ML20002D263
| ML20002D263 | |
| Person / Time | |
|---|---|
| Site: | Yankee Rowe |
| Issue date: | 12/17/1980 |
| From: | Crutchfield D Office of Nuclear Reactor Regulation |
| To: | Kay J YANKEE ATOMIC ELECTRIC CO. |
| Shared Package | |
| ML20002D264 | List: |
| References | |
| TASK-02-02.A, TASK-2-2.A, TASK-RR LSO5-80-12-038, LSO5-80-12-38, NUDOCS 8101200200 | |
| Download: ML20002D263 (7) | |
Text
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UNITED STATES e
7, NUCLEAR REGULATORY COMMISSION y
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- j WASHINGTON, D. C. 20555.
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Dec 171980 Docket No. 50-29 di i
LS05-80-12-038 g
a Mr. James A. Kay
'c Senior Engineer - Licensing
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Yankee Atomic Electric Company Qp
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,g 25 Research Drive a
Westborough, Massachusetts 01581 R
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Dear Mr. Kay:
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SUBJECT:
YANKEE R0WE - SEP TOPIC II-2.A The SEP review of Topic II-2.A, " Severe Weather Phenomena" has been completed. is the staff's safety evaluation (SE) for the Yankee Rowe site. The review was done in conformance with Standard Review Plan 2.3.1 and covers extreme temperatures, lightning strikes, snow and ice loads and wind and tornado loadings.
The wind and tornado loadings analysis was performed by the Texas Tech. University, Institute for Disaster Research. Enclosure 2 is the Texas Tech. report.
Please inform us if your as-built facility differs from the licensing basis assumed in our assessment within 30 days of receipt of this letter.
You will note that the SE identifies a design basis tornado with a probability of 10-7 per year and is consistent with a Regulatory Guide 1.76 design basis tornado.
The staff intends to evaluate the structural characteristics of specific structures, systems and components important to safety to determine their ability to withstand the severe weather loadings.
The plant design parameters will then be compared to the probability of occurrence of the wind as a part of our structural evaluation. This comparison will be used to evaluate the necessity of design changes.
Sincerely, Dennis M. Crutchtield, CF r Operating Reactors Branc #5 Division of Licensing
Enclosures:
As stated cc w/ enclosures:
See next page b 1 G l '? O G NC7 f
j Mr. James A. Kay YANKEE-ROWE ATOMIC POWER STATION i
DOCKET NO. 50-29 cc Mr. James E. Tribble, President Yankee Atomic Electric Conpany 25 Research Drive Westborough, Massachusetts 01581 l
l Greenfield Cormunity College l
1 College Drive Greenfield, Massachusetts 01301 Chairman Board of Selectmen Tcwn of Rowe Rowe, Massachusetts 01367 Energy Facilities Siting Council lith Floor i
One Ashburton Place Boston, Massachusetts 02108 Director, Technical Assessment Division Of fice of Radiation Programs (AW-459)
U. S. Environmental Protection Agency Crystal Mall #2 Arlington, Virginia 20460 U. S. Environmental Protection Agency Region I Office ATTN: EIS COORDINATOR JFK Federal Building Boston, Massachusetts 02203 ResiJent Inspector Yankes Rowe Nuclear Power Station tbfi Box 28 Monroe Bridge, Massachusetts 01350 r
L b
ENCLOSURE 1 Systematic Evaluation Program Meteorology Yankee Rowe Atomic Power Station Topic II-2.d Severe Weather Phenomena Extreme meteorological conditions and severe weather phenomena in the Yankee Rowe site region were examined to determine if safety-related structures, systems, and components are designed to function under all severe weather conditions.
Discussed below are the severe weather phenomena which could adversely affect the Yankee Rowe site and which should be examined relative to the current design.
I Normal daily temperatures range from a minimum of 10 degrees Fahrenheit in January to a maximum of 80 degrees Fahrenheit in July. Measured extreme temperatures for the site region are 95 degrees Fahrenheit which occurred in July 1956 and -25 degrees Fahrenheit which occurred in February 1943. The extreme maximum and minimum temperatures appropriate at the Yankee Rowe site for general plant design (i.e., HVAC systems) are 88 degrees Fahrenheit (equalled or exceeded IK of the time) and
-12 degrees Fahrenheit (equalled or exceeded 99% of the time).
Thunderstorms occur an average of 28 days per year in the site region.
Based on the annual number of thunderstorm days, the calculated annual flash density of ground lightning strikes is four flashes per square u
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kilometer. A structure with the approximate dimensions of th'e Yankee Rowe reactor building can be expected to be subjected, on the average, to onc strike every nine years.
The design wind speed (define as the " fastest-mile" wind speed at a height
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of 30 feet above ground level with a return period of 100 years) acceptable for the site region is 80 miles per hour. On the average, hail storms occur about two days annually, and freezing rain occurs approximately 12 days per n
year.
