele c tr ic al D ist r ibut ion Sys te m Da m pingTable 4 presents the constan t dam ping v alues specified for S SE and OB E (w here required)an al y se s of c ab le tr ay a nd c on du it s y st em s. Th es e v al ue s ar e ap pl ic ab le to r es po ns e sp ec tr a and equiv alent s tatic ana ly sis pro cedure s for structural qualification. The dam ping v alues specified in Table 4 are applicab le to all ty pes of su pports, inclu ding w elded supp orts. The us e of hig her d am ping val ue s fo r ca bl e tr a ys wi t h f l e xi bl e su pp or t sys t e ms (e.g., r od-hu ng t r a pe ze s yst e ms, st r ut-hu ng t r a pe ze sy st em s, a nd s tr ut-ty pe c an ti le v er a nd b ra ce d ca nt il ev er s up po rt s y st em s) is p er m is si bl e, s ub ject to obtainin g N RC rev iew for acc eptance on a case-by-case basis.The analy sis m ethodo log y sho uld c onside r the flexibility of supp orts in determ ining the sy stem respon se to seism ic exc itation. | |||
Rev. 1 of RG 1.61, | Rev. 1 of RG 1.61, Pa g e 8 T ab le 4. D am p in g V al u es for E le ct ri ca l D is tr ib u ti on S ys te ms C ategory D ampi ng V al ue S S EO B E > S S E/3 C abl e Tray Syst em 4 M axi m um C ab l e Lo ad i ng 1 E m p ty 2 Spray ed-on Fi r e Ret ar dant or ot her ca b l e-restraini ng m ec ha nism 3 10%7%7%7%5%5%C on du i t S ys t e ms 4 M a x im u m C a b le fi ll 1 E m p ty 2 7%5%5%3%Notes: 1. | ||
Maxim um ca ble load ings, in accordance w ith th e plant design specif ication , are to be utilized in con jun ction w ith th ese dam pin g v alues.2. | |||
Spa re c abl e tra y a nd c onduit, ini tia lly e m pty , m ay be a nal y ze d w ith ze ro c abl e loa d a nd the se da m ping v al ues. (Not e: R e-ana ly si s is e x pec te d w hen put i nto s er v ic e.)3. | |||
Res tr ai n t o f th e free re la ti ve m o vement of th e cab le s in si d e a tr ay red u ces t h e system dampi n g.4. | |||
W hen ca ble loa ding s of le ss-tha n m ax im um a re s pec if ie d f or de si g n c al cul at ions , t he appl ic ant or licensee is e xpected to justify the selec ted dam pin g v alues and ob tain NRC rev iew f or acce ptan ce on a c ase-by-case basis.4. | |||
He at ing , V e nt ila ti on, and A ir Co ndit ion ing Duc t D am pingTable 5 presents the constan t dam ping v alues specified for S SE and OB E (w hen required)analy ses o f H VAC duct sy stem s. These v alues are ap plicable to resp onse spectra and equiv alent static an aly sis pro cedure s for structural qualification | |||
.The analy sis m ethodo log y m ust co nsider the flex ibility of supp orts in determ ining sy stem respon se to seism ic exc itation.T ab le 5. D am p in g V al u es for HV A C D u ct S ys te ms Type of D uc t C ons t ru ct i on D ampi ng V al ue S S EO B E > S S E/3 Pock et Loc k10%7%Compan i on An g l e7%5%W el ded4%3% | |||
Rev. 1 of RG 1.61, Pa g e 9 5. | |||
M e c hani c al a nd Ele c tr ic al C om pone nt Da m pingTab le 6 p re se nt s th e da m pi ng v al ue s fo r m ec ha ni ca l a nd e le ct ri ca l c om po ne nt s, w hi ch a re ap pl ic ab le to p as si v e su bc om po ne nt s th at c an b e se is m ic al ly q ua li fi ed b y a na ly si s. A ct iv e su bc om po ne nt s do n ot r ea di ly le nd th em se lv es to s ei sm ic q ua li fi ca ti on b y a na ly si s, a nd r eq ui re q ua li fi ca ti on b y te st , as d es cr ib ed in S ec ti on 3.10 o f N U R E G-08 00 [R ef. 1 5].T ab le 6. D am p in g V al u es for Me ch an ic al a n d E le ct ri ca l C om p on en ts C ompone nt Type D ampi ng V al ue S S EO B E > S S E/3 M o t o r, Fan, and C | |||
o m p res sor H o usi ngs (p ro te c tio n , stru c tur a l sup p o rt)3%2%P ressu re V esse l s, H ea t E xc ha ng ers, an d P um p an d V alve B o d i es (p re ssu re b o u n d a ry)3%2%W el d ed Ins t rume nt R acks (s tru c tur a l sup p o rt)3%2%El ec t r i ca l Cabi n et s , Pan el s , a n d M ot or C o ntro l C en t ers (M C C s)(p ro te c tio n , stru c tur a l sup p o rt)3%2%M et al A t m o spheri c Storage T | |||
anks (contai nm ent , pro t ect i o n) - I mpu l s i v e M ode - Sl os h i n g M ode 3%0.5%2%0.5% | |||
Rev. 1 of RG 1.61, Pa g e 10 D. IMP LEM ENT ATIONThe purp ose of this section is to prov ide in form ation to ap plicants and licensees reg arding th e N R C s ta ff's p la ns f or u si ng th is r eg ul at or y g ui de. N o ba ck fi tt in g is in te nd ed o r ap pr ov ed in conn ection with the issu ance of this g uide.Exce pt in those cases in w hich an a pplican t or licensee propo ses o r has prev iously estab lished an a cceptab le alterna tiv e m ethod for co m ply ing w ith sp ecified portion s of the N RC's reg ulations, th e N R C s ta ff w il l u se th e m et ho ds d es cr ib ed in th is g ui de to e v al ua te (1) s ub m it ta ls in c on ne ct io n w it h applicatio ns fo r con struction perm its, sta ndard plan t desig n ce rtifications, op erating licens es, early site perm its, a nd com bined licenses; | |||
and (2) su bm ittals from op erating reacto r license es who v oluntarily pro pose to initiate sy stem m odification s if th ere is a clear nexu s be tween the propo sed m odification s an d the sub j ect for whic h g uidanc e is prov ided herein.R EG U LA TO R Y A N A LY SI S / B A C KF IT A N A LY SI SThe r eg ul at or y a na ly si s an d ba ck fi t a na ly si s fo r th is r eg ul at or y g ui de a re a v ai la bl e in Draft Reg ulatory G uide DG-1157 , "Dam ping Values for S eism ic D esig n o f N uclear Pow er P lants"(R ef. 1 6). Th e N R C is su ed D G-11 57 in O ct ob er 2 00 6 to s ol ic it p ub li c co m m en t o n th e dr af t o f th is Rev ision 1 o f R eg ulatory G uide 1.6 1. | |||
A ll NR C r eg ula tions li st ed her ei n a re a v ai la ble e le ct ronic al ly thr oug h the El ec troni c Re adi ng Room on t he NR C's 3 public W eb si te , a t http://w w w.nrc.g ov/re adi ng-r m/doc-c olle ct ions/c f r/pa rt050. C opie s ar e al so av ai la ble f or i nspe ct ion or c opy ing f or a f ee f rom the N RC's Public D ocum ent Room a t 11555 Roc k v ill e Pike , R ock v ill e, MD; t he PDR's m ai ling a ddre ss is U SN RC PDR, W as hing ton, DC 20555; te le phone (301) 415-4737 or (800) 397-4209; f ax (301)415-3548; | |||
