ML20027A556
| ML20027A556 | |
| Person / Time | |
|---|---|
| Site: | Yankee Rowe |
| Issue date: | 12/13/1978 |
| From: | Levin H Office of Nuclear Reactor Regulation |
| To: | Desiree Davis Office of Nuclear Reactor Regulation |
| References | |
| TASK-***, TASK-02-03.A, TASK-02-03.B, TASK-02-03.C, TASK-02-04, TASK-02-04.A, TASK-02-04.B, TASK-02-04.C, TASK-2-3.A, TASK-2-3.B, TASK-2-3.C, TASK-2-4, TASK-2-4.A, TASK-2-4.B, TASK-2-4.C, TASK-RR NUDOCS 7812260026 | |
| Download: ML20027A556 (6) | |
Text
.. ~.
'[
UNITED STATES NUCLEAR REGULATORY COMMISSION yw 4
{ [ W) l)
WASHINGTON. D. C. 20555
\\, L l CEC 131978 Docket No.
50-29 MEMORAWDUM FOR: Donald K. Davis, Chief T
Systematic Evaluation Program Branch, D0R FROM:
Howard A. Levin, Systematic Evaluaiton Program Branch, DOR
SUBJECT:
SUMMARY
OF MEETING WITH YANKEE ATOMIC ELECTRIC COMPANY - GE0 LOGY, HYDROLOGY, GE0 TECHNICAL AND SEISMIC REVIEW On November 8,1978, members of the NRC staff met with representatives of Yankee Atomic Electric Company (YAEC) (Attendees listed in ) to tour the Yankee Rowe site, Sherman Dam, and Harriman Dam; to discuss technical questions relative to the Systematic Evalu-ation Program (SEP) review of site geology, hydrology and the plant geotechnical design; and to identify and obtain information not available on the Yankee Rowe docket.
The morning session included a presentation on the regional and local geology by J. Rand of Weston Geophysical, including a briefing on geologic and seismic investigations in progress at Yankee Rowe, and eligineering discussions involving the geotechnical design of plant structures, Sherman Dam and Harriman Dam. Concurrent with this session,
-Edward Hawkins of the Hydrology and Meteorology Branch, DSE, toured the 1
'.Yc7kee Rowe site to gain first hand knowledge of the site drainage plan as part of the SEP hydrology review.
l The meeting opened with a discussion by Howard Levin of the Systematic Evaluation Program Branch, addressing the purpose of the visit and the i
scope of review including an overview of how the information gained I
will be incorporated within the SEP topical review. The following l
tcpics were considered at the meeting:
II-4 Geology and Seismolocy II-4.B Proximity of Capable Tectonic Structures l
in Plant Vicinity l
II-4.0 Stability of Slopes l
II-4.E Dam Integrity II-4.F Settlement of Foundations and Buried i
Equipment
(
i m
CEC 13 870 Donald K. Davis It was explained that information on topics II-4 and II-4.B including a description of the site soil and rock profile and corresponding engineerir.g properties, is necessary as input to the overall seismic review of topic III-6, Seismic Design Considerations. This information will serve both as input into the Lawrence Livermore Laboratory (LLL)
Site Specific Spectra evaluations and as a basis for the staff's overall review of geologic and seismic hazards at Yankee Rove. The licensee asserted that the information will be available by January 1, 1979 which will be in time for the LLL work. YAEC has undertaken a significant effort in this area. An Interim Report, " Geology and Seismology - Yankee Rowe Nuclear Power Plant," dated October 13, 1978 has been prepared for YAEC by Weston Geophysical Corporation which addresses issues of interest to the staff and its consultants.
This report will be docketed when it.is complete.
Settlement of foundations and buried equipment was considered next.
The licensee indicated that plant structures are founded on dense glacial till which has a compression wave velocity of 6,500 ft./sec.
and an estimated shear wave velocity of 2,200 ft./sec. These figures will later be verified pending the conclusion of the Weston seismic refraction studies which are in progress. The licensee agreed to supply the staff with detailed foundation drawings of all safety related structures including foundation details of piping going out into the pond.
It was indicated that 80% of the weight of the containrxnt was in place for a year prior to the connection of piping and that most of any anticipated settlement would occur by that time. Additionally, it was noted that field settlement markers were used and that records were taken during construction. The licensee is searching the files of Stone and Webster, the plant architect-engineer-constructors to locate any field notebooks on the subject.
The integrity of the folicwing earth dams was discussed with respect to the potential impact on the plant from flooding or a loss of ultimate heat sink.
1.
Sherman - located at the site 2.
Harriman - located approximately 6 miles upstream of the site on the Deerfield River 3.
Somerset - located approximately 13 miles upstream of Harriman Dam
Donald K. Davis The licensee indicated that he is studying the issue of one or multiple dam failures with a perspective of potential consequences in an effort to determine whether dynamic stability analyses are required. He stated that a failure of Somerset would not acversely affect Harriman Dam and that a previous analysis addresses this subject. Details will be submitted when available. YAEC is in contact with New England Power Company (NEPCo), owner of the dams, to establish details of design and construction. The licentee indicated that it would be possible to extrapolate the bedrock profile under Sherman Dam using data obtained during the seismic refraction studies. He is also pursuing additional information to define the river bed profile. The following pertinent reports have been identified:
1.
Report No. YAEC-ll39, " Yankee Nuclear Station - Probable Maximum Flood Analysis," Steven C. Ooret, July 1977 Note: This report includes the 1973 Federal Power Commission dam inspection reports. The report is preliminary and will be docketed when it becomes final.
2.
" Inspection Report of the New England Power Company Deerfield River Project," Federal Power Commission Project No. 2323, September 1968 "Thi d Inspection Report of the New England Power Company 3.
r Deerfield River Project," Federal Energy Regulatory Commission, 1978.
The licensee indicated that modifications to Harriman Dam to increase its height 10 feet had previously been completed and that he is attempting to locate a report or drawings which address,the modification, The morning session ended with a tour of the site and surrounding area that included observations along the banks of Sherman Reservoir. The tour was designed to give the staff an appreciation of local topography and geology. Certain geologic features were highlighted by Weston Geophysical to complement the discussions documented in the bef]re mentioned interim report.
The afternoon session convened at Harriman Dam. A representative from New England Power Co. was available to answer staff questions. The tour included observations of the dam abutments, embankment and
.==...
i 1
OEC i 3 1973 i
i Donald K. Davis
-4..
spillway. The tour proceeded to Sherman Dam where similar observations were made.
(
t
/
v%
Mt.T.
l Howard A. Levin Systematic Evaluation Program Branch, DOR i
Enclosures:
l l
As stated d
i 1
i f
4 1
i l
i 4
J 4.
.-,.,m,m_..._
_.,......, ~. -,, _ - -,,, -. -,,.
ENCLOSURE 1 LIST OF ATTENDEES SITE VISIT - YANKEE R0WE SHERMAN DAM, HARRIMAN CAM NRC Howard Levin, SEP8/00R Edward Hawkins, HMB/OSE Thomas Cardone, GSB/DSE Thomas Cheng, SEP8/00R YANKEE ATOMIC J. Stacey D. Hansen R. MacPherson B. Jones S. Doret N. St. Laurent (Yankee Rowe)
WESTON GE0 PHYSIC _AL_
R. Holt E. Levine J. Rand
-