ML19345C823

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Informs of Intent to Use ASME Code Case N-275, Repair of Welds,Section Iii,Div 1, Approved 800515,for Utilization of Alternate Rules for Examination Prepared for Repair of Welds.Requests Acknowledgement of Acceptability
ML19345C823
Person / Time
Site: Byron, Braidwood  Constellation icon.png
Issue date: 11/18/1980
From: Tramm T
COMMONWEALTH EDISON CO.
To: Varga S
Office of Nuclear Reactor Regulation
References
NUDOCS 8012080448
Download: ML19345C823 (2)


Text

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. November'l8,-1980 f5 "C3' ;32 2 G2s "ett U'M

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4tr. Steven'A. Varga, Chief- . 2 Ao un Light Water Reactors - Branch 3 QQ q, gG;

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. Division of Project Management U.S. Nuclear Regulatory. Commission Washington, DC 20555 4

Subject:

Byron-Station Units 1 and 2-Braidwood Station Units 1 and 2 Utilization of ASME Code Case N-275

.NRC Docket Nos. 50-454, 50-455, 50-456 and 50-457

Dear Mr.-Varga:

This is to inform you of the intent on the part of Common- alth Edison to make use of ASME Code Case N-275, " Repair of Welds,Section III, Division 1", approved May 15, 1980, to utilize

-alternate rules for examination of areas prepared for repair of welds. A copy .of the approved code case is attached.

This code case was reviewed and accepted without comment by an NRC representative to the ASME Council and we anticipate that the NRC Staff.will include it in the next revision of Regulatory Guide 1.84. Commonwealth Edison requests that the NRC Staff acknowledge acceptability of this Code Case for immediate use at Byron and Braidwood' Stations.

It is.our hope that this issue will be reviewed as soon as possible so that the Byron construction schedule is not adversely affected. Acceptance of this code case by early December will permit flushing of. certain relatively large lines. Should any questions exist, we request that a meeting be scheduled immediately.

so that we may address and resolve those concerns.

One-(l) signed original and thirty-nine (39) copies of this letter and the attachment are enclosed for.your.use.

Very truly yours, ff fM== -

T. R. Tramm Nuclear Licensing Administrator Pressurized Water Reactors o

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/[l 1 c2uA 8012080 M -

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.s CASE

/ . N-275 CASES OF ASME BOILER AND FRESSURE VESSELCODE MeetingofMarch 7,1980 Approved by Council, May IS,1980

- This Case shallexpire on May IS,1983 uni. ss previously annulled or reaffirmed.

Case N-275 ments of NB/NC/ND/NE/NF/NG4453.1 for Section 111,.

Repairof Welds Division I construction:

Section ill, Division 1 (1) Unacceptal>le indications shall lie removed by -

. mechanical means or by therrnal gonging methods.

. Inquiry: %. hat alternative rules.may be used for the Tim m yirdiated for rqiair sliall lie examined by examination of the area prepared for repair of welds in the liquid penetrant or magnetic particle method in heu of the requirements of NB/NC/ND/NE/NF/NG.

4481 for Section 111, Divismo 1 constniction where .rdance with NB/NC/ND/NF/NF/NG 5110 and s. hall meet the acceptance stamlardsof Nil /NG/ND/NF/NF/NG.

the full thickness of th' eweld is removed and where the 5300 except that the examination is not required where back side of the weld jomt assembly is not accessib!c for the full thickness of the wcld is removed and where the removal of examination materials?

Lack side of the wcldjoint assembly is not accessibic for Reply: It is the opinion of the Conunittee that the removal of examination materials.

following rules for the examination of the arca prepared (3) The completed wchl repair shall l>c examined in for repair of welds may be used in lieu of the rniuire. accordance with Nil /Nr/ND/NE/NF!NG-4453.4.

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