em ai l PDR@nrc.g ov.A ll re g ula tory g uide s lis te d he re in w er e publis hed by the U.S. Nuc le ar Re g ula tory Com m is si on or its pre dec es sor , 4 the U.S. A tom ic Ene rg y Com m is si on. M ost a re a v ai la ble e le ct ronic al ly thr oug h the El ec troni c Re adi ng Room on the N RC's publi c W eb si te , a t http://ww w.nrc.gov/readin g-rm/do c-collection s/reg-g uid es/. S ing le c opie s of re g ula tory g uide s m ay a ls o be obta ine d f re e of c har g e by w rit ing the Re produc tion and Di st ribut ion Se rv ic es Se ct ion, A DM, U SN RC , W as hing ton, DC 20555-0001, by f ax to (301) 415-2289, or by e m ai l t o DI ST RI BU T IO N@nrc.g ov. A ct iv e g uide s m ay a ls o be purc has ed f rom the N at iona l T ec hnic al Inf orm at ion Se rv ic e (N T IS). D et ai ls m ay be obta ine d by c onta ct ing N T IS at 5285 Port R | |||
oy al Roa d, Spr ing f ie ld, Virg inia 22161, onl ine a t http://w w w.nti s.g ov , by te le phone at (800) 553-N T IS (6847) or (703) 605-6000, or by f ax to (703) 605-6900. | |||
C opie s ar e al so av ai la ble f or ins pec tion or c opy ing f or a f ee f rom the N RC's Public D ocum ent Room (PDR), w hic h is loc at ed at 11555 R ock v ill e P ike, Rock ville, Mary land; the P DR's m ailing address is USNRC | |||
P DR, W ashington , DC 205 55-00 01. T he P DR ca n a ls o be re ac hed by te le phone at (301) 415-4737 or (800) 397-4209, by f ax a t (301) 415-3548, a nd by e m ai l to PDR@nrc.g ov.A ll NU RE G-s er ie s re ports li st ed her ei n w er e publis hed by the U.S. Nuc le ar Re g ula tory Com m is si on. C opie s ar e 5 ava ilable f or in spection or copying f or a f ee f rom the NRC's Pu blic Docume nt Ro om at 115 55 Rockv ille P ike, Roc k v ill e, MD; t he PDR's m ai ling a ddre ss is U SN RC PDR, W as hing ton, DC 20555; te le phone (301) 415-4737 or (800) 397-4209; f ax (301) 415-3548; | |||
e m ai l PDR@nrc.g ov. C opie s ar e al so av ai la ble a t c urr ent ra te s f rom the U.S. G ov er nm ent Printi ng O f f ic e, P.O. Box 37082, W as hing ton, DC 20402-9328, te le phone (202) 512-1800; | |||
or f rom the N at iona l T ec hnic al Inf orm at ion Se rv ic e (N T IS) a t 5285 Port Roy al Roa d, Spr ing f ie ld, Virg inia 22161, online a t http://w w w.nti s.g ov, by te le phone at (800) 553-N T IS (6847) or (703) 605-6000, or by f ax to (703) 605-6900. | |||
NU RE G-0800 a nd N UR EG/C R-6919 a re a ls o a v ai la ble e le ct ronic al ly thr oug h the El ec troni c Re adi ng Room on the N RC's publi c W eb si te , a t http://ww w.nrc.gov/ reading-rm | |||
/do c-collection s/nu regs/.Cop ies m ay be obt ained from the A m erican Society of Mechanical Engineers, T | |||
hree P ark A venue, New York, NY 6 10016-5990. | |||
Phone (212)591-8500; f ax (212)591-8501; | |||
w w w.a sm e.org.Rev. 1 of RG 1.61, Pa g e 11 REF ERE NC ES 1. | |||
U.S. | U.S. Cod e of Fede ral R egulatio ns , Title 10 , P art 50 , "Dom estic L icensing of Prod uction and Util izat ion Faci li ti es," U.S. Nucl ear Regulat ory Com m is si on, W ash ingto n, DC.3 2. | ||
Reg ulatory G uide 1.6 1, "Dam ping Values for S eism ic D esig n o f N uclear Pow er P lants,"U.S. Atom ic E nerg y C om m ission, Washin g ton, DC , O ctober 1973.4 3. | |||
NU RE G/C R-6011 , "Rev iew of S tructure Dam ping Values for E lastic S eism ic A naly sis of Nuc lear P owe r Plan ts," U.S. Nuc lear R eg ulatory C om m ission, Washin g ton, DC , March 19 93.5 4. | |||
" | "AS ME B oiler an d P ressure Vessel C ode, C ode Case N-411-1, Alterna tiv e D am ping Values for R espon se S pectra Ana ly sis of Class 1, 2 an d 3 Pip ing ," Section I I I , D iv ision 1, Am erican Society of Mechanica l En g ineers, N ew York , N ew York , F ebruary 20 , 1 986.6 5. | ||
Re gul a t or y Gui de 1.84 , "De s i gn, Fa br i c a t i on , a nd Ma t e r i a l s Co de Ca s e Ac c e pt a bi l i t y -ASME Se ct ion I I I ," U.S. Nucl ear Regulat ory Com m is si on, W ash ingto n, DC.3 6. | |||
NU RE G-1503 , "Final Safety Ev aluation Rep ort R elated to the C ertification of the A dv anced Boilin g-Water R eactor," U.S. N uclear Reg ulatory C om m ission, Washin g ton, DC , July 19 94.4 Cop ies a re av ailable f or in spection or copying f or a f ee f rom the NRC's Pu blic Docume nt Ro om at 115 55 Rockv ille P ike, 7 Roc k v ill e, MD; t he PDR's m ai ling a ddre ss is U SN RC PDR, W as hing ton, DC 20555 (te le phone: 301-415-4737 or 800-397-4209; | |||
f ax: 301-415-3548; e m ai l: PDR@nrc.g ov).Cop ies m ay be purch ased f rom the A m erican Society f or Civil Engineers (A | |||
SCE), 1 80 1 A lexa nd er Be ll Drive, 8 Re st on, VA 20190 [phone: (800) 548-A SCE (2723)]. Purcha se inf orm at ion i s av ai la ble thr oug h the A SCE W eb si te at http://w w w.pubs.a sc e.org.Dr af t R eg ula tory G uide D G-1157 i s av ai la ble e le ct ronic al ly unde r A cc es si on #ML 062680189 in the N RC's 9 A g enc y w ide D ocum ent s A cc es s and Ma nag em ent Sy st em (A DA MS) a t ht tp://w w w.nrc.g ov/re adi ng-r m/a dam s.htm l. Copi es a re a ls o a v ai la ble f or i nspe ct ion or c opy ing f or a f ee f rom the N RC's Public D ocum ent Room (PDR), w hic h is located at 115 | |||
55 Rockv ille P ike, Rock ville Mary land; the P DR's m ailing address is USNRC | |||
P DR, W ashington , DC 20 55 5-0 00 1. The PDR can also be reac hed b y telepho ne at (301) 415-47 37 or (80 0) 39 7-4 20 9 by f ax at (301) 415-3548, a nd by e m ai l t o PDR@nrc.g ov.Rev. 1 of RG 1.61, Pa g e 12 7. | |||
NU RE G-1462 , "Draft Safety Ev aluation Rep ort related to the D esig n C ertification of the Sy stem 80+Desig n," U.S. Nuc lear R eg ulatory C om m ission, Washin g ton, DC , S eptem ber 1 992.4 8. | |||
N U R E G-15 12 , "F in al S af et y E v al ua ti on R ep or t r el at ed to C er ti fi ca ti on o f th e A P 60 0 S ta nd ar d Desig n," U.S. Nuc lear R eg ulatory C om m ission, Washin g ton, DC , S eptem ber 1 998.4 9. | |||
NU RE G-0797 , "Safety Ev aluation Rep ort R elated to the O peration of Com anche Pe ak Stea m Electric Station, U nits 1 and 2," S upplem ent N o. 16, U.S. N uclear Reg ulatory C om m ission, Washing ton, DC , July 19 88.4 10. | |||
