ML20099E052

Interim Deficiency Rept 82-10 Re Structural Steel Installation Insp Records.Inaccessible Connections W/ Inadequate Records Will Be Repaired or Upgraded.Next Rept Will Be Submitted by 850115

ML20099E052
Person / Time
Site:	Braidwood
Issue date:	11/02/1984
From:	Danni Smith COMMONWEALTH EDISON CO.
To:	James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
References
82-10, 9406N, NUDOCS 8411210077
Download: ML20099E052 (3)

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. Commonwealth Edison:-

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l Addrrss Reply tz Fost Offic3 80x 767,

( j/ Chicago. Illinois 60690.

November 2, 1984 Mr. James G."Keppler-Regional Administrator-

.U.S.nNuclear Regulatory Commission LRegion III-799 Roosevelt ~ Road Glen Ellyn,' Illinois 60137-

Subject:

- ~ Braidwood Station Units 1 ~& 2 10 CFR 50.55(e) 82-10 Interim Report-Structural Steel' Installation Records

-NRC Docket Nos. 50-456/457 References (a):

T. R..Tramm letter to J. G. Keppler dated: December 30, 1982 (b):

E.-D.

Swartz letter to J. G. Keppler dated

-July 1,-1983 (c):

E. D. Swartz letter to J. G. Keppler dated May 7,-1984 (d):

E. D. Swartz letter to J. G. Keppler

' dated July 3, 1984-

Dear Mr. Keppler:

References (a), (b),- (c), and (d) provided information concerning a deficiency repertable pursuant to CFR 50.55(e) regarding structural steel installation inspection records at our i

j' for completion of the inspection program and issuance of a final Braidwood Station.'

In Reference (d), we indicated our expectations report by October 1, 1984.

The purpose of this letter is to advise your office that this reinspection work is still in progress, provide an updated status of our activities in this matter, and i

provide a description of the discrepancies and how ' they are being processed by Commonwealth Edison Company.

Status of Resolution All accessible welded and bolted connections which had missing QC inspection records have been either QC inspected and accepted, or have been repaired and QC accepted.

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_[.sTheireviiwfo'finstal1$ticnlinspectionl records 1has, Jidentified?af total 1of-2436 inaccessible welded :and bolted.

iconnections;withimissingfinspectionl records.. ; Ai sample 'of 180

-inaccessible;boltediand1 welded 1connectionsihave;been inspected and the_-inspectionfreports'areastillibeing: evaluated by1Sargenti&-

Lundy. cThentypes offdiscrepancies1found duringitheisample.

inspection: program-include:"-(1) AWS weld quality deficienciesisuch-i astoverlap,; undercut,' included' slag,-fit-up gaps,Jundersize: welds;:

(2)11nc~omplete: welds; (3)nbolting; deficiencies:suchlas bolt

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locations in the: slots and widthiof slots;'. ;(4): member'and L

. conn'ec tionl angle ' size 1 changes ;

andi(5)jexpansionianchorcembedment_

lengths..

?While' performing'the? sample inspections,Jittwas al'sofnoted; thattsome shopswelds on the blockwall; columns;had :some of, the same;

. types ofEweld_ discrepancies. - With. respect tosshop, welds, we plan'to.

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1 conduct the necessary-: inspections,^ perform!an engineering. evaluation i

1 to 'determineithe significance of.!the discrepancies,' and' perform any

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necessaryJrepairs: dependent.:on the engineeringtreview.results.>

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'Sargent'& Lundy's_ evaluation of the sample of _180

-inspection-reports of! field installations is continuing.

To-date, t

none of the-inspected connections have been determined-to have discrepancies.with~ design significance (i.e., design-margin _ remains i-within specified design-limits _and code allowable stresses).

Thel evaluation for design significance is~ anticipated to be' completed by -

November-15,r1984.

The basis for the loads used in this evaluation at:Braidwood has been the. Byron final attachment ~ loads. - Per,our.

response to'NRC.I.E.Bulletin 80-11, the' final load check is

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performed for block walls using the final attachment-loads.

Due to the ' construction status a: Braidwood, the final.attac" ment loads are not yet available.

Corrective Action.

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Commonwealth Edison Company has decided to repair or upgrade and inspect all. inaccessible connections with' inadequate 2

records.

One of. the reasons for this decision is that while the.

Byron loads;were used in the evaluation for design significance, the J'

actual Braidwood loads, when they become available near completion of construction, may in some cases be greater than the Byron i

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loadings.

From a construction standpoint, it is more prudent to i

make modifications now, and upgrade the walls to restore and/or i

_ increase-design margins, rather than making modifications shortly beforeEfuel load when the actual Braidwood loadings become available.

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_.;Wealso;plantoconducknecessaryinspections, engineering.

evaluations'and'any required: repairs of; inaccessible:and accessible block wall:: column = shop welds.- Lastly,-~there are170' miscellaneous

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structural 1 members' embedded in1 concrete.-,These: members.are'

currentlylbeing evaluated for inclusion 11ni the rework / reinspection:

. programs /We will advise you of their. disposition in our next status ireport.

.lThe' procedure' to-perform theiinspections, repairs and/or modifications of the field installations :withoutJinspection 2 records 7

is expected to befapproved by. November 19;.1984. cActualEphysicali

workgwillithen' start and is. expected.toLeontinue.until' August 1, 1985. - Some 'of the-modifications"to~ restore _the design.. margin ofa Estructures with uninspected

connections may'be made externally.to) the block wall,-if' physical restrictions 3 prevent inspecting and/or

modifying. existing connections._ If restrictions also?make external modifications. difficult:tolimplement,' additional engineeringj analysesLwill'be performed to ensure; adequate design' margins... In

-the event thathexternal'-modificationscor. engineering analyses are-used,'the existing unin'spected connection will be ignored in the-modificationidesign or engineering. analyses..

We expect to submit an interim report updating 1the status-of the inspection / rework program 'by January' 15,--1985.

'If there are.

questions in.this matter,'please contact this office.

.Verytrulyyfurs, 1

ulc]LL.

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mith Nuclear Licensing Administrator cc: - NRC Resident Inspector - Braidwood Director -of Inspection and Enforcement U.S. Nuclear Regulatory Commission Washington, D.C. 20555 9406N Y-J ew

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