ML17037B829
| ML17037B829 | |
| Person / Time | |
|---|---|
| Site: | Nine Mile Point  |
| Issue date: | 04/27/1977 |
| From: | Mcmullen R, O'Donnell E Office of Nuclear Reactor Regulation |
| To: | Stepp J Office of Nuclear Reactor Regulation |
| References | |
| Download: ML17037B829 (10) | |
Text
APR 3'7 1977 hfEHORANDM FOR>
J.
C. Stepp, Chief, Geosciences
- Branch, DSE FROM:
R. McMullen, Geologist, Geoeciences,Branch, DSE E. O'Donaell, Geologist, Geosciences
- Branch, DSE THRU:
R. Hofmann, Leader, Geology and Seismology Section Geosciences
- Branch, DSE
SUBJECT:
EKA1GNATXON OP HER TRENCHES EXPOSING 'THE FAULT AT NXNE MXLE POINT AND RECENTLY DISCOVERED FAULTS XH THE XNTAKE TUNNEL SHAFT 5"p P/5 A meeting was held on 14 April, 1977 at the Nine Mile Point Unit 2 site
,among representatives of Niagara Mohawk Power Company, its geotechnical consultaat Dames and Moore, the New York Geological Suxvey and the Nuclear Regulatory Commission.
A list of attendees is enclosed.
The purpose>of the meeting was to examine new trenches, review the results so far of the investigatioa program and to examine several recently discovered minor, low angle thrust faults in the shaft to the cooling water"iatake tunnel.
The Applicant hM completed one aew trench (trench 5) since our last visit in December, 1976 (see fig. 1 for locations of features meat'ioned).
Also completed were, geomorphic studies, initial borings along two north-south lines across the fault and a series of in situ stress measurements in one borehole.
She features in trenches 3 and 4 were described in an earlier trip report (18 December, 1977).
An approximately 4 feet high bedrock scarp along the fault plane ie present in both trenches.
The deformation continues up thxough the glacial and post glacial deposits as monoclinal folding diminishing from~up to 2 1/2 feet of offset ia tillto about 2 inchee at the top of overlying lakebed deposits.
An apparently undeformed layer of organic soil overlies the fault.
Carbon 14.dating indicates an age of 9,800, to 11,200 years for this layer.
The width of the fault zone varie's, but averages about 30".
Detailed mapping of trenches 3 and 4, and examination of trench 5
by Dames and Moore revealed:
(1) sub-horizontal slickensides.indicating left lateral strikemlip faulting; OPPICd~
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7 ~ f I'I2 g 2/P ~ Sp S 2 v I ll ,/4' '>>I g g,, "g 2 7 ."-.f.">>E P,r>>," E J. C. Stepp b ~l T) ~PR 2y $77 DISTRIBUTION: CENTRAL FILE NRR RDG GB RDG DSE RDG The Applicant informed us that he would like to begin filling trenches 1, 2 and 3 in seven to ten days. The bedrock slot in trench 3 would be left open as well as trenches 4 and 5. Pa stated that we had no ob)ection to filling trenches 1, 2 and 3 as long as they were mapped and photographed in detail, and that aU, the features observed in l., 2 and 3 were preserved in the othex'renches, They do not plan to determine the so1Ltheastern extent of the fault because the apparent supex'ficiil nature of che latest movement on the fault rules out the possibility of a large earthcjuake occurring on it,. The NRC willnot make a decisi.on on this matter until additional data is available. Future submittals planned by Niagax'a Mohawk include: a letter briefly describing the thrust faults in.the intake.-.tunnel shaft and updating the investigations of the vertical fault throujh'he cooling tower area, and x'evi.sing the lettex of 24 Pebruary, 1977 to reflect any new information that would change interpretations made at that time. A final report of all geologic features on the site and the results of all investigations willbo available in 4 or 5 months. R. B. McMullen, Geologist. Geosciences Branch Division of Site Safety and Environmental Analysis Enclosure! As stated E. O'Donnell, Geologist Gcosciences Branch Division of Site Safety and Environmental Analysis cc: w/enclosure W, Gammill Q. Kana R. Jackson J, Kelleher Z. O'Donnell R. McMullen-D. Bunch A. Toth, Region I ACRS (17) X'DR Local PDR R. Morris, USGS J. Davis, New York State GS R. Pakundiny, NYSGS R. Dineen, HYSGS T. Deboor - State of Ncw York Energy Office DPPICEW DSE:ST GB
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~ E E-I I 'I e I Er \\'.EI QN I I v 'E EEI ~ I e e ~ hr I E I' e e Efl I ,efh . /r'Ee ~ ~ Ilv,"IT e E. ,ere If,fr+ e II, I I E I ",N ~ LIST OP ATTENDEES Nia ara-Mohawk Power Com an R. Belter T. Haybrook N. Rademacher C. Terry Dames 6 Moore J. Markham M. McWhorter D. Stephenson J. Szymanski New York Geolo ical Surve R. Dineen Nuclear Re ulator Commission R. McMullen E. O'Donnell A. Toth l&E, Region l h ' 't r ~ J ' ",q ~.s ~ I ~ ~ ~ ~. S / ~ I UNiT. i UfllT ? ~ ~ J ~ ~ ~ Fig. 1 Location of faults, trencBes; test borings and site off overcore stress measurements NINE MILE POINT CLEAR POWER PLANT SITE OF OV ORE STRESS 5KASUR]9KNTS 7-Z~uci~ p ~ PIT ) 1 SIH~STRAL FAuLy-.~ 20o TRENCH 3 I l l~ l~~ 1 TEST BORINGS T-36 ~ 'W
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