ML19308E056

SER Input from Site Analysis Branch.Util Onsite Meteorological Measurements Program Requires Evaluation. FSAR Data Acceptable

ML19308E056
Person / Time
Site:	Crystal River
Issue date:	01/15/1974
From:	Fairobent J, Markee E US ATOMIC ENERGY COMMISSION (AEC)
To:
Shared Package
ML19308E052	List: ML19308E051 ML19308E056
References
NUDOCS 8003200788
Download: ML19308E056 (9)

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CRYST AL. RIVER UNIT. 3 NUCLEAR' GENERATING PLANT' e-f DOCKET.NUM3ER.50-302 SAFETY EVALUATION REPORT-INPUT.

I 2.3 METEOROLOGY

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_Ry ional Climatologv l

The climate alcn; the central Gulf Coas t of. Florida is characterized:by varm, wet summers cont ras ted.b y.

relatively cccler, drier winters.

The Gulf of Mexico has'a coderating influence'on temperaturas and increases

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the humidity in the site area.

Local circulation is modified by the Gulf with the establishment of-the diurnal land-saa breeze regime.

The area is ' gene rally well south of p ri=ary e 7 tr.ces, although lows formed over the Gulf during the Fall occasions'.ly track n o r th-eastward thr:czh :he araa.

Tropic al' s t a r.ha and hurricanes I

r are not unce :en in the area, and cake landfall in the vicinity of :he site ab ou t once every'S and 12 ye ars,

f-i respectively.

'In :he perios 193'6-1965 there were about 46 cases of at:cspheric stagnation episodes las ting 4. days or more at Ta=ps, and 5 cases lasting 7 days or more.

p l-Atmospheric dispe rsion-conditions are expected to be better than :he a te r a;; a for all sites in the. United S t a t e s.

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l 2. 3.' 2 ' Local'M:tacralogy The Crystal River site.is ab o,n t 65 miles north o f Tanpa, 7/F 1

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. - in an area;where the topography varies by-only - 20 feet

- within 5 miles ~of the plant.

Temperatures may be expected'to reach 90 F or higher 75~ days per year, while te=pera:ures of 32 F or below nay be expected on about 4 days annually.

Monthly e n temperatures at Tampa range f rom 61 F in January to 82 F in August.

Fifty to sixty inches of precipitation can be expected each year, with ab ou t 50% occurring during the months of June through August, mainly as a_ result of thunder-storms.

Thase 3 months account for 56 of the 87 thunderstors days expected annually.

Snow is negligible. In the period 1871-1971, 52 tropical storms and hurricanes passed within 50 miles of the si te.

c rimaril[ssociated rich tropiaal scorcs Tornadoes are 7-and hurricanes.

In the period 1955-1967, 33 tornadoes rere reporred within the one. degree latitude-longitude sq: sre containing the site, giving a mean annual frequency of 2.5 and a :omputed recurrence interval of 580 years at the site.

Also for the period 1955-1967, there were 26-reports of' hail 3/4 inch or greater, and 31 reports of

- vindstoras-50 knots or greater in the one degree las ttude-longitude square ce ntaining the s'i t e.

The " fastest mile" of windRreported.at Tampa was 84 mph in S ep te=b e r 19 35.

The ' red 'ainant vind flow in the' area.is from the northeast through east.

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2. 3. 3" Onsite Meteorological Measurements Program

.The current onsite meteorological measurements program consists of measure =ents from a 150-ft tower, located feet about 1600'/

west of the nearest building, Unit 2,

which is the highest building onsite at about 190 feet.

Current instr =entation on the tower does not meet the recommendacions of Regulatory Guide

1. 2 3, and consis ts i

only of Bendin Medal 120 aerovanes (nominal starting I

speed of 2 mph) measuring wind speed and direction at f

the 35-ft and 130-ft levels.

Data have been recorded l

at both levels since 1970, however, data recovery did not meet the recommended 90>. until 1972.

The applicant h2s submitted cne year of onsite data (January 1, 1972 -

De 2=ber 31, 1972) with data recovery of about 97% at both levels.

These data were submitted as joint frequency distributions of wind speed and direction by at=ospheri: s t ab ility, with stability classifications derived frac the standard deviation of horizontal wind fluctuation (sigma-theta) instead of vertical temperature gradient.

