ML20077D120

Informs That While Reviewing QA Documentation & Work Packages Provided by Dravo Util Constructors,Inc for Mark I, Penetration Welds Performed by Unqualified Welders.Ge NDT Personnel Will Examine Welds Beginning 830418

ML20077D120
Person / Time
Site:	Cooper
Issue date:	04/13/1983
From:	Pilant J NEBRASKA PUBLIC POWER DISTRICT
To:	Jay Collins NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
References
TAC-07934, TAC-7934, NUDOCS 8307260361
Download: ML20077D120 (2)

Text

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.. ;E Nebraska Public Power District ' "?Nbh fffbs*4""""

April 13, 1983 I'

Mr. John T. Collins ,

3 }!

Regional Administrator U.S. Nuclear Regulatory Commission -

APR 151983 .!

Region IV ,

611 Ryan Plaza, Suite 1000 L Uk Arlington, Texas 76011 }

Subject:

Mark I Modification /

Welds Performed by Unqualified Welders I)

Dear Mr. Collins:

In the course of reviewing the QA documentation and work packages provided by Dravo Utility Constructors Incorporated for the Mark I work that they did during 1982 and early 1983, we found that some penetration welds were done with unqualified welders. The evidence we found indicated that this may exist in more than one location so we instructed our contractor to come back, review their data, and in-form us of the areas affected. Subsequent to their review, which indicated a number of welds, we have performed an in depth review of the data and firA that an additional number of penetration welds were in fact done by welders that were only qualified for fillet welds.

These welds consist of full penetration, partial penetration, and flare bevel welds most of which are installed on Torus Attached Piping supports. A few welds are in the drywell and under the water line in the torus. We are also investigating a number of welds on the torus catwalks which since they are fillet welds to structural tubing become flare bevel welds. We expect the results of an engineering analysis to show that these welds need to only meet the requirements of a fillet weld and therefore expect to not require any additional work on them.

Upon review of the various codes and discussions with EDS Nuclear and General Electric, we have subsequently decided to use ultrasonic examination to examine the individual welds and determine the acceptability of the welds.

Qualified NUT personnel from General Electric will be on site beginning April 18, 1983 to examine the welds. If the results of the examinations indicate unacceptable welds, we will then repair the welds.

/ do 8307260361 830413 PDR ADOCK 05000298 P PDR

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~Mr. John T. Collins

. April 13, 1983

.Page Two

.We expect to complete this work by the end of the upcoming outage and will- forward a summary report to you af ter we have finished.

If you have any questions, please advise.-

Sincerely.

-: , W er-+-

ay . Pilant A

Division Manager of Licensing and Quality Assurance

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