ML17275A720

Interim Deficiency Rept Re Inadequacy of Sway Brace Brackets Mfg by Power Piping Co,Initially Reported on 800820.Caused by Undersized Welds & Poor Weld quality.In-plant Insp of Brackets Performed.Next Rept Is Scheduled for 810202

ML17275A720
Person / Time
Site:	Columbia
Issue date:	11/26/1980
From:	MATLOCK R G WASHINGTON PUBLIC POWER SUPPLY SYSTEM
To:	ENGELKEN R H NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V)
References
10CFR-050.55E, 10CFR-50.55E, G2-80-271, GO2-80-271, NUDOCS 8012030728
Download: ML17275A720 (8)

Text

REGULATOR'NFORHATION DISTRIBUTIONi TEH (RIDS)ACCESSION NBR: 8012030728 DOC~DATE: 80/11/26 NOT'ARIZEOo NO DOCKKtl'ACIL:50-397 tirPPSS Nuclear Pr oject~Unit,.2i Nashington Public Powe 05000397 AUTH'AHE, AUTHOR AFFiILrIATION HATLOCKER.G..

AashingtonI Pub.lic Power Supply System REC'IP~NAHE.RKCTIP1IE(4'T~

AFFILIATION ENGELKENER

~HE~, Region 5E-San Franc:iscor Office of the Directo.r g rl

SUBJECT:

Interlim def i c1i ency rept re inadequacy of0 sway br ace brackets mfg b',y Power Piping Co,iinitially reported on 800820.Caused by undersized welds&poor weld quality,In~plant insp of brackets performed;Next rept is:-scheduled for 810202..DISTRIBUTION CODE': BO ISO COPIES RECEIVED:LITR L<ENCLI J SIZE'I TLE: Const r uc t i on De f i c i ency Repo r t (10CFR50,55KI)

NOTES:PH: 2 copies oif al,l mater:i el.05000397 REC'IP IENTi I D CODE'/N AHE i" ACTION: A/D LrICENSNGT 04 RUSHBROOKgH

~, 06 INTERNALi:

AD/RCI/IEi 1,7 ASLBP/Ju HARD KDO&STAFFr 19 HYD/GKOI BR.22 LiIC QUALI BR 12 NRC PDR 02.KV 13 EG FiII.E" 01, DKV 21 COPIES LlTTR ENCl 1.1 1 1 1 1 1 1 1 1 1.1 1"-1 1 1 l.1 1 1 1.RECIPIENT ID, CODE/NAHEl YOUNGBLOODrB'5 LiYNCHeD~07 AEOD 18 D/DIR HUii F'ACii 5 EQUIP QUALl BR1.1 I&EI 09 HP A.20 OELD'1 QA BR 14 RUTHERFORDErJ.

IK COPIES LiTTR ENCl)1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 EXTERNALt:

ACRS NSIC'6 08 16 16 1: 1 LPDR.03 1 1 TOTALS NUHBER OFI COPiiKS RKQUIRED: LiTTR ENCLl 0 r ,1 I W wl Washington Public Power.Supply, System A JOINT OPERATING AG)PCY-P.O.BOX 966-'000 GEO.WASHINGTON WAY RICHLANO, WASHINGTON 99352 PHONE'I509I 372.5000 Docket.No.50.-39T November 26,.1980 G02-80-271'I Hr;.R'.H"Ehgelken:..

Director" Nucl'ear, Regulatory Commission Regi'on V'uite, 202, Walnut Creek.Plaza 1900 N.Cal'ifornia.

Blvd.Wal nut Creek,.CA'.94596

Subject:

.WPPSS NUCLEAR'ROJECT'O..

2 DOCKET'O..50-39T, CPPR-93 REPORTABLE DEFICIENCY

-10CFR50.55 e

Reference:

(a).Telecon.(A2-80-309 dated 8/20/80,

Subject:

Notification:

of Reportable-10CFR50.55(e)(b): G02-80-'08.'ated-9/19/80,

Subject:

.Reportabl'e Deficiency

'I

Dear Hr.Engelken:

In accordance.

with the, provisions of lOCFR50.55(e), your staff was informed.by references (a)and.(b)of a, reportable deficiency relative to.-sway brace brackets.Attached is our follow-up report which provides the status of the program initiated to resolve this deficiency.

A final report will be-submitted, when-the program is completed'nd evaluated.

II~H&4J Vv)P), UJ<oe gI 0~t t Please: contact us if you have.additional questions..

Very truly yours;RGM/RPS/im.

Attachment cc: Mr.JR'ewi's'Pk,w/1.