The expected a'ccident and annual average dispersion conditions for the plant site have been evaluated using the wind and stability data from the 150-ft level for 1972, with the wind speed reduced to 33-ft by use of the power' law f or wind profiles.

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staffL eels that sigma-theta measdrements.f rom 150-f t f

are moris. conservative than the-35-ft =easurements.

The a7plicant has'co==itted'(by letter' dated October-19,_

1973, and received October 23, 1973) that a new.

- meteorological seasurements p rogra= will be installed, of consis ting /a wind speed and direction sensors _ct the two levels, a=bient temperature at two levels, and dif f aren tial tsaparature becueen two levels, commensurate with.the reconsendations of Regulatory Guide 1.23.

In addition, this information will be displayed in the Crys t al Rive r Unit 3 control room.

Evaluation will be made when the pr: gram is formally submitted to the staff.

2.3.4 Shor -:ers (Accident) Diffusien Estimates In the evalu_ti a of short-term (0-2 hours at the exclusion dis:ance and 0-8 hours at the LPZ distance) accidental releases from the buildings and vents, a ground-level release with a building wake factor, cA, of 925 m was assumed.

The relative concastration (X/Q) for the 0-2 hour time period for onshore flow conditions which is exceeded 5% of the time was calculated, using_

the nodel described in Regulatory Guide 1.4, to be 4

2. ; x10 sec/=3 at the exclusion dis tance of 1340m from the reactor.

This relative concentration is equivalent to dispersionLeonditions. produced by pasquill F stability a

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. with a windispeed of 1.3 neters/second.

The relative co 2cen tration - for the < 0-8 hour ti.me perio'd.fo r onshore flow conditions'at the outer boundary of the low

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population one (8047m from the' reactor) was es timated -

tobe 1.0x10-5 sec/m The estimated rela tive con-3 centration at the LPZ for' the 8-24 hour time period

-6 was 6.8x10 sec/m ; for the 1-4 day period was

~0 2.75::10 sec/m ; and for the 4-30 day time period was 7.5x10-sec/m The relative concentration estimates of the applicant are within a factor of two of the values calculated by the s taf f.

These differences can be attrib ute d to use of data from tha 35-ft level and use of all dire c tions in the ana'yses, t

f 2.3.5 Lan;-Tern (Routine) Diffusion Estimates The highes: overland offsite annual average relative

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concentration value of 1.5x10 sec/n for vent releases 2i 3

occurred at the-site boundary (1450m) e as t-no r t h e as t of I

the reactor structures.

This value is about a factor 4

of two more conservative than l calculated by the j

applicant.

This difference can be attributed to the E

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3 use of only onshore winds from the 35-ft level f or the annual ~~ average calculations perf or=ed by the applicant.

2.3,6 Con:lusicas The sr.aff concludes that the data presented in the FSAR for the period January 1, 1972-December 31, 1972, are

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the best available from the Crystal River site at this time.

The instru=entation used f or the wind speed and direction seasurements, and the use o# the standard-deviation of horizontal wind fluctuations for classifying s:abili:y ccaditions, are not consen s u r a t e wita the recommendations of Regulatory Guide 1.23.

The applicant Era cr==itted to establishing an onsite meteorological ceasurements progra= in accordance with Regulatory Guide 1.23,"and to display appropriate r

i parameters in the control room.

The s taf f should evaluate this program before it becomes operational.

The applican: should also commit to provide at least one representative year of onsite data (with data recovery of at least 90%) from the new progran to allow the staff to verify the atmospheric dispersion conditions.

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Sibitography - Meteorology Section s

Climatology of Atlantic'TropicEl'

~ Alaka, M.A._,

1968:

S to rms and Eurricanes.

ESS A Technical-Report,

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UB-6,l Techniques Development Laboratory, Silver Spring, Mary 12 >

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Cry, G.U.,

1965:

Tropical. Cyclones.of the North-Atlantic Ocean.

Technical' Pap er.No. 55,.U.S.

Departuent of Commerce, Weather Bureau, Washington, D.C.

The National Air Pollution Potential-i

Gross, E.,

1970:

ESSA Technical Memorandum ULTM Forecast Progran.

NZO 47, Mational Me teorological Center, ~ Uashington, l

D.C.

4" l

H olzuo r th, ' G.C., 1972: ' Mixing Heights, Wind Speeds, and the Potencial f or Urban Air Pollution Throughout Contiguous L'aiced States.

