ML20039F834
| ML20039F834 | |
| Person / Time | |
|---|---|
| Site: | Millstone  |
| Issue date: | 01/07/1982 |
| From: | Crutchfield D Office of Nuclear Reactor Regulation |
| To: | Counsil W NORTHEAST NUCLEAR ENERGY CO. |
| References | |
| TASK-02-04, TASK-02-04.B, TASK-2-4, TASK-2-4.B, TASK-RR LSO5-82-01-016, LSO5-82-1-16, NUDOCS 8201130443 | |
| Download: ML20039F834 (18) | |
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Docket No. 50-245 gl'
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G Mr. W. G. Counsil, Vice President
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Nuclear Engineering and Operations N
6 Northeast Nuclear Energy Company Post Office Box 270 Hartford, Connecticut 06101
Dear Mr. Counsil:
SUBJECT:
SEP REVIEW TOPICS II-4, GEOLOGY AND SEISMOLOGY AND II-4.B.
PROXIMITY OF CAPABLE TECTONIC STRUCTURES IN PLANT VICINITY Enclosed is a copy of our evaluation for Systematic Evaluation Program Topics II-4.
" Geology and Seismology," and II-4.B. " Proximity of Capable Tectonic Structures in Plant Vicinity." These assessments compare your site condition, as described in the docket and references with the criteria currently used by the staff for licensing new facilities. Please infonn us if your site condition differs from the licensing basis assumed in our assessments.
Our review of these topics is complete and this evaluation will be a basic input to the integrated safety assessment for your facility unless you identify changes needed to reflect the existing site condition at your facility. These topic assessments may be revised in the future if NRC criteria relating to these topics are modified before the integrated assess-ment is completed.
Sincerely, oy
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Dennis M. Crutchfield, Chief D5% d Operating Reactors Branch No. 5 poe:
Division of Licensing g,A
Enclosure:
As stated cc w/ enclosure:
See ne-*8201130443 820107
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Mr. W. G. Counsil cc William H. Cuddy, Esquire Connecticut Energy Agency Day, Berry & Howard ATTN: Assistant Director Counselors at Law Research and Policy One Constitution Plaza Development Hartford, Connecticut 06103 Department of Planning and Energy Policy Natural Resources Defense Council 20 Grand Street 91715th Street, N. W.
Hartford, Connecticut 06106 Washington, D. C.
20005 Northeast Nuclear Energy Company ATTN: Superintendent Millstone Plant P. O. Box 128 Waterford, Connecticut 06385 Mr. Richard T. Laudenat Manager, Generation Facilities Licensing Northeast Utilities Service Company P. O. Box 270 Hartford, Connecticut 06101 g
Resident Inspector c/o U. S. NRC P. O. Box Drawer KK Niantic, Connecticut 06357 Waterford Public Library Rope Ferry Road, R0ute 156 Waterford, Connecticut 06385 First Selectman of the Town of Waterford Hall of Records 200 Boston Post Road Waterford, Connecticut 06385 John F. Opeka Systems Superintendent Northeast Utilities Service Company P. O. Box 270 Hartford, Connecticut 06101 U. S. Environmental Protection Agency Region 1 Office ATTN: EIS COORDINATOR JFK Federal Building Boston, Massachusetts 02203 1
3 SEP - MILLSTONE POINT NUCLEAR POWER STATION, UNIT 1 TOPICS II 4 - GE0 LOGY AND SEISM 0 LOGY, AND II-4B - CAPABILITY OF FAULTS IN THE SITE REGION 1 INTRODUCTION 1.1 Identification of Safety Issues The SEP topics addressed in this chapter are the geology portion of Topic II-4, Geology and Seismology, and Taoic II-48, Capability of Faults in the Site Region.
The seismology section of Topic II-4, Topics II-4A, and II-4C are addressed in " Final Revi n and Recommendations for Site Specific Spectra at SEP Sites" (memorandum from R. E Jackson to W. T. Russell, 20 May, 1981).
- 1. 2 Scope of the Review The results of the Millstone, Unit 1 Construction Permit review by the Atomic Energy Commission (AEC), its advisors the U.S. Coast and Geodetic Survey (USC and GS) and the U.S. Geological Survey (USGS) are reported in the Safety Evaluation Report (SER) for the Construction Permit.
