ML17053B155
| ML17053B155 | |
| Person / Time | |
|---|---|
| Site: | Nine Mile Point  |
| Issue date: | 10/25/1979 |
| From: | Mcmullen R, Thompson O Office of Nuclear Reactor Regulation |
| To: | Rolonda Jackson Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 7911050163 | |
| Download: ML17053B155 (8) | |
Text
$0- Q/O IPgc @y MEMORANDUM FOR:
THRU:
FROM:
SUBJECT:
Robert Ei Jackson, Chief
. Geosciences
- Branch, DSS Lyman l!. Heller, Leader Geotechnical Engineering Section
'eosciences
- Branch, DSS t
Leon Reiter, Leader Geology and Seismology Section Geosciences
- Branch, DSS Owen 0. Thompson,- Geotechnical Engineer Geotechnical Engineering Section Geosciences
- Branch, DSS Richard.B. McMullen, Geologist Geology and Seismology Section Geosciences
- Branch, DSS EXAMINATION OF FAULTING AT THE NINE MILE POINT 2 NUCLEAR SITE DOCKET'O.:
50-010 A meeting was held on October 10, 1979, at the Nine Mile Point site among representatives from the Niagara Mohawk Power Corporation (NMPC),
its consultants Dames and Moore and J. A. Fischer, the New York State Electric and Gas Company (NYSEG), the New York State Geological Survey (NYSGS), the Nuclear Regulatory Commission (NRC) and its consultants the Corps of Engineers (CE) and Los Alamos Science'aboratories (LASL).
A list of attendees is attached.
The main purpose of this site visit was to examine an exposure in the recent excavation for.the radwaste building of a continuation of a fault that had been previously mapped in the heater bay area excavation (see memorandums:
Stepp from Jackson, September 27, 19)6; and Stepp from McMullen, December 17, 1976).
Another reason for tl>e sste visit was to pr ovide the opportunity for geologists with the
- NYSGS, CE, and LASL who had never been there to become familiar with site faulting and rock mechanics characteristics.
The fault was encountered in the most recent -excavation at about the same level as it had been in the excavation. for the heater bay in 1976.
An attempt was
. made during the current investigation to trace it at depth toward the east where it is believed to pass into bedding planes.
However, at'the base of the trench it was still cutting across the bedding at a low angle.
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The fault is a complex zone of deformation several feet wide containing folding and s)earing with thrusting from east to west being the principal movement.
Thh zone strikes IIorth-northeast and dips toward the east at an angle of approximately 30.
Maximum displacements within the fault zone range from 4 feet horizontal and 2 1/2 feet vertical near the bottom of the trench to 7 1/2 feet horizontal and 2 1/2 feet vertical higher up in the western part of the trench.
Dialation is apparent along the fault, the bedding planes and joints.
Many of the'separations have been filled with a very plastic, laminated clay, which, based on its physical appearance and the age dating of pollen imbedded~in it,'s interpreted to have been deposited from glacial lake Iroquois.
Calcit'e mineralization is present in the fault zone,.and fluid inclusions within these crystals are being analyzed at Pennsylvania State University. "Preliminary results indicate that the crystals were formed under low temperature and low pressure groundwater conditions.
Therefore, they formed after the Cretaceous (36 million years before present) which post dates deep burial and any known hydrothermal event.
The thrusting is interpreted as being younger than the normal faulting on the Cooling Tower fault.
The Cooling Tower fault is described in NRC memorandumG;.January 4, 1977, Stepp from Jackson and McMullen; April 27, 1977 Stepp from O'Donnell and McMullen; and July 7, 1977 Stepp from McMullen)
, Deformed lake bed clays in the fault exposure in the heater bay area indicate that some movement along the fault has taken place since the end of the Pleistocene (10,000 years before present).
Mapping of the fault and analyses of materials from the fault zone are continuing.
NMPC and its consultants will decide within the next couple of weeks what course future investigations of the fault zone should take.
He had originally requested that NMPC re-open one or more of the pits across the Cooling Tower fault so that thoee geologist5'who had not seen it could do so.
NMPC was not able to accomplish this for this site visit but agreed to have one of the pits open in mid-November.
- However, an exposure of the Drainage Ditch fault, which is similar to the Cooling Tower fault was still available for observation during this site visit.
The Corps of Engineers indicated that they would not need to examine the Cooling Tower fault.
The Los Alamos consultants reserved a decision until after reviewing the NMPC's report on site faulting but indicated that it probably wouldn't beoggegyrg gg<rbe-open the pits.
- 0. 0. Thompson Owen Thompson~, Geotechnical Engineei GES, @<i'-'=--""">
- p. 5. )hcltullon Richard B; McMullen, Geologist
- GSS, GB, DSS
Attachment:
As stated
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Robert E. Jackson OcT ~s t97g cc:
w/attachment J. Knight S. Varga R. Jackson L. Rubenstein L. Reiter L. Heller D. Lynch
- 0. Thompson R. Ncf1ullen T. Wilkinson, C of E, Buffalo R. Lutton, C of E, HES J. York, LASL H. Bailey, NN6S A. Varella, Region I DISTRIBUTION:
DOCKET FILE (50-410','SB RDG OFFICE~
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List of Attendees Niagara Mohawk Power Co.
N. Rademacher P. Francisco Dames E Moore, Inc.
J.
Szymanski J.
Markham FEES Inc.
J. Fischer N.Y. State Geological Survey H. Bailey R. Fickies Corps of Engineers T. Wilkinson B. Greene R. Lutton Los Alamos F. Goff J. York NYSEG J. Bardgett NRC 0.
Thompson R. McMullen
SNt 08100