AP-101, Environmental l

Protection Agency, Office of Air Programs, Research 2

Triangle ? ark, North Carolina.

American

Euschke, R.E.,

1959:

Glossary of Me'teorology..

Me teorological Society, Bos ton, Massachuset ts.

Climat logy of Stagnating' Anticyclones Korshover, J.,

1957:.

East of the.b chy Mountain, 1936-1965. -Public b alth Service P ublication -No. 999-AP-34, Cincinnati, Ohio.

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List, R..T. (e d. ),.19 71:

-S=ithsonian Me teorological Tables.

Snithsonian Institution, Washington,-D.C.

- Heteor$1ogical Memorandum EUR. 7-97,.1968$

Interim Report Ch arac t e ri;: tic s of the Prob able Maximun Hurricatie,-

Atlantic cal Gulf Coasts of the United States.

From the Hydroneteorol:;ical 3 ranch, Office of Hydrology, U.S.

Ucather Bureau to the Corps of Engineers.

Menorandum EUR 7-97A, 1963:

Asymptotic and Peripheral From the Pressu cs f or 2 robable Maximum Hurricanes.

Hydrometeorciogical Branch, Office of Hydrology, U.S.

Ucather Bureau to the Corps of Engineers.

Pasqu'ill,.F :nd S=ith, F.B.,

1970:

The Physic'al and Meteorologicil Basis for the Es timation of. Disp ersion.

Pa'per presented at the Second International Clean Air Congress of the International Union of Air Pollution Prevention Associations,'.Udshington, D.C.

SELS Unit Staff,'.iational Severe Storas Focacast Center, 1969:

Severe Local Storm occurrences,. 1955-1967.

ESSA Technical lierc randun W3 Tit FCST.12, Offica of Meteorological Operations, Silver Spring, Marf land.

Simpson, R.I. and Lawrence, M.E.,

1971:

Atlantic Hurricane Frequencies Along~the U.S.

Coastline.

I!OAA Te chnical Menorandun ::US S2--58, Southern Region, 17ational Ucather Service, 7 rt Uc r th, T e:-:as.

,a

Slade, D. H. (e d. ), 1968:

Heteorology and Atomic Energy-1968.

TID-24190, I!ational Technical Information Service, Springfield, Virginia.

Thom, H.C.S.,

1963:

Tornado P rob ab ilit ies.

Mon thly Ucather Ravie, October-December.1963, pp 730-737.

Thom, E.C.S.,

196E:

cu Distributions of Pxtre:-c Uinds in.th9. United 3:ntes.

Journal of the Structural n

Civil

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. Division, P;eceedings of the Ancricat: Society July 1968, pp,1787-1501.

Pngineers 1*

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T u rn e r,- D. B.,.,19 7 0 :

Workb'ook of-Atmospheric Dispersion Esticates.

Public Health Service Publication No.

9 9 9-AP-26,. Cincinna ti',,0 h i o..

U.S.. Atonic-Energy'Cn==ission, 1973:

Regulatory Guide-1.4',-Assu=pti:ns Used for Evaluating the Potential

'Radiologica' C:nsequences of a Loss of Coolant,

- Acciden t1f or Pressurized Water Reactors-Revision.1.

USAEC, Ditectorate of Regulatory Standards, Washitigtoa, D.C.

U.S.. Atomic Energy Commission,.1972:

Regulatory -Cuide 1.23, Onsite Mateorological Programs.. USAEC Directorate-of Regulato y S:andards, Washington, D.C.

U. S '. Atomic Enargy Commission, 1973:

' Regulatory Guide 1.42, interi: Licensing Policy On As-Lew 'As P rac ticab le For Caseous Radiciodine-Releases From Light-tTa ter-Cooled Iluelear Power Reac tors.

USAEC Directorate of Regulatory Standards, Washington, D.C.

U.S.

Department of Concerca, Environmental Data Service:

Local Cli=atological Data, Annual Su==ary'ulth Comparative nata - Tampa, Ylorida.

Published annually through 19 72.

The. Computer progran used.to calculate the X/Q values may be referenced as follows:

Nuclear Power S tation Evaluation Progran (in FORTRA:' code), J.

R.

Sagendorf, ARL/NOAA

.progran=er.

Progran available at the USAEC, Dixectorate of-Licensing, Bethesda, !!d., or at the-Air Resou cos-Laboratory, 50AA,' Field Research Offica, Idaho Falls, Idaho.

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