Ware, A.G., | Ware, A.G., a nd C.B. Slau g hterbeck , "A Surv ey of Cab le Tray and C ondu it Da m ping R esearch,"I daho N ational Eng ineering La boratory , R eport No. EG G-EA-7346 , R ev. 1 , p repared for the U.S. N uclear Reg ulatory C om m ission, Washin g ton, DC , A ug ust 1 986.7 11. | ||
NU RE G-0847 , "Safety Ev aluation Rep ort for Watts B ar N uclear Plant, U nits 1 and 2,"Sup plem ent N o. 8, U.S. Nuc lear R eg ulatory C om m ission, Washin g ton, DC , January 19 92.4 12. | |||
N U R E G/C R-69 19 , "R ec om m en da ti on s fo r R ev is io n of S ei sm ic D am pi ng Va lu es f or th e S ei sm ic Dam ping Values in R eg ulatory G uide 1.6 1," U.S. Nuc lear R eg ulatory C om m ission, Washin g ton, DC , N ov em ber 2 006.4 13. | |||
A m er ic an S oc ie ty o f C iv il E ng in ee rs , A S C E S ta nd ar d 43-05 , "S ei sm ic D es ig n C ri te ri a for S tructures, Sy stem s, and Com pone nts in N uclear Facilities," R eston, VA, 20 05.8 1 4. | |||
A me r i c a n So c i e t y o f M e c h a n i c a l En gi n e e r s , "B o i l e r a n d Pr e s s u r e V e s s e l Co d e ," Se c t i o n I II , Di vis i on 1, Non-M a nd a t or y App e nd i x N, "D yna mic Ana l ysi s Me t ho ds ," Ne w Yo r k, Ne w Yo r k, 2004.5 15. | |||
NU RE G-0800 , "Stand ard R ev iew Plan for the R ev iew of S afety A naly sis R eports for N uclear Power Plan ts ," U.S. Nucl ear Regulat ory Com m is si on, W ash ingto n, DC.4 16. | |||
Draft | Draft Reg ulatory G uide DG-1157 , "Dam ping Values for S eism ic D esig n o f N uclear Pow er Pla nts ," U.S. Nucl ear Regulat ory Com m is si on, W ash ingto n, DC.9}} | ||
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Revision as of 07:21, 31 August 2018
| ML070260029 | |
| Person / Time | |
|---|---|
| Issue date: | 03/12/2007 |
| From: | NRC/RES/DFERR/DDERA/MSEB |
| To: | |
| Graves HL (301)415-5880 | |
| Shared Package | |
| ML070260020 | List: |
| References | |
| DG-1157 RG-1.061, Rev. 1 | |
| Download: ML070260029 (12) | |
Stru ctures, sy stem s, and com po nent s of a nuclear pow er plant th at are designated as Seism ic Cate gory I are designed 1 to w iths ta nd the e f f ec ts of the s af e shut dow n e ar thqua k e (SS E) and re m ai n f unct iona l, se e Re g ula tory G uide 1.29,"S ei sm ic D es ig n Cl as si f ic at ion."A ppendi x S t o 10 C FR Part 50 a pplie s to a pplic ant s f or a de si g n c er tif ic at ion or c om bine d li ce nse purs uant to 2 10 CF R Par t 52, "Ea rly Sit e Perm its; St anda rd D es ig n Ce rti f ic at ions; a nd Com bine d L ic ens es f or N ucl ea r Pow er Plant s,"or a constru ction perm it or op erating license pu rsuant to 10 CFR P art 50 af ter Ja nu ary 10, 199 7. Howe ver, f or either an op era ti n g li cen se ap p li can t o r h o ld er who se co n st ru ct io n pe rmit w as i ssu ed be for e Jan u ary 10 , 1 9 9 7 , t h e ear th q u ake e n g i n e e r i n g c r i t e r i a i n S e c t i o n V I o f Ap p e n d i x A t o 1 0 C F R P a r t 1 0 0 c o n t i n u e t o a p p l y.T h e U.S. N u c le a r R e g u la to ry C o m m is s io n (N R C) i s s u e s re g u la to ry g u id e s to d e s c rib e a n d m a k e a v a il a b le to th e p u b li c m e th o d s th a t t h e N R C s ta ff con si der s acc ept abl e f or us e i n i m pl em ent i ng spe ci f i c par t s of t he age ncy's r egu l at i ons , t ech ni que s t hat t he st af f us es i n e val uat i ng spe ci f i c pr obl em s or po st ul at ed acc i den t s, an d d at a t hat t he st af f ne ed i n r evi ewi ng app l i cat i ons f or pe r m i t s and l i cen ses. Regul at or y gu i des ar e n ot s ubs t i t ut es f or r egu l at i ons , an d c om pl i anc e wi t h t hem i s not r equ i r ed. Met hod s and s ol ut i ons t hat di f f er f r om t hos e s et f or t h i n r egu l at or y gu i des wi l l be de em ed acc ept abl e i f t hey pr ovi de a b asi s f or t he f i ndi ngs r equ i r ed f or t he i ss uan ce or c ont i nua nce of a per m i t or l i cen se by t he C om m i ss i on.T hi s gui de was i ss ued af t er c ons i der at i on of c om m ent s r ece i ved f r om t he pub l i c. The N R C s t af f en cou r age s and wel com es com m ent s and s ugg est i ons in c o n n e c ti o n w it h i m p ro v e m e n ts to p u b li s h e d re g u la to ry g u id e s , a s w e ll a s i te m s fo r i n c lu s io n i n re g u la to ry g u id e s th a t a re c u rre n tl y b e in g d e v e lo p e d. T h e N R C s ta ff w il l re v is e e xis ti n g g u id e s , a s a p p ro p ria te , t o a c c o m m o d a te c o m m e n ts a n d to re fl e c t n e w i n fo rm a ti o n o r e xp e rie n c e. W rit te n c o m m e n ts m ay be s ubm i t t ed t o t he R ul es and D i r ect i ves Br anc h, O f f i ce of Adm i ni st r at i on, U.S. N ucl ear R egu l at or y C om m i ss i on, W ash i ngt on, D C 20 555-000 1.R egul at or y gui des ar e i ssued i n 10 br oad di vi si ons: 1, P ow er R eact or s; 2, R esear ch and T est R eact or s; 3, Fuel s and M at er i al s Faci l i t i es;4, Env i r on m en t al a nd Si t i ng; 5 , Ma t er i al s a nd Pl an t Pr ot ec t i on; 6 , Pr od uc t s; 7 , Tr an s po r t at i on; 8 , Occ up at i on al Hea l t h; 9 , Ant i t r us t a nd F i na nc i al Rev i ew;a n d 1 0 , G e n e ra l.R equ est s f or s i ngl e c opi es of dr af t or ac t i ve r egu l at or y gu i des (whi ch m ay be r epr odu ced) s hou l d b e m ade t o t he U.S. N ucl ear R egu l at or y C om m i ss i on, W ash i ngt on, D C 20 555 , At t ent i on: R epr odu ct i on and D i st r i but i on S er vi ces Sect i on, or by f ax t o (301) 41 5-228 9; or by em ai l t o D i st r i but i on@nr c.gov. E l ect r oni c cop i es of t hi s gui de and ot her r ece nt l y i ss ued gu i des ar e a vai l abl e t hr oug h t he N R C's pub l i c W eb si t e u nde r t he R egu l at or y G ui des do cum ent c o ll e c ti o n o f t h e N R C's E le c tro n ic R e a d in g R o o m a t ht t p://w w w.nr c.gov/r eadi ng-r m/doc-col l ect i ons/ a n d th ro u g h th e N R C's A g e n c yw id e D o c u m e n ts A c c e s s a n d M a n a g e m e n t S ys te m (A D A M S) a t h ttp://w w w.n rc.g o v/re a d in g-rm/a d a m s.h tm l, un der Acces si on N o. ML0702 600 29.U.S. N UC LEA R RE GU LA TO RY C OM MI SSIO N
M ar ch 2007 R ev i si on 1 RE GUL AT ORY GUI DE OFFICE OF NUCL
