ML20125C795

Ack Receipt of 850125 Request for Approval to Use ASME Code Cases N-397 & N-411 for Analysis of ASME Class 1,2 & 3 Piping.Use of Code Cases Acceptable Pending Implementation of Listed Items

ML20125C795
Person / Time
Site:	Comanche Peak
Issue date:	06/05/1985
From:	Noonan V NRC - COMANCHE PEAK PROJECT (TECHNICAL REVIEW TEAM)
To:	Spence M TEXAS UTILITIES ELECTRIC CO. (TU ELECTRIC)
References
NUDOCS 8506120161
Download: ML20125C795 (6)

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g UNITED STATES NUCLEAR REGULATORY COMMISSION y j WASHINGTON, D. C. 20555

% ,,,,,* JUN 0 51985 Docket Nos.: 50-445 and 50-446 l

l Mr. M. D. Spence i President

! Texas Utilities Generating Company 400 N. Olive Street Lock Box 81 Dallas, Texas 75201

Dear Mr. Spence:

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Subject:

Use of ASME Code Cases N-397 and N-411 for the Comanche Peak ~

Steam Electric Station (Units 1 and 2)

The NRC staff has received your letter of January 25, 1985, requesting approval to use ASME Code Cases N-397 and N-411 for the analysis of ASME Class 1, 2 and 3 piping in accordance with 10 CFR 50.55(a)(3). Code Case N-397 contains an alternative method to spectral broadening of the seismic accelerations used in the piping analysis. Code Case N-411 contains alter-native damping factors that may be used in lieu of values contained in Section III, Division I, Table N-1230-1 of the ASME Code.

Since your request for approval to use ASME Code Cases N-397 and N-411 was received when the design of Comanche Peak Units 1 and 2 is largely completed,

, provide the reasons and basis for requesting the revision to earlier design l commitments. Since there is extensive testimony by your representatives and the staff on the design of ASME Class 1, 2 and 3 piping, and on the use of Section III of the ASME Code for Comanche Peak, the staff requests that you

, perform a careful review of the hearing record to identify whether (and in i what manner) each of the request items may affect the earlier testimony before l the ASLB. In addition, the staff requests that you identify whether (and in what manner) the request items may relate to:

! (a) The Motions for Sumary Disposition submitted by TUGC0

concerning piping and pipe supports; l

! (b) Matters which were reviewed by Cygna in the Independent j Assessment Program; (c) The comments of the NRC's Technical Review Team; (d) The comments of the NRC's Special Review Team; l

(e) The comments of the NRC's Construction Appraisal Team.

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Mr. M. D. Spence With respect to your request, the NRC staff finds the use of these Code Cases acceptable provided the following items are implemented:

(a) Piping systems to which the two Code Cases are to be applied are identified in the FSAR; (b) For each of the systems identified in (a), describe whether the Code Cases are to be used for new analyses, for reconcilation work, or support optimization; (c) The Code Cases should be used only for piping systems analyzed by response spectrum methods and not those using time-history analysis methods; (d) Due to an increase in system flexibility, when the Code -

Cases are used, all predicted maximum displacements shall be checked for adequate clearance with adjacent structures, components, and equipment, and all mounted equipment shall be checked to assure that the increased motion is within the acceptance envelope; and that should the usage of these Code Cases result in removal of supports and restraints, the remaining supported piping' system shall be evaluated to assure that piping system stability is guaranteed for all operating modes.

(e) Piping system design specifications and required design documents shall be revised.

(f) The requirement in Welding Research Council Bulletin 300 in section entitled " Technical Position on Industry Practice" should be complied with.

Further, we request that you consider whether a Construction Permit amend-ment is necessary. If not, please provide your rationale.

Should there be further questions concerning this subject, please contact the Project Manager.

Sincerely, J

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n, Director f C anch Peak Project Divisio of Licensing cc: See next page .

