ML19345G080

Forwards Revision 1 to Response Re IE Bulletin 79-14 Revision 1,Suppl 2, Seismic Analysis for As-Built Safety-Related Piping Sys. Describes Program Which Will Give Assurance That Design Documents Reflect Sys Conditions

ML19345G080
Person / Time
Site:	McGuire, Perkins, Cherokee
Issue date:	01/27/1981
From:	Dail L, Parker W DUKE POWER CO.
To:	James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
References
IEB-79-14, IEB-80-21, NUDOCS 8102190903
Download: ML19345G080 (7)

Text

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DUKE POWER COMPM Powen Buttnixo 4cc Socru Cetacu Stuzzt. CitAntoTTE. N. C. as242 l7  !

W I LLI AM O. PAR M E R. J R.

'tL e e=c=t. Ap t a 7 0 4 WCE **ES CENT s.t - **ooscwo~ January 27, 1981 37 3..c .3 c

4 Mr. J. P. O'Reilly, Director U. S. Nuclear Regulatory Commission Region II 101 Marietta Street, Suite 3100 $ D N

At,lanta, Georgia 30303 4 ,

Re: McGuire Nuc Station, Unit 1 8 ,, g

] Docket No. 36 b

~

IE Bulletin 79-14, Revision 1, Supp. 2 FEB 0 61981

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h v.s.iaxws co.wissen **

Dear Mr. O'Reilly:

/( n gy j Attached is Revision 1 to our response to the subject IE Bu _ is revision is made to incorporate specific identification of the final scope of inaccessible support / restraints for Unit 1.

3 If you have any questions regarding this information, please advise.

V ry truly yours,

. t - -

6 I ' William O. Parker, Jr.

GAC:ls Attachment cc: T. J. Donat, Senior Resident Inspector, McGuire Nuclear Station T

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'810219 0cico 4

r PCWER COIPANY DC'2 MCGUIRE NUCLEAR STATICN RESPONSE TO CSNRC I & E BULLW 79-14 IES urzrxc G : IEB 79-14 Revision 1 Supplement 2 RESPONSE Etzt.Et2;CE: Original Issue - 11/01/79 Fevision 1 - 01/27/81

Pace 1 McGuire Nuclear Station Pesponse To IE Bulletin 79-14, Fevision 1, Suppleent 2 PART I Cescribed herein is the procran for McGuire Nuclear Station which M e Pcwer Co many has developed to provide assurance that design doc rents which provide input to seismic analyses for safety-related systes refic-t the as-built condition of these systes. This response descrites those elcnents which are important in verifyinc the conformance between desian doc m ts and the as-built conditica as mil as details of the inspection program utilized to assure con-fo=ance.

i 2.e follcwing inspection elcnents are important:

1. Pipe run geanetry.

2. Pipe support and restraint desicn, includinc pipe supoort type, locaticn, functicn, and clearance for seismic pipe succorts.

3. Pipe support attac.52nt to ebedrent.

4. Pipe attachments.

5. Valve and valve operator identification, location, crientat.cn, center of gravity, and weight.

6. Crifice flanges and other line flanges.

These inspection elements are covered under an on-coing, intecral part of the construction program for McGuire Unit 1. Detailed description of this program is provided in PART II. Much of this program is applied during the nor al course of *cGuire 1 erection, and portions or our inspection procram have occurred more than 12 cenths prior to issue of IE Eulletin 79-14. Ccepletion of this inspection program will rot occur until near the end of Unit 1 construction which is more than 120 days after the date of this bulletin. Nonconforrances are resolved in the norral course of construction and of completing the inspection prceram.

Our review of the inspection methods and practices described in PART II confics that all elenents of ou" inspection program completed pre /iously reain valid.

We are continuing, therefore, with the program underway and described herein to cceplete inspection of safety-related systes and simultaneously satisfy the recuirements to IE Bulletin 79-14.

A final reviea of drawings for eauipnent, pipe layout, and pipe support locaticr is perfc =ed for safety-related systes to assure that engineering and desian inccgorate the current drawing information. Nonconforrances between desien docets and the as-built conficuration are considered in this review, and piping systcm seismic analysas are revised where apprcpriate.

Page 2 Erecticn of McGuire W.it 2 systers has nct pmessed to de point dat significant ccrpariscns beceen design doc =e .ts and as-built configuraticn are pcssible. At de apprcpriate tire this ccrpa.dsen will be acblemd by a procran al. m cs identical to dat for Unit 1. h?dle early Urdt 2 inspectims are carencing, ccroleticn of this procran will be later in de Wit 2 ccnstracticn pericd.

Se described inspecticn progran provides assuranm dat design doccents reflect de as-built e diticns. Se noral edods of work ccntrol provide assurance dat engineering grcups perfering seisric analyses revies design doc =ents whid define de as-built ccnfiguraticn to evaluate effect cn seisric input asstr=ticns. At the empleticn of ccnstructicn and de inspecticn prc-cram, we will ham achiemd acree. ent het-en c..sicn docrents (and, ccrse-cuently, seis-ic analyses) and the as-built conditicn.