In that analysis the AEC and its advisors concluded that the geological and seismological analyses were adequate.
The USGS concluded that "there are no active faults or recent geologic structures known in the area that could be expected to localize seismicity in the immediate vicinity of the site." These conclusions were reaffirmed in 1970 in the SER following th Operating License Reveiw.
The AEC, based on advice from the USC and GS, concluded that 0.17g and 0.07g for the equivalents of Safe Shutdown Earthquake (SSE) and the Operating Basis Earthquake (OBE) were acceptable.
Since that time, two addiional units have been added to the site, Unit 2 and Unit 3.
The staff reaffirmed conclusions made during the Unit 1 review in the SERs for these additional units.
In addition to the geologic work done in regard to the three Millstone units, comparable studies were carried out in the region in connection with the 07/18/81 1-1 MILLSTONE GEOLOGY SEP SEC 1
s Pilgrim 2, Seabrook, Montague, and New England nuclear sites.
Much research has been done over the past six years under the NRC-sponsored New England.
Seismotectonic Investigations Program.
During the SEP geology review at Millstone 1, the staff relied heavily on data derived from these studies as well as other documents in the open scientific literature.
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,9 2 REVIEW CRITERIA Current licensing criteria which governed our review of the safety issues addressed in this chapter include Appendix A to 10 CFR Part 100, " Seismic and Geologic Siting Criteria for Nuclear Power Plants," and NUREG-0800, Standard Review Plan, Sections 2.5.1 and 2.5.3.
07/18/81 2-1 MILLSTONE GEOLOGY SEP SEC 2
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!-j 3 RELATED SAFETY TOPICS AND INTERFACES The geotechnical engineering aspects of the site are closely related to the topics covered in this chapter.
They are addressed under Topics II-4D, II-4E, and II-4F.
Topic II-4F is dependent on information from this chapter.
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4 REVIEW GUIDELINES Appendix A to 10 CFR Part 100, " Seismic and Geologic Siting Criteria for Nuclear Power Plants" was used in this review to provide guidance in tectonic provinces, and identifying and evaluating tectonic structures in the site region to determine whether or not any of them are capable.
1' Chapter 2.5.1 of NUREG-0800, Standard Review Plan guided the staff in its tM
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assessment of geologic features in the site area related to the potential for faulting, subsidence or collapse, landslides, weathering, or other foundation instabilities.
I Chapter 2.5.3 of the SRP was utilized for guidance in considering the I
subjects:
The structural and stratigraphic conditions of the site and vicinity (Subsection 2.5.3.1), any evidence of fault offset or evidence demonstrat the absence of faulting (Subsection 2.5.2.2), earenquakes associated with faults (Subsection 2.5.3.3), determination of age of most recent movement on faults (Subsection 2.5.3.4), determination of structural relationships of site area faults to regional faults (Subsection 2.5.3.5), identification and I
description of capable faults (Subsection 2.5.3.6), and zones requiring detailed fault investigations (Subsection 2.5.3.7).
N 07/18/81 4-1 MILLSTONE GEOLOGY SEP SEC 4
h 5 EVALUATION 5.1 Geology - Topic II-4 b.1.1 Regional Geology j
The Millstone site lies within the Seaboard Lowland section of the New England Physiographic Province (Fenneman 1938 and Thornbury 1965).
The Seaboard Lowland is a maturely ereded and glaciated peneplain with elevations ranging from sea level to less than +200 feet msl.
f The New England Physiographic Province is a northern extension of the Appalachian Mountains which has been modified by glaciation.
Bedrock is generally overlain by a few feet to a few hundred feet of glacial deposits.
Based on our review of the Pilgrim 2 and New England 1 and 2 sites, the staff concludes that the Millstone Unit 1 site is within the New England-Piedmont Tectonic Province, which is in accord with the tectonic province concept of King, Rodgers, Eardley and Hadley and Devine.
The New England-Piedmont Province is comprised of Precambrian and Paleozoic basement and sedimentary rocks that have been extensively folded, faulted, metamorphosed, and intruded by igneous rocks during successive episodes of orogenic activity.
The New England-Piedmont Province consists of major northeast southwest striking anticlinoria and synclinoria composed of metamorphic rocks and plutonic bodies.