EA R REGULA TORY RESEA RCH R E G U LA TO R Y G U I D E 1.61 (D r af t w as i ssued as DG-1157, dat ed O ct ober 200 6)DA MPI NG VA L UE S F OR SE I SMI C D ES I GN O F N U C LE A R P O W E R P LA N TS A. INT ROD UC TIONThis reg ulatory g uide is bein g rev ised to up date th e g uidanc e for applican ts and licens ees reg arding the acceptab le dam ping v alues that the U.S. N uclear Reg ulatory C om m ission (NR C) staff use d in the seism ic resp onse analy sis of Seism ic C ateg ory I nu clear p owe r plan t structu res, sy stem s, 1 and com pone nts (S SC s) in accord ance with Title 10, Part 5 0, of the Cod e of Fede ral R egulatio ns (1 0 C F R P ar t 5 0), "D om es ti c L ic en si ng o f P ro du ct io n an d U ti li z at io n F ac il it ie s" [R ef. 1].Spec ifically , G eneral Desig n C riterion 2 , "Desig n B ases fo r Pro tection Ag ainst N atural P heno m ena,"of A ppen dix A , "Gen eral D esig n C riteria for Nuc lear P owe r Plan ts," to 10 C FR Pa rt 50 requires that SSC s im portant to safe ty be desig ned to w ithstand the effe cts of natural phen om ena such as ea rthquak es witho ut los ing the ability to perform their safety fun ctions. S uch SSC s m ust also be desig ned to a cc om m od at e th e ef fe ct s of a nd b e co m pa ti bl e w it h th e en v ir on m en ta l c on di ti on s as so ci at ed w it h norm al op eration and postula ted ac cidents. A ppen dix S , "Earthq uak e E ng ineering C riteria for Nuc lear Po we r Pl a nt s ," to 10 CFR Pa r t 50 sp e c i f i e s th e re qu i r e men t s fo r th e impl e men t a t i on of Ge ne r a l De s i gn Criterion 2 with respect to earth quak es.2 Rev. 1 of RG 1.61, Pa g e 2Thi s re g ul at or y g ui de s pe ci fi es th e da m pi ng v al ue s th at th e N R C s ta ff c on si de rs a cc ep ta bl e for co m ply ing w ith the ag ency's reg ulations and g uidanc e for seism ic ana ly sis. The sp ecified dam ping v alues are inte nded for elastic m odal dy nam ic seism ic ana ly sis w here energ y dissip ation is acco unted for by v is co us d am pi ng (i.e., th e da m pi ng f or ce is p ro po rt io na l t o th e v el oc it y).Thi s re g ul at or y g ui de c on ta in s in fo rm at io n co ll ec ti on s th at a re c ov er ed b y th e re qu ir em en ts of 1 0 C FR Pa rt 50, w hich the O ffice of Manag em ent an d B udg et (O MB) a pprov ed u nder OMB con trol num ber 3 150-0011. The NR C m ay neith er co nduc t nor spon sor, and a pe rson is no t requ ired to respo nd to, an in fo rm at io n co ll ec ti on r eq ue st o r re qu ir em en t u nl es s th e re qu es ti ng d oc um en t d is pl ay s a cu rr en tl y v al id O MB c on tr ol n um be r.B. DISC US SION Bac kgr oundD am pi ng is a m ea su re o f th e en er g y d is si pa ti on o f a m at er ia l o r st ru ct ur al s y st em a s it r es po nd s to dy nam ic exc itation. I t is a term use d to assist in m athem atically m odeling and solv ing dy nam ic equ ations of m ot io n fo r a v ib ra to ry s y st em in w hi ch e ne rg y is d is si pa te d. W he n pe rf or m in g a n el as ti c dy na m ic seism ic ana ly sis, one can accou nt for the en erg y dissip ated b y spe cify ing the am ount of v iscous dam ping (i.e., d am pi ng f or ce p ro po rt io na l t o th e v el oc it y) in th e an al y ti ca l m od el.C ur re nt N R C g ui da nc e on d am pi ng v al ue s to b e us ed in th e el as ti c de si g n of n uc le ar p ow er p la nt s is pres ented in this reg ulatory g uide, w hich was first issued in Octo ber 1 973 [Ref. 2]. L ik e the orig inal ver s i on of th i s gui de , t hi s re vis i on sp e c i f i e s eq ui val e nt vis c ou s m od a l da mpi ng val ue s as a p e r c e nt a ge of critical dam ping for Seism ic C ateg ory I SS Cs. H owe v er, the sta ff base d the orig inal d am ping v alues on li m it ed da ta , expe rt opin ion , and ot her inf ormati on avail abl e in 19 73. Sinc e tha t ti m e, th e NRC an d in du st ry h av e be en in v ol v ed in v ar io us s tu di es , r es ea rc h w or k , a nd te st in g to p re di ct a nd e st im at e dam ping v alues of S SC s. I n v iew of the av ailable d ata, the d am ping v alues prov ided in the orig inal v ersion of R eg ulatory G uide 1.6 1 m ay no t reflect realistic da m ping v alues for S SC s. A lso, it is rec og niz ed that ad ditional g uidanc e is neede d to address issue s, such as co rrelation betw een dam ping and structu res stress lev el, a nd dam ping v alues for m aterials n ot inc luded in the orig inal v ersion of R eg ulatory G uide 1.6 1 (e.g., e le ct ri ca l d is tr ib ut io n sy st em s an d re in fo rc ed m as on ry s tr uc tu re s).Ov er the past th ree d ecades , th e nu clear in dustry has pro posed dam ping v alues and discuss ed these v alues during v arious m eeting s an d rev iews of licen sing issue s. N uclear industry g roups and licensees ha v e su g g es te d th at th e N R C o ug ht to a cc ep t m or e re al is ti c da m pi ng v al ue s fo r se is m ic d es ig n an d an al y si s of S SC s, in pla ce o f the dam ping v alues prov ided in the orig inal R eg ulatory G uide 1.6 1.St r uc tu r al D am pingI n 1 993, the NR C com pleted an in v estig ation of the ade quacy of orig inal R eg ulatory G uide 1.6 1 structure dam ping v alues and other recom m endatio ns, and reported the results in N UR EG/CR-6011 [R ef. 3]. Data were analy z ed to iden tify the param eters tha t sig nificantly influe nced structure dam ping. Base d o n t ha t st ud y, t he NRC de t e r min e d t ha t th e or i gin a l Re gul a t or y Gui de 1.61 da mpi ng val ue s fo r st r uc t ur e de s i gn were adequ ate bu t requ ired o ne s ig nificant rev ision. S pecifically , R eg ulatory G uide 1.6 1 sh ould disting uish betw een "friction- bolted" and "be aring-bolted" con nection s for steel stru ctures. F riction-bolted conn ections a r e al s o r e f e r r e d t o a s "s l i p-cr i t i c a l" co nn e c t i on s. I n t he s e co nn e c t i on s , t he bo l t pr e l oa d i s hi gh e no ugh to e ns ur e th at f ri ct io n is n ot o v er co m e, a nd th e bo lt d oe s no t e xp er ie nc e sh ea r lo ad in g. R eg ul at or y Position 1 in S ection C of this rev ised g uide prov ides th e up dated structural dam ping v alues.
