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DISTRIBUTION:Docket No. 50M 60July 22, 1983NRC PDRLocal PDRPRC System

Docket No. 50-460 LB #4 r/fEAdensamMThadani

Mr. D. W. Mazur MDuncanManaging Director TNovakWashington Public Power Supply System RVollmer SChanP.O. Box 968 JPKnight Attorney, OELD3000 George Washington Way RBosnak JMTaylor, I&ERichland, Washington 99352 RKirkwood DLJordan, ISE

**Dear Mr. Mazur:

Subject: WPPSS Request for Approval of ASME Section III,Division 2 Addenda Articles and Code Case Approvals

References: (1) VPPSS letter from G. D. Bouchey to Director of NuclectPeactor Replation, NRC, dated June 6,1983.

(2) UPPIS letter frmi G. D. bou". rey to Director of NuclearReactor Regulation, DRC, dated June 10, 1983. |

The staff his received tt'e subject WPPSS request for the use of Cod ( Case N-235,N-3/A, U-354, N-3o4, N-365, N-W6, N-380, tad s barticles CC-5M, CJ 5260,CC-3422.1, and CC-3432.1 trancnf tted ir, rafarence (1). Tne s+aff has cure.ideredthe addf tio';al infom'ttien pr(sented by WPP!S ara its contryctor during a ?.ceting ,

in Ecthesda, Marylano, ott June 8,1983, and in reference (2). Following are the 1

staff conclusions regarding the requested apcrovals for Addenda, Articles, 2ndCode Cases.

The following code cases are acceptable and are am: roved by the Comissior, for i

general use ard may be used in the construction cf the contairenent during theperiod the cede cases are in effect as indicated belcw. he find that the appli-cant's proposed use of these code cases, as outlined in reference 1, to beacceptable.

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1. Code Case N-285 in effect from July 14, 1980, through July 14, 1983.

2. Code Case N-344 in effect from July 7,1982, through June 30, 1983.

3. Code Case U-354 in effect, that is, from September 7,1982 throughSeptember 24, 1985.

4 Code Case N-364 during the period the code case is in effect.

5. Code Case N-365 during the period the code case is in effect.

6. Code Case N-366 during the period the code case is in effect.

7. Code Case N-380 during the period the code case is in effect.

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Article CC-3422.1 of ASME Code Section III, Division 2, pemits reinforcing bar yield-ing under loading conditions which include themal effects. The 1977 Winter Addendaof this article clarified the limit of yielding by establishing a maximum net tensilestrain of 2 y in the reinforcing. Since in the WNP-1 design this controlled yieldingis applied only to the main reinforcing bars in bending or tension, and no yielding ispermitted for radial or peripheral shear reinforcing bars, we find that the designwhich satisfies these provisions is acceptable.

Article CC-3432.1 of ASME Code Section III, Division 2,1975 Edition, permits rein-forcing bar stresses to be increased by one-third during the structural integritytest, while the Summer 1979 Addenda of the code permits a one-half increase in allow-able reinforcing bar stresses when the temporary pressure loads during the test con-dition are combined with other loads in the load combination. Based on the 60 ksiyield strength of reinforcing steel used in WNP-1, the calculated allowable reinforc-ing bar stresses with no increase, one-third increase, and one-half increase are,respectively, 30 ksi, 40 ksi and 45 ksi without accounting for the additional strengthprcvided b) the containment liner which in reality resists a significant portion ofthe pressure loads. The cctual stress measured in the rainforcing bars daring theWNF-1 structural integrity pressuFe test was 25 ksi which is substentially lowt.r tMnthe calculated allcwable stress. Considering the low level of reinforr.ing steelstresses that actually eyist in the contairrcant structure, we flM thn tre n:e ofone-half increase in allowable reinforcing bst strasm for th desiga of WNP-1 con-tairscat 5tructure under the test coMition is acceptable.

Article CC.,5340 of ASME Code Section III, bivision 2, requires visual examinationnf the bent or straightened surfaces of bars for indication of cracks, but doesnot differentiate between shop fabrication, field bending er bending of alreadyeaoedded bar. The Summor 198?. addenda clarifles that bars partially en; bedded inconcrete and bars that are bent and/or straightened in the field require examin- ,

|eti on. The staff disagrees with the applicant.'s interpretation thct only barspartially embedded in concrete require examination. (Attachment A to Reference 1).We find the Sumn.er 1982 Addenda to Article CC-5340 of ASME Code, Section III,Division 2 to be acceptable provided that all reinforcing bars which are partiallyembedded in concrete and all reinforcing bars which are bent and/or straightenedin the field shall be visually examined for indications of cracks.

Article CC-5200 of ASME Code Section III, Division 2, requires the minimum testingfrequencies of Table CC-5200-1 for concrete constituents and concrete. The Summer1980 Addenda relaxes the testing frequency for water and ice, the quality of whichdoes have negligible influence on compressive strength and soundness of concrete.In some cases the testing frequencies have been extended from once a month to once

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every six months. Considering the fact that the past testing results of water andice for the WNP-1 construction have been consistent for several years and have beenwithin the limits specified by the Reference Code, extension of testing frequenciesas recommended by the Summer 1980 code addenda seems reasonable. The applicant hasalso stated that for WNP-1 construction testing of water and ice has been perfonaedmonthly as required by the Reference Code except for two instances when a monthlytest was not performed. In view of the irreversible nature of concrete constructionand the significant margin of safety that is incorporated in the design and analysisof plant structures, we believe that these two occasions of missing a monthly testshould not affect the overall safety of the structure or have significant adverseeffect on the quality or compressive strength of the concrete. On this basis wefind that the applicant's request to use the Summer 1980 Addenda, Article CC-5200,Table CC-5200-1, Item " Water and Ice", of ASME Section III, Division 2, for WNP-1construction is acceptable.

Should you have any questions, please address them to our licensing Project Manager,Mohan Thadani at (301) 492-7821.

Sincerely,|

ThIomas M. Novak, Assistent Directorfor Licensing

Division of Licensing

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WNP

Mr. D. W. MazurManaging DirectorWashington Public Power Supply SystemP.O. Box 9683000 George Washington WayRichland, Washington 99352

cc: Mr. V. Mani Nicholas D. Lewis, ChairmanUnited Engineers & Constructors, Inc. State of Washington30 South 17th Street Energy Faciltiy Site EvaluationPhiladelphia, Pennsylvania 19101 Council

Mail Stop PY-11Nicholas S. Reynolds, Esq. Olympia, Washington 98504Debevoise & Liberman1200 Seventeenth Street, N.W., Suite 700 Mr. Eugene RosolieWashington, D. C. 20036 Coalition for Safe Power

Suite 527Mr. E. G. Ward 408 Scuth West Second St.

,

Senior Project Manager Portland, Oragon 97204Dabcock & Wilcor Company'

P.O. Sox |269) Lynchburg, Virginia 23505

Resident Inspector /WPPSS NPSc/o U.S. Nuclear Regulatory

Com:nissionP.O. Box 69Ricnland, Washir.gton 99352

:

Mr. R. B. BorsurNuclear Power Generation DivisionBabcock & Wilcox7910 Woodmont Avenue, Suite 220Bethesda, Marvland 20814

G. E. Craig Doupe, Esq.Washington Public Power Supply System3000 George Washington WayP.O. Box 968Richland, Washington 99352

Jack Martin, Regional AdministratorU.S. Nuclear Regulatory Commission,

Region V1450 Maria Lane, Suite 210Walnut Creek, California 94596

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