ML20074A660

Supplemental Reply Brief Re Pipe Support Design. Consideration of Thermal Expansion of Supports Not Required in Design of linear-type Pipe Supports.Certificate of Svc Encl

ML20074A660
Person / Time
Site:	Comanche Peak
Issue date:	05/11/1983
From:	Horin W, Reynolds N DEBEVOISE & LIBERMAN, TEXAS UTILITIES ELECTRIC CO. (TU ELECTRIC)
To:	Atomic Safety and Licensing Board Panel
References
NUDOCS 8305130260
Download: ML20074A660 (7)

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UNITED STATES OF AMERICA ,l 14g*fd .

NUCLEAR REGULATORY C.OSMISSION_ /g, , -

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503 1_ff BEFORE THE ATOMIC SAFETY AND LICENSING u

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In the Matter of' )

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TEXAS UTILITIES GENERATING ) Docket Nos. 50-445 and COMPANY, et al. ) 50-446

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(Comanche Peak Steam Electric ) (Application for Station, Units 1 and 2) ) Operating Licenses)

APPLICANTS' SUPPLEMENTAL REPLY BRIEF REGARDING PIPE SUPPORT DESIGN In accordance with the request of the Board, 1/ Texas Utilities Generating Co. , et al. (" Applicants") hereby supplement ,

their reply brief regarding consideration of LOCA in pipe support design. In this supplement, Applicants address the meaning of particult. ~: provisions of- the ASME Code identified by the Board. As demonstrated below, these provisioqs are consistent with Applicants' interpretation of the ASME Code presented in their April 21, 1983 Brief, and May 3, 1983 Reply Brief.

I. BACKGROUND The Board has requested that Applicants _ address the meaning l of two specific provisions of the Code and their relationship to l nr l Z$@ the other provisions already examined in Applicants' previous no b8 submittals on the question of consideration of LOCA in the o -

, o ex 1/ On May 6, 1983, Chairman Bloch telephoned Applicants to r

l gg l no request a short supplement to Applicants' reply brief E4 regarding pipe support design. Judge Bloch asked that gg Applicants submit this brief by May 11, 1983.

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i design of pipe supports. The first provision is NF-3213 (b) , which reads as follows. ,

i Terms used in the design of linear types of supports [

by stress analysis are defined in Appendix XVII.

The Board's question regarding this provision apparently is whether it is appropriate to utilize the terms in NF-3213 (which by NF-3213 (a)

I are expressly made applicable to plate and shell support analysis) in discussing linear support design, or whether terms used in Appendix XVII must be employed.

In addition, the-Board has asked for a discussion of the meaning of Appendix XVII, Section 2271.3, which provides as follows:

Provision for Expansion. Adequate provision shall be

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made _ for expansion and contraction appropriate to the function of the support structure.

As discussed below, NF-3213(b) does not limit the terminology employed in the design analysis of linear-type suppdrts only to the terms of Appendix XVII. In addition, the expansion addressed in Appendix XVII, Section 2271.3 does not include thermal expansion of the support itself, and thus is not applicable to the issue at hand.

II. DISCUSSION A. Definition of Terms Subsection NF of the ASME Code provides rules for the construction of nuclear power plant component supports. Article NF-3000 of Subsection NF establishes design requirements for those supports. Specifically, Section NF-3200 establishes design

4 requirements for all Class 1 component supports. Therein,  :

provisions applicable to the design of supports by stress analysis are established. The terms which relate to the design of plate and shell and linear-type supports by analysis are set forth in Sections NF-3213.1 through NF-3213.13 for plate and shell supports, and Appendix XVII for linear-type supports. See UF-3213 (a) and (b). However, these terms are not applicable exclusively to either plate and shell or linear-type supports where such terms are appropriate for use in connection with either type.

The general definitions of the types of stresses set forth in NF-3213 are also applicable to linear-type supports if such stresses are considered in connection with those supports.