Rev. 1 of RG 1.61, Pa g e 3 P iping Da m pingI n 1 986, the Am erican Society of Mechanica l En g ineers (AS ME) esta blished C ode Case N-411,"A l t e r n a t i ve Da mp i n g V a l u e s f o r Re s p o n s e Sp e c t r a An a l ys i s o f Cl a s s 1 , 2 , a n d 3 Pi p i n g," i n Se c t i o n I II , Div ision 1, of the A SME Boiler and Pressu re Vessel C
ode [Ref. 4]. The NR C staff use d C ode Case N-411, with certain lim itations specified in R eg ulatory G uide 1.8 4 [R ef. 5], to rev iew operatin g reacto r issue s until C ode Case N-411 expired in 2000. The staff also app rov ed th e us e of alternate dam ping v alues for the G eneral Electric Adv anced B oiling Water R eactor Desig n in 1994 [R ef. 6], Com bustion En g ineering S y st em 8 0+ D es ig n in 1 99 2 [R ef. 7], a nd We st in g ho us e A P 60 0 D es ig n in 1 99 8 [R ef. 8]. R eg ul at or y Position 2 in S ection C of this rev ised g uide prov ides th e pip ing dam ping v alues that resu lted from the sta ff's exp erience with AS ME C ode Case N-411 and app lication rev iews of n ew reactor desig ns.Ele c tr ic al D ist r ibut ion Sys te m Da m pingReg ulatory G uide 1.6 1 d id no t orig inally pro v ide d am ping v alues for cab le tray or cond uit sy stem s. H is to ri ca ll y , th e nu cl ea r po w er in du st ry u se d th e da m pi ng v al ue s fo r bo lt ed s te el s tr uc tu re s fo r se is m ic de si g n of c ab le tr ay a nd c on du it s y st em s. I n th e la te 1 98 0s , h ow ev er , th e N R C s ta ff r ev ie w ed th e re su lt s of the cab le tray test at the Com anche Pe ak Stea m Ele ctrical S tation [R ef. 9]. R eg ulatory Po sition 3 in S ection C of this rev ised g uide prov ides th e da m ping v alues that resu lted from the staff's rev iew of d at a fr om th e C om an ch e P ea k te st [R ef. 1 0] a nd tw o sa fe ty e v al ua ti on r ep or ts [R ef s. 9 , 1 1].He at ing Ve nt ila ti on a nd A ir Co ndit ion ing Duc t D am pingThe dam ping v alues for he ating v entilation and air con ditioning (H VAC) sy stem s are consisten t with the g uidanc e pro v ided for bo lted stee l structu res. B ecause no tests of w elded duct constru ction ha v e be en id en ti fi ed , th e da m pi ng v al ue s ar e th e sa m e as f or w el de d st ee l s tr uc tu re s, a nd R eg ul at or y Posi ti on 4 in Se ct ion C of thi s re vised g uid e pro vides thes e same dam pin g values. I n addi ti on, th e NRC prov ides re lated in form ation on HVAC du ct dam ping in NU RE G/C R-6919 , "Reco m m endatio ns fo r R ev is io n of S ei sm ic D am pi ng Va lu es in R eg ul at or y G ui de 1.61" [R ef. 1 2].M e c hani c al a nd Ele c tr ic al C om pone nt Da m pingNU RE G/C R-6919 [R ef. 12] consid ers g uidanc e in Am erican Society of Civ il En g ineers (AS CE)Stand ard 4 3-05, "S eism ic D esig n C riteria for Structu res, Sy stem s, and Com pone nts in N uclear Facilities"
[Ref. 13], a nd Non-Mandatory A ppen dix N , "Dy nam ic A naly sis Metho ds," to Section I I I , D iv ision 1, of the A SME Boiler & Pressu re Vessels Cod e [R ef. 14]. I n ad dition, N UR EG/CR-6919 [R ef. 12]prov ides re com m endatio ns a nd com m entary on dam ping v alues for (1) contain m ent stru ctures, contain m ent in ternal stru ctures, and othe r Se ism ic C ateg ory I structu res; (2) piping; (3) electrical distribution sy stem s (i.e., cable tray or cond uit sy stem s); (4) HVAC; and (5) m echan ical an d elec trical com pone nts. R eg ulatory Po sition 5 in Section C of this rev ised g uide prov ides th e da m ping v alues that resu lted from the staff's rev iew of this industry g uidanc e.
Rev. 1 of RG 1.61, Pa g e 4 C. R EGU LAT ORY PO SITIONThe f ol lo w in g r eg ul at or y p os it io ns p ro v id e ac ce pt ab le d am pi ng v al ue s to b e us ed in th e el as ti c dy nam ic seism ic ana ly sis an d d esig n o f SS Cs, w here energ y dissip ation is app roxim ated b y v iscous dam ping unless otherw ise sp ecified. D am ping v alues hig her th an th ose prov ided m ay be used if doc um ented te st d at a su pp or t t he h ig he r v al ue s. D am pi ng v al ue s as so ci at ed w it h so il-st ru ct ur e in te ra ct io n an al y si s are n ot w ithin th e sco pe o f this reg ulatory g uide.1.
St r uc tu r al D am ping 1.1 Acce ptab le Str uctu ral D amping V alues f or C onta inment Stru ctures, Con tainment Intern al S tructu res, and Other Seismic C atego ry I Str uctu res 1.1.1 Saf e-Shut down Ear thq uake (SSE)Table 1 prov ides a cceptab le dam ping v alues for the SS E a naly sis.Tab le 1. S SE D amping V alues St ru ct ur al M at er i al D ampi ng (% of C ri t i cal D am p i ng)Rei n f or ce d Conc r et e
7%Rei n f or ce d M as on r y
7%Pre s t r es s ed Conc r et e
5%W el ded St ee l or B ol t ed St ee l w i t h Fr i ct i on Conn ec t i on s
4%B ol t ed St ee l w i t h B ea r i n g Conn ec t i on s
7%Note:
For steel structures w ith a com bin ation of diff erent conn ection ty pes, use the lowe st specif ied dam pin g v alue, or as an alternative, use a "w eighted av erag e" dam pin g v alue based on th e num ber of e ach ty pe present in th e structure.
