ML20086F110

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Interim Significant Deficiency Rept 2 Re Structural Steel Defects.Initially Reported on 770111.Caused by Improper Flange Trimming Operations,Failure to Properly Prepare Cope for Repair Welding & Deficient Repair Welding
ML20086F110
Person / Time
Site: Peach Bottom, Limerick, 05000000
Issue date: 04/01/1977
From: Boyer V
PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC
To: James O'Reilly
NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML20086F058 List:
References
10CFR-050.55E, 10CFR-50.55E, 2, NUDOCS 8312130037
Download: ML20086F110 (5)
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k)lLADELPHIA LLECTRIC CUMPANY J J8 B /pg 2301 M ARKET STREET PHIL A DELPill A. PA 19101 '

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Mr. J. P. O'Reilly, Director, Region I office of Inupection and Enforcement U.S. Nuclear Regulatory Conniasion 631 Park Avenue King of Prunnin, Pennnylvania 19406

Subject:

Significant neficiency Report Structural Steel Defecta -

Supplementary Interim Report I.Lmerick Generating Station - Units 1 6 2 NRC Conotruction Permit Mos. CPPR-106, 107

Reference:

V.S. Boyer Letter to USNRC (Dr. E. Volgonau) dated January 11, 1977-Interim Peport SDR #2 File: QUAL 2-10-2, SDR #2 Dest Mr. O'Reilly:

Pleane find attached a supplementary interin report concerning the discovery of defects in struct.2ral steel manbera located in the Unit 1 and 2 reactor buildings.

We had expected to submit our final report on this incident by April 1, 1977, however, an detailed in the attachment, further innpcetion/ review is necessary prior to issuance of the final report.

The expected submittal date for the final report in July 1, 1977.

Sincerely, f., ,

f 7 S. BoycF cc: Dr. Ernst Volgenau, USNRC l 96A as12130037 771005 PDR ADOCK 03000277 S pop o

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{ STT:UCTURAL 3rE13. DEFECTS 1

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. . ! .':'IC r.71. C"! !11 M AIS) 0.7iiI-107 i iTN.TO T.it aluce thu hvca timt: a on ot.ruct urcl steel girdur and Loam cracl ing la not yet cw: A c tc, thJr b im u .d en a cupidxt. ental interim rciert for the deficiency, b eldition to the girder dcfects, the ".rta of concern has been c:gandcd to hv'loce cepec in rollcl l'ecr., and o&r r.cnual-veld-r e:l ater.

repects of fr.tr.ic atten.

1!:e pt ogr:v c u f inve::f,igatien and icpair referred t-o hi the fir st interb reiert, are r.cnvly cotrlet.e mM u131. b" discunced in the dotnile of th!r report.

2. IX M illl'TI G: ( F P_HCliJiGI a) Chronology DuriInt the inspections of plato girdero nn apparent poor veld repair wac :inted on the cored area of a rollod hen ~. Subsequent.ly, this cr.d other re31ed 1+ ms 'ero radLc,"ynphed. The reculta rovraled t!at ome copes Jr 2 011cd m.micra choved repai nelda Ubich vorc rejectchlc per 2 3 D1.1 r cceptance criteria. hediography clso identif,ted stacked subsurfaco discenthiuitica. Additional imratigative programs toro inctitut.ed on a result, and the txistenec of ncn-confoming tranval struct, ural fillet velda wan discovered.

An audit at the Vendor's chop uns ccnduct,cd r.nd no .2 rccult a "Lold" on further fabricatica and chipping vac put into effect,. The

" hold' vac relonced folleving resciution of the audit findings.

b) Defects end icficiencies re'.er,1 t;1+3 of fcbrientien relst.ed defects and trold defic 3cnclec hvc been diccovere 1 in ro13 ed learn, in addition to those originally found in girders:

1) Terfa at cope areas ucre acc=panied 1g occasional cracks in the heat affected :'one.
2) Udelaimd f flic t vel.dn t.t cmmection c":;1es.

I:en-destructive and vicual examhntion Irugrms have been uced to detect and identify dafects and deficiencies.

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( *1 ) 701N rr U1_U JTO-C7 t. tb' O 3Dge G c f Uelded ple to girdorc to 1.hcir required 3 rn;t.h, no th. t, copj'm of 11.c flangen 1:131 not i f, . ., r ,n

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(b) A revicad proceduro for the coping of rolled cectiona and necccaary repairs as required has alco been initiated by tbc Vendor.

3) Hett :rcthods of centro 131ng end inspectinr: mlding and vold repaire ucro ectnh1Jrbed.

h) The f abricaUo t nnd -Lipp5ng hold urs rn auJ baced on the re nel u t ion e.' r"!!t. findinea.

(c) Supplcmntf. Ecchtel Increction A now cupplemental Pcchtel shop inspection plan has been developed mi put into arrect. Thin 4ta13 c:1 p3 nn hnn crcin1 eghario en tho innpcation and survoillance of cerca, vold repaire, and ennual volds.

(d) Ecpair procedurca Procedures have been domloped by the Vendor fer uco in the repair of rolled bear.s and girders.

(c) Construction I.imits It her Leca datomined by Pechtel Frgin:crjng that tho defecta due to improrer febrication jn the f.tructural steel do not conctitute any rick to the safety of the existing structure and ccnstructicu activitics ray proceed. IIcuever, presently acccasibic crccted alcol vill not be concreto encased, ner will any atac1 delivered to the cito prior to Pecember 1976, be crected, without a full viou11 inspection and radiographic excminatien of cuapcot arces. I]oficiencies found cro either rcraired or evalusted for neceptability by Pechtel Engincering.

(f) Sovaral courcco of action cro boing censichred for structural ctcel presently Annecc331ble for vinual incycetion:

1) Analyticel Frneture Techanica Analycic for cope defectn.

This type of analysis, using defect since, estimates of material propertica and working strcccco vill determine a critice3. crack cizo which vill be used in oveluating the structural safety of the structure.

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2) Auxiliary Supporte x,

Additional connections to provids support in such a way that., . ,.

. propagation of any discontinuities or other wld doficiencies

' would not, affect the structural' intogrity of the structure.

/3)';J Btpose all innecessible steol' for inspection.' This would '"

' involvo the removal of concreto, robar, and any other obstructiona.

9.0 CONCLUSION

a) Co:qRete inspection nnd rorair of defect.s in corc3 of dateEgirders I -

delivered bofero Lecember 1976, will assure their docign capacity. .

- The restoration un1 bo demonstrated by the radiographic omination dons.,for . final acceptance.. IIepairo_ arc ecsontially. coz::plete.

b) Fnlot wld simo aJcoptanco for plate girders and rolled lent:s is under i investigation.

c) As cutlined above it will be der.onstrated analytically, by use of i . , . , .

, _ auxiliary supports, or by an inspection-and-repair. program, that the. , ,

design capacity of rolled sections delivered beforo December 1976, will ,, ,

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not be ecmpromised by the defects. '

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d)' ' Upon eccinetion cf all' investigations ~a' final roport v311'be issued T

' aumarizing the resulta et all investigativo programs and otudica.

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