ML19340F171
| ML19340F171 | |
| Person / Time | |
|---|---|
| Site: | Oyster Creek |
| Issue date: | 12/17/1980 |
| From: | Crutchfield D Office of Nuclear Reactor Regulation |
| To: | Finfrock I JERSEY CENTRAL POWER & LIGHT CO. |
| Shared Package | |
| ML19340F172 | List: |
| References | |
| TASK-02-02.A, TASK-2-2.A, TASK-RR LSO5-80-12-040, LSO5-80-12-40, NUDOCS 8101210218 | |
| Download: ML19340F171 (7) | |
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jo UNITED STATES g
8 NUCLEAR REGULATORY COMMISSION o
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prn 1. 7 1980 Docket No. 50-219 i
LS05-80-12-040
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Mr. I. R. Finfrock, Jr.
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Vice President - Jersey Central gi 1:
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Power & Light Company ri M
Oyster Creek Nuclear Generating Station
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P. O. Box 388 Forked River, New Jersey 08731
Dear Mr. Finfrock:
SUBJECT:
,0YSTER CREEK - SEP TOPIC II-2.A SEVERE WEATHER PHENOMENA The SEP review of Topic II-2.A. " Severe Weather Phenomena" has been completed. is the staff's safety evaluation (SE) for the Oyster Creek 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 infonn us if your as-built facility differs from the licensing basis assumed in our assessment within 30 days of receipt of this letter.
j You wi}l note that the SE identifies a design basis tornado with a probability of 10- 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, N2/Y AdennisM.Crutchfiel,GIiU' Operating Reactors Branch #5 Division of Licensing
Enclosure:
As stated cc w/ enclosure:
See next page CI01210 k N
Mr. I. R. Finf rock, J r.
0YSTER CREEK NUCLEAR GENERATING STATION, UNIT NO. 1 DOCKET NO. 50-219 cc G. F. Trowbridge, Esquire Gene Fisher Shaw, Pittman, Potts and Trowbridge Bureau Chief 1800 M Street, N. W.
Bureau of Radiation Protection Washington, D. C.
20036 380 Scotts Road Trenton, New Jersey 08628 GPU Service Corporation ATTN: Mr. E. G. Wallace Connissioner Licensing Manager New Jersey Department of Energy 260 Cherry Hill Road 101 Connerce Street Parsippany, New Jersey 07054 Newark, New Jersey 07102 Natural Resources Defense Council Plant Superintendent 91715th Street, N. W.
Oyster Creek Nuclear Generating Washington, D. C.
20006 Station P. O. Box 388 Forked River, New Jersey 08731 Steven P. Russo Esquire 248 Washington Street Resident Inspector P. C. Box 1060 c/o U. S. NRC Toms River, New Jersey 08753 P. O. Box 128 Forked River, New Jersey 08731 Joseph W. Ferraro, Jr., Esquire
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Deputy Attorney General Director, Technical Assessment Div.
State of New Jersey Office of Radiation Programs Department of Law and Public Safety (AW-459) 1100 Raymond Boulevard U. S. Environmental Protection Newark, New Jersey 07012 Agency Crystal Mall #2 Ocean County Library Arlington, Virginia 20460 Brick Township Branch 401 Chambers Bridge Road U. S. Environmental Protection Brick Town, New Jersey 08723-Agency Region II Office Mayor ATTN: EIS COORDINATOR Lacey Township 26 Federal Plaza P. O. Box 475 New York, New York 10007 Forked River, New Jersey 08731 Connissioner Department of Public Utilities State of New Jersey j
101 Connerce Street Newark, New Jersey 07102 l
ENCt.05URE 1 Systematic Evaluation Program Meteorology Oyster Creek Nuclear Generating Station Topic II-2.A Severe Weather Phenomena Extreme meteorological conditions and severe weather phenomena in the Oyster Creek site region were examined to determine if safety-related structures, systems, and components are designed to function under all seve.re weather conditions. Discussed below are the severe weather phenomena which could adversely affect the Oyster Creek site and which should be examined relative to the current design.
Normal daily temperatures range from a minimum of 25 degrees Fahrenheit
' n Janu'ary to a maximum of 82 degrees Fahrenheit in July. Measured i
extreme temperatures for the site region are 103 degrees Fahrenheit which occurred in July 1957 and -16 degrees Fahrenheit which occurred in January 1957. The extreme maximum and minimum temperatures appropriate at the Oyster Creek site for general plant design (i.e., HVAC systems) are 92 degrees Fahrenheit (equalled or exceeded 1% of the time) and 7 degrees Fahrenheit (equalled or exceeded 99% of the time).