1.1.2 Oper ati ng-Basi s Eart hquak e (OBE)I f th e de si g n-ba si s O B E g ro un d ac ce le ra ti on is s el ec te d to b e le ss th an o r eq ua l t o on e-th ir d of th e de si g n-ba si s S S E g ro un d ac ce le ra ti on , th en a s ep ar at e O B E a na ly si s is n ot r eq ui re d. H ow ev er , if th e de si g n-ba si s O B E g ro un d ac ce le ra ti on is s el ec te d to b e g re at er th an o ne-th ir d of th e de si g n-ba si s S S E g ro un d ac ce le ra ti on , th en a s ep ar at e O B E a na ly si s sh ou ld b e co nd uc te d. Ta bl e 2 pr ov id es a cc ep ta bl e dam ping v alues for the O BE ana ly sis.Tab le 2. OBE D amping V alues St ru ct ur al M at er i al D ampi ng (% of C ri t i cal D am p i ng)Rei n f or ce d Conc r et e
4%Rei n f or ce d M as on r y
4%Pre s t r es s ed Conc r et e
3%W el ded St ee l or B ol t ed St ee l w i t h Fr i ct i on Conn ec t i on s
3%B ol t ed St ee l w i t h B ea r i n g Conn ec t i on s
5%
Rev. 1 of RG 1.61, Pa g e 5 1.2 Spe cial C onsid eration for In-S tructu re R espo nse Spe ctra Gen erationThe SS E d am ping v alues specified in Table 1 for linear d y nam ic ana ly sis of structures hav e be en s elected based on the expec tation th at the structural respon se attribu ted to load com bination s that inc lude SSE w ill be close to ap plicable code stress lim its, a s de fined in S ection 3.8 of NU RE G-0800[R ef. 1 5].How ev er, there m ay be cases whe re the predicted structu ral resp onse to loa d co m bination s that inc lude SSE is s ig nificantly belo w the ap plicable code stress lim its. Beca use equiv alent v iscous da m pi ng r at io s ha v e be en s ho w n to b e de pe nd en t o n th e st ru ct ur al r es po ns e le v el , it is n ec es sa ry to co nsider that the SS E d am ping v alues specified in Table 1 m ay be incons istent w ith the predicted st ru ct ur al r es po ns e le v el.For structural ev aluation, this is no t a c oncern , b ecause the stresses resulting from the use of d am ping-com patible structural respon se w ill still be less tha n the app licable c ode stress lim its, as d ef in ed in S ec ti on 3.8 of N U R E G-08 00 [R ef. 1 5].H ow ev er , f or in-st ru ct ur e re sp on se s pe ct ra g en er at io n, it is n ec es sa ry to u se th e da m pi ng-co m pa ti bl e structural respon se. C onseq uently , th e follo wing add itional g uidanc e is prov ided for an aly ses u sed to de term ine in-structure respon se sp ectra: (1)
U se th e O B E d am pi ng v al ue s sp ec if ie d in Ta bl e 2, w hi ch a re a cc ep ta bl e to th e st af f wit hout fur the r re view.(2)
Sub m it a p lant-specific technica l basis for us e of dam ping v alues hig her th an th e O BE dam ping v alues specified in Table 2 , b ut no t g reater tha n the SS E d am ping v alues specified in Table 1 (e.g., see N UR EG/CR-6919 , S ection 3.2.3), sub j ect to staff rev iew on a cas e-by-case basis.I n g en er al , f or c er ti fi ed s ta nd ar d pl an t d es ig ns w he re th e de si g n-ba si s in-st ru ct ur e re sp on se s pe ct ra represen t the env elope of the in-structure respon ses o btained from m ultiple a naly ses co nduc ted to c on si de r a ra ng e of e xp ec te d si te s oi l c on di ti on s, it is n ot n ec es sa ry f or c om bi ne d li ce ns e ap pl ic an ts to ad dress this issu e. H owe v er, if plan t-specific seism ic ana ly ses are con ducted for Categ ory I structu res and/or structures not in cluded as part o f the standard plan t desig n, then the ap plicant is exp ected t o a dd r e s s th i s is s ue ac c or di ngl y.
Rev. 1 of RG 1.61, Pa g e 6 2.
P iping Da m pingTable 3 presents the constan t dam ping v alues specified for S SE and OB E (w here required)analy ses o f pipin g sy stem s. These v alues are ap plicable to tim e-history , re spon se sp ectra, and equiv alent s tatic ana ly sis pro cedure s for structural qualification
.T ab le 3. D am p in g V al u es for Pip in g S ys te ms C ategory D ampi ng V al ue S S EO B E > S S E/3 Pi pi n g S y s t e ms 4%3%As an a lternativ e for respon se sp ectrum ana ly ses u sing an env elope of the SS E o r O BE respo nse spe ct ra at al l su ppor t poi nts (uni for m suppo rt m oti on), fre que ncy-dep end ent dam pin g values shown in F ig ure 1 m ay be used, sub j ect to the fo llowin g restriction s:*
Frequ ency-depen dent dam ping sho uld b e us ed c om pletely and con sistently , if at all. (Dam ping v alues specified in R eg ulatory G uide 1.6 1 are to be u sed for eq uipm ent other than piping.)*
Use of the spe cified d am ping v alues is lim ited o nly to respon se sp ectral an aly ses. Acce ptance of the use of the sp ecified dam ping v alues with other ty pes of d y nam ic ana ly ses (e.g., tim e-history ana ly ses o r inde pend ent su pport m otion m ethod) requires further j ustification.
When used for reco nciliation or su pport optim iz ation of ex isting des ig ns, the effe cts of increased m otion on existing clearan ces a nd online m ounted equ ipm ent sh ould be c heck ed.*
Frequ ency-depen dent dam ping is n ot ap propriate for an aly z ing the dy nam ic resp onse of p iping s yst e ms us i ng s up po r t s de s i gne d t o d i s s i pa t e en e r gy by yi e l di ng.*
Frequ ency-depen dent dam ping is n ot ap plicable to pip ing in whic h stres s co rrosion crack ing ha s oc cu rr ed , u nl es s a ca se-sp ec if ic e v al ua ti on is p ro v id ed a nd r ev ie w ed a nd f ou nd a cc ep ta bl e by th e N R C s ta ff.
Rev. 1 of RG 1.61, Pa g e 7 3.
Ele c tr ic al D ist r ibut ion Sys te m Da m pingTable 4 presents the constan t dam ping v alues specified for S SE and OB E (w here required)an al y se s of c ab le tr ay a nd c on du it s y st em s. Th es e v al ue s ar e ap pl ic ab le to r es po ns e sp ec tr a and equiv alent s tatic ana ly sis pro cedure s for structural qualification. The dam ping v alues specified in Table 4 are applicab le to all ty pes of su pports, inclu ding w elded supp orts. The us e of hig her d am ping val ue s fo r ca bl e tr a ys wi t h f l e xi bl e su pp or t sys t e ms (e.g., r od-hu ng t r a pe ze s yst e ms, st r ut-hu ng t r a pe ze sy st em s, a nd s tr ut-ty pe c an ti le v er a nd b ra ce d ca nt il ev er s up po rt s y st em s) is p er m is si bl e, s ub ject to obtainin g N RC rev iew for acc eptance on a case-by-case basis.The analy sis m ethodo log y sho uld c onside r the flexibility of supp orts in determ ining the sy stem respon se to seism ic exc itation.
Rev. 1 of RG 1.61, Pa g e 8 T ab le 4. D am p in g V al u es for E le ct ri ca l D is tr ib u ti on S ys te ms C ategory D ampi ng V al ue S S EO B E > S S E/3 C abl e Tray Syst em 4 M axi m um C ab l e Lo ad i ng 1 E m p ty 2 Spray ed-on Fi r e Ret ar dant or ot her ca b l e-restraini ng m ec ha nism 3 10%7%7%7%5%5%C on du i t S ys t e ms 4 M a x im u m C a b le fi ll 1 E m p ty 2 7%5%5%3%Notes: 1.
Maxim um ca ble load ings, in accordance w ith th e plant design specif ication , are to be utilized in con jun ction w ith th ese dam pin g v alues.2.
Spa re c abl e tra y a nd c onduit, ini tia lly e m pty , m ay be a nal y ze d w ith ze ro c abl e loa d a nd the se da m ping v al ues. (Not e: R e-ana ly si s is e x pec te d w hen put i nto s er v ic e.)3.
Res tr ai n t o f th e free re la ti ve m o vement of th e cab le s in si d e a tr ay red u ces t h e system dampi n g.4.
