NG-92-3961, Forwards Response to GL 87-02, Verification of Seismic Adequacy of Mechanical & Electrical Equipment in Operating Reactors,Usi A-46. Util Commits to Use SQUG Methodology, Per Rev 2 to Generic Implementation Procedure
| ML20118B079 | |
| Person / Time | |
|---|---|
| Site: | Duane Arnold  |
| Issue date: | 09/21/1992 |
| From: | Franz J IES UTILITIES INC., (FORMERLY IOWA ELECTRIC LIGHT |
| To: | Murley T NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM), Office of Nuclear Reactor Regulation |
| References | |
| REF-GTECI-A-46, REF-GTECI-SC, TASK-A-46, TASK-OR GL-87-02, GL-87-2, NG-92-3961, NUDOCS 9209290394 | |
| Download: ML20118B079 (52) | |
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I lima lettric 1.ight arul Pimer Company ! l 4 l Septembe2 21, 1992 HG ~ '/2 - 3 9 61 ii N sHN I. I N AN/, AR iu e ..nem i o Dr. 't h inal. E. Muriey, Di rect or ' Office of Nuclear iteactor Eogulation U. S. IJu e l ea t Regulatory Commiaaion Aitn: Docunmnt Control Desk Mai] St at ion Pl-137 , Wabbi nyt on, DC 2 0 % b Sulaj ect : Duano A1nold Energy Center Docket No: 50-331
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- DDR-49 Hosponse to Supplement 1 to Gennric I.et ter P7-02 on SQUG Resolution of USI A-46 File: A-18, A-10lb D<Mr Dr. Murley:
On February 19, I 9 87, t.he NRC isouEd Generic Lettml 87-02, aWr i f icat aan of Seismic Adequacy of Mechanical and Elect rical Equipment in Operating Reactors, Unresolved Safety lusuo (USI) A+ 46." Thin Generic Letter encouraged utilition to participate in a generic program to lu:mJ ve the seisn.ic verification issues assuciat ed wit h US1 A-4 6. As a result, the Seismic Oucjification Utility Group ( SCtUG) developed the " Generic Implementation Procedure (G1P) for Seismic Ve11fication of Nuclear Plant Equipmenti" On May 22, 1992,_the HRC Staff issued Generic. Letter 87-02, Supplement.1, which t ransmit t ed Supplemental Saf ety Evaluat ion Report No. 2 (SSER-2)' on t he GIP, Revision 2 (corrected on February 14, 1992). Supplement 1 to Generic _ Letter 87-0; requeatn t hat within_120 days, _ Nch _SQUG member utility i trovide a schedul9 f or implement ing tim GI P. 13y l et t er - da t ed - Auguat 21, 1992, to James G. Partlow, NRR-NRC, SQUG clarified that the 120 days would expire on September 21, 1992. This let t er respends to the Staf f 's request in Supplement 1 to Gene'lic-Letter 87-02. EIowa El ect ric Light and Power (IELP) coliuni t s t 'o une the SQU3 met hodology an documented in t he GIP Revision 2 .(corrected February-14, 1992)- to resolve USI A-46 at the Duane Arnold Energy Cent er (DAEC). The GIP, as evaluated by the Staff, permits licenaecs-to deviate trom-the SQUG commitmento embodied in the Commitment sections,-provided the Staff is notified of cubstantial deviations prior to implementation. IELP recognizes that the Staff'a:ponition in SSER-2 "is that if licensees-use other - met hods that deviate from the criteria and proceduren as ll dendribed in SQU.G commitments and in the implementation-guidance L 9209290394 920921' , PDR ADOCK'05000331' ,. l l- P PDR.,
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u f. 'im G1P, Pm ;, w2thout p r 101 URC ;tafI al .pl ova) , the tiethod m.r/ m :t m < n 93 t oble tn t.he 0;aff nnd, t het ef, ore, u@ renult in a do /iot i on ft( m t he pt wiaient of" Genatic Lotter 87-02. IPLP genw al]y till he guided by ot hut cectione of the GIP which oro not- < > .mtm t nw n t a , 1. c . , G.11' itnplementation guldance, which e nprine ;uque st ed nwt hodn for in.plement.tng the applicable ac-an i t:m n t s . (1ELP will nutsty the DEC as soon an practicable, bu t- no lat m t han t he final USI IH t; nummary report, of any
- 1'Jui i * ' un t a pt t gi cumat ic dtva at ionr f rom the guidance port ions -
of the GIP. .iuat i t ient j uns f. t 1 such deviat. ions, ae wel l e s for ot hm , mirer deviationc, will be r et ained on site for MRC 1 L:' ' l e 1
% :b:t ine uei mi c denut ul, IELP will use the Options provided in the GIF- fm anam vative design in structure responue opectra depentling on the building, the Jucation et equipment in the huilding, and equipment CharacteriSLIcJ.
