ML19242A207
| ML19242A207 | |
| Person / Time | |
|---|---|
| Site: | South Texas  |
| Issue date: | 05/24/1979 |
| From: | Eric Turner HOUSTON LIGHTING & POWER CO. |
| To: | NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV) |
| References | |
| NUDOCS 7907310607 | |
| Download: ML19242A207 (2) | |
Text
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b Q.
Houston j-Lighting y%j h
& Power f
ij Company b
Electric Tower s
I Houston. Texas 77001 l
l I-k PO Box 1700 t
May 24, 1979 SFN: V-0540 ST-HL-AE-344 Director, Region IV Office of Inspection ant e forcemr.nt n
611 Ryan Plaza Drive, Su 'tc 1000 Arlington, Texas 76102
Dear Sir:
South Texas Project Units 1 & 2 Docket Nos. STN 50-498, STN 50-499 IE Bulletin No. 79-07 Bulletin Number 79-07 has been reviewed by Houston Lighting and Power Company.
Invegtigation indicates that none of the methods listed under Item (1) of the bulletin were used in the seismic piping analyses for the South Texas Project. SUPERPIPE, the computer code used by EDS in the design of the South Texas Project, combines both the modal and directional responses by either the SRSS or absolute sumation techniques.
In the review of Westinghouse operating plant analyses, it was determined that WESTDYN utilized the algebraic combination for a number of analyses performed prior to 1972.
Subsequent to 1972, WESTDYN was updated to reflect the more appropriate absolute sum combination.
In respense to Item (3), SUPERPIPE has already been bench-marked against the ASME Eenchmark Problem 1, "A Problem cn Dynamic Analysis of a Three-Dimensional Structure".
In addition, SUPERPIPE has been ccapared in a series of benchmark tests against the piping analysis programs PISOL, NUPIPE, PIPESD, ME-lCl (Bechtel Power Cor-poration), and ADLPIPE.
Benchmark testing of WESTDYN is docu: rented in WCAP 8252, Revisicn 1.
If you have any questions, please contact us.
Very truly yours, MdM E. A. Turner Vice PN-ident Power Pla,.
Construction 590051
& Techn. a1 Services PLW:bf 70073106,0 7
Ib;sNLT)bng & Poe Company Director, Region IV Office of Inspection and Enforcement ST-HL-AE-344 Page 2 cc: Director, NRC Office of Inspection and Enforcement C. Thrash (Bak?r & Botts)
R. Gordon Gooch (Baker & Botts)
J. R. Newman (Lowenstein, Newman, Reis, Axelrad & Toll)
D. G. Barker A. J. Granger R. A. Frazar 590052