ML19310A251
| ML19310A251 | |
| Person / Time | |
|---|---|
| Site: | Vallecitos File:GEH Hitachi icon.png |
| Issue date: | 05/08/1980 |
| From: | Morris R INTERIOR, DEPT. OF, GEOLOGICAL SURVEY |
| To: | Rolonda Jackson Office of Nuclear Reactor Regulation |
| Shared Package | |
| ML19310A248 | List: |
| References | |
| NUDOCS 8006060462 | |
| Download: ML19310A251 (1) | |
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GECLOGICAL SURN EY a
22STON V.t 2:09 Mail Stop 908 May 8, 1980 Robert Jackson U.S. Nuclear Regulatory Commission Site Safety Research Branch Division of Reactor Safety Research Washington, D.C.
20555
Dear Bob:
The USGS has reexamined its position as stated in our Review dated September 5,1979 regarding potential net slip along the Verona Fault in the vicinity of the General Electric Test Reactor (GETR) at Vallecitos, California. The applicant has not provided an additional geologic analysis since transmittal of the reports upon which our review was based.
Some new data, however, were discussed by the applicant at the ACRS sub-committee meeting November 14, 1979. There still does not utst an adequate geologic analysis by the applicant of fault movement at the GETH site upon which the potential for fault movement or an estimate of the expected net slip can be made.
The USGS Administrative Report transmitted to you April 22, 1980 contains an analysis by the USGS of the applicant's information presented at the November ACRS sub-committee meeting. The summary, page 1, of our report states "During the last faulting episode there was 2-5 feet of movement on the B-1/B-3 f ault, 3 feet of displacement on the B-2 fault, and 1.5 feet (?) of slip on the H fault" and on page 11,
"...f aulting is presumed to have occurred in the zone simultaneously.
Accordingly, there was at least 8 feet (9.5 f t?) cf cumulative dip-slip movement in the thrust fault zone during the last episode of faulting, sometime after 2,000-4,000 B. P."
This USGS analysis of the applicant's data does not provide any basis for changing our position, as stated in our Review of September 5,1979, regarding the amount of slip that might occur on the Verona Fault. The 1 meter of displacement proposed by the applicant does not appear to be co.servative in light of the 5 feet of movement recognized along the B-1/3-3 f ault. Furthermore, there is no compeling evidence that eliminates the possibility of new strands of faulting in the immediate area of the reactor vessel.
Sincer ely,
Robert H. Morris Deputy Chief Reactor Hazards Research Program 8006060 M g
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