ML19319A673
| ML19319A673 | |
| Person / Time | |
|---|---|
| Site: | Oconee  |
| Issue date: | 09/21/1976 |
| From: | Schwencer A Office of Nuclear Reactor Regulation |
| To: | Parker W DUKE POWER CO. |
| Shared Package | |
| ML19319A675 | List: |
| References | |
| NUDOCS 7911210621 | |
| Download: ML19319A673 (4) | |
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50-210 and 50-237
!! uke Power Cenoany ATTH:
'tr. Jilliam O. Parker, Jr.
Vice President Stean Production Post Office Box 2173 all South Church Street Charlotte, Earth Carolina 2F242 Gentl eaen:
RE: CCCMEE, T!ITS 1 ? & 3 General Design Criteria (GDC) 30 and 32 'of Appendix A to 10 CFR Part 59 recuire tnat coe.conents that are part of the reactor coolant pressure noundary receive periodic inspection and testirq of critical areas to assess their structural and 14akticht intecrity.
The ste.w generator tunes constitute over 50"> of the area of the total prinary systm pressure-retaining boundary in pressurized water reacters. Cur letter da*ed July 18,1972, requested you to proccse suf taole technical specifications for the surveillance of the stean cencrator tubes consistent with the recuirecents of the GDC and Reoulatory Cuide 1.83 titled " Inservice In-spection of Pressurizea water Reactor Steen Generator Tubes." Since four r;eorosal was su:mittac, R.G.1.83 has been revised; tnerefore, we reer:ett that you revise your subinittal to De consistent with the enclosed 7ccel technical specifications which are based on ?.evision 1 of R.4.1.83, cated July 1975.
Doth the nrfginal and revised R.S.1.93 refer to a tut,e rimning liai:
and olug:ing criteria, but neither provides guidance on how these are to be quantifiad._ The plunging linit in the enclosed mocel technical sec.:1fi-cations is based on :ne minlaun tube wall thickness n.secea to a.alntain tune intenrity curing a LCCA combined viith a safe snutdo$m earthouake and an c.mrational allowance to account for time intervals netween inscec tions.
'.;e hava cercleced that plumino linits thst ara basN on *hese consideratic satisfy tha rce;uirenents of the G"'C ant: are acce9 table to us.
Stea, pnnator tune leakaos can de an indication of tee decracationi ther fore, '-re Mve concl'Meo tnot a leats';e liait anc a li~itiv ccncition for eneration should oc incl'uod in t9e technical saecific3tions to esure tinei" sction in +2e event of st?an gener6 tor tuce cracaticn.
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SEP 211976 Duke Powr Conpany Certain steam generators have ccepleted the first cycle of operation with tube inspection results that have indicated little discern-ible degradation. These early-in-life inspection results may not be incicative of the total 40 year desien life of stc.u cenerator tubes in terms of tube integrity.
Therefore, we hay: corcluded that sur-veillance of stea:a (;enerator tube integrity seculd be covered by technical specificatiens for all facilities including tr.ose 6.tsere early inseection cycles nave not irdicated any ciscernicle or increasino degradation.
The enclosed mdel technical specificaticas gives credit ter favora31e early inspection results by extencing subsequent inscection intervals and keeping at a minimum tne nunber of tubes to be probed.
We recuest that within 45 cays of re,eipt of tnis letter, ycu revise or resucnit your request for a license ameneent using the encloseo nocel technical soecifications for guidance.
The acdel tecnnical srecifications should to a:Dropriataly acaeted to your specific forlat anc to the nunDer of steaa cederators in your plant.
Sincerely, grigmal signed by A. Scbvencer, Chief Operating Peactors Branch 41 Division of Occrating Pesctors
Enclosure:
Model Technical S.necifications cc w/ enclosure: See n?xt page DISTRIBUTION See previous yellow FOR CONCURRENCES, SEE PREVIOUS YELLOW
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M cp yi Duke Power Ccapany Certain s air n nerators have conpleted the first cycle of operation with tu i
,. tion results that have indicated little discern-ible d - aa on.
hese early-in-life inspection results may not be indicative f +.,otal 40 year design life of steam generator tubes in terats o uba ntegr Therefore, we have concluded that sur-veillarce of s 33 era r tube integrity should be covered by technical specifications r all cili
.cluding those where early inspection cycles have not indic ed di ernable or increasing degradation.
The enclosed nocel tc.. cal s-cificatians gives credit for favoraole early inspection results by tend, sr equent inspection intervals and keeping at a ninint.n tb.
n'" er o ubes to be probed.
'de request that within 45 days of ece of is letter, you revise or resubni t your reauest for a licei -
mend-. t usina the enclosed ocdel technical specifications for guidance.
e na chnical soccifications should De aporopriately adapted to yot y. fi format and to the nunber of stea i generators in your plant.
Sincerel.
A. Schwencer, Chief Operating Reactors Bran.. el Division of Operatino Reacte s
Enclosure:
.Model Technical Specifications cc w/ enclosure:
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L Duke Power Company __ '
September 21, 1976 cc: Mr. William L. -Porter
- dup.e :Pouer Company P. O. Cox 2178 422 South Church Street Charlotte, Nortn Carolina 28242 Mr. Troy B. Conr.er Conner &'Knotts 1747 Pennsylvania' Avenue, N.11.
Washington, D.: C. -20006 Oconea Public Library 201 South Spring -Street Walhalla, South Carolina 29691 i
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