W hen ca ble loa ding s of le ss-tha n m ax im um a re s pec if ie d f or de si g n c al cul at ions , t he appl ic ant or licensee is e xpected to justify the selec ted dam pin g v alues and ob tain NRC rev iew f or acce ptan ce on a c ase-by-case basis.4.
He at ing , V e nt ila ti on, and A ir Co ndit ion ing Duc t D am pingTable 5 presents the constan t dam ping v alues specified for S SE and OB E (w hen required)analy ses o f H VAC duct sy stem s. These v alues are ap plicable to resp onse spectra and equiv alent static an aly sis pro cedure s for structural qualification
.The analy sis m ethodo log y m ust co nsider the flex ibility of supp orts in determ ining sy stem respon se to seism ic exc itation.T ab le 5. D am p in g V al u es for HV A C D u ct S ys te ms Type of D uc t C ons t ru ct i on D ampi ng V al ue S S EO B E > S S E/3 Pock et Loc k10%7%Compan i on An g l e7%5%W el ded4%3%
Rev. 1 of RG 1.61, Pa g e 9 5.
M e c hani c al a nd Ele c tr ic al C om pone nt Da m pingTab le 6 p re se nt s th e da m pi ng v al ue s fo r m ec ha ni ca l a nd e le ct ri ca l c om po ne nt s, w hi ch a re ap pl ic ab le to p as si v e su bc om po ne nt s th at c an b e se is m ic al ly q ua li fi ed b y a na ly si s. A ct iv e su bc om po ne nt s do n ot r ea di ly le nd th em se lv es to s ei sm ic q ua li fi ca ti on b y a na ly si s, a nd r eq ui re q ua li fi ca ti on b y te st , as d es cr ib ed in S ec ti on 3.10 o f N U R E G-08 00 [R ef. 1 5].T ab le 6. D am p in g V al u es for Me ch an ic al a n d E le ct ri ca l C om p on en ts C ompone nt Type D ampi ng V al ue S S EO B E > S S E/3 M o t o r, Fan, and C
o m p res sor H o usi ngs (p ro te c tio n , stru c tur a l sup p o rt)3%2%P ressu re V esse l s, H ea t E xc ha ng ers, an d P um p an d V alve B o d i es (p re ssu re b o u n d a ry)3%2%W el d ed Ins t rume nt R acks (s tru c tur a l sup p o rt)3%2%El ec t r i ca l Cabi n et s , Pan el s , a n d M ot or C o ntro l C en t ers (M C C s)(p ro te c tio n , stru c tur a l sup p o rt)3%2%M et al A t m o spheri c Storage T
anks (contai nm ent , pro t ect i o n) - I mpu l s i v e M ode - Sl os h i n g M ode 3%0.5%2%0.5%
Rev. 1 of RG 1.61, Pa g e 10 D. IMP LEM ENT ATIONThe purp ose of this section is to prov ide in form ation to ap plicants and licensees reg arding th e N R C s ta ff's p la ns f or u si ng th is r eg ul at or y g ui de. N o ba ck fi tt in g is in te nd ed o r ap pr ov ed in conn ection with the issu ance of this g uide.Exce pt in those cases in w hich an a pplican t or licensee propo ses o r has prev iously estab lished an a cceptab le alterna tiv e m ethod for co m ply ing w ith sp ecified portion s of the N RC's reg ulations, th e N R C s ta ff w il l u se th e m et ho ds d es cr ib ed in th is g ui de to e v al ua te (1) s ub m it ta ls in c on ne ct io n w it h applicatio ns fo r con struction perm its, sta ndard plan t desig n ce rtifications, op erating licens es, early site perm its, a nd com bined licenses;
and (2) su bm ittals from op erating reacto r license es who v oluntarily pro pose to initiate sy stem m odification s if th ere is a clear nexu s be tween the propo sed m odification s an d the sub j ect for whic h g uidanc e is prov ided herein.R EG U LA TO R Y A N A LY SI S / B A C KF IT A N A LY SI SThe r eg ul at or y a na ly si s an d ba ck fi t a na ly si s fo r th is r eg ul at or y g ui de a re a v ai la bl e in Draft Reg ulatory G uide DG-1157 , "Dam ping Values for S eism ic D esig n o f N uclear Pow er P lants"(R ef. 1 6). Th e N R C is su ed D G-11 57 in O ct ob er 2 00 6 to s ol ic it p ub li c co m m en t o n th e dr af t o f th is Rev ision 1 o f R eg ulatory G uide 1.6 1.
A ll NR C r eg ula tions li st ed her ei n a re a v ai la ble e le ct ronic al ly thr oug h the El ec troni c Re adi ng Room on t he NR C's 3 public W eb si te , a t http://w w w.nrc.g ov/re adi ng-r m/doc-c olle ct ions/c f r/pa rt050. C opie s ar e al so av ai la ble f or i nspe ct ion or c opy ing f or a f ee f rom the N RC's Public D ocum ent Room a t 11555 Roc k v ill e Pike , R ock v ill e, MD; t he PDR's m ai ling a ddre ss is U SN RC PDR, W as hing ton, DC 20555; te le phone (301) 415-4737 or (800) 397-4209; f ax (301)415-3548;
em ai l PDR@nrc.g ov.A ll re g ula tory g uide s lis te d he re in w er e publis hed by the U.S. Nuc le ar Re g ula tory Com m is si on or its pre dec es sor , 4 the U.S. A tom ic Ene rg y Com m is si on. M ost a re a v ai la ble e le ct ronic al ly thr oug h the El ec troni c Re adi ng Room on the N RC's publi c W eb si te , a t http://ww w.nrc.gov/readin g-rm/do c-collection s/reg-g uid es/. S ing le c opie s of re g ula tory g uide s m ay a ls o be obta ine d f re e of c har g e by w rit ing the Re produc tion and Di st ribut ion Se rv ic es Se ct ion, A DM, U SN RC , W as hing ton, DC 20555-0001, by f ax to (301) 415-2289, or by e m ai l t o DI ST RI BU T IO N@nrc.g ov. A ct iv e g uide s m ay a ls o be purc has ed f rom the N at iona l T ec hnic al Inf orm at ion Se rv ic e (N T IS). D et ai ls m ay be obta ine d by c onta ct ing N T IS at 5285 Port R
oy al Roa d, Spr ing f ie ld, Virg inia 22161, onl ine a t http://w w w.nti s.g ov , by te le phone at (800) 553-N T IS (6847) or (703) 605-6000, or by f ax to (703) 605-6900.
C opie s ar e al so av ai la ble f or ins pec tion or c opy ing f or a f ee f rom the N RC's Public D ocum ent Room (PDR), w hic h is loc at ed at 11555 R ock v ill e P ike, Rock ville, Mary land; the P DR's m ailing address is USNRC
P DR, W ashington , DC 205 55-00 01. T he P DR ca n a ls o be re ac hed by te le phone at (301) 415-4737 or (800) 397-4209, by f ax a t (301) 415-3548, a nd by e m ai l to PDR@nrc.g ov.A ll NU RE G-s er ie s re ports li st ed her ei n w er e publis hed by the U.S. Nuc le ar Re g ula tory Com m is si on. C opie s ar e 5 ava ilable f or in spection or copying f or a f ee f rom the NRC's Pu blic Docume nt Ro om at 115 55 Rockv ille P ike, Roc k v ill e, MD; t he PDR's m ai ling a ddre ss is U SN RC PDR, W as hing ton, DC 20555; te le phone (301) 415-4737 or (800) 397-4209; f ax (301) 415-3548;
e m ai l PDR@nrc.g ov. C opie s ar e al so av ai la ble a t c urr ent ra te s f rom the U.S. G ov er nm ent Printi ng O f f ic e, P.O. Box 37082, W as hing ton, DC 20402-9328, te le phone (202) 512-1800;
or f rom the N at iona l T ec hnic al Inf orm at ion Se rv ic e (N T IS) a t 5285 Port Roy al Roa d, Spr ing f ie ld, Virg inia 22161, online a t http://w w w.nti s.g ov, by te le phone at (800) 553-N T IS (6847) or (703) 605-6000, or by f ax to (703) 605-6900.
