ML19318D238

Interim Rept of Significant Const Deficiency 17 Re Base Metal Defects in Main Steam & Feedwater Containment Penetration Anchors.Evaluation Underway to Establish Repair Techniques.Final Rept Will Be Forwarded by 810301

ML19318D238
Person / Time
Site:	Waterford
Issue date:	07/02/1980
From:	Crnich J, Hart J, Milhiser R LOUISIANA POWER & LIGHT CO.
To:
Shared Package
ML19318D236	List: ML19318D235 ML19318D238
References
NUDOCS 8007080239
Download: ML19318D238 (3)

Text

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O LOUISIANA POWER & LIGF.T COMPANY ..

WATERFORD SES L71T NO. 3 Interim Report of Significant Construction Deficiency No. 17 Base Metal Defects in Main Steam and Feedwater Containment Penetration Anchors ,

Reviewed by,_

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rnica - Site Manager A5 ate '

Reviewed by _

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'R. J. Milhisef - Profect Superintendeng Da(e

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Reviewed by MM

. Project Lice ing Engineer

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. Reviewed by i Z R. A. Hartnett - Q. A. Site Supervisor

['8 Date

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July 1, 1980 l

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• INTERIM REPORT SIGNIFICANT CONSTRUCTION DEFICIENCY NO.17

" BASE METAL DEFECTS IN MAIN STEAM AND FEEDWATER CONTAINMENT PENETRATION ANCHORS" INTRODUCTION This report is submitted pursuant to 10CFR50:55(e) and 10CFR21. It describes deficiencies in the base metal of the plates in the Main Steam and Feedwater Anchors.

_ DESCRIPTION Tompkins-Beckwith, the process piping installation contractor, has been attempt-ing to weld 2-3/4" thick bearing lugs to the base and legs of the No. 1 and No.

2 Main Steam Penetration Anchors. ' Extensive cracking has occurred in the base plates. Six lugs have been welded on the feedwater No. 3 penetration anchor and ,

visible cracking has been encountered. The base material ASTM A-36 may be sus- '

ceptible to lamellar tearing and there is concern that tearing below the surface may have occurred. Currently, all work is stopped on these anchors and three nonconformances (W3-1718, W3-1723, W3-2083) have been generated to document the visible cracks. In some instances the base material has been previously repaired due to cracking discovered in the area of Peden (supplier) shop welds. Addition-ally, proble=s have been encountered concerning distortion of the lugs as they cool down. The lugs tend to bend away from the fluted head, thus eliminating full

, bearing contact.

SAFETY IMPLICATIONS _

If this deficiency is lef t uncorrected, in the event of a pipe rupture, the anchors may not- be adequate to withstand the. application of the full loads generated. It is therefore possible for an anchor to fail, perhaps resulting in subsequent pipe ruptures. Thus, failure to correct this deficiency could invalidate assumptions made in_the FSAR dealing with Pipe Rupture Analysis.

I CORRECTIVE ACTION Evaluation of this condition is currently under way and at this time we are initiat-ing the following course of action to determine the extent of the problem, establish j repair techniques and identify procedures to prevent recurrence:

(1) . Establish requirements for an NDE program in order to evaluate the extent of the cracking in the' vicinity of the lugs already welded to a base or leg.

(2)' Review the Peden (supplier) base metal repair procedures to determine the extent of repair already -performed cnt the base metal.

a.. i

. t (3) Establish a repair procedure and the inspecticn criteria to be used in ,

repairing existing cracks.

(4) Review the Tompkins-Beckwith weld procedures to determine what changes can be made to minimize further cracking.

'(5) Review the present desi';n of the anchors to investigate the feasibility of making modifications which would reduce the amount of welding currently required.

(6) Establish a procedure for removing base metal in the vicinity of future welds and replace it with sound weld metal. The extent of this effort can be established from the data accumulated in i=plementing Items 1 through .3.

The last three items are preventative measures which must be evaluated concurrently to establish an optimum fix. The other alternative is to replace the existing base metal with another material which would be less susceptible to lamellar tearing.

Supplementary Interim Reports will be issued as new data, findings and repair pro-cedures are identified.

The results of the above evaluations and the corrective actions implemented will be included in the Final Report, due to the USNRC on or before March 1,1981.

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