ML20149J250
| ML20149J250 | |
| Person / Time | |
|---|---|
| Site: | Comanche Peak  |
| Issue date: | 02/10/1988 |
| From: | Terao D NRC OFFICE OF SPECIAL PROJECTS |
| To: | NRC OFFICE OF SPECIAL PROJECTS |
| Shared Package | |
| ML20149J254 | List: |
| References | |
| NUDOCS 8802220328 | |
| Download: ML20149J250 (6) | |
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UNITED STATES NUCLEAR REGULATORY COMMISSION j
WASHINGTON, O. C. 20666 e
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February 10, 1988 Docket Nos. 50-445 and 50-446 APPLICANT:
Texas Utilities Electric Company (TV Electric)
FACILITY :
Comanche Peak Steam Electric Station (CPSES), Units 1 and 2
SUBJECT:
SUMMARY
OF AUDIT ON JANUARY 21-22, 1988 - IMPLEMENTATION OF PIPING DESIGN CRITERIA On January 21-22, 1988, the NRC staff and its consultants conducted a followup audit of the TV Electric Corrective Action Program design validation for piping at the offices of Stone and Webster Engineering Corporation (SWEC) in Cherry Hill, New Jersey.
The purpose of the audit was to continue staff review of the adequacy of the implementation of design criteria developed by SWEC for the resolution of generic technical issues associated with large bore piping and pipe supports at CPSES.
The followup audit was a continuation of audits previously held on September 2-4, 1987, September 22-24, 1987, and October 28-30, 1987.
(See NRC staff audit summaries dated September 28, 1987, October 16, 1987, and November 25, 1987, respectively).
In addition, the staff discussed with SWEC the responses to open items related to the SWEC NA-1140 Report from the August 25, 1987 Meeting (see Meeting Sumary dated October 2, 1987).
The following is a sumary of the issues selected during the audit, the extent l
of their implementation reviewed by the staff, and the status of the staff's l
review of issues at the conclusion of the audit. A list of persons involved l
in the audit is provided in Enclosure 1 to this sumary.
1.
NA-1140 Review - The staff discussed with SWEC its response to the open l
items remaining in the staff review of the SWEC report, "Documentation of ASME III NA-1140 Review for Piping and Supports" (NA-1140 Report).
The SWEC responses adequately resolved the staff's concerns and were documented in Revision 2 to the NA-1140 Report (Enclosure 2 to this sumary).
2.
SIF for Radial Weld Shrinkage - The staff discussed its review of the l
stress intensification factor (SIF) used to evaluate the effect of excessive girth butt weld radial shrinkage in piping.
The staff discussed the adequacy of the procedure (Attachment 3-16 of CPPP-7) and the basis for the SIF values derived by SWEC.
SWEC has issued Project Memorandum PM-229 (Enclosure 3 to this sumary) to address the staff's concerns.
Based on the methodologies and limitations provided therein, the staff finds the SIF for radial weld shrinkage to be acceptable.
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s Mr. William G. Counsil Texas Utilities Electric Company 3.
CPPP-7 Pipe Stress Design Criteria
- The staff discussed several questions resulting from its review of the CPPP-7 (Revision 3) design criteria for piping stress analysis.
The staff reviewed the differences between an October 6, 1981 letter and an October 15, 1981 letter regarding functional capability criteria and found no technical differences in the criteria therein.
Additionally, the staff reviewed the use of equivalent stttic analysis methods for small bore piping and found it uses a 1.5 multimode multiplication factor with ASME Code Case N-42 damping values.
There were no open or unresolved items identified.
4.
Pipe Sup> orts Related to Cygna Hearing - In the April 1984 hearings on the adequacy of t1e Cygna Independent Assessment Program (Phases 1 and 2), several issues were raised by the intervenor, Citizens Association for Sound Energy (CASE), in the pipe support design area.
As a part of this audit, the staff selected three pipe support calculations completed by SWEC which were related to the CASE concerns as discussed at the Cygna hearings (SI-1-325-002-S32R, RH-1-010-004-522K, and RH-1-064-011-522R).
The staff reviewed these supports to detertnine their latest status (e.g., modified, deleted, in-process).
Support SI-1-325-002-S32R, which was previously designed as a non-rigid box frame with cinched U-bolt has been revised to a stiff clamp.
Support RH-1-010-004-522K, which was previously designed as an axial / rotational restrair.t with dual snubbers, has been deleted.
Support RH-1-064-011-S22R, which was previously designed using a cinched U-bolt, has been redesigned using a stiff pipe clamp.
The modifications to the three supports are in accordance with CPPP-7 design criteria and are thus acceptable.
5.
Axial / Rotational Restraints - The staff selected four pipe support calcu-lations to verify the lug / clamp orientation.
The four pipe support calcula-tiens showed a lug / clamp orientation with 4 lugs at 90' to each other and the clamp ears at 45* to the lugs.
The staff reviewed Project Memorandum 154, "Axial Restraints With Lugs," and SWEC generic calculations GENX-281, "Potential Binding of Lugs in Axial Supports," and GENX-242, "Parallel Snubbers." Based on our review, the-staff finds that sufficient detail is provided in the SWEC approach for designing axial / rotational restraints to ensure proper implemen-tation of CPPP-7.
6.