From the west in Vermont and western Massachusetts to the Atlantic Coast these major folds are:
the Green Mountain - Sutton Mountain anti-clinorium, the Connecticut Valley - Gasps, synclinorium, the Bronson Hill -
Boundary Mountain anticlinorium, the Merrimack synclinorium, and the Coastal anticlinorium.
The site lies near the southern end of the Merrimack synclinorium.
The Merrimack Synclinorium is cut by the Honey Hill fault I
complex about 14 to 15 miles (22 to 24 kilometers) north of the site.
07/18/81 5-1 MILLSTONE GEOLOGY SEP SEC 5
f Although we accept the larger tectonic province, the New England-Piedmont Province in New England can be further subdivided based on geology into the Southeastern New England Platform and the White Mountain Plutonic Series The Southeastern New England Platform is separated from the New England-Piedm Province in the site region by the HoneyHill-Lake Char thrust fault complexe The boundary farther to the north and east is the Clinton-Newbury and B Bluff thrust fault systems.
It has been suggested (Rodgers 1972) that these generally northerly dipping thrust faults and associated rocks of high grade 6
I metamorphism represent a Paleozoic collision zone between a plate contain the Southwest New England platform and a plate containing the New England f belt.
The site lies on the southeastern New England Platform.
I The southeastern New England Platform is composed of Precambrian granitic
,1 basement rocks, Silurian and Devonian volcanic and intrusive rocks, Cambro-j Permian basins, an area of late Paleozoic intrusive and metamorphic rocks 3
, and the zone of mid-Paleozoic, post metamorphic thrust faulting represented in the site region by the Honey Hill-Lake Char fault zones.
Except for the Honey Hill-Lake Char fault zones, the Southeast New England Platform has undergo relatively little structural deformation or metamorphic alteration since the Paleozoic (225 million years before present-mybp).
Known faulting is related to basin development during the Cambrian-Permian (570 mybp to 220 mybp)
These basins include the Narragansett, Boston, North Scituate, Woonsocket, and Norfolk.
The White Mountain Plutonic series is an elongate, north northwest oriented group of alkaline intrusives that extend from northeastern Massachusetts through New Hampshire.
They were emplaced from Permian to Cretaceous.
As a result of reviews of the Indian Point 3, Seabrook, Montague, Pilgrim 2, and New England sites, the staff concluded that there was a spatial relationship between the zone defined by these intrusives, which represent the youngest significant deformation features in New England, and historic seismicity.
The largest New England earthquakes occurred within this zone.
The section of southern Connecticut in which the site is located is dom l
j by a large recumbent, isoclinally folded syncline, the Hunts-Brook syncline, the Il axial trace of which lies west of the site beneath Niantic Bay (USGS, 1970 in 07/18/81 I
5-2 MILLSTONE GEOLOGY SEP SEC 5 i
SER Mill > tone 2).
The axial trace of the syncline has a southerly trend but is sinuous due to later folding which produced secondary folds with east west axial I i traces.
The site is located on the south limb of one of these east-west
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folds.
Numerous faults have been identified in the site region.
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structures are described and evaluated in Section 5.2.
5.1. 2 Site Geology J
The site is located on a bedrock controlled peninsula that juts out into Long Island Sound between Niantic Bay on the west and the mouth of Jordan Cove on g
the east.
The topography in the site vicinity is attributable to Pleistocene j
a glaciation (1 mybp to 12,000 years bp).
The site is located on the south flank of Durfy Hill, an elongated north-south oriented hill.
Elevations slope from +50 feet mean sea level (msl) at the Penn Central railroad, about 1/2 mile
(.8 kilometer) north of the site, to -50 msl about 1/2 mile (.8 kilometer) south of the site in Long Island Sound.
Elevations at the site, and where f
Units 2 and 3 have been added north of Unit 1, range between +10 and +20 feet msl The site area is underlain by from approximately ten to fifty feet of soil over bedrock.
The soil consists of fill, up to 20 feet of ablation till and up to 40 feet of lodgement till over bedrock.
Bedrock is predominantly Monson gneiss, an early Paleozoic (pre-Silurian (?), more than 430 mybp) metamorphic rock.
The gneiss is intruded by dikes, sills and veins of rocks similar to the Westerly granite, which was emplaced during and after the Pennsylvanian Era (younger than 320 mybp).
