ML20212H682
| ML20212H682 | |
| Person / Time | |
|---|---|
| Site: | South Texas  |
| Issue date: | 02/27/1987 |
| From: | Kadambi N Office of Nuclear Reactor Regulation |
| To: | Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 8703060192 | |
| Download: ML20212H682 (37) | |
Text
1 ,) -
Distribution
' Docket Nos. 50-498 BGrimes e and 50-499 271987EIERH7ffe
'#RC/ local PDR 2M'ACRS(10 PAD 5 Reading JDPage PKadambi DGuzy Applicant: Houston lighting and Power Company OGC-Beth RI.aGrange EJordan GBacchi Facility: South Texas Pro.iect, Units 1 and 2 PlBrammer MHartzman File 3 lc PYChen RBallard
SUBJECT:
SUMMARY
OF MEETING ON USE OF ASME CODE CASE N-411 WITH MUI.TIPl.E RESPONSE SPECTRA. - JANUARY 22, 1987 The meeting was held to discuss the methodology used by the applicant regarding the above sub. ject, and to develop agreement between the applicant and the NRC staff on corrective measures to be applied to parts of the methodology which the staff has found unacceptable. The attendees at the meeting are shown in Enclosure 1. The viewgraphs presented by the applicant are provided in Enclosure 2.
Discussion:
The staff had indicated to the applicant by letter dated January 16,1987, and previously by telephone contact, that the applicants use of Code Case N-411 in con.iunction with the multiple support input response spectra method (MRS) of analysis was unacceptable. During the meeting, the applicant presented results from 8. study calculations which had been performed using the methods indicated by the staff to be acceptable. These results demonstrated that the average ratio of total calculated stress to allowable stress for these systems did not significantly change (less than 10% increase) when the acceptable methods were used. In addition, the average margins (allowable stress divided by calculated stress minus 1.0) on these calculations were large, in the range
- of 1.5 to 9. The applicant proposed performing 15 sets of such study calculations for the 12 applicable piping systems. To provide reasonable assurance that these 15 study calculations represent a sample size large enough to demonstrate that they are typical of the 58 analyses of record, the l' staff requested that the applicant include the following piping system variables in these study calculations
- 1. All applicable piping diameters.
l 2. All applicable elevations.
- 3. Response spectra at all applicable locations.
- 4. All support design types.
In a letter dated January 30, 1987, the applicant submitted a detailed description of the pronosed program. The letter commits to include all of t
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the above variables as part of the study. The staff has concluded that the applicant's program is acceptable pending documentation of final results, and pending a response to the followino comments:
- 1. It is the staff's understanding that for the remaining 43 analyses of record for which no study calculation was performed, the average margins are in the same range as those in the 15 study calculations. If this not the case, additional study calculations should be performed for those systems which currently have significantly lower average margins.
- 2. The applicant should provide a commitment trat all future pipina seismic analyses will be performed using the a ceptable methods outlined in the staff's letter of January 16, 1987.
/s/
N. P. Kadabmi, Pro. ject Manager PWR Pro. ject Directorate #5 Division of PWR I.icensing-A
Enclosures:
As stated cc: See next page j .
PAD #5: DP 78 PKadambi:.jch RBallard 2 /p787 2-/A7 /87
-s- e Mr. J. H. Goldbero Houston I.ighting and Power Company South Texas Project CC:
Brian Berwick, Eso. Resident Irspector/ South Texas Assistant Attorney General Proiect
. Environmental protection Division c/o U.S. Nuclear Reaulatory Commission P. O. Box 12548 P. O. Box 910 Capitol Station Pay City, Texas 77414 Austin, Texas 78711 Pr. Jonathan Davis Mr. J. T. Westermeir Assistant City Attorney Manager, South Texas Project City of Austin Houston I.ichting and Power Company P. O. Box 1088 P. O. Box 1700 Austin, Texas 78767 Housten, Texas 77001 Ms. Pat Cov Mr. H. L. Peterson Citizens Cencerned About Muclear-Mr. G. Pokornv Power City of Austin 5106 Casa Oro P. O. Box 1088 San. Antonio, Texas 78233 Austin, Texas 7P767 Mr. Mark R. Wisenbero Mr. J. B. Poston Manager, Nuclear I.icensing Mr. A. Von Rosenbero Houston lightiro and Power Company City Public Service Boad P. O. Box 1700 P. O. Box 1771 Houston, Texas 77001 San Antonio, Texas 7P296 Mr. Charles Halligan Jack R. Newman, Eso. Mr. Burton L. I.ex Newman & Holtzinger, P.C. Bechtel Corporation 1615 1. Street, NW P. O. Box 2166 Washington, D.C. 20036 Houston, Texas 77001 Melhert Schwartz , Jr. , Esq. Mr. E. R. Brooks Baker & Botts Mr. R. l.. Range One Shell Pla7a Central Power and I.icht Company Houston, Texas 77002 P. O. Box 2122 Corpus Christi, Texas 7P403 Mrs. Peggy Buchorn Executive Director Citizens for Ecuitable Utilities, Inc.
