ML20062G197
| ML20062G197 | |
| Person / Time | |
|---|---|
| Site: | Haddam Neck File:Connecticut Yankee Atomic Power Co icon.png |
| Issue date: | 12/13/1978 |
| From: | Levin H Office of Nuclear Reactor Regulation |
| To: | Desiree Davis Office of Nuclear Reactor Regulation |
| References | |
| TASK-02-04, TASK-2-4, TASK-RR NUDOCS 7812270106 | |
| Download: ML20062G197 (4) | |
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UNITED STATES I
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NUCLEAR REGULATORY COMMISSION f.Q j
WASHINGTCN. O. C. 20555
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7 Docket No. 50-213 k
'gc il 9 MEMORATIDUM FOR: Donald K. Davis, Chief Systematic Evaluation Program Branch, COR FROM:
Howard A. Levin, Systematic Evaluation Program Branch, COR
SUBJECT:
SUMMARY
OF MEETING WITH CCNNECTIC'T YANKEE ATOMIC J
POWER COMPANY - G' OLOGY GEOTECHNICAL AND SEISMIC REV104 On November 7, 1978, members of the NRC staff met with representatives of Connecticut Yankee Atomic Power Co. (CYAPC) and Northeast Utilities Service Company (NUSCo) (Attendees listed in Enclosure 1) to tour the Connecticut Yankee site, to discuss technical questions relative to the Systematic Evaluation Program (SEP) review of site geology and the geotechnical design of the plant and to identify and obtain information not available on the Connecticut Yankee docket.
The meeting opened with a discussion by Howard Levin, of the Systematic Evaluation Program Branch addressing the purpose of the visit, and the scope of review including an overview of how the infor-nation gained will be incorporated within the SEP topical review. The discussions focused on the SEP topics.
II A Geology and Seismology 4'
II 4.3 Proximity of Capable Tectonic Structures in Plant Vicinity II-4.0 Stability of Slopes II 4.F Settlement of Foundations and Suried Equipment The staff explained that information on topics II 4 and II 4,3 is necessary as input to the overall seismic re-evaluation under review in topic III-6, Seismic Design Considerations. Specifically the basic site and regional gec,igic information including the engineering properties of the site ill serve both as input into the Lawrence Livermore Laboratory (W, Site Specific Spectra evaluations and as a basis for the staff's overall review of geologic and seismic ha::ards at Connecticut Yankee.
7812270106
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ttt i 1 93 Ocnald X. Davis The licensee established that the logs of borings and their locations as documented in Figures 2.4-1 thru 2.4 4 of the FSAR were the only records available. The staff questioned the licensee about certain logs that appeared to be missing. NUSCo agreed to look into this further.
Settlement of foundations and buried equipment was considered next.
Together the licensee and staff reviewed foundation drawings which indicated that the following Category I structures are founded on rock with the exception noted.
1.
Containment Building 2.
Primary Auxiliary Building 3.
Fuel Storage Building 4
Service Building (2 spread footings on soil) 5.
Screen House It was indicated that settlement had not been monitored through monument observations. However, no evidence of settlemeint cracking was observed during the site tour. The licensee indicated that the shear wave velocity of the rock exceeds 3000 feet per second. Based upon the fact that all principal safety related structures are founded on rock, that the rock is expected to be very competent and that settlement cracking was not observed, it would appear that settlement of foundatiens is not a problem.
Information regarding the foundation of buried piping was not available at the meeting. The licensee comitted to providing this information in addition to detailed foundation drawings of the above structures, i.
One major slope exists on the north side of the reactor containment building, primary auxiliary building and the fuel storage building.
riowever, there is significant evidence of rock outcropping and light overburden. Therefore stability of this slope as it may affect these structures during a seismic disturbance, is not expected to be a problem.
The site tour included observations within the site and along the site I
boundaries. The tour was designed to give the staff an appreciation of l
local topography and geology. The geologic observations were of particular interest because of recent preliminary mappings of faults in the area by P. Barosh of Weston Observatory, NRC consultant to tne Office of Nuclear Regulatory Researc.h. The staff is currently interacting with Dr. Barosh i
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Ocnald K. Davis in an e ~:4rt to fully understand the significance of his findings.
The lit.ensee will be kept informed of any findings including the need for his participation.
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.w Howard A. Levin Systematic Evaluation Program Branch, 00R
Enclosures:
As Stated i
4 ENCLOSURE 1 LIST OF ATTENCEES SITE VISIT - CONNECTICUT YANKEE NOVE.MBER 7, 1978 4
NRC Howard Levin, SEPS/COR Thomas Cheng, SEPS/ DOR y
Thomas Wambach, ORB #2/COR Thomas Cardone, GSB/DSE CYAPC John Ferguson, Senior Engr., Haddam Neck Plant R Gracie, Operations Engr., Haddam Neck Plant NUSCo Barry Ilberman, Licensing Engr.
J. F. Bibby, Assoc Engr, Civil Engr, Group W. R. Rotherforth, Sentor Engr, Civil Engr, Group
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1 MEETING SL'MMARY DISTRIBUTION central rises pt NRC PDR Local POR SEPB Reading NRR Reading, H. Denton E. Case V. Stello D. Eisenhut B. Grimes T. Ippolito R. Reid j
G. Knighton V. Nocnan 4,
A. Schwencer
- 0. Ziemann D. K. Davis G. Lainas P. Check J. Scinto, OELD OI&E (3)
R. Fraley, ACRS (16)
H. Smith SEPB Members (13)
Licensee CYAPC J. Ferguson R. Gracie NUSCO G erman J. Bibby W. Rotherforth t
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