The crystalline bedrock is hard, sound and moderately jointed.
Weathering occurs along the gneiss granite contacts, joints, and foliation partings.
All Category I structures are founded on bedrock, very compact lodgement till, or compacted structural backfill.
Several minor faults were mapped in the Millstone, Unit 3 excavation.
These faults were investigated extensively and found to be not capable within the intent of Appendix A to 10 CFR Part 100.
The excavation for Unit 1 was not geologically mapped.
It is likely that faults similar or equivalent to the ones mappeo at Unit 3 are present in the rock beneath Unit 1, however, there 07/18/81 5-3 MILLSTONE GEOLOGY SEP SEC 5
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j is sufficient basis to conclude that these faults are not capable.
The faults mapped in the excavation are discussed in Section 5.2 below.
l 5.2 Capability of Faults in the Site Region - Topic II-48 Several major faults or fault systems have been recognized in the site region.
Many of these have been identified and mapped during the NRC sponsored New England Seismotectonic Research Program that has been underway for the last six years.
The regional faults that are most significant to the Millstone 9
site include:
the Connecticut Valley border fault, the Honey Hill fault system, the New Shoreham fault, and mapped or postulated faults in the Narragansett Bay area.
The Connecticut Valley border fault forms the eastern boundary of the Connecticut Valley graben, or half graben.
The border fault, and graben were formed as a result of continental rifting during early and middle Mesozoic (225 mybp to 190 mybp).
There is no evidence that the fault has been active since that time.
The border fault is about 30 miles (48 kilometers) north-northwest of the site.
The Honey Hill fault system is described as a zone of highly strained cataclastic rock trending from Chester, Connecticut to North Stonington, Conn., where it intersects the north striking Lake Char fault system (Lundgren, 1968 and Lundgren and Ebblin, 1972).
It has been active during several tectonic regimes from Devonian through at least late Permian (395 mybp to 225 mybp).
During this time sense of movement along the fault system changed from strike slip to dip slip (thrust).
The thrust faulting is believed to be the result of the collision between a plate containing the Southeast New England platform and the plate containing the New England fold belt, during which the former I
was thrust under the latter.
Evidence of recent movement along the Honey Hill fault system was reported by h
Block and others (1979).
The evidence consisted of offset drill holes at highway rock cuts on Route 11 and Route 9, and along other artificial rock cuts.
These features were evaluated by Northeast Utilities Service Company in response to NRC questions concerning the SEP review of the Connecticut Yankee f
07/18/81 5-4 MILLSTONE GEOLOGY SEP SEC 5 b
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site.
As a result of that study it was concluded that the offsets were related to residual stress release caused by excavation of very large masses of myloni-tic rock (Weston Geophysical Corp., 1980).
This is not an uncommon phenomenon in quarries and other rock excavations in this region.
Geological mapping, LANDSAT imagery, and geophysical surveying during NRC-sponsored research efforts have identified other faults or postulated faults in the area around the Honey Hill fault system and the Moodus seismic h
The intersection of three major, apparently deep seated structures has area.
been mapped in the area north of Moodis.
These structures are the north-northwest striking Bonemill Brook fault, a large gravity anomaly that is 6
apparently related to structure that controls the course of the Connecticut River between Long Island Sound and East Haddam, and the northeast trending Higgannum dike system.
Whether this junction has anything to do with seismicity at Moodis has not been determined.
A fault east of, but probably part of the Bonemill Brook fault truncates southernmost splays of the Honey Hill fault system, however northernmost splays of the Honey Hill cut the Bonemill Brook fault.
The closest approach of the Honey Hill fault system is about 14 miles (22 kilometers) north of l
the site.
The New Shoreham fault was identified by McMaster (1971) based on his interpretation of seismic reflection data.
The fault strikes northwest and can be traced from about 42 miles (70 kilometers) out to sea to 6 miles (10 kilometers) west of Block Island.
The mapped fault is about 25 miles (40 kilometers) southeast of the site at its closest approach, however, a magnetic anomaly with a similar strike suggests that the fault extends to the vicinity of Fishers Island or about 15 miles (24 kilometers) southeast of the site.
Extensive investigations were conducted of the New Shoreham fault by the applicant during site studies for the New England Power Project, Units 1 and 2.
