ML17258A292

Forwards Final Evaluation of SEP Topic II.2.A Re Severe Weather Phenomena Incorporating Comments Provided in Util .Evaluation Will Provide Basic Input Into Integrated Safety Assessment

ML17258A292
Person / Time
Site:	Ginna
Issue date:	11/03/1981
From:	Crutchfield D Office of Nuclear Reactor Regulation
To:	Maier J ROCHESTER GAS & ELECTRIC CORP.
Shared Package
ML17258A293	List: ML17258A292
References
TASK-02-02.A, TASK-2-2.A, TASK-RR LSO5-81-057, LSO5-81-57, NUDOCS 8111050486
Download: ML17258A292 (8)

Text

Docket No. 50-244 LS05 05'9-

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"'~yjg5 Mr. John E. Maier Vice President Electric and Steam Production Rochester Gas 8 Electric Corporation 89 East Avenue Rochester, New York 14649

Subject:

SEP TOPIC II-2.A, SEVERE WEATHER PHENOMENA

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/i Enclosed fs our ffnal evaluation of SEP Topic II-2.A. "Severe Weather Phenomena" for the R.

E. Gfnna site.

This evaluation (Enclosure 1) incorporates those comments provided fn your letter dated January 19, 1981.

In accordance with your comments we have provided the appropriate references to our data.

In addition, you requested that we provide the references which were not available to you.

These are included as En-closures 2 and 3.

Your letter indicated a concern regarding the snow load provided in our original evaluation, We have reviewed your comments and have revised our estimated snow load as indicated fn the evaluation.

Finally. you stated that, on a reasonable design basis, tornado loadfngs for the Gtnna sfte need not be considered.

You further stated that you would evaluate the available data and provide the NRC with a reasonable design basis wind load.

Subsequent communications with your staff have indicated that you are not pursuing thfs matter.

Based on your concern, we have reevaluated our design basis tornado and have provided a revised design basis tornado as indicated fn our final evaluation.

r 81ii050486 8iil03 PDR ADOCK 05000244 P

PDR n~g'OMlI~ 4 This evaluation will be a basic input to the integrated safety assessment for your facflfty.

This assessment may be revised fn the future ff your facility design fs changed or ff the NRC criteria relating to this subject are modified before the integrated assessment fs complete.

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S Sincerely, IP (o~')

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Dennis M. Crutchf'feld, Chief gwo,:~~

Operating Reactors Branch No.

5 Division of Licensing OFFICE/

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Mr. John E. Maier CC Harry H. Voigt, Esquire

LeBoeuf, Lamb, Leiby and MacRae 1333 New Hampshire Avenue, N.

W.

Suite 1100 Washington, D. C.

20036 Mr. Michael'lade 12 Trailwood Circle Rochester, New York.14618 Ezra Bialik Assistant Attorney General Environmental Protection Bureau New York State Department of Law 2 World Trade Center New York, New York 10047 Jeffrey Cohen New York State Energy Office.

Swan Street Building Gore 1-, Second Floor Empire State Plaza

Albany, New York 12223 Director, Bureau of Nuclear Operations State of New York Energy Office

-Agency Building 2 Empire State Plaza

Albany, New York 12223 Rochester Public Library 115 South Avenue Rochester, New York 14604 Mr. Thomas B. Cochran Natural Resources Defense Council, Inc..

1725 I Street, N.

W.,

Suite 600 Washington, D. G.

20006 U. S. Environmental Protection Agency.

Region II Office ATTN:

E IS COORDINATOR 26 Federal Plaza New York, New York 10007 Herbert Grossman; Esq.,

Chairman Atomic Safety and Licensing Board U. S. Nuclear Regulatory Comnission Washington, D. C.

20555 Dr. Richard F. Cole Atomic,Safety and Licensing Board U. S. Nuclear Regulatory Commission Washington, D. G.

20555 Dr. Emmeth A. Luebke Atomic Safety and Licensing Board U. S. Nuclear Regulatory Commission Washington, D. C.

20555 Supervisor of the Town of Ontario 107 Ridge Road West

Ontario, New York 14519 Resident Inspector R. E. Ginna Plant c/o U. S.

NRC 1503 Lake Road

Ontario, New York 14519'

ENCLOSURE 1

Systematic Evaluation Program Meteorology R.

E. Ginna Nuclear Power Plant Topic II-2.A Severe Weather Phenomena

'xtreme meteorological conditions".and severe weather phenomena in the

'=.

Ginna site'.region-:were examined to determine if safety-related struc-, '

tures, systems, and components are. designed to function under.'.all,severe-Aeather conditions.

Discussed below are the.sever e weather phenoma

'which could. adversely affect. the. Ginna site and which should be examined relative to the current design.

Normal daily temperatures range from a minimum of 18 degrees Fahrenheit in January to a maximum of 82 degrees Fahrenheit in July. '

h1easured (1, 2, 3

extreme temperatures for the site region are 100 degrees Fahrenheit

'hich occurred in June 1953 and -16 degrees Fahrenheit which occurred in February 1961.

The extreme maximum.and minimum temperatures appropriate (4) at the Ginna site for general plant design (i.e.,

HVAC systems) are 91

.degrees Fahrenheit (equalled or exceeded lX of the time) and 2 degrees Fahrenheit (equalled or exceeded 995 of the time).'>>

"Thunderstorms occur an average of 29 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 kilometer.

A structure with the approximate dimensions of the Ginna reactor building can be expected to be subjected, on the average, to one strike every 10 years.

- The design wind speed (defined as the "fastest-mile" wind speed at a

I height of 30 feet above ground level with a return period of 100 years) acceptable for the site region is 85 miles per hour.