Mr'..ND, Lewis,, EFSEC,,'Olympiat Mr.;.RE:: Snaith, B&R'w/1.~Mr:., V;.Stello,.NRC.w/1'r;RD Toth,, NRC.'w/,1 Mr;JJ'erderber., B&R" w/I.Mr;B..Wood, NVS;Corp.w/1 WNP-Z.Files I 4~e w/1 R'.MATLOCK WNP-2.Pr ogram Director

Attachment.

REPVPf'ABLE DEFICIENCY AND CORRECTIVF RPFION: Page.1 of'2 WPPSS NUCLEAR" PROJECT.'O':

SWAY=BRACE BRACKET'S'S-1'42,.

MANUFACTUREDt BY POWER'.PIPING;CO;" P OR WELDMENT..UNDERSI D.ELDS.'LACK OF FUSION}'ASHINGTON PUBLIC POWER': SUPPLY SYSTEM'OCKET NO'.-50-'.397 LICENSE: NO.'-CPPR-93 Descri tion of.Deficienc It has:, been determined.

that;standardy weld'abricated beam attachments

'that are used in-rigid;sway..brace assemblies, were.supplied with welds smal'ler than the, sizes: required.by: ASME.SectionT II'I'DZV..

1,, Mandatory Appendix AIIL'able::XIII.-

1740:.1: (Mfnten.1073:Addhnda)...j These weldments~', were obseryedl tol:lieve.

undersi'ted,.

ftllet wel'ds and.exhibitedpoor weld: qua1ity...

Using.ASME:

Cbdei A'1:lowables, an.analysfs.has.determined'.

that.a design'deficie'ncy exists.for'hese" brackets;when-loadsa ares appl-'ied; at: an: angle.greater than:15 off the.perpendicular., Safet Si ni fi'cance" t Failure.of these: beam attachments-woul'd.render the rigid sway.brace ineffec:-tive and: coul'd.result:

in piping;system failure-.This woul'd adversely-affect the safe: operation of the--plant: and: personnel'afety..

Corrective Acti'on-A':prel'iminary test: of.the-size..15 bracket.was: performed on October 24;1980.The;-primary purpose-of'hi's-..

test.was;to.verify-the-test apparatus-and.procedure.

that will'e.used..in'-an overal'1.'.

test programi to: demonstrate by proof load tests that the.brackets.are.adequate;-

for the intended.service.During this.preliminary test" of'wenty.(20);size*15;: brackets, 19..of.-20'.-satisfactorily passed.the proof load.'equirements of'F-3233;.

Metal,l'ographic:

examination-has.been performed on.the welds of-randomly sel'ected-brackets of varying sizes.This evaluation con'-firmed'he existance'of undersized welds and also identified, various'eld.

defects (e.,gack.oftfusion,, poor penetiati'on)., An in-plant inspection by qualified welding engineers.

of all brackets was;in-itiated on November 4,, 1980, and, is complete.as=of this date.The intent of'this inspection was.to establish weld.sizes visual defect distribution, angular load position,.

and to establish the basis for-selection of test samples.Pre-liminary results indicate that undersize-weldments of generally poor weld quality exist.A test.program will be.initiated approximately December 12, 1980 to proof test representative samples in accordance with NF-3233.The process to select samples for the test program will be.determined by consideration of the following:

a)Selection by minimum size welds determined by field inspection.

This selection for a statistical evaluation would be considered conservative-ly biased.

Docket Ho.50-397 GQ-80-271-2-Page 2 of 2 b)Selection.

by visual inspection to.identify poor quality of'eldments..

This selection for a." statistical evaluation would be considered conservatively biased;The random.variable-in this selection process=wi'll be the fusion of the, weldments.

and.its quality, which is not visible during inspection.

The sample.size will be-sufficient.

to insure that.the brackets tested will be: representative of brackets of minimum quality.The design of the test fixture, due to a, predetermined; angular load,.will induce.a maximum stress condition in-the bracket weldment.If any brackets fail to meet the oroof load, the results wilT be reported, in a statistical format with the possibility of the.following.

actions: a)>>If'he.,results afithe.'est:

program indicate an insignificant,'ailure.

rate~, the.brackets, even with.the undersize weld andi gerrera1lTy poor..weld!

qual',ity,, wiTT be consideredl adequate for their intendedi senvice~.b)If-the results.of'he test program indicate-a significant failure rate a: new derated'oad capacity will be used Oerating may be applied to the load.rating or by limiting'he angle at which the load is-applied..c)When a support.is defined to be deficient in accordance with the test derated.capacity,, the bracket will be repaired or replaced.A final report.or an interim report will be;provided by february 2, 1981.