ML20210B359

Forwards Request for Addl Info Re Elimination of Arbitrary Intermediate Pipe Breaks.Response Requested within 30 Days of Ltr Receipt

ML20210B359
Person / Time
Site:	Comanche Peak
Issue date:	09/11/1986
From:	Noonan V Office of Nuclear Reactor Regulation
To:	Counsil W TEXAS UTILITIES ELECTRIC CO. (TU ELECTRIC)
References
NUDOCS 8609180052
Download: ML20210B359 (6)

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11 SEP 1906 Docket Nos.: 50-445 and 50-446 Mr. William G. Counsil-Executive Vice President' Texas Utilities Generating Company Skyway Tower, l..B. 81 400 North Olive Street-Dallas, Texas' 75201

SUBJECT:

ARBITRARY INTERMEDIATE PIPE BREAKS In reviewing your letter of July 29, 1986 in which you provided responses to staff questions concerning the elimination of arbitrary intermediate pipe breaks, we have determined that additional information is required to complete our review. The information requested is identified in the enclosure.

You are requested to respond within 30 days of receipt of this letter.

l Vincent S. Noonan, Director PWR Project Directorate No. 5 Division of PWR l.icensing-A

Enclosure:

Request for Additional Information cc: See next pago ,

interral copies A. Vietti-Cook G. Bagchi C. Tranwell D. Terao V. Noonan R. Ballard L. Shao J. Calvo Distribution i6 8. Grimes NRC PDR J. Partlow l.ocal PDR N. Thompson PDf5 R/F C. Trammell V. S. Noonan M. Rushbrook OEl.D ACRS (1 1 E. Jo dan fD DIR:PD#5 U ansnell:ss VSNoonan 9g/86 9/ /86 h 8609180052 860911 PDR A

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Docket Nos.: 50-445 and 50-446 Mr. William G. Counsil Executive Vice President Texas Utilities Generating Company

, Skyway Tower, l.B. 81 400 North Olive Street Dallas, Texas 7520I

SUBJECT:

ARBITRARY INTERMEDIATE PIPE BREAKS In reviewing your letter of July 29, 1986 in which you provided responses to staff questions concerning the elimination of arbitrary intermediate pipe breaks, we have determined that addittenal information is required to complete our review. The information requested is identified in the enclosure.

You are requested to respond within 30 days of receipt of this letter.

/

V . o n or Project frect rate No. 5 Division of WR licensing-A

Enclosure:

Request for Additional Information ec: See next page l

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q W. G. Counsil Comanche Peak Steam Electric Station Texas Utilities Generating Company Units 1 and 2 cc:

Nicholas S. Reynolds, Esq. Resident Inspector / Comanche Peak Bishop,l.iberman, Cook, Steam Electric Station Purcell & Reynolds- c/o U.S. Nuclear Regulatory Ccmission 1200 Seventeenth Street, NW P. O. Box 38 Washington, D.C. 20036 Glen Rose, Texas 76043 Robert A. Wooldridge, Esq. Regional Administrator, Region IV Worsham, Forsythe, Sampels & U.S. Nuclear Regulatory Comission Wooldridge 611 Ryan Plaza Drive, Suite 1000 2001 Bryan Tower, Suite 2500 Arlington, Texas 76011 Dallas, Texas 75201 lanny A. Sinkin -

Mr. Homer C. Schmidt Christic Institute Manager - Nuclear Services 1324 North Capitol Street Texas Utilities Generating Company Washington, D.C. 20002 Skyway Tower -

400 North Olive Street, l B. 81 Ms. Billie Pirner Garde Dallas, Texas 75201 Citizens Clinic Director Governnent Accountability Pro. ject Mr. Robert E. Ballard, Jr. 1555 Connecticut Avenue, N.W.

Director of Projects Suite 202 Gibbs and Hill, Inc. Washington, D.C. 20009 11 Pen Plaza New York, New York 10001 David R. Pigott, Esq.

Orrick, Herrington & Sutcliffe

'600 Montgomery Street Mr. R. S. Howard San Francisco, California 94111 Westinghouse Electric Corporation P. O. Box 355 Anthony Z. Roisman, Esq.