- The l i ceind nu - bam : apectra, approved by the AEC in the Safety Evaluation af t h." Di.Eu (Janu,n y ?3, 3973) will be used and.are Colla i t hal
- Kl t o b* cDi1M rVative desion. 'Ine procedures and critetta which wer e uaed to gener:1te t he licensing-bM ia in-structure r>:p noe Toctra are desetibed in the Attachment to t hi. let t er G4 ven the magnit ude of the effort required tu achieve resolution 01 UDI A-46, final implement 6t ion will be int:egrat ed with i eboduled refuel cmtagea and the seinmic IPEEE response, the
- con pl+:t i on of vhich may be aftected by'the USI A-46 imp i en ent at a t in sta t t ' dat e . A Seinmic Evaluation Report sungna t i ni ng the r e mits of the USI A-46 program at DAEC will be ubmit t ed t o t he ufc by November 21, 1995. However, the schedule foi complet ion of the USI A-46 prtw am may be atfacted by
- cordinat ion wit h t he veinmic IPEEE ' response, the scope and
< chedule f or enmplet ing the necessaly SOUG t raining and by the -
availability of industry resourceu which may be adversely itnpacted by the large number of licenseea implementing this program. The abovs uchedule cmsumes that we are notified promptly that the acheclule and canalitments stated in this letter are acceptable. 11 such notification is not received by November 20, 1992, we mus t teochedule the USl A-46 completion date to permit coordination with planned refueling outages scheduled for July 1993 and Iebruary 1995. l
t. e ., I I Dr. Thet;.ao E . Mu ley Sept ember 31, 19 W _j l I M -- ) 2 ~ 3 9 (t } l lage 3 This letter in t r ue and aceut at.e t o t he best of n:y knowledge and bA ivi. 10WA ELECTRIC L.ICilT AND POWER COMPM4Y qj
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- f ( 31 000 in Ee"OlV[DO U h* 1 /.- 4 6 Th - in ;t t uct ut e :t e J p ;n a o Spvt:a to be uwd by IELP in resolving USI A-40 a: + e <iat i no lict iming-basi: myct1a. The r.poctra were generated noing p r-v mit u e n deacri hd 2 n pet iona 4./.1 and 3.7.2 of the FSAfl.
Ther ;# plt .W l u r e 'l die ;11mMQri Ted hel OU l The w 2 umir input, ior tho d<.mi on baniD mit t hquake (DBE) f or t he DAliC i sie g r oumi tra 2 on opu ra mth a leak hatizantal ground acceleration : I ( l '. ils ) *
*! s'. }?g. Tl10 t ij@ra t i ng l uf3 i P ea t't hqudke (OBE) ground motion yet ro m'> ont-haJ! tho DHE cpetIa.
'n at t i t it ;a1 t im hist Oty of the hm inont al groarni motion was D * "l(;j a d l o s.t q l On f l,3 j940 Ej ' ynt. r o , Californid OdIlhquake [QL USe U .i b p i t i la (}W dyn;mit hGilding MSlelL. TllO CalCulalOd TOUpOn30 y ett i a 11 m t he arta ticial tim histoty enveloped t he target seismic de 3 5 'f n g l' CHln d spoet t a . Thir ar t if icial time history was applied t o Oynam1C 'O i umi t W deld U[ the 30 Mni c Jul6901y 1 ULTUClu1OS dnd t h0-time hiat uty 1 ;ponse at each f)cor waa comput ed. In -st ruct ure i e lf;Onut_ qw m t l ot WOT P t }lOn quhel u t ed ! ! :.$t the f1001 time hiGlorieD.
The w p eria ato ronajdered to be conservative denign in-structure !' t e :p mm spectro n defined in the GIF. Thoc .fiumic buildilig modelu ?ODO:sted of t hree-dimen tii ona l lumped mass , analytimi models. The genera 1ined mass and atiffnese properties were Cd3JU1dlOd ODing COnVOOLiOnal 3CEUctOrd} GOChaniCS mCthOdD. St.ru ct u ra l damping wag baDOd On the Composite m0 del domping teChniGUG. Individual d oping coM ticiento langed from 1 to 5 percent such that the ovei J 1 eq u.i va l en t damping waa less than or equal to 5 percent, , 3nisnu e models for t he t eact or building, control building, intake l at t uct ute, pump houae and turbine bailding are shown in Figures 1 t hr ough 5, re ;pect ively-. CulcuJated model frequencies are tabulated i n TQ b,I ' > } through 5. - l . . tu --
$ n m , . 4 .b ass Buil Sprillgd butWUOn Llie St.t uct.ure and the f ourdation in t,ne seismic mode!F. Tlm ,o i l splinga modeled the /ettical and tranulational '
at i f ineas M the toandation. The atiffnea propertius of the coil zpringc were based on 2he p ocedure-provided by Ehitman and Richard (DOOign PloCOdurOJ tur DyLmically Leaded F00ndittions, ' by R. V. Whi t;Nin and F . E. inchnrd, Jr., J; Soll Mech. and Fod, Div., ASCE, , SM7, Naveni n 1967, pp 169-193). Wpical in-str uct are l esponse spectra f or the reactor building, contial buildin[1, ant ake at ructute, punp house and turbine building are provi&d in Fictures 6 through 10, respectively. These spectra are-OBE. In~ d acrute reaponse spectia fo: the DDE are two times the OBE 3 pe ':t- ra . The in - s t ruc t '.n o responce spectra provided in Figurea 7 through 30 shov a maximum of 2 percent damping. These curves will bei adjualed fOr E perdent ddmping for me in GIF implementetion. i i I
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