ML17174A646

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Forwards Safety Evaluation of SEP Topic II-2.A, Severe Weather Phenomena & Tx Tech Univ Rept, Tornado & Straight Wind Hazard Probability for Dresden Nuclear Power Reactor Site,Il
ML17174A646
Person / Time
Site: Dresden  
Issue date: 12/15/1980
From: Crutchfield D
Office of Nuclear Reactor Regulation
To: Abel J
COMMONWEALTH EDISON CO.
Shared Package
ML17174A647 List:
References
TASK-02-02.A, TASK-2-2.A, TASK-RR LSO5-80-12-014, LSO5-80-12-14, NUDOCS 8101070594
Download: ML17174A646 (7)
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Docket N.0-.~-l-O~ *

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~s_o-231 LSOS:-80:-12-014

  • Mr. J. S. Abe 1 Director of Nuclear Licensing Commonwealth Edison Company Post Office Box 767 Chicago; Illinois 60690

Dear Mr. Abel:

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SUBJECT:

DRESDEN 1 AND 2_ - SEP TOPIC II-2.A, SEVERE l~EATHER PHENOMENA

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  • The SEP review of Topic II-2.A, 11Severe Weather Phenomena 11 has been completed.

Enclosure l is the.staff's safety evaluation (SE) for.the Dresden 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*rexas Tech. report.*.Please infonn us if your as-built facilities differ*.

from the. licensing basis assumed in our assessment within 30 days of receipt.

of this lett~r~

  • * * **.-*.. You wi ~ 1 note that th: SE.id:nti fies. a design basis torryado: with. a ~robabi 1 i ty
  • of lo-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 importantto:safety.to determine their ability to withstand the.severe weather loadings *. The plants design parameters will then be colTipared 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.

Enclosure:

  • As. stated cc w/encl osure:,

See next page. * *

  • .Sincerely,
    • ~~f£~
  • Operating Reactors Branch #5 nivfsion of Licensing

.. 8101.0.70.~1

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Mr. J

  • s. Abel cc.***

Isham, Lincoln & Beale Counselors at Law

. One First National Plaza, 42nd Floor Chicago, Illinois 60603 Mr. B.* B. Stephenson*

Plant Superintendent Dresden Nuclear Power Station.

Rural Route fl Mo~ris, Illinois 60450 Natural Resources Defense Council

  • 917 15th Street, N. W *.

Washington, D. c.

20005 U. S. Nuclear Regulatory Con1nission.

  • Resident Inspectors Offite.
  • Dresden Station RR #1 Morris, Illinois 60450 Susari*N. Sekuler

. Assistant Attorney Genera 1.

  • Environmental Control Divis fon*

188 ~ *. Randolph Street Suite 2315 Chicago, 1llinois 60601 Morris Public Library 604 Liberty Street Morris, 111 i noi s

  • 60451

. Chai nnan

    • Board of Supervisors o~

. Grundy County Grundy County Courthouse

~o~~is~ Illinois* 60450

  • , John*F. Wolfe, Esquire.*

x 3409 Shepherd Street*.

  • *.*.Chevy Chase, Maryl and 20015 Dr. iinda w~ Little.
  • . \\

sob Henni tage DriVe *

  • Raleigh; North Carolin~ 27612 DRESDEN.NUCLEAR POWER STATION, UNIT NO. 2.

DOCKET NO.

50~237 i

Department of Public ~ea lth ATTN:

Chief, Division of Nuclear Safety 535 West. Jefferson*

Springfield, Illinois. 62761 Di rector, Technical Assessment.

Division Office of Radiation Programs (AW-459)

u. s *. Environmental Protection Agency Crystal Mall #2
  • ArH ngton,* _V frgi nia. 20460
u. s. Environmental Protection
  • Agency Federal Activities Branch Region V Office AHN: *EIS COORDINATOR 230 South Dearborn Street

. Chica~o,* Illinois 69604 I.,:

  • Or~ Forrest J. Remick 1
    • 305 East Hami 1 ton Avenue

. State College, Pennsylvania 16801

~* -

4..

