ML20198F138

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Forwards Meteorological Section for Inclusion in Des
ML20198F138
Person / Time
Site: Satsop
Issue date: 10/15/1974
From: Harold Denton
US ATOMIC ENERGY COMMISSION (AEC)
To: Muller D
US ATOMIC ENERGY COMMISSION (AEC)
References
CON-WNP-1239 NUDOCS 8605280422
Download: ML20198F138 (10)
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Text

', T Distribution:

L: Docket File L:RDG

  • L:SAB L:AD/SS OCT 1 a. 574 D. R. 11ulle r , Assistant Director for' Environmental Projects, L

,  !!EIE0ROLOGY f.ECTION FOR DRAFT ENVIRONf! ENTAL STATE TENT PLAziT siAttE : WPPSS Nuclear Power Project No. 3 - Units 3& 5 LICENSING STAGE: CP DOCKET dUllBER: 50-503/509

' RESP 0llSIBLE BRANCil: EP-4 REQUESTED C0liPLETION DATE : October 11, 197' REVIEW STATUS: Site Analysis liran ch (:eteorology) - complete Attached is the tieteorology Section for inclusion in the Draft duvironmental Statenent on the subject pl nt.

This section was prepared by J. Coll and R. .<o rn ac iauic z , Site Analysis 3 ranch, L.

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, lU. M.::.1 Harold R. ,enton, Assistant Director for Site Safety Directorate of Licensing Enclosure?

As stated cc: w/o enclosure A. Clarab us s o 11  !!cDon ald J. Panzarella

, cc: w/ enclosure S. Hanauer F. Schroeder

. SS Branch Chiefs A. Kenneke p ,,

W. Regan s

  • 4n J. Norris jY R. Kornasiewicz J. Coll R. 1;1ecker D. Eisenhut J. Carter 8605280422 741015 S. Varga PDR ADOCK 05000508 D PDR

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y O DRAFT ENVIRONMENTAL STATEMENT IN?UT WPPSS NUCLEAR PROJECT NO. 3 DOCKET NOS. 50-508/509 METEOROLOGY 2.6 METEOROLOGY 2.6.1 Regional Climatology Warm, generally dry summers and wet, mild winters characterise the clima :e of western Washington. During the fall and winter months, frequent maritime disturbances from the Pacific Ocean cause almost continual cloudiness and rainshowers nearly every day. (Table 2 . 6 -1) With spring,the semi-permanent Pacific anti-cyclone = oves northward..- Thus during the summer the period be-tween maritime disturbances has lengthened; and it is not unusual to experience 20 days without me as ur ab le rainfall.

6 The' nearness of the Pacific Ocean moderates the regional tempera-tures. Temperatures exceed 90 7 only about 5 days each year. Tem-paratures fall below 32 F about 80 days annually. But temperatures 1 '

below 0oF occur less than once every 10 to 20 years -'3 Precipitation averages vary throughout the area from 50 to 80 inches annually, depending on topography. The very frequent fall and winter rainshowers account for the majority of the precipitation. Snow occurs only periodically and usually does not accumulate signifi-cantly. 1 ? 3 On an annual basis, relative humidity averages S0 percent!

2.6.2 Local Meteorologv Ihe plant site is in an area of flat to rising topography.

The ridge on which the plant sits. rises about 370-ft.above the

V Chehalis and Satsop Rivers which meet one mile northwest of.

the plant site. The land continues to rise south and southeast of the site; and five miles to the south-southeast the eleva-tion above plant grade reaches 600-ft.3 Long-term weather records from Elma, Washington, about four miles northeast of the site, indicate that the average daily temperatures range between 450F and 31 F in January and between 76 F and 5007 in July. The extreme maximum tenperature recorded was 105 F and the extreme minimum was 00F. (Table 2.6-2)

Precipitation records from Elma indicate an annual anount of 65 inches. An average of 10.1 inches of precipitation makes

, December the wettest month, while only one inch-of rainfall makes

. Ju'ly tne driest. (Figure 2.6-2) The maximum 24 hour2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> rainfall recorded at Olympia, Washington, was 4.9 inches.1 Oakville, Wash-ington, about 13 miles s o u ?.he as t of the site, averages 7' inches of snow each year; however a 24-hour record :f 17 inches of. snow has fallen there. Heavy fog (visibility h mile or less) is fairly common; Olympia averages 92 days per year, of which 45 occur between September and December.

Windflow over the site region is mainly from the southwest quadrant. Fourteen percent of the wind comes frc= the most frequent direction of west-northwest. (Figure 2.6-2) 1

t 1.6.3 Severe Weather Lue to the moderating effacts of the Pacific Ocean and the ,_

regional topography, severe weather occurrences ars rare at the site. Olynpia averages only five thunderstorm.- each year.1 The area will average about one ice storm each year, and only 3

one severe ice storm (accumulation of one inch or more) every six or seven years. Hail greater than three-quarters of an inch in diameter is rarely observed'.5 Dursmg the period between 1955 and 1967, three tornadoes occurred within the one degree latitude-longitude square containing the site. This mean annual frequency of 0.23 tornadoes per year results in a recurrence interval of 5000 years for a tornado at the plant site. ,

9uring this same 13 year period, caly one windstorm with wind speeds of 50 knots (58 mph) or greater occurred near the plant site.5 High air pollution potential (air stagnation) c a:. be expected to occur on six days during the year.

