ML17258A723

Forwards Safety Evaluation of SEP Topic II-2.A, Severe Weather Phenomena & Tx Tech Univ Rept, Tornado & Straight Wind Hazard Probability for Ginna (Brookwood) Nuclear Power Reactor Site,Ny

ML17258A723
Person / Time
Site:	Ginna
Issue date:	12/15/1980
From:	Crutchfield D, Crutchfield D Office of Nuclear Reactor Regulation
To:	White L ROCHESTER GAS & ELECTRIC CORP.
Shared Package
ML17258A724	List: ML17258A723 ML17258A725
References
TASK-02-02.A, TASK-2-2.A, TASK-RR LSO5-80-12-016, LSO5-80-12-16, NUDOCS 8101270150
Download: ML17258A723 (13)

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DFr. 15 1980 DISTRIBUTION:

Docket JWetmore NRC PDR

--RDiggs Local PDR JRoe TERA DEi'senhut NRR Reading

- RPurple SEPB Reading TNovak WRussell R'jedesc~

Hr. Leon D. White, Jr.

DCrutchfield

'g>ainas c Vice President HSmith Gcwal in@

Rochester Gas 5 Electric Corporation RSnaider

<CBerlinger 89 East Avenue TJCarter P~ Fi 1 e~

Rochester, New York 14649 OELD OI8E (3)

Dear Hr. White:

ACRS (16)

NSIC, JBuchanan

SUBJECT:

GINNA - SEP TOPIC II-2.A, SEVERE WEATHER PHENOMENA Docket No. 50-244

~ gQ g ~~ ~/P CI+

The SEP review of Topic II-2.A, "Severe Weather Phenomena" has been completed.

Enclosure 1 is the staff's safety evaluation (SE) for the site.

The review was done in conformance with Standard Review Plan 2.3.1 and covers extreme temperatures, lightning atrikes, 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 Teel1. report.

Please inform us if your as-built facility differs from the lieensinf basis assumed in our assessment within 30 days of receipt of this letter.

Sincerely, gyisinal Bi~~ed, by>a You wigl 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.

Enclosures:

As stated Dennis M. Crutchfield, Chief Operating Reactors Branch 5'5 Division of Licensing cc w/enclosures:

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Docket No. 50-244 LS05-80-12-016 UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON, D. C. Z0555 DEC L 5 198P Hr. Leon D. White, Jr.

Vice President Rochester Gas 8 Electric Corporation 89 East Avenue Rochester, New York 14649

SUBJECT:

GINNA - SEP TOPIC II-Z.A, SEVERE WEATHER PHENOMENA

'he SEP review of Topic II-2.A, "Severe Weather Phenomena" has been completed.

Enclosure 1 is the staff's safety evaluation (SE) for the-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 wijl 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, EncIosures:

As stated ennis M. Crutchfield, hief Operating Reactors Branch 45 Division of Licensing cc w/enclosures:

See next page

I

,I I

f)l

Mr. Leon D. Mhite, Jr.

R.

E.

GINNA NUCLEAR POWER PLANT DOCKET NO. 50-244 CC'arry H. Voigt, Esquire

LeBoeuf, Lamb, Leiby and MacRae 1333 New Has@shire

Avenue, N.

M.

Suite 1100 Mashington, D.

C.

20036 Mr. Michael Slade 12 Trailwood Circle Rochester, New York 14618 Rochester Committee for Sci ent ifi c Informat i on Robert E. Lee, Ph.D.

P. 0. Box 5236 River Campus Station Rochester, New York 14627 Jeffrey Cohen New York State Energy Office Swan Street Building Core 1,

Second Floor Eapire State Plaza

Albany, New York 12223 Director, Techni cal Development Programs State of New York Energy Office Agency Building 2 Eapire State Plaza

Albany, New York 12223 Rochester Public Library 115 South Avenue Rochester, New York 14604 Supervisor of the Town of Ontari o 107 Ridge Road Mest

Ontario, New York 14519 Resident Inspector R. E. Ginna Plant

.c/o U. S.

NRC 1503 Lake Road

Ontario, New York 14519 Director, Technical Assessment Division Office of Radiation Programs (AW-459)

U. S.

Environmental Protection Agency Crystal Mall f2 Ar lington, Virginia 20460 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 Comnission Mashington, D. C.