  • . ENCLOSURE
  • 1
  • Systematic Evaluation Program Meteorofogy Dresden Units 1 and 2 Nuclear Power* Plant.* *
  • . Topic U-2.A Severe Weather* Phenomena Extreme meteorologi~al.conditions. and severe weather* phenomena.fn the.. **.

.

  • Dresden*s.ite region.,were examined to determine ff *safety-relatedstruc*.**

tures; systems,* and *:components ~re* designed to* ~unction ~nder al 1.severe *

.weather condftioris.

Discussed below are* the severe weather phenomena which could>adversely affect. the Dresden site and whieh should *be examined *.

(

  • . Normal daily* temp~ra.tures range.from a m1nimum' of 20_ degrees. Fahrenheit* *

. f*n.Jariuary to a: maxi.m1,1m of 86. degref!S* Fahrenheit fn July.

  • Measured ext~eme tem.peratures.for the site region are 113 d!!grees Fahrenheit which occurred* in July 1936 *and* "".27'degrees Fahrenheit which occurred ln.*..
  • .'January 1884 *. *.*The extreme maximum. and minimum temperaturesappropriate
  • . at the *Dresden site.for* ge,neral plant de.sign (f. e;. HVAc* systems) are 94~.Cfeg~eH Fahrenhef~ (equalled or. exceeded 1S "~'f the. time) and -5 degrees

.... ~

.Fahrenheit (equalled: or' exceeded:,9gl,of the time)~:

Thunderstorms occur. an average :of. 49 days per year in* the site region. **

.1

    • Based. on the ann~a 1 number of, thunderstorm day~, /the* c_a l cu fated. annua 1.. *.

. *.fhsh~ density. of gr~~nd,.lightnfog stri k_es i~ iive,flashes ~per* square-* * * *

~ "* *.

kilometer. A structure*with the approximate dimensions of the Dres*den reactor*

', building$ can be expected~: to be subjected, on the av.erage~, to one strike every.*

  • .** ftve. years.

The design wind speed (defined as the *.fastest-mi i'e** wind.speed at' a height of

30. feet abc>ve* :graund l evei* wfth* *a' retun1 period. of.* 100
  • ye~rs) acceptable for*.

the site* region is 82 mi] es per hour. *On: the average, hail stor115 occur about *

  • two days annually, and freezing rain occurs approximately 12 days per year.: The maxilllJm radial thickness ()f ice expectecj in the site regiQn is about one in.ch~

Mean annual snowfall in the ~ite.regionjs. ap.proximateJy.36.fnches, resulting in**.

a :~ormal winter precipitation snow load o'n a flat surface pf 'about 25 pounds per square f~ot~

T~e max~IJlUin monthly-snowfall. occurred iri,Janu'ary 1918, and totaled..

  • 42.5 inches, with a max1R1Jm.snowfa11 from* a single storm fotaling,18.0 inches i_n February)900~ The maxirrummeasured snow depth onthe ground for the site region *

. is 28 inches *. Based* on the.100-year.recurrence accugjlated ground snowpack~ and.

the:'48 h<lur probable maxirrum winter precipitation for the site region, the snow.

load on a flat s.urf~c~ ts: ~bout 95 ~ounds per. square foot. *.** *..

  • .. *...
  • Tor~adoes*. hav~ been ~eported: 233 *times **during the. period.. 1950-1977 with.in. in.***
    • appro~imate 60-mi le radius: from the'. Dresderi :s.ite, ~l;(clu~ing* the water area* over*

Lake'. Michigan~*. On the' average~ eight* tornadoes can*'be :expected to occur, Jn the~.**

  • vicinity. of the Dresden ~iteeveryyear.*. Based on.the path**length and width *

' data' fr~m tornadoes occurring in *the site r.'egi on, th'e recurrence *interval' for

'a tornad~ at the site is calcula:tecf.'to ~e about' 870 years.'.