6.1.2 Pre-operational onsite Meterological Pro 2ran A 60-mecer high meteorological tower, erected casite about 800 meters north-northeast of the proposed reactor site, became operational on May 1, 1973. Wind speed and direction are sea-sured at the 10 and 60 meter levels on the tower. The ambient air temperature and relative humidity are recorded at the 10 . meter

ly level. Vertical te=perature difference =easure=ents are made between the 10 and 60 meter levels. Precipitation is measured at ground level. The system conforms to the recommendations of Regulatory Guide 1.23 - Onsite Meteorological Programs. ~9' In evaluating the atmospheric dispersion conditions at the site,,

. the staff used the. joint frequency distributions of wind speed and direction by atmospheric stability class (based on the vertical temperature gradient), collected onsite during the period May 1973 through April 1974. The wind speed and direction measured at the 10 meter level and the vertical temperature difference between the 10 meter and 60 meter levels were the bases for the dispersion i estimates. The staff calculated estimates o f re l a t ive. atmospheric dispersion (X/Q) values at the various distances and directions from the site given in Section 5, using a Guassian diffusion model and assuming a ground level release with adjustments for building wake effects.

+

y TASLE 2.6-2 A'.'E:'ACZ MONIHLY AND ANNUAL CLOUD C0'.'ER, AND SKY CONDITION, AT OLY!iPIA, WAS!:I!X. TON Shy Cover Sky Condition Sunrise te Suns.

(Tenth of Cglestial Clear Month Do=e) (Days)b Partly Clgudy Cloudy (Eays) (Dain, January 8.6 2 4 25 February 8.3 2 5 21 lurch 8.1 3 6 22 April 7. 7 . 3 7 20 May 7.1 4 9 18 June 6.9 5 9 16 July 5.2 11 10 10 August 5.9 9 10 12 September 6.2 8 9 13 October 7.8 3 8 20 November 8.5 1 6 23 Decer.ber 8.9 1 4 26 Annual 7.4 52 87 226

'a - Period of Record 1945 - 1969 b - Period of Record 1942 - 1969 Notes:

Clear - O to 3 tenths sky cover Partly Cloudy _ -4 to 7 tenths shy cover

, Cloudy - 8 to 10 tenths sky cover

--. .y TABLE 2.6-2 110!."IHLY N;D AS!!L'AL !CA!; AI;D EXTPD2 TE! ?EP.ATURES AT E121A, WASHI!!CTO Average Daily Average Daily Monthly '

Record Record 21onth !!axt: un (F)"' ?!!nimum (F)"' Aversee (F)" !!aximum (F)  ?!ininun (F January 44.6 31.2 37.8 63 0 49.5 33.4 41.3 70 4 Feb ruary March 53.5 34.1 43.8 80 15 April 60.3 38.0 49.2 87 25 liay 67.4 42.7 55.1 95 25

.fune 71.3 46.7 59.0 103 35 July 76.2 49.7 63.0 105 37 August

  • 75.4 49.3 62.4 101 33 Septemb er 72.2 46.5 59.3 100 30 October 62.7 41.9 52.3 88 22

!?ovet-b er 52.6 36.2 44.5 74 5 December 47.7 34.5 41.1 65 10 Annual 61.1 40.4 50.7 10 5 0 a - Period of Record 1942 -'1960 b - Period of Record 1940 - 1965

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s References-Meteorology Sections (2.6 & 5.1.2) 1. U.S. Department of Com=erce, Environmental Data Service: 

   '                 Local Climatological Data, Annual Su= mary vich Compara-tive Data-Olympia, Washington. Published annually through: 1972.
2. U.S. Department of Commerce, Environmental Data Service:

Climatic Atlas of the United States. Environmental Science Services Administration, Washington, D.C., June 1968.

3. Washington Public Power Supply System: Environmental-Report - Construction Stage, Nuclear Project Number 3, AEC Docket Number 50-508/509 1974
4. Bennett, I., 1959:

Glaze, its Meteorology and Climatology, Geographical Distribution, and Economic Effects, U.S. Army Quartermaster Research & Engineering Center, Natick, Massa-chusetts

5. SELS Unit Staff, Natinnal Severe Stor=s Forecast Center, 1969: Severe Local Storm occurrences, 1955 - 1967.

ESSA Technical Memorandum WBTM FCST 12, Office of Meteoro-logical Operations, Silver Spring, Maryland. i

6. Thom, H.C.S., 1963: Tornado Probabilities, Monthly Weather Review, October - December 1963, pp 730-737.
7. Gross, E., 1970:

The National Air Pollution Potential Forecast Program, ESSA Technical Memorandum NSTM 47, National Meteorological Center, Washington, D.C.

8. Holzworth, G.C., 1972: Mixing Heights, Wind Speeds and Potential for Urhan Air Pollution Throughout the Conti-Suous United States. AP-101, Environmental Protection Agency, Office of Air Programs, Research Triangle Park, North Carolina. '
9. U.S. Atomic Energy Comnission, 1972: Rezulatory Guide 1.23 Onsite Meteorological Programs. USAEC Directorate of Regulatory Standards, Washington, D.C.
10. U.S. Atomic Energy Commission, 1973: Regulatery Guide 1.42, Interi: Licensing Policy On As Low As Practicable For Gase-ous Radioiodine Releases From Light-Water-Cooled Nuclear Power Reactors, Appendix B-Procedure for Calculation of Annual Average Relative Concentrations in Air. USAEC Directorate of Regulatory Standards, Iashington,
                             ,                                              D.C.
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