20555 Dr.

Emmeth A. Luebke Atomi c Safety and Licensing Board

'U. S. Nuclear Regulatory Coawrission Washington, D. C.

20555 Mr. Thomas B. Cochran Natural Resources Defense Council, Inc.

1725 I Street, N.

W.

Suite 600 Mashington, D. C.

20006 Ezra I. Bialik

.Assistant Attorney General Environmental Protection Bureau New York State Department of'aw 2 World Trade Center New York, New York 10047

ENCLOSURE l Systematic Evaluation Program Meteorology R.

E; Ginna Nuclear Power Plant Topic II-2.A Severe Weather Phenomena Extreme 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 tinder all severe

'eather conditions.

Discussed below are the severe weather phenomena 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.

Measured extreme temperatures for the site region are 100 degrees Fahrenheit which occurred in June 1953 and -16 degrees Fahrenheit which occurred in February 1961.

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

HVAC systems) are 91 degrees Fahrenheit (equalled or exceeded IX of'he time) and 2 degrees Fahrenheit (equalled or exceeded 99K 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 strNes 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 height of 30 f et above ground level with a return period of 100 years) acceptable for the si te

~ egion is 85 miles per hour.

On the average, hail stor~s occur about two days annually, and freezing rain occurs approximately 12 days per year.

The maxi-vvm radial thickness of ice expected in the site region is about 0.75 inch, i~lean annual snowfall in the site region is approximately 86 inches.

The normal winter precipitation snow'load on a f1at surface is about 90 pounds per square foot.

In the site area~ a maximum monthly snowfall occurred in February 1953 and totaled 72.6 inches.

.The maximum snowfall from a single storm totaled 43.5 inches in i<arch 1900.

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

Based on the 100-year recurrence accumulated ground snowpack and the 48 hour5.555556e-4 days <br />0.0133 hours <br />7.936508e-5 weeks <br />1.8264e-5 months <br /> probable maximum winter precipitation for the region, ihe snow load on a flat surface is about 150 pounds per square foot.

Tornadoes have been reported 15 times during the period 1950-1977 within an approximate 60-mile radius from the Ginna site, excluding the water area over l.ake Ontario and the land area in Canada.

On the average, one tornado can be

.xpected to occur in the vicinity of the

0 II h

Ginna site every two years.

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 11,500 years.

The assumptions used in Regulatory Guide 1.76 provide an adequate design basis tornado for the site region.

These characteristics include a maxioam windspeed of 360 miles per hour with a maximum rotational windspeed of 290 miles per hour and 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 and using the procedures discussed in WASH-1300, a "site-specific" design basis tornado

-7 (with a probability of occurrence of 10 per year) can be calculated.

For the Ginna site, the characteristics of tornadoes occurring within a 60-mile radius are a maximum windspeed of 285 miles per hour (a maximm rotational windspeed of 225 miles per hour plus a maximm translational windspeed of 60 miles per hour),

a maximum 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 infrequent occurrence of tornadoes in the site region (only 10 tornadoes in 28 years had sufficient data for calculations),

the site-specific tornado characteristics are based on a very small sample of data which we believe does not provide a reasonable degree of accuracy for calculations of safety-related structure design.

I.

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

Vol. 1, 1974.

U.S. Department of Cooeerce, "Climatic Atlas of the United States,"

June 1968.

U.S. Department of Cooaerce, 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 Winds in the United States,"

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

"American National Standard Building Code Requirements for Minimm Design Loads in Buildings and Other Structures,"

ANSI, A58.1-1972.

"Seasonal Variation of the Probable Maxirwm 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.

James A. Ruffner and Frank E. Baier, "The Weather Almanac," Gale Research

Corrpany, 1974.

David M. Ludlum, "Weather Record Book," Weatherwise, 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 Engineers, 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 Laboratories, October 1973.

U.S. Housing and Home Finance Agency, "Snow Load Studies,"

Housing Research Paper No. 19, May 1952.

U.S. Naval Weather 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.'accary (Assistant Director for Engineering, Division of Technical

Review, NRR) dated March 24, 1975,

Subject:

Site Analysis Branch Position - Winter Precipitation Loads.,

f 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 Revi ew.

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 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.