.*.... 3_'

The assum?tions used in Regulato.ry Guide 1.76 ~rovide an adequate design basis

.. ~

tornado f()t.the site region~* These characteri sties include a maxi111.1m winds peed of 360 miles per hour (a maxiRIJm rotational windspeedof 290 miles per hour plu.s a maxirru~ tra~slationaf windspeed:of 70, Jt111esper,hour), a max1111Jni

  • .. 'pressure d~op 'of* three pounds' per square inch, andrate of' pressure drop of

<two pounds per *Sq~~ire inch per second~

Based on actual. tornado occurrences in the site area.(134' tornadoes with availa.ble data} and using ~he procedures discussed in WASH~l300, a*

11site-specific11 designbasis torn~do {with a probability of* O!=Currence* of 10..;7 per year) can be c~lculated~*

F~r the Dresden site, the characteristiCs of.

tornadoes oc~curring *within: a 60-mile radius. are i dent.i ca*1.to those _provided

    • in :Regulatory(iuide 1.76~ ** *

~*....

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~.

-References U.S. Department of Conmerce. NOAA, 11Climates of the States~" Vol~ 1,

.. 1974 *

. U.S~ Department of Conmerce, 11Climatic Atlas of the United States,"..

June 1968.

  • u.s. Department of Conmerce,. NOAA~

11Cl1mates of the United States,"

1973.*

U.S. Department of Conmerce~ NOAA:,

11Local Climatological Data,"

Peoria and.Chicago, Ill~nots, 1976.

H.* c. s. Thom, *New DHtributions of Extreme Winds in the United States,"

Journal of the St.ructur.al Division; :ASCE, Vol *. 94, No. ST7 ~ July 1968.

"American* National Standard Bui,lding Code Requfrements for *Minirum.

Design Loads in Buildings and Other Structures," ANSI, ASB.1-19.72.

  • .. "Seasonal Variation of the Probable Maxi rum Precipitation "East. of the lOSth Meridian for Area~ from 10 to 1,000 Square Miles and Durations of 6.~ 12~ 24~ and 48 Hours," Hydrometeorological Report No *. 33,.

Was.hington; D. C., Aprill956.

James A. Ruffn~r and Frank E. Baier, "The"Weather Almanac,.; Gale Research.Colll>any, 1974.

David *M. Ludlum, "Weather *Record Bciok~" Weatherwise, Inc., 1973 *.

J. L. Marshall,.. Lightni~g Protection,~ John Wiley and Sons, NeW York, 1973..

"ASHRAE Handbook of Fundamentals." American Society of Heating, Refrigerati.on and Air Conditioning Engineers, Inc~, New York 1976;

  • Paul Tattlem~ri and Irving L. Gringorten, "Estfmated Glaze Ice. and.
  • Wind.Loads at the Earth's su*rface for the Contiguous.United States, 11 Air Force Cambridge Research Laboratories, October l9l3~

U.S. Housing a~d Haine Fin.ance Agency, "Sno'tti Load Studies,*" :Housing

  • Research Paper No. 19; May 1952~.

u.s. NavaJ Weather Service, "Wcirld:.Wide Airfield Summaries," Vol.* VIII, United States *of Arrerica, Part 4, 1969.

Memo fro~. Harold R. Denton* (Assistant Director for Site Safety,* Division of Technical ~evieW~. NRR) to R. R~ Maccary. (Assistant D_irector for

~ '

Engineering, Division of Technical Review,.NRR) dated March 24, 1975, Subject*: Site Analysis Branch Position -

Winte~ Precipitation Loads.

Memo from Jerry Harbour (Chief*; Site Safety Research Branch,. Division of ReaC:tor-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 Freq.uency Data for SEP.

Review..

Reg.ilatory Guide 1.76,. "Design.Basis Tornado: for Nuclear Power Plants,*

.u.s. Nu.clear Regulatory Commission,. Washington,: D.C.

WASH-1300~ "Techni.cal Basis for Interim Regional Tornado Criteria,*

  • U.S. Atomic Energy Cortmission,.May 1974. *
  • H. c. s. Thom~ Tornado Probabilities*.;, Monthly-Weather Review,
  • october~D.ecember 1963, pp. 730~736.

. *' ~.

  • -: *,
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