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COMANCHE PEAK JUN 0 51985 Mr. M. D. Spence President Texas Utilities Generating Company 400 N. Olive St., L.B. 81 Dallas, Texas 75201 cc: Nicholas S. Reynolds, Esq. Mr. H. Shannon Phillips Bishop, Liberman, Cook, Resident Inspector / Comanche Peak Purcell & Reynolds Nuclear Power Station 1200 Seventeenth Street, N. W. c/o U. S. Nuclear Regulatory Washington, D. C. 20036 Commission P. O. Box 38 Robert A. Wooldridge, Esq. Glen Rose, Texas 76043 Worsham, Forsythe, Sampels &

Wooldridge Regional Administrator _

2001 Bryan Tower, Suite 2500 U. S. NRC, Region IV Dallas, Texas 75201 611 Ryan Plaza Drive Suite 1000 - '

Mr. Homer C. Schmidt Arlington, Texas 76011 Manager - Nuclear Services Texas Utilities Generating Company Lanny A. Sinkin, Executive Director Skyway Tower Nuclear Information and 400 North Olive Street Resource Service L. B. 81 1346 Connecticut Ave., N.W. 4th Floor Dallas, Texas 75201 Washington, D. C. 20036 Mr. Robert E. Ballard, Jr. B. R. Clements Director of Projects Vice President Nuclear l Gibbs and Hill, Inc. Texas Utilities Generating Company L 11 Penn Plaza Skyway Tower New York, New York 10001 400 North Olive Street, LB#81

! Dallas, Texas 75201 Mr. A. T. Parker l Westinghouse Electric Corporation Ms. Billie Pirner Garde

! P. O. Box 355 Citizens Clinic Director Pittsburgh, Pennsylvania 15230 Government Accountability Project 1901 Que Street, N. W.

Renea Hicks, Esq. Washington, D. C. 20009 Assistant Attorney General Environmental Protection Division David R. Pigott, Esq.

P. O. Box 12548, Capitol Station Orrick, Herrington & Sutcliffe Austin, Texas 78711 600 Montgomery Street San Francisco, California 94111 l Mrs. Juanita Ellis, President Citizens Association for Sound Anthony Z. Roisman, Esq.

Energy Trial Lawyers for Public Justice

1426 South Polk 2000 P. Street, N. W.

l Dallas, Texas 75224 Suite 611 Washington, D. C. 20036 Ms. Nancy H. Williams CYGNA 101 California Street San Francisco, California 94111

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COMANCHE PEAK cc: Mr. Dennis Kelley Resident Inspector - Comanche Peak c/o U. S. NRC P. O. Box 1029 Granbury, Texas 76048 Mr. John W. Beck Manager - Licensing Texas Utilities Electric Company Skyway Tower 400 N. Olive Street L. B. 81 Dallas, Texas 75201 Mr. Jack Redding .

Licensing Texas Utilities Generating Company 4901 Fairmont Avenue Bethesda, Maryland 20814 William A. Burchette, Esq.

Heron, Burchette, Ruckert & Rothwell Suite 700 1025 Thomas Jefferson St., N. W.

Washington, D. C. 20007 Mr. James McGauhy Southern Engineering Company of Georgia 1800 Peachtree Street, N. W.

Atlanta, Georgia 30367-8301 L

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,=. e Mr. M. D. Spence With respect to your request, the NRC staff finds the use of these Code Cases acceptable provided the following items are implemented:

(a) Piping systems to which the two Code Cases are to be applied are identified in the FSAR; (b) For each of the systems identified in (a), describe whether the Code Cases are to be used for new analyses, for reconcilation work, or support optimization; (c) The Code Cases should be used only for piping systems analyzed by response spectrum methods and not those using time-history analysis methods; (d) Due to an increase in system flexibility, when the Code Cases are used, all predicted maximum displacements shall be checked for adequate clearance with adjacent structures, components, and equipment, and all mounted equipment shall be checked to assure that the increased motion is within the acceptance envelope; and that should the usage of these Code Cases result in removal of supports and restraints, the remaining supported piping system shall be evaluated to assure that piping system stability is guaranteed for all operating modes.

(e) Piping system design specifications and required design documents shall be revised.

(f) The requirement in Welding Research Council Bulletin 300 in section entitled " Technical Position on Industry Practice" should be complied with.

Further, we request that you consider whether a Construction Permit amend-ment is necessary. If not, please provide your rationale.

l Should there be further questions concerning this subject, please contact l the Project Manager.

l Sincerely, 4 Vincent S. Noonan, Director for Comanche Peak Project Division of Licensing cc: See next page DISTRIBUTION:

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