Effect of Gaps in Dead Weight Supports - The staff reviewed the SWEC report, GENX-255 "Evaluation of Pipe Stress and Pipe Supports Due to As-Installed Gaps in Deadweight Supports," which addresses the effect of a 1/8-inch gap between the bottom of a pipe and a box frame support when the support is de-signed to carry the pipe dead weight.
The SWEC report evaluated the potential increase in piping stress and support loads for various enveloping cases.
For pipe stress, the potential increase due to the gap was found to be 12 percent.
For the specific case of the containment spray header supports, where several box frame supports exist adjacent to one another, SWEC has detennined that each support is capable of withstanding the additional dead weight of the piping assuming two consecutive supports are missing.
The SWEC report found that all
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Mr. William G. Counsil Texas Utilities Electric Company 1
the containment spray supports have a minimum safety factor of three to their designed dead load without exceeding A3ME Code requirements.
Thus, the safety margin ensures that the 1/8-inch gap between the bottom of the pipe and the support will not cause an overstress of the pipe and pipe supports.
The staff review of the SWEC report finds it adequately addresses the concern identified and the item is considered closed.
A total of 36 hours4.166667e-4 days <br />0.01 hours <br />5.952381e-5 weeks <br />1.3698e-5 months <br /> was involved in this audit.
David Terao, Mechanical Engineer Comanche Peak Project Division Office of Special Projects
Enclosures:
1.
List of Persons Involved 2.
NA-1140 Report (Revision 2) 3.
PM-229 cc: See next page 1
W. G. Counsil Comanche Peak Steam Electric Station Texas Utilities Electric Company Units 1 and 2
~
CC' Jack R. Newman, Esq.
Asst. Director for Inspec. Programs f
Newman a Holtzinger, P.C.
Comanche Peak Project Division Suite 1000 U.S. Nuclear Regulatory Commission 1615 L Street, N.W.
P. O. Box 1029 i
Washington, D.C. 20036 Granbury Texas 76048 Robert A. Wooldridge, Eso.
Regional Administrator, Region IV Worsham, Forsythe, Sampels &
U.S. Nuclear Regulatory Connission 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 Director of Nuclear Services 1324 North Capitol Street Texas Utilities Electric Company Washington, D.C.
20002 Skyway Tower 400 North Olive Street, L.B. 81 Ms. Billie Pirner Garde, Esq.
Dallas, Texas 75201 Government Accountaoility Project.
Midwest Office Mr. Robert E. Ballard, Jr.
104 East Wisconsin Avenue Director of Projects Appleton, Wisconsin 54911 Gibbs and Hill, Inc.
11 Penn Plaza New York, New York 10001 David R. Pigott, Esq.
Orrick, Herrington & Sutcliffe 600 Mortgomery Street Mr. R. S. Howard San Francisco, California 94111 Westinghouse Electric Corporation P. O. Box 355 Anthony Z. Roisman, Esq.
Pittsburgh, Pennsylvania 15230 Suite e00 1401 New York Avenue, NW Renea Hicks, Esq.
Washington, D.C. 20005 Assistant Attorney General Environmental Protection Division Robert Jablon P. O. Box 12548, Capitol Station Bonnie S. Blair Austin, Texas 78711 Spiegel & McDiarmid 1350 New York Avenue, NW Mrs. Juanita Ellis, President Washington, D.C. 20005-4798 Citizens Association for Sound Energy 1426 South Polk George A. Parker, Chairman Dallas, Texas 75224 Public utility Committee Senior Citizens Alliance Of Ms. Nancy H. Williams Tarrant County, Inc.
CYGNA Energy Services 6048 Wonder Drive i
2121 N. California Blvd., Suite 390 Fort Worth Texas 76133 Walnut Creek, CA 94596 l
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W. G. Counsil Comanche Peak Electric Station Texas Utilities Electric Company Units 1 and 2 cc:
Joseph F. Fulbright Fulbright & Jaworski 1301 McKinney Street Houston, Texas 77010 Roger D. Walker Manager, Nuclear Licensing Texas Utilities Electric Company Skyway Tower 400 North Olive Street, L.B. 81 Dallas, Texas 75201 Mr. Jack Redding c/o Bethesda Licensing Texas Utilities E'ectric Company 3 Metro Center, Suite 610 Bethesda, Maryland 20814 William A. Burchette, Esq.
Counsel for Tex-La Electric Cooperative of Texas Heron, Burchette, Ruckert & Rothwell Suite 700 1025 Tnomas Jefferson Street NW Washington, D.C.
20007 James P. McGaughy, Jr.
GDS Associates, Inc.
Suite 720 1850 Parkwa*/ Place Marietta, Gc3rgia 30067 Administrative Judge Peter Bloch U.S. Nuclear Regulatory Commission Washington, D.C.
20555 Elizabeth B. Johnson Administrative Judge Oak Ridge National Laboratory P. O. Box X, Building 3500 Oak Ridge, Tennessee 37830 Dr. Kenneth A. McCollom 1107 West Knapp Stillwater, Oklahoma 74075 Or. Walter H. Jordan 881 West Outer Drive Oak Ridge. TN 37830 i
List of Persons involved SWEC - Piping Design Audit (Cherry Hill, New Jersey)
January 21-22, 1988 TV Electric J. Finneran Stone & Webster Engineering Corporation E. J. Siskin R. Klause W. Wang F. Ogden S. Ali D. Vandeputte NRC/ Consultants D. Landers R. Hookway G. Moy W. P. Chen D. Terao
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