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 WASHINGTON PUBLIC POWER SUPPLY SYSTEM
To:	Engelken R 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 tirPPSS Nuclear Pr oject~ Unit,. 2i Nashington Public Powe 05000397 DOCKKtl'ACIL:50-397 AUTH'AHE, HE AUTHOR AFFiILrIATION HATLOCKER.G.. AashingtonI Pub.lic Power Supply System REC'IP ~ NAHE. RKCTIP1IE(4'T~ AFFILIATION ENGELKENER ~ , 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 COPIES RECIPIENT COPIES ID CODE'/N AHE i" LlTTR ENCl ID, CODE/NAHEl LiTTR ENCl)

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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 202, Walnut Creek. Plaza V'uite, 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 10CFR50.55(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.

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Please: contact us if you have. additional questions..

Very truly yours; R'. MATLOCK WNP-2. Pr ogram Director RGM/RPS/im.

I Attachment 4~

cc: Mr. JR'ewi's'Pk,w/1. e Mr'.. ND, Lewis,, EFSEC,,'Olympiat w/1 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

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 NO'.- 50-'.397 SYSTEM'OCKET 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.,g ack. 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 Page 2 of 2 GQ-80-271 b) Selection. by visual inspection to. identify poor quality This selection for a." statistical evaluation would of'eldments..

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 rate~, the. brackets, even with. the undersize weld andi insignificant,'ailure.

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.