Pittsburgh, Pennsylvania 15230 Trial I.awyers for Public Justice

. 2000 P. Street, NW Repea Hicks, Esq. Suite 611 Assistant Attorney General Washington, D.C. 20036 Environmental Protection Division P. 0.-8ox 12548, Capitol Station hancy E. Wiegers Austin, Texas 78711 Spiegel & McDiarmed 1350 New York Avenue, NW Mrs. Juanita Ellis, President Washington, D.C. 20005-4798 Citizens Association for Sound Ener0y 1426 South Polk Roy P. I.essy, Jr.

Dallas, Texas 75224 Wright & Talisman, P. C.

1050 Seventeer.th Street, NW Ms. Nancy H. Williams Suite 600 CYGNA Washington, D.C. 20036-5566 101 California Street San Francisco, California 94111

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Q Texas Utilities Electric Company Comenche Peak Electric Station Units I and 2 cc:

Resident inspector - Comanche Peak c/o U.S. Nuclear Regulatory Comissico P. O. Box 1029 Granbury, Texas 76048 Mr. John W. Beck Vice President Texas Utilities Generating Company Skyway Tower g 400 N. Olive Street, LB#81 Dallas, Texas 75201 ,

Mr. Jack Redding i licensing Texas Utilities Generating Company 4901 Fairmont Avenue Bethesda, Maryland 20814 William A. Burchette, Esq.

Counsel for Tex-l.a Electric Cooperative of Texas Heron, Burchette, Ruckert & Rothwell Suite 700 4 1025 Thomas Jefferson Street, NW Washington, D.C. 20007 i GDS Associates, Inc.

2525 Cumberland Parkway Suite 450 Atlanta, Georgia 30339 Administrative Judge Peter Bloch U.S. Nuclear Regulatory Commission Washington 0.C. 70555 i Elizabeth B. Johnson Administrative Judge Oak Ridge National I.aboratory P. O. Box X, Building 3500 Oak RMge, Tennessee 37830 Dr. Kenneth A. McCollom 1107 West Knapp Stillwater, Oklahoma 74075 Dr. Walter F. Jordan 881 Outer Drive Oak Ridge, Tennessee 37830 J

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g Enclosure '

210.9 Your response to Q 210.1 in your letter dated July 29, 1986 concerning the elimination of arbitrary intemdiate pipe brea.ks reyires additional info'emation. The need exists to demonstrate an eq'dvalent levei of safety to that provided in the Standard #eview Flan in the evaluation of k, poteelttal p!pe breaks in the vicicity of welded attachner.ts to piping. It is requested that more detailed infer'naticn be prov(ded concerniGg the use of welded attachments 1:1 the vicinity of those arbitrary intehnediate breaks to be elVrinated. Specifically, the staff requests that you provide the follcAnp informatit;n:

l a. Identify all weided piping attachments within five pipe diameters of the arbitracy internediate break to be elimir.ated.

j b, Fcr each welded attachment, identified ir. (a) above, preride the systein, strest package number, piping ise'netric dr& wing r.umbe, pipe support number, building location, and pipe stress lev 61s at the welded attachwent, t

c. Provide e sketch of the piping configuration in the aten i1 ear tSe wided attachaent and arbitrary intermediate treak locatQn.

d. Describe the type of wided attachment in.olved (e.g. lu,q, sta chinn, trunnion) and provide a sketch of the welded dttachment and support JrrangeDent.

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e. For those syster.s susceptible to large, unanticipeted dynanic loads (e.g. , main steam and feedyater), provide an essessmetit of the veak link in the pining tc pipe support load path, i

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210.10 Your resperse to Q 210.2 in your letter dated July '29,1986 concerning arbitrary intermediate pipe breaks is not acceptable. The stress reduction j

factor provided in the ASVE Code Section III for therral stress cycles greater than 7000 cycles applies to general bending stresses only. The staff concern is related to the potential fer localized bending and thermal gradient stresses which may occur in the main steam and feedwater systems at locations of welded attachments. Provide a worst-case assessment of the potential fatigue effects at the welded piping attachments in the main steam and feedwater systems due to local bending and thermal gradient stresses.

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