Route 1, Box 1684 Brazoria, Texas 77429
D '.
Houston.1.ichtino # Power Company South Texas Project cc:
Recional Administrator, Recion IV U.S. Nuclear Reculatory Commission Office of Executive Director for Operations 611 Ryar Plaza Drive, Suite 1000 Arlington, Texas 76011 Mr. I.anny Sinkin, Counsel for intervenor-Citizens Concerned about Nuclear Power, Inc.
Christic institute 1324 North Capitol Street Washington, D.C. P0002 f.icensino ReDresentative Houston I.ichtino and Power Company Suite 1309 7910.Weedmont Avenue Bethesda, Marylard 70814
o e ENCI.05URE 1 ATTENDEES OF SOUTH TEXAS PROJECT PEETING
- polication of Code Case N-411 in Conjunctior, With Apprerriate Response Spectra.
Januarv 22, 1987 N. P. Kadambi J. D. Pace
'D. Guzy i R. G. l.aGrance G. Bapchi H l. . R rammer M. Hartzman P Y. Chen 4
1icensee J. T. Westermeier Pl.AP/ Pro.iect Manaaer A. ?becaria BEC/Profect Manager G. C. Crim BEPC/Strest S. A. Bernsen BEPC/0A R. l.. Reth Bechtel STP/Prc.iect Engineer Mark Wisenburg Pl.8P/ Deputy Proiect Manager j A. B. Poole Pl.4P/ Engineering i
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IBtclosura 3 AGENDA FOR MEETING ON USAGE OF CODE CASE N-411 JANUARY 22, 1987 ITEM -
PERSON
- 1. INTRODUCTION M. R. WISENBURG
- 2. BACKGROUND AND CALCULATION STATUS A. B. POOLE
- 3. REVIEW OF STUDY CALCULATION DATA R. BECK
- 4. RECOMMENDATION FOR STP PROGRAM A. B. POOLE
- 5. NRC CAUCUS
- 6.
SUMMARY
M..R. WISENBERG
- o. >
RtVIEW 0F STP STUDY CALCULATION DATA
3- .
TOTAL'STP SCOPE USE OF MRS + N411 TOTAL MRS + N411 SCOPE STRESS PROBLEMS - 58 N0. OF SUPPORTS - 1867 CLASS 1 CLASS 2-3 STRESS PROBLEMS-11 STRESS PROBLEMS-47 NO. OF SPPTS.- 530 NO. OF SPPTS-1337 WITH 50 UITHOUT SG WITH SG WITHOUT 50 STRESS PROBLEMS-11 STRESS PROBLEMS-23 STRESS PROBLEMS-24 NO. OF SPPTS.- 530 H3NE "C. CF SPPTS.- 762 N0. OF SPPTS.- 575
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' .; 7 STUDY CALCULATLON PROCESS
- V RUN STRESS ANALYSIS PROBLEM .
CHECK 1/0 1
CHECK PIPE STRESS .
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I CHECK VALVE ACCELERATIONS RESOLVE OVERSTRESS ('IF ANY)
PREPARE PIPE SUPPORT LOAD SHEETS c IP s REVIEW PIPE SUPPORT DESIGNS ,
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STP RECOMMENDED STUDY. CALCULATION SCOPE TOTAL CMPLT AECOMMENDED SYSTEM CLASS PROBLEMS 1/21/87 SAMPLE RC- 1/2-3 3 1 CV 1/2-3 5- 1 1 RH 1/2-3 4 2 2 SI 1/2-3 4 1 1 AF 2-3 8 1 SL 2-3 2 1 SB- 2-3 8 1 FC 2-3 5 2 2 CC 2-3 9 2 2 FW 2-3 4 1 CS 2-3 2 1 MS' 2-3 4 1 58 8* 15*
- ENV + N411
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i STP' , s PROPOSED PROGRAM FOR MRS + N4.12' STUDY CALCULATIONS 0 COMPLETE ONE STUDY CALCULATION FOR EACH SYSTEM'- 12 .
O EVALUATE ALL PIPE STRESS, SUPPORT LOADS, VALVE ACCELERATIONS, N0ZZLE LOADS FOR EACH STUDY CALCULATION.
O IDENTIFY'ANY CASE WHERE HARDWARE MODIFICATIONS ARE REQUIRED.
O PROVIDE SCHEDULE FOR COMPLETION OF M0'DIFICATIONS.
0 REVISE TOTAL CALCULATIONS INVOLVED WITH HARDWARE MODIFICATION.
O COMPLETE STUDY CALCULATIONS FOR ADDITIONAL PIPING AND SUPPORTS IN THE AFFECTED SYSTEM. ,
~
4 O FOR AS-BUILT RECONCILIATION ANALYSIS USE ENVELOP + N411 WHEN REANALYSIS REQUIRED.
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