For example, NF-3231.1, which concerns stress limits for elastic analysis of linear supports,, references NF-3213.10 for the definition of free end displacements to be considered in the design of linear supports. Fu'rther, Appendix XVII does not ' establish separate definitions for particular types of stresses which are defined elsewhere in the Code, but rather establishes allowable stress levels for different stresses and presents specific design requirements for linear supports. Thus, in designing linear-type supports, it is necessary to look to both Subsection NF and Appendix XVII, as Applicants have done in their briefs on this topic.

B. Provisions for Expansion The Board has specifically requested that Applicants address the meaning of Section 2271.3 of Appendix XVII, quoted above. In- this regard, Applicants note that this section concerns the consideration of the forces and stresses induced in supports as a result of the expansion and contraction of the supported system, as appropriate to the fun'c~ tion of the support. With respect to pipe supports, this provision applies to the expansion and contraction of the piping. system as that system is exposed to cycles of hot and cold contained fluid. Further, this provision requires that to account for the expected ~ expansion and contraction of the system, particular types of supports should be used, e. g. , sliding supports, spring hangers, etc.,

as appropriate. This provision does not, however, require that supports be designed for expansion of the support itself under LOCA conditions.

III. CONCLUSION As discussed above, the design of-linear-type pipe supports requires consideration.of both the terms and provisions of both Subsection NF and Appendix XVII of the ASME Code. With respect to Section 2271.3 of Appendix XVII, that provision does not concern the thermal expansion of supports l

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themselves. As described above, such expansion is not requi ed to be considered in the design of linear-type pipe supports.

Respect $ul submitted,-

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l Nichol; Reynolds S ./

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William A. Horin ~~

DEBEVOISE & LIBERMAN 1200 Seventeenth Street, N.W.

Washington, D.C. 20036 (202) 857-9817 Counsel for Applicants May 11, 1983 i

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UNITED STATES OF AMERICA f.- *iV;,

NUCLEAR REGULATORY COMMISSION o NN w

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BEFORE THE ATOMIC SAFETY AND LICENSING BOARD, y

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COMPANY, et _al. ) 50-446 V c) G (Comanche Peak Steam Electric ) (Application for Station, Units 1 and 2) ) Operating Licenses)

. CERTIFICATE OF SERVICE i

I hereby certify that copies of the foregoing " Applicants' Supplemental Reply Brief Regarding Pipe Support Design" in the above-captioned matter were served upon the following persons by hand delivery (*), express delivery (**) or by deposit in the United States mail, first class postage prepaid, this lith day of May 1983.

• Peter B. Bloch, Esq. Chairman, Atomic Safety and Chairman, Atomic Safety and Licensing Appeal Panel Licensing Board U.S. Nuclear Regulatory U.S. Nuclear Regulatory Commission Conmdssion Washington, D.C. 20555 Washington, D.C. 20555

• Lucinda Minton, Esq.

• • Dr. Walter H. Jordan Atomic Safety and Licensing 881 W. Outer Drive Board Oak Ridge, Tennessee 37830 U.S. Nuclear Regulatory Commission

• • Dr. Kenneth A. McCollom Washington, D.C. 20555 Dean, Division of Engineering Architecture and Technology

• Marjorie Ulman Rothschild, Esq.

l' Oklahoma State University Office of the Executive Legal l

Stillwater, Oklahoma 74074 Director l

U.S. Nuclear Regulatory Chairman, Atomic Safety and Commission Licensing Board Panel Washington, D.C. 20555 U.S. Nuclear Regulatory

! Commission ** David J. Preister, Esq.

l Washin gton, D.C. 20555 Assistant Attorney General Environmental Protection Division P.O. Box 12548 Capitol Station Austin, Texas 78711 l

a D Mr. John Collins ** Mrs. Juanita Ellis .

Regional Administrator, President, CASE Region IV 1426 South Polk Street U.S. Nuclear Regulatory Dallas, Texas 75224 Commission 611 Ryan Plaza Drive Suite 1000 Arlington, Texas 76011 Mr. Scott W. Stucky Docketing & Service Branch U.S. Nuclear Regulatory Conmission Washington, D.C. 20555 (y h William A. Horin O. Ii~

cc: Homer Schmidt Spencer C. Releyea, Esq.

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