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Duke ',aer Cxnany has revieaed inspecticn edcds and practices which ham been used and are in ecntinuing use in the ecnstructicn of McGaire Units 1 and 2. "hese inspecticns are satisfactcry, both in present and past use, and provide a hich decree of assurance dat any deviaticns frcra design docrents will be identified. All identified deviatacns are either ccrrected er an evaluaticn is perfer ed by de apercpriate engineering group to preeide the basis fcr accepting the deviaticn and revising de design doc =e.nt. Details of de instecticn progran are su=arized belca.

1. Pipe run gecretry and ccnfiguraticn inspecticns are perforced in ac:crdance with CA Prccedure M-8. ?ds inspecticn incitries verifying the general ccnfiguraticn and that dere are no abncr-ral dips, bends, cr distcrticns. Pipe run gecret y is de*2=ined drcuch v:.sual estiration of dinensicns with an accuracy of ,6 inches. Se piping locaticn is deterined by checking elevation chances, verifying dat pipe passes drcuch prcper openings, check-ing branch ccnnecticn locations, and visually verifying arrance-ent.

Se pire st-w revies described in paragraph 2 teloa provides additicnal verificaticn of prcper piping configuraticn.

2. In June 1979, Duke initiated a progran to reviea each of apprcx-i ately 14,000 pipe stsports of Unit 1 safety-related piping.

?ds reviea ccmrs all aspects of design incitxiing: pipe sucpert type,1ccaticn, critical dirensicns (incitriing clearances) , remer sices, pipe attachrents, welding, base plate, and ccncre+2 exparsicn anchcrs. Pipe suppcrt lccaticn and dirensicns are determined by actual reasurerent. Clearances between piping and support and between integral piping attachrents and st=n rts are reasured. Clearan s beteen piping and penetraticns are visually estirated. Eeral insulaticn is rercied to facilitate inspecticn of all pipa st=part details. Nccccnfocances are evaluated and justified by appropriate engineering revies and/cr analyses as regaired.

Iocse ccncrete excansicn ancher bolts in pipe supports have been corrected as part of the program described herein. Duke will perfern additicnal testing and inspecticn of self-drilling, shell-tym expansicn anc"crs for pire supports in accordance with our respcnse to IE Bul-latin 79-02.

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a 1 A small nteber of pipe supports cannot be inspected under the program described in paragraph 2 abcw because of inaccessibility. -

In each such case, the pipe support drawing is marked as inaccessible. ,

Failure to revica these pipe suppcres is acceptable in viea of the relatimly s all ntnber of inaccessible areas; the relatiwly low prcbability of a prcblem with an inacmssible pipe su= port er part of a pipe su;rcrt; and earlier pipe support insmcticn during erecticn.

Final deteminaticn of inaccessible support /mstraints has been ccepleted for M2 ire Unit 1. These support / restraints were inacces- I

sible for detailed inspecticn as required by the Ibinspecticn Program (started June 1979). All of these support /restr-ints haw been previ- ,

! cusly inspected and, tmder the current p ogram, the general ccnfigura- t l

tien, raterials, and lccaticn have been vurified. Table I provides a 1 strrary of the ntrber of support / restraints by system, the reascn for inaccessibility, and notaticn of any suppcrting infor aticn and evalua-ticns since the criginal inspecticn. Table II prcnides a listing of the individual suppea/mstraints.

j "he result of this revica is a cccy of the pipe surport draaings, '

rarked as necessary to dccucent the as-built ccnditicn. Sa as-

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built pipe support locaticn data am provided to the apprceriate i engineering grcups for evaluaticn of any physical chances cn the piping seistic analyses.

i n siriliar review will be perfor ed for pipe supports cn Chit 2 safety-related piping as part of the pipe support erecticn process.

i 4 3. The attach:ent of pipe sty _s to erbed ents is wrified during the I pipe support revica described in paragraph 2 abcne. l

4. Any wided pim attactrents are inspected for proper raterial and size in accordance with QA Procedures M-4 for Duke Class A, B, and C piping (ASSE III, Class 1, 2, and 3). and M49 for Duke Class F  ;

e piping. In additicn, nozzle reinforcerents are inspected for size, l thickness, and length through CA Procedure M-8.

l 5. Valves are inspected to wrify through valm identificaticn tags that the ccrrect valm is installed, that it has the correct type of cper-atcr, and that it is located properly in relaticn to the piping lay-cut through CA Procedure M-8. Ra weights and centers of gravity for l valms and valve cperators are available frcm equipcent draaings.

Valve and valm cperator are related to the apprcpriate drawings through the valm identificaticn tags.

i, l 6. Crificn flanges and in-line ficw nczzles are inspected for correct ccn-figuraticn and locaticn within the piping system through CA Pro dure M-8. ,

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draisaqe of a larqe anamuit of oil.

12 lu-nsitairrent Vt.nt. Class r in Histe Shigolivi As tu Inspct ion of tic S/b's w>uld reneral nnfigsu ation aril locat ice Goliar; rurnire f ailldityg of a lanw anamint wre fuual to le aharute inen . dant of ex:af f oldini .unt isolatice of 20 feet (Awxvation inint .

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