ML20031G786
| ML20031G786 | |
| Person / Time | |
|---|---|
| Site: | Haddam Neck File:Connecticut Yankee Atomic Power Co icon.png |
| Issue date: | 10/14/1981 |
| From: | Crutchfield D Office of Nuclear Reactor Regulation |
| To: | Council W, Counsil W CONNECTICUT YANKEE ATOMIC POWER CO. |
| References | |
| TASK-02-04, TASK-02-04.B, TASK-2-4, TASK-2-4.B, TASK-RR LS5-81-10-21, LSO5-81-10-021, LSO5-81-10-21, NUDOCS 8110260006 | |
| Download: ML20031G786 (4) | |
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DISTRIBUTION October 14, 1981 Docket NRC PDR Local PDR Docket No. 50-213 ORB Reading LS05-81-10-021 NSIC
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'C Connecticut Yankee Atomic Power Company 0 ELD Post Office Box 270 OI&E (3) d C./
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Dear Mr. Counsil:
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SUBJECT:
HADDAM NECK PLANT SEP TOPICS II-4, GEOLOGY AND SEISMCLOGY AND II-4.B. PROXIMITY OF TECTONIC STRUCTURES Based on new information regarding recent selsmic activity near the Haddam Neck site, we have found that additional information described in the enclosure to this letter is needed.
We request your response within 45 days of your receipt of this letter.
Sincerely, Original signed by Dennis H. Crutchfield, Chief Operating Reactors Branch #5 Division of 1.icensing
Enclosure:
l Request for Additional Information i
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See next page 8110260006 811014 i
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Mr. W. G. Counsil October 14, 1981 cc
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Day, Berry & Howard Counselors at Law One Constitution Plaza Hartford, Connecticut 06103 Superintendent Haddam Neck Plant RFD #1 Post Office Box 127E East Hampton, Connecticut 06424 Mr. Richard R. Laudenat Manager, Generation Facilities Licensing
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Northeast Utilities Service Company P. O. Box 270 Hartford, Connecticut 06101 Russell Library 119 Broad Street Middletown, Connecticut 06457 Board of Selectmen Town Hall Haddam, Connecticut 06103 Connecticut Energy Agency ATTN:
Assistant Director Research and Policy Development Department of Planning and Energy Policy 20 Grand Street Hartford, Connecticut 06106 U. 5. Environmental Protection Agency Region I Office ATTN: Regional Radiation Representative JFK Federal Building Boston, Massachusetts 02203 Resident Inspector Haddam Neck Nuclear Power Station i
c/o U. S. NRC East Haddam Post Office East Haddam, Connecticut 06423 h
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I SEP Topic II-4 and II-4.B Request for Additional. Information Haddas Neck Pl.an_t 2
Connecticut Yankee Atomic Power Company Docket No. 50-213 After several years of no discerni'ble seismic activity in the historically active Moodus area, numerous micro earthquakes have been recently, detected.
During the period Aug. 3-19, 1981 approximately 350 shallow events were recorded. The closest mic,roearthquake was located 4 km northeast of the pl ant. Some of these events were felt locally.
The NRC is closely following these activities, however, because of the proximity of the earthquake activity to the Connecticut Yankee Plant, we request the following information with respect to our Systematic Evaluation Program (SEP).
1.
A listing and an epicentral map showing the location of all detectable events superimposed on a structural geology' map of the area. Examine if these earthquakes are located in the vicinity of a topographic lineament which follows the Salmon River.
The presence of the Higganum dike System 4 km northwest of, and parallel to the lineament, and the Triassic Jurassic border fault further to the northwest suggests the lineament may be structurally controlled.
Is the Salmon River structurally controlled?
If so, define the structure (i.e., if a fault, give strike, dip, magnitude of offset and probable age of last movement).
Is there evidence in the river terraces of deformation, or is there evidence that demonstrates a lack of deformation ~l Are there other structures in the vicinity of the ethquakes with which there could be a relationship? If so, define those structures.
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2.
What is the relationship of the structure (if there is a structure) to the structural geology in the vicinity of the sitei 3.
A hypocentral map showing the depth of the different events and any conclusion which can be drawn from this figure.
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Correlation between the recent seismic activity and the historical activity.
- 5. ' Determine the focal mechanism solution of as many of the micro earthquakes as possible and discuss the relationship of the result to the orientation of stress in the region as evi'denced in the geology.
6.
What is the significance of the earthquake activity to the ear thquake design bases (r?sponse spectra) of the Connecticut Yariee site. Discuss the potential of near field motion in terms of the design bases.
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