Af ter reviewing the results of that investigation the staff concluded that the New Shoreham fault was not capable within the meaning of Appendix A to 07/18/81 5-5 MILLSTONE GE0 LOGY SEP SEC 5
i.
The bases for that conclusion were:
(1) sediment filled ancestral stream channels that crossed the fault were not offset.
These channels were determined to be at least 43,800 years old, and more likely 4
greater than 120,000 years old; (2) sediment that overlies the southern end of the fault is not offset.
These deposits are estimated to be 20 million years ald; and (3) the distribution of historic seismicity shows no indication that the New Shoreham fault is a zone of increased seismicity.
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NRC sponsored research in the Narragansett Bay area of eastern Rhode Isla indicates that this area is one of a complex pattern of folding
, thrust faulting and high angle faulting.
The youngest are the high-angle faults, which are l
interpreted to have last moved in Late Permian and during the Mesozoic Era This area is more than 30 miles (48 kilometers) east of Millstone, however northeast-southwest trending major fault extends from this area to about
,a 15 miles (24 kilometers) east of the site.
Topographic and aeromagnetic lineaments suggest that this fault continues northeastward, well into the Narragansett Basin.
The fault, called the Watch Hill fault, separates two domains of slightly different structural trends.
It is possible, though not demonstrated, that the Watch Hill fault could continue southwestward into Island Sound and thus could pass as close as 10 miles (16 kilometers) southe of the site.
There is no evidence that the fault is any younger than Mesozoic.
We do not consider the Watch Hill fault to be a capable fault.
Closer to the site, the Millstone 3 SER (AEC,1974) describes an unnamed
, north-south trending inferred fault that is approximately 10 miles (16 kilometers) l as being present 10 1/2 miles (17 kilometers) northeast of the site.
A projec-tion of the inferred fault trace would bring it to about 7 miles (11 kilometers) east of the site.
The staff concluded that this fault, if it exists, is associated with Triassic tectonic activity (190 mybp), and therefore not capable.
Excavations for the Unit 3 reactor began in 1973 and continued as construction progressed for several years.
During this period numerous faults were discovered in the excavations.
Most of the faults were minor with displacements of fractions of an inch to several inches, and overall length confined to the excavations.
Several faults, however, were larger and more continuous.
These were recognized by offset pegmatite dikes, brecciation, and topographic lows caused by scou 07/18/81 5-6 MILLSTONE GE0 LOGY SEP SEC 5
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of the fractured rock during glaciation.
None of the faults offset overlying glacial deposits.
The larger faults had strikes ranging from North 15 West to North 15" East and dips that varied from vertical to high angles (more than 70 )
toward the east.
Displacements ranged from one foot to 35 feet of strike slip movement with widths of faults varing from 4 inches to 2 feet.
The applicant conducted detailed investigations of these faults by thin section analysis, analysis of fluid inclusions of quartz crystals, potassium-argon radiometric dating, and analysis of the regional and local geologic l
history.
Based on these studies, the applicant concluded that the faults were at least 100 million years old.
j The staff reviewed the applicant's data, conducted numerous geological reconaissances of the site and excavation, and contracted an independent consultant to review the fault dating techniques used by the applicant.
Based on its review the staff concluded that the site faults were ancient, and therefore not capable acording to the criteria set forth in Appendix A, 10 CFR Part 100.
The excavations for Millstone, Unit 1 were not geologically mapped.It is likely that the larger throughgoing faults mapped at Unit 3 continue into the Unit 1 area.
It is also likely that numerous minor faults similar to those mapped with limited extent within the Unit 3 excavation are present beneath Unit 1.
Based on our study of the regional geology and the detailed work at Unit 3, we conclude that the faults beneath Unit 1 are also not capable.
07/18/81 5-7 MILLSTONE GE0 LOGY SEP SEC 5
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6 CONCLUSION We conclude that the data that has become available since the original site review confirms the staff's conclusions made at that time, that there are no geologic hazards that would affect the safety of the Millstone, Unit I site.
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REFERENCES 1.
Barosh, P.
J., 1981, Structural Setting of the Moodis Earthquakes South-Central Connecticut, in New England Seismotectonic Study, Activities During FY 1979, ed. P. J. Barosh, USNRC NUREG/CR-2131, pp. 93-97.
