ML20151L667
| ML20151L667 | |
| Person / Time | |
|---|---|
| Site: | Hatch  |
| Issue date: | 07/28/1988 |
| From: | Crocker L Office of Nuclear Reactor Regulation |
| To: | Hairston W GEORGIA POWER CO. |
| Shared Package | |
| ML20151L669 | List: |
| References | |
| REF-GTECI-A-46, REF-GTECI-SC, TASK-A-46, TASK-OR TAC-56227, TAC-56228, NUDOCS 8808040105 | |
| Download: ML20151L667 (3) | |
Text
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W RIO
'o UNITED STATES
~g NUCLEAR REGULATORY COMMISSION o
WASHINGTON, D. C. 20555 July 28,1988 Docket Nos.: 50-321 50-366 Mr. W. G. Hairston, III Senior Vice President - Nuclear Operations Georgia Power Company P. O. Box 4545 Atlanta, Georgia 30302
Dear Mr. Hairston:
SUBJECT:
SEISMIC DESIGN ISSUES OF HATCH UNITS 1 AND 2 (TAC Nos.
56227 and 56228)
REFERENCES:
(1) Letter to J. P. O'Reilly from L. T. Gucwa of Georgia Power Company (GPC) dated January 6, 1984 (2) Letter to Region II from L. T. Gucwa, dated September 12, 1984 (3) Letters to John F. Stolz from L. T. Gucwa of GPC dated Decenber 14, 1984; December 21, 1984; January 1, 1985; May 13, 1985 (4) Letters to NRC from L. T. Gucwa of GPC dated November 13, 1986; March 4, 1987 (5) UCRL - 21015, "Review of Seismic Analysis of Hatch Units 1 and 2 In-Structure Response Spectra," dated November 1987 An error in peak broadening of the floor response spectra was discovered by the licensee, and the NRC was notified of this error by Reference 1.
During the ensuing review process, seismic design of cable trays and pipe supports Was identified to have the same errors.
Since the plant is located in a soil site and the design response spectra for Units 1 and 2 at the same site are different (Unit I was licensed much earlier than Unit 2), the staff decided to perform an independent evaluation of the soil-structure-interaction effect through the Lawrence Livermore Laboratory (LLNL) by E0E Inc., a subcon-tractor to LLNL. Reference 5 documents the results of this effort and is enclosed with this letter.
The results reported in Reference 5 show that the Unit 2 floor response spectra (frs) envelope the Lt.NL spectra, but there are some instances at lower frequencies where the Unit 1 frs are exceeded by the LLNL spectra.
The LLNL study is based on the use of the CLASSI computer code which incorporates daniping due to radiation of seismic waves into the foun-dation media.
The assessment of radiation domping in the CLASSI code may be somewhat excessive based on recent seismic experiments in LOTUNG, Taiwan.
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However, financial constraints precluded performing additional sensitivity studies.
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O Mr. W. G. Hairston, III In spite of our reservation indicated obove, the LLill report serves a useful purpose - it shows that there is no intnediate safety concern regarding seismic Capability of the plant in general.
The llRR Geosciences Section performed a review of the LLNL report and that assessment is also attached.
The purpose of this letter is to make the LLNL report available end to provide you with our assessment that while Georgia Power Company is proceeding with its comprehensive program of seismic margins study and the implen:entation of the unresolveo sofety issue A-46 on seismic qualification of equipment, the NRR stoff does not have any ii:.Tediate concerns a. bout the seismic capability of Hatch Units 1 and 2.
Please call me if ycu have any questions.
Sincerely, Original Signed by:
Lawrence P. Crocker, Project Manager Project Directorote 11-3 i
Division of Redctor Projects - I/11
Enclosures:
- 1. UCRL-21015
- 2. Staff Evalu6 tion Report I
cc: See next page DISTIBUTION DBcliH TTTii.
NRC PDR Local PDR PDil-3 Reading S. Varga 14-E-4 G. Loinos 14-H-3 D. Matthews 14-H-25 H. Rood 14-H-25 L. Crocker 14-H-25 G. Bagchi 8-0-22 C. Tan 8-D-22 D. Guzy NLS302 OGC 15-B-18 E. Jordan MNBB-3302 B. Grimes 9-A-2 ACRS (10)
H-1016 HATCH PLANT FILE
/
PDi{l,-p PD l-3 PDil-3 MR6 h3 LCrocker:sw DHat+5ews 1/ff/88 7/A/88
}/g88 i
s Mr. W. G. Hairston, III Edwin I. Hatch Nuclear Plant, Georgia Power Company Units Nos. I and 2 cc:
G. F. Trowbridge, Esq.
Mr. R. P. Mcdonald l
Shaw, Pittman, Potts and Trowbriage Executive Vice President -
l 2300 N Street, N. W.
Nuclear Operations Washington, D.C.
20037 Georgia Power Company P.O. Box 4545 Mr. L. T. Gucwa Atlanta, Georgia 30302 Engineering Department Georgia Power Company P. O. Box 4545 l
Atlante, Georgic 30302 Nuclear Safety and Compliance Manager Edwin I. Hatch Nuclear Plant Georgia Power Company P. O. Box 442 Baxley, Georgia 31513 Mr. Louis B. Long Southern Company Services, Inc.
l P. O. Box 2625 i
Birmingham, Alabama 35202 j
Resident Inspector U.S. Nuclear Regulatory Commission i
Route 1, Box 725 Bexley, Georgia 31513 Regional Administrator, Region II U.S. Nuclear Regulatory Commission 101 Marietto Street, Suite 2900 Atlanta, Georiga 30323 Mr. Charles H. Badger Office of Planning and Budget Room 610 270 Washington Street, S.W.
Atlanta, Georgia 30334 Mr. J. Leonard Ledbetter, Commissioner Departnent of Natural Resources 270 Washington Street, N.W.
Atlanta, Georgia 30334 Chairman Appling County Commissioners County Courthouse Bexley, Georgia 31513 l
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