NU RE G-0800 a nd N UR EG/C R-6919 a re a ls o a v ai la ble e le ct ronic al ly thr oug h the El ec troni c Re adi ng Room on the N RC's publi c W eb si te , a t http://ww w.nrc.gov/ reading-rm
/do c-collection s/nu regs/.Cop ies m ay be obt ained from the A m erican Society of Mechanical Engineers, T
hree P ark A venue, New York, NY 6 10016-5990.
Phone (212)591-8500; f ax (212)591-8501;
w w w.a sm e.org.Rev. 1 of RG 1.61, Pa g e 11 REF ERE NC ES 1.
U.S. Cod e of Fede ral R egulatio ns , Title 10 , P art 50 , "Dom estic L icensing of Prod uction and Util izat ion Faci li ti es," U.S. Nucl ear Regulat ory Com m is si on, W ash ingto n, DC.3 2.
Reg ulatory G uide 1.6 1, "Dam ping Values for S eism ic D esig n o f N uclear Pow er P lants,"U.S. Atom ic E nerg y C om m ission, Washin g ton, DC , O ctober 1973.4 3.
NU RE G/C R-6011 , "Rev iew of S tructure Dam ping Values for E lastic S eism ic A naly sis of Nuc lear P owe r Plan ts," U.S. Nuc lear R eg ulatory C om m ission, Washin g ton, DC , March 19 93.5 4.
"AS ME B oiler an d P ressure Vessel C ode, C ode Case N-411-1, Alterna tiv e D am ping Values for R espon se S pectra Ana ly sis of Class 1, 2 an d 3 Pip ing ,"Section I I I , D iv ision 1, Am erican Society of Mechanica l En g ineers, N ew York , N ew York , F ebruary 20 , 1 986.6 5.
Re gul a t or y Gui de 1.84 , "De s i gn, Fa br i c a t i on , a nd Ma t e r i a l s Co de Ca s e Ac c e pt a bi l i t y -ASME Se ct ion I I I ," U.S. Nucl ear Regulat ory Com m is si on, W ash ingto n, DC.3 6.
NU RE G-1503 , "Final Safety Ev aluation Rep ort R elated to the C ertification of the A dv anced Boilin g-Water R eactor," U.S. N uclear Reg ulatory C om m ission, Washin g ton, DC , July 19 94.4 Cop ies a re av ailable f or in spection or copying f or a f ee f rom the NRC's Pu blic Docume nt Ro om at 115 55 Rockv ille P ike, 7 Roc k v ill e, MD; t he PDR's m ai ling a ddre ss is U SN RC PDR, W as hing ton, DC 20555 (te le phone: 301-415-4737 or 800-397-4209;
f ax: 301-415-3548; e m ai l: PDR@nrc.g ov).Cop ies m ay be purch ased f rom the A m erican Society f or Civil Engineers (A
SCE), 1 80 1 A lexa nd er Be ll Drive, 8 Re st on, VA 20190 [phone: (800) 548-A SCE (2723)]. Purcha se inf orm at ion i s av ai la ble thr oug h the A SCE W eb si te at http://w w w.pubs.a sc e.org.Dr af t R eg ula tory G uide D G-1157 i s av ai la ble e le ct ronic al ly unde r A cc es si on #ML 062680189 in the N RC's 9 A g enc y w ide D ocum ent s A cc es s and Ma nag em ent Sy st em (A DA MS) a t ht tp://w w w.nrc.g ov/re adi ng-r m/a dam s.htm l. Copi es a re a ls o a v ai la ble f or i nspe ct ion or c opy ing f or a f ee f rom the N RC's Public D ocum ent Room (PDR), w hic h is located at 115
55 Rockv ille P ike, Rock ville Mary land; the P DR's m ailing address is USNRC
P DR, W ashington , DC 20 55 5-0 00 1. The PDR can also be reac hed b y telepho ne at (301) 415-47 37 or (80 0) 39 7-4 20 9 by f ax at (301) 415-3548, a nd by e m ai l t o PDR@nrc.g ov.Rev. 1 of RG 1.61, Pa g e 12 7.
NU RE G-1462 , "Draft Safety Ev aluation Rep ort related to the D esig n C ertification of the Sy stem 80+Desig n," U.S. Nuc lear R eg ulatory C om m ission, Washin g ton, DC , S eptem ber 1 992.4 8.
N U R E G-15 12 , "F in al S af et y E v al ua ti on R ep or t r el at ed to C er ti fi ca ti on o f th e A P 60 0 S ta nd ar d Desig n," U.S. Nuc lear R eg ulatory C om m ission, Washin g ton, DC , S eptem ber 1 998.4 9.
NU RE G-0797 , "Safety Ev aluation Rep ort R elated to the O peration of Com anche Pe ak Stea m Electric Station, U nits 1 and 2," S upplem ent N o. 16, U.S. N uclear Reg ulatory C om m ission, Washing ton, DC , July 19 88.4 10.
Ware, A.G., a nd C.B. Slau g hterbeck , "A Surv ey of Cab le Tray and C ondu it Da m ping R esearch,"I daho N ational Eng ineering La boratory , R eport No. EG G-EA-7346 , R ev. 1 , p repared for the U.S. N uclear Reg ulatory C om m ission, Washin g ton, DC , A ug ust 1 986.7 11.
NU RE G-0847 , "Safety Ev aluation Rep ort for Watts B ar N uclear Plant, U nits 1 and 2,"Sup plem ent N o. 8, U.S. Nuc lear R eg ulatory C om m ission, Washin g ton, DC , January 19 92.4 12.
N U R E G/C R-69 19 , "R ec om m en da ti on s fo r R ev is io n of S ei sm ic D am pi ng Va lu es f or th e S ei sm ic Dam ping Values in R eg ulatory G uide 1.6 1," U.S. Nuc lear R eg ulatory C om m ission, Washin g ton, DC , N ov em ber 2 006.4 13.
A m er ic an S oc ie ty o f C iv il E ng in ee rs , A S C E S ta nd ar d 43-05 , "S ei sm ic D es ig n C ri te ri a for S tructures, Sy stem s, and Com pone nts in N uclear Facilities," R eston, VA, 20 05.8 1 4.
A me r i c a n So c i e t y o f M e c h a n i c a l En gi n e e r s , "B o i l e r a n d Pr e s s u r e V e s s e l Co d e ," Se c t i o n I II , Di vis i on 1, Non-M a nd a t or y App e nd i x N, "D yna mic Ana l ysi s Me t ho ds ," Ne w Yo r k, Ne w Yo r k, 2004.5 15.
NU RE G-0800 , "Stand ard R ev iew Plan for the R ev iew of S afety A naly sis R eports for N uclear Power Plan ts ," U.S. Nucl ear Regulat ory Com m is si on, W ash ingto n, DC.4 16.
Draft Reg ulatory G uide DG-1157 , "Dam ping Values for S eism ic D esig n o f N uclear Pow er Pla nts ," U.S. Nucl ear Regulat ory Com m is si on, W ash ingto n, DC.9