ML19309G812

Forwards Further Info Re IE Insp Rept 50-370/80-01,in Response to NRC 800403 Conference.Weld Buildup of Undersized Welds Underway.Welds Will Be Pressure Tested at Initial test.Thirty-nine Weld Flanges Rejected as Undersized

ML19309G812
Person / Time
Site:	Mcguire, McGuire
Issue date:	04/10/1980
From:	Parker W DUKE POWER CO.
To:	James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19309G768	List: ML19309G767 ML19309G771 ML19309G806 ML19309G809 ML19309G812
References
NUDOCS 8005070613
Download: ML19309G812 (2)

Text

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'O o u ia c r o w ia < c o. sit u .s v 8005070//3 l'oweit itetunxn J.

4:2:J Mot:rn Citituru Ss uut.r. Cuauun t. N. (* utra m

..w m o r.n.e c a. s a. April-10, 1980

..r r Fat s. a f *s t

s. .. a.c o .: ,as it.t*=eose t.- Aa g a 7Q 4 srs.*oss Mr. James P. O'Reilly, Director U. S. !;uclear Regulatory Commission Reg, ion 11 101 Marietta Street, N.W., Suite 3100 '

Atlanta, Georgia 30303

Subject:

McGuire Nuclear Station Docket No. 50-370 Re: RII: EllC 50-370/80-01

Dear Mr. O'Reilly:

As requested by Mr. Milt liunt and Mr. Ed Cirard of your Staff in a conference ca)) held oi April 1, 1930 please find att.iched l'urtlier information in regard to item A of the subject inspection report. This letter supplements'my responses of March 5, 1980 and March 27, 1980.

Very truly yours,

((Atlip/

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L ;r . .s t. (~< '

NC y .c. <

- William O. Parker, Jr. ,g/ M',' ,

1.JB:scs Attachment

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a MCCUIRE NUCLEAR STATION l Supplemental Response To IE Inspection Report 50-370/80-01 April 11, 1980 RESPOSSE In regard to the inspection of samples of flanges and fittings referred to in my 3

responses of March 5, 1980 and March 27, 1980,. area (b) should be corrected to read, " Socket veld flanges using schedule 40 or 1 css pipe for weld size."

The corrective action taken for welds on McGuire Unit 2 which were below the -

i minimum requirements is updated as follows: The weld buildup of undersi:cd

' welds is underway and is scheduled to be completed by May 16, 1980. The pressure testing of these buildup areas will occur when the systems are scheduled for their initial test. These tests, dependent upon the' system, occur .

between May 1, 1980 and February 1, 1981.

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' The following corrective action has been taken- for welds on McGuire Unit 1. The results of the Unit 2 inspection indicated a need to inspect the weld size on all socket weld flanges on pipe of greater than schedule 40 thickness. The Unit 2 inspection indicated no need for concern for regular socket weld fittings and for flanges on pipe of schedule 40 or less thickness.

All of the socket weld flanges on McGuire Unit 1 on greater than schedule 40 pipe have been checked. A total of 125 flandes were checked; thirty-nine of these welds were rej ec ted . The rejected welds were undersized up 0.201 inches with

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most of the welds being undersized approxinately 0.050 inches. The weld buildup

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on these undersized velds will be completed by May 9, 1980. Pressure testing of these areas will occur, dependent upon the system,~between May 1, 1980 and May 16, j 1950.

This incident occurred due to personnel error. In the transfer of information i

from the ASME Code to the Duke Power Process control Manual the wcld size 1.4T was incorrectly transferred as 1 1/4T.

The Procesu Control Manual was revised on 3

January id, 1930 to correct these instructions. Correct weld size information for all types of Code socket welds have been provided to. Quality Assurance inspectors and craftsman. A review of the process used to transfer information to' inspectors and craft.sman indicates that this processLiu adequare and that no action needs to

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{ be taken in this area.

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