ML20084G466
| ML20084G466 | |
| Person / Time | |
|---|---|
| Site: | Vogtle  |
| Issue date: | 04/23/1984 |
| From: | Foster D GEORGIA POWER CO. |
| To: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| References | |
| GN-346, NUDOCS 8405070234 | |
| Download: ML20084G466 (2) | |
Text
Georg.a Power Company Poute 2. Box 299A d]v l
Waynesbcro Georgra 30830 Telephone 404 554YJ61, Ext. 3360 404 724 8114. Ext 3360 n!! : 3 3 Georgia Power
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JJ cei t d Protect Vogtte Project April 23, 1984 United States Nuclear Regulatory Commission File: X78G03-M61 Office of Inspection and Enforcement Log:
GN-346 Region II - Suite 3100 101 Marietta Street Atlanta, Georgia 30303
Reference:
Vogtle Electric Generating Plant-Units 1 and 2, 50 42, 50-425; Nuclear Service Cooling Water Tower Crossover Pipin Attention: Mr. James P. O'Reilly Gentlemen:
On March 23, 1984, Mr. C. W. Hayes of Georgia Power Company reported a potential deficiency to Mr. John Rogge of the USNRC concerning the nuclear service cooling water tower basins intertie pipe. At this time, Georgia Power Company is submitting an interim report on its evaluation of this concern.
During a review of safety-related buried piping, two NSCW transfer pump discharge pipes (1202-030-6" and 1209-029-6") were found to be routed I
into an area of category 1 backfill that could potentially be affected by I
liquefaction of the upper sand stratum of in-situ soil.
l All safety-related structures must be founded on material capable of withstanding extreme loading conditions. The upper sand stratum of in-situ I
soil at the Vogtle site has a potential for liquefaction under SSE conditions.
The site has, therefore, been excavated down to a competent marl bearing l
stratum and the upper sand stratum replaced by Category 1 backfill. There is a portion of Category 1 backfill that may be affected by liquefaction of I
the adjacent in-situ soils. Safety related structures, buried piping, and l
buried conduit are placed at various depths in the backfill and are located
~
so that the distribution of their foundation stresses remain within the limits of the portion of the Category I backfill which is not dependent on the in-situ soils for support.
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8405070234 840423 PDR ADOCK 05000424 MM W
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Nuclear Service Cooling Water Tower Crossover Piping Page Two A review of all safety-related structures, buried piping, and buried conduit has been initiated. Any affected installations will be identified and evaluated. Design control procedures will be evaluated to determine the need for added controls to prevent any future mislocation. Finally, the original piping location will be evaluated for its safety impact to the plant had the situation gone uncorrected. Any other problem areas which are iden-tified during this review will also be evaluated. At this time, Georgia Power Company expects to submit a final report to the NRC on this subject by June 5, 1984.
This report contains no proprietary information and may be placed in the NRC Public Document Room upon receipt.
Yours truly, Cf D. O. Foster.
REF/D0F/tdm xc:
U. S. Nuclear Regulatory Commission Document Control Desk Washington, D. C.
20555 xc:
R. J.- Kelly R. E. Conway G. F. Head
' C. W. Hayes D. N. MacLemore D. E. Dutton W. F. Sanders-
- R. H. Pinson P. D. Rice R. A. Thomas J. A. Bailey
- 0. Batum G. Bockhold B. M. Guthrie E. D. Groover L. T. Gucwa M. Malcom H. H. Gregory, III J. T. Beckham, Jr.
J. L. Vota
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