Thunderstorms occur an average of 20 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 three flashes per square m
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kilometer. A structure with the approximate dimensions of the Oyster Creek j
reactor building can be expected to be subjected, on the average, to one l
strike every 13 years.
The design wind speed (defined as the " fastest-mile" wind speed at a height of 30 feet above ground level with a return period of 100 years) acceptable for the site region is 12b miles per houd On the average, hail storms occur about one day annually, and freezing rain occurs approximately four days per.
year. The naximum radial thickness of ice expected in the site region is about 0.75 inch.
Mean annual snowfall in the site region is approximately 22 inches, with a i
normal winter precipitation snow load on a flat surface of about 20 pounds per square foot. The maximum monthly snowfall occurred in February 1967 and totaled 35.2 inches. The maximum snowfall from a single storm totaled 26.7 inches in December 1947. The maximum measured snow depth on the ground for the site region is 30 inches. Based on the 100-year recurrence accumulated ground snowpack and probable maximum winter precipitation for the site region, results in an extreme winter precipitation snow load on a fla't surface of about 75 pounds p
per square foot, t
Tornadoes have been reported 53 times during the period'1950-1977 within an approximate 60-mile radius from the Oyster Creek site, excluding the water area over the Atlantic Ocean. On the average, two tornadoes can be expected to occur v
s T 1 in the vicinity of the Oyster Creek site every year. Based on the 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 5300 years.
The assumptions used in Regulatory Guide 1.76 provide an adequate design basis tornado for the site region. These characteristics include a maximum windspeed of 360 miles per hour (a maximum rotational windiged of 290 miles per hour plus a maximum translational windspeed of 70 mile.s per hour), a maximum pressure drop of three pounds per square inch, and rate f
of pressure drop of two pounds per square inch per second.
i Based on actual tornado occurrences in the site region area and using the proceires discussed in WASH-1300, a " site-specific" design basis tornado (with a probability of occurrence of 10-7 per year) can be calculated.
I For the Oyster Creek site, the characteristics of tornadoes occurring within a 60-mile radius are a maximum windspeed of 310 miles per hour (a maxinum rotational windspeed of 250 miles per hour plus a maxinum 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. Because of the relative infrequent occurrence of tornadoes in the site region (only 46 tornadoes in 28 years had sufficient data for calculations), the site specific tornado charactreristics are based on a small sample of data which we believe does not provide a reasonable degree of accuracy for calculation of safety-related structure design.
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r References U.S. Department of Commerce, NOAA, " Climates of the States," Vol. 1 1974.
i U.S. Department of Commerce " Climatic Atlas of the United States,"
l June 1968.
U.S. Department of Consnerce NOAA, " Climates of the United States,"
1973.
U.S. Department of Consnerce, NOAA, " Local Climatological Data "
p Newark, Trenton and Atlantic City, New Jersey.
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 Mininum Design Loads in Buildings and Other Structures," ANSI, A58.1-1972.
l j
" 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, i
Washington, D. C., April 1956.
1 James A. Ruffner and Frank E. Baier, "The Weather Almanac," Gale Research Conpany,1974.
g David M. Ludlum, " Weather Record Book," Weathentise, 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 Engincars. 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 Can6 ridge Research Laboratories, October 1973.
U.S. Housinf and Home Finance Agency, " Snow Load Studies," Housing Research Pa' er No.19, May 1952.
U.S. Naval heather Service, "World-Wide Airfield Suninaries
- Vol. VIII.
United Staten of America, Part 4,1969.
Memo from Harold R. Denton (Assistant Director for Site Safety. Division of Technical Review, h3R) to R. R. Maccary (Assistant Director for
Engineering, Division of Technical Review, NRR) dated March 24, 1975,
Subject:
Site Analysis Branch Position - Winter Precipitation Loads.
r Memo from Jerry Harbour (Chief. Site Safety Research Branch, Division of Reactor Safety Research, RES) to L. G. Hulman (Chief Hydrology-Meteorology Branch, Division of Site Safety and Environmental Analysis, NRR) dated August 14,1978
Subject:
Tornado Frequency Data for SEP Review.
Regulatory Guide 1.76, "Disign Basis Tornado for Nuclear Power Plants,"
U.S. Nuclear Regulatory Comission, Washington, D.C.
j WASH-1300, " Technical Basis for Interim Regional Tornado Criteria "
U.S. Atomic Energy Comission, May 1974.
H. C. S. Thom, " Tornado Probabilities," Monthly Weather Review, October-December 1963, pp. 730-726.
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