On the average, (4,5,6) hail storms occur about two days annually, and freezing rain occurs approx-imately 12 days per year.

The maximum radial thickness of ice expected in the site region is about 0.75 inch.

Mean annual snowfall in the site region is approximately 86 inches.

In (1 s)

.the site area, a maximum monthly snowfall occurred in February 1958 and totaled 72.6 inches.

The maximum snowfall from a single storm totaled (ig)

'43.5 i'nches in March 1900.

The maximum measured snow depth on the ground for the site region is 48 inches.

Highly localized effects operate to (7) produce snow falls in the Lake Ontario'"snow belt" along the south and east shor es of the lake.

A recent study (

) in the area has shown that snow loads for this section of the lake shore are about 40-50 lbs/ft 2

If we now add the 48 hours5.555556e-4 days <br />0.0133 hours <br />7.936508e-5 weeks <br />1.8264e-5 months <br /> probable maximum winter precipitation (

) 'o this 50 pound value a total of 100 lbs/ft would result.

The 100 lb/ft 2

(i 5) 2 combined snow load is suggested for st'ructural capability assessment at Ginna.

The 100 lb/ft should be generally applicable to the site although 2

local drifting on buildings could produce higher loads.

Based on. actual tornado occurrences in the site region area a "site-specific" design basis'ornado (with a probability of occurrence of 10 per year) cari be calculated..For the Ginna site, the characteristics S

of tornadoes oc'curring within a 60 mile radius are a maximum windspeed

'of 250 miles per hour

,a maximum pressure drop of 1.5 pounds per square

'22) inch,'nd a"rate of pressure drop of 0.6 pound per square inch per'econd.

'he'ornado

'wind 'speed provided is on the order of the upper 95'percentile

.value.

This. value is recommended for use in the SEP evaluations since it compensates for the uncertainties inherent in the analysis.

These uncer-tainties are described below..

..At the Gonna site, '.tornadoes/water spout's were not "considered qven =if '.they I

had been observed over the water, thereby lowering the number of tornadoes considered and possibly biasing the results.

This reduction of'onservatism due to counting tornadoes, un'certainties in the use of various factors for the DAPPLE probability analysis, and the fact that the'DAPPLE method.re-flects only. the wind speed at which a structure failed which may not be the maximum wind that occurred can lead to underestimates of wind at a given pro ba bi 1 ity 1 evel Finally, McDonald's (1980) analysis relies only on the detailed study (22) by Abbey and Fujita (1975) of the 1974 "Super Outbreak" of tornadoes during a two-day period.

The study has not been expanded to incorporate additional detailed review of subsequent tornadoes in other areas of the country.

As a result, the'eneral applicability of this type of analysis is unknown.'

4

'2.

3.

4.

5.

6.

7.

8.

References U.S. Department of Coimerce, NOAA, "Climates of the States,"

Vol. 1, 1974.

U.S. Department of Comerce, "Climatic Atlas of the United States,'ine 1968.

V U.S. Department of Comerce, NOAA, "Climates of the United States,"

1973.

U.S. Department of Comnerce, NOAA, "Local Climatological Data,"

Rochester,

Syracuse, and Buffalo, New York; 1976.

H. C. S.. Thorn, "New Distributions of Extreme Minds in the United States,".',

Journal of the Structural Division, ASCE, Vol. 94, No. ST7, July 1968.

"American National Standard Buildin'g Code Requirements for Miniaam Design Loads in Buildings and Other Structures,"

ANSI, A58-1-1972.-

I

. "Seasonal Variation of the Probable Maximum 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, Mashington, D. C., April 1956.

James A. Ruffner and Frank E. Baier, "The Meather Almanac," Gale Research Coo@any, 1974..

9.

David M. Ludlum, "Meather Record Book," Meatherwise, Inc., 1973.

10.

12.

J. L. Marshall, "Lightni'ng Protection,".

John Miley and Sons, New York, 1973.

"ASHRAE Handbook of Fundamentals,"

American Society of Heating, Refrigeration and Air Conditioning Engineers, Inc.,

New York 1976.

Paul Tattleman and Irving I. Gringorten, "Estimated Glaze.lce and Mind Loads at the Earth's Surface for the Contiguous United States,"

Air Force Cambridge Research Laboratories, October 1973.

'13'.S-Housing and Home Finance Agency, "Snow Load Studies,"

Housing Research Paper No. 19, May 1952.

14.

15.

U.S.

Naval Meather Service, "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

Engineering. Division of Technical

Review, NRR) dated March 24, 1975,

Subject:

Site Analysis Branch Position - Winter Precipitation Loads.,

r 16.

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.

17.

'1 8.

19.

20:

21.

Regulatory Guide 1.76, "Design Basis Tornado for Nuclear Power Plants,"

U.S; Nuclear Regulatory Coamissio'n, Washington,.D'C;.....

WASH-1300, "Technical Basis for Interim Regional Tornado Criteria,"

U.S. Atomic Energy-Comnission, May 1974.

Sterling Power Project - Nuclear Unit 1 {SNUPPS), Preliminary Safety, Analysis Report, Docket No. 50-485.

H. C. S.

Thorn, "Tornado Probabilities," Monthl Weather Review, October-December

1963, pp. 730-736.

Steyaert, L.T. el al, "Estimating Water Equivalent Snow Depth from Related Meteorological Variables" National Oceanic and Atmospheric Administration, NUREG/CR-1389, U. S. Nuclear Regulatory Commission, Washington D.C. May 1980.

22.~McDona1d, J.E.,

"Tornado and Straight Wind Hazard Probability at the=Ginna Nuclear Power Reactor Site New York," Institute for Disaster

Research, Texas Tech. University, Lubbock, TX, May 1980.