The maximum radial thickness of ice expected in the site region is about 1.25 inches.
'!ean annual snowfall in the site region totals 100 inches, resulting in a normal winter precipitaion snow load on a flat surface of about 40 oounds per square foot.
A maximum monthly snowfall occurred in March 1950, totaling 40.2 inches which also resulted in the maximum measured snow depth on the ground. The combination of the 100 - year ground snowpack and the probable maximum winter precipitation results in a snow load of 125 pounds per square foot in the site region.
Tornadoes have been reported 94 times during the period 1950-1977 within an approximate 60-mile radius from the Yankee Rowe, site. On the average, three tornadoes can be expected to occur in the vicinity of the Yankee Rcwe A
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site every year. Based on tne path length and width data from tornadoes occurring in the site region, the recurrence interval for a tornado at the site is calculated to be about 7850 years.
The assunptions used in Regulatory Guide 1.76 provide an adequate design basi; tornado for the site region. These characteristicr include a maxinum windspeed of 360 miles per hour (a maximum rotational windspeed of 290 miles per hour plus a maximum translational windspeed of 70 miles per hour), a maximum pressure drop of three pounds per square inch, and rate of pressure drop of two pounds per square inch per second.
Based on actual tornado occurrences in the site region area (66 tornadoes with available data) and using the procedures discussed in WASH-1300, a
" site-specific" design basis tornado (with a probability of occurrence of 10-7 per year) can be calculated. For the Yankee Rowe site, the characteristics of cornadoe; occurring within a 60-mile radius are a maxinum windspeed of 300 miles per hour (a maximum rotational windspeed of 240 miles per hour plus a maximum translational windspeed of 60 miles per hour),
a maxinum pressure drop of two pounds per square inch, and a rate of pressure drop of one pound per square inch per second.
O l
References U.S. Department of Conrnerce, NOAA, " Climates of the States,".Vol. I',
1974.
U.S. Department of Consnerce " Climatic Atlas of the United States,"
June 1968.
U.S. Department of Commerce, NOAA, " Climates of the United States,"
1973.
U.S. Department of Consnerce, NOAA, " Local Climatological Data "
Albany, New York,1976.
H. C. S. Thom, "New Distributions of Extreme Winds in the United States,"
Journal of the Structural Division ASCE, Vol. 94, No. ST7, July 1968.
"American National Standard Building Code Requirements for Minimum Design Loads in Buildings and Other Structures," ANSI, A58.1-1972.
" Seasonal Variation of the Probable Maxinum Precipitation East of the 105th Meridian for Areas from 10 to 1,000 Square Miles and Durations of 6,12, 24, and 48 Hours," Hydrometeorological Report No. 33, Washington, D. C., April 1956.
i James A. Ruffner and Frank E. Baier, "The Weather Almanac," Gale Research Conpany,1974.
David M. Ludlum, " Weather Record Book," Weathemise, Inc.,1973.
J. L. Marshall, " Lightning Protection," John Wiley and Sons, New York, 1973.
"ASHRAE Handbook of Fundamentals," American Society of Heating, Refrigeration and Air Conditioning Enginer.rs, Inc., New York 1976.
Paul Tattleman and Irving I. Gringorten, " Estimated Glaze Ice and Wind Loads at the Earth's Surface for the Contiguous United States,"
^
Air Force Cambridge Research Laborstories, October 1973.
U.S. Housing and Home Finance Agency, " Snow Load Studies," Housing Research Paper No.19, May 1952.
l U.S. Naval Weather Servi'.e. "World-Wide Airfield Summaries," Vol. VIII, United States of America, Part 4,1969.
Memo from Harold R. Denton (Assistant Director for Site Safety, Division of Technical Review, NRR) to R. R. Maccary (Assistant Director for U
Engineering, Division of Technical Review, NRR) dated March 24, 1975,
Subject:
Site Analysis Branch Position - Winter Precipitation Loads.
Memo from Jerry Harbour (Chief, Site Safety Research Branch, Division
. (,
of Reactor Safety Research, RES) to L. G. Hulman (Chief, Hydrology-6 Meteorology Branch, Division of Site Safety and Environmental Analysis, l
NRR) dated August 14, 1978,
Subject:
Tornado Frequency Data for SEP Review.
Regulatory Guide 1.76, " Design Basis Tornado for Nuclear Power Plants,"
U.S. Nuclear Regulatory Commission, Washington, D.C.
WASH-1300, " Technical Basis for Interim Repional Tornado Criteria,"
U.S. Atomic Energy Commission, May 1974.
H. C. S. Thom, " Tornado Probabilities," Monthly Weather Review, October-December 1963, pp. 730-736.
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