2.
Barosh, P.
J., 1981, Structural Geology of Southern Rhode Island, in New England Seismotectonic Study, Activities During FY 1979, ed. P. J.
Barosh, USNRC NUREG/CR-2131, pp.98-103.
3.
Block, J. W., Clement, R. C., Lew, L. R., and de Boer, J., 1979, Recent Thrust Faulting in Southeastern Connecticut:
Geology, vol. 7, no. 2, pp. 79-82.
4.
Eardley, A.
J., 1973, Tectonic Divisions of North America, in Gravity and Tectonics, edited by DeJong and R. Scholten, John Wiley Publishing Co.
5.
Fenneman, N. M., 1938, Physiography of the Eastern United States, McGraw-Hill Book Company, New York, p. 714.
6.
Hadley, J. B. and Devine, J. F., 1974, Seismotectonic Map of the Eastern United States:
U.S. Geological Survey Miscellaneous Field Studies Map MF-620.
7.
Kick, J. F., 1981, Gravity Studies in South-Central Connecticut, in New England Seismotectonic Study, Activities During FY 1979, ed. P. J.
Barosh, USNRC NUREG/CR-2131, pp. 80-85.
8.
King, P. B., 1969, Discussion to Accompany the Tectonic Map of North America, USGS-Department of the Interior Publication.
9.
London, D., 1981, Fault Study of the Moodis Seismic Area South Central Connecticut, in New England Seismotectonic Study, Activities During FY 1979, ed. P. J. Barosh, USNRC NUREG/CR-2131, pp. 86-92.
07/18/81 R-1 MILLSTONE GE0 LOGY SEP REF
O 10.
Lundgren, L. W., and Eblin, C., 1972, Honey Hill fault in Eastern Connecticut:
Regional Relations:
Geological Society of America Bull.,
Vol. 83, pp. 2773-2794.
11.
Lundgren, L. W., 1968, The Honey Hill and Lake Char faults, in Orville, P. M., ed., Guidebook for field trips in Connecticut, New England Intercollegiate Geol. Conf., 60th Annual Meeting, Oct. 25-27, 1968:
Connecticut State Geological and Natural History Survey Guidebook 2,
- p. 1-1, 1-8.
12.
McMaster, R. L.,1971, A Transverse Fault on the continental shelf off Rhode Island:
Geological Society of America Bull., vol. 82, pp. 2001-2004.
1 13.
Millstone Point Company et. al.,1975, Millstone Nuclear Power Station, i
Unit 3, Geologic Mapping of Bedrock Surface, April, 1975.
l 14.
- Rodgers, J., 1972, Latest Precambrian (Post-Grenville) Rocks of the Appalachian Region, Amer. Journal of Sc., Vol. 272, June 1972, pp. 507-520.
15.
- Rodgers, J., 1970, The Tectonics of the Appalachians, Interscience Publishers, New York.
16.
Thornbury, W. D., 1965, Regional Geomorphology of the United States, John Wiley and Sons, Inc., New York.
17.
U.S. Atomic Energy Commission, 1974, Safety Evaluation Report for Millstone Point Nuclear Power Station, Unit No. 3, Docket No. 50-423, March 13, 1974.
18.
U.S. Atomic Energy Commission, 1970, Safety Evaluation Report for Millstone Nuclear Power Station, Unit No. 1, Docket No. 50-245.
19.
U.S. Atomic Energy Commission, 1970, Safety Evaluation Report for the Millstone Nuclear Power Station, Unit No. 2, Docket No. 50-336, August 7, 1970.
07/18/81 R-2 MILLSTONE GEOLOGY SEP REF
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C 20.
U.S. Nuclear Regulatory Commi;sion, 1979, Safety Evaluation Report for N
New England Power Project, Units 1 and 2, Supplement No. 1, Docket Nos. 50-568 and 569, July 1979.
21.
U.S. Nuclear Regulatory Commission,1977, Safety Evaluation Rer, ort for Pilgrim Nuclear Generating Station, Unit No. 2, Supplement No.- 3, Augub't, 1977.
s 22.
Weston Geophysical Corporation,1980, NRC Information Request on Gealogy and Seismology Haddam Neck Site, prepared for Northeast Utilities Service Company, March, 1980.
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