ML20236M771

PG&E Meteorology Ofc Rept on Diablo Canyon Site,San Luis Obispo County

ML20236M771
Person / Time
Site:	Diablo Canyon
Issue date:	09/29/1966
From:	Hunsaker L PACIFIC GAS & ELECTRIC CO.
To:
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ML20236J368	List: IA-87-214, Discusses ACRS 92nd Meeting on 671207-09.ACRS Completed Review of PG&E Application for Const of Nuclear Unit at Diablo Canyon Site.Facility Can Be Constructed W/O Risk to Public Health & Safety ML20236J366 ML20236J587 ML20236J622 ML20236J671 ML20236J804 ML20236J841 ML20236J985 ML20236K008 ML20236K057 ML20236K327 ML20236K351 ML20236K384 ML20236K422 ML20236K563 ML20236L228 ML20236L279 ML20236L316 ML20236L364 ML20236L420 ML20236L474 ML20236L565 ML20236L647 ML20236L689 ML20236L706 ML20236L724 ML20236L756 ML20236L787 ML20236L806 ML20236L866 ML20236L901 ML20236L922 ML20236L931 ML20236L986 ML20236M007 ML20236M024 ML20236M065 ML20236M681 ML20236M725 ML20236M744 ML20236M771 ML20236M777 ML20236N015 ML20236N032 ML20236N085 ML20236N115 ML20236N139 ML20236N193 ML20236N208 ML20236N255 ... further results
References
FOIA-87-214 NUDOCS 8708110222
Download: ML20236M771 (18)

Text

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l DIABLO CANYON SITE i i

SAN LUIS OBISPO COUNTY l

! REPORT PREPARED BY TE METEOROLOGY OFFICE

( PACIFIC CAS AND ELECTRIC COMPANY I SEPTEMBER 29, 1966 l

1 i

APPROVED:

Y Leon M. Hunsaker Senior Meteorologist 8708110222 070729 PDR FOIA

! ; CONNOR87-214 PDR l

k A. Available Data The meteorological data present.ed in this report was obtained from locations nearest Diablo Canyon. Table 1 lists these locations and the type of information gathered in addition to the approximate period of record.

B. Temperatures Tabic 2 summarizes the temperature data from Pismo Beach and Morro Bay. The information shows a winter mean temperature of 540F. and a sununer mean of about 60 0F, Considering the extremes at these locations, the highest and lowest temperatures likely at the site would be near 102 0F, and l 260 F, respectively. About three days during the year, the temperature woald l

l be 900 F or higher, and about five days, 320F. or lower.

C. Precip_itation l

Annual precipitation along the coast near the site varied from 13.87 inches at Morro Bay to 21.11 inches 12 miles inland at San Luis Obispo, i l

! Thus, a reasonable estimate of annual precipitation at Diablo Canyon would 1 I

be about 15 to 17 inches. Slightly more than 80 percent of this amount would fall during the months November through March. Using the ten-year record of Pismo Beach as a guide, the annual rainfall has varied from a low of B.96 inches in 1953 to a high of 27.39 inches in 1958. The same figures for San Luis Obispo are 9.94 inches in 1953 to 29,34 inches in 1958. The average monthly rainfall in the " wet" season would range from about 1.7 to about 4.7 inches. Also, during the " wet" season, about 22 days would have 0.1 inch or more rainfall, and an additional 11 days would have 0.5 inch or more. A summary of the available precipitation data is provided in Table 2.

Snowfall at the site would be extremely rare. However, on the surrounding higher hilltops, a trace of snow may fall during the coldest winter storms.

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i D. Storms Stormy weather would occur mainly during the months November 1

1 through March, although a few storms either side of this period each year l l would not be unlikely, Storms during the winter season can be expected to produce about eleven days of precipitation greater than or equal to 0.50 inch in 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />. Only two days with precipitation of this magnitude would i

[ fall outside this season, Southeasterly winds will usually accompany storm I

activity and gusta equal to or in excess of 40 miles per hour can be expected l l

at times. I Winds of hurricane force would be extremely rare, i Thunderstorms, although infrequent, can be expected a few times a

, year including both winter and summer seasons.

l Small hail (one quarter inch or less in diameter) may fall a few I

.( times during the winter season accompanying the passage of colder, more vigorous storm systems.

E. Winds Santa Maria and Point Arguello are the only two locations near the site with reliable records of wind measurement. Six wind rose figures are attached showing the following:

Por Santa Maria (1938-1941)

Figure 1 - Annual Surface Windrose Figure 2 - Seasonal Surface Windroses For Santa Maria _and Point Arguello (1959-1962)

Figure 3 - Annual Surface Windrose Figure 4 - Annual 1000 MB Windrose Figure 5 - Annual 1000 ft, Windrose Figure 6 - Annual 950 MB Windrose Santa Maria's annual surface and seasonal wind roses are

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{f' based on several hourly observations per day taken during the period June 1938 to December 1941 Table 4 summarises this data on an annual basis. 1 Records from Santa Maria and P'oint Arguello were combined to l produce Figures 3 through 6 showing annual frequencies during the period  ;

January 1959 to July 1962. Data were obtained from observations twice daily, 4 a.m. and 4 p.m., PST._ The wind speed data is summarized in Table 5.

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l The most significant indication from the accumulated information ]

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j is the high frequency of northwesterly winds. At Santa Maria / Point Arguello, for example, the surface wind blows from the northwest quadrant 48.47. of the time annually.. In the winter season, however, southeast vinds are almost as frequent as northwest winds.

The wind speed is noted to increase to a point where it is inde-pendent of surface tonography. The annual average surface wind speed .as an

( example, at Santa Maria / Point Arguello is about 9 miles per hour, while at )

about 1800 feet it reaches nearly 15 miles per hour. The average elevation j of these two stations is about 300 feet above mean sea level.  !

Topography plays an important role in wind determination at any location. Hills in the vicinity of Diablo Canyon are expected to produce some channeling of the northwesterly flow. .At points of land that extend out towards the ocean, higher wind velocities than those at the' site can be expected.  ;

F. Stability ,

Stability at a given point is determined by the change of temperature in the vertical, or what ia commonly called the " lapse rate."

The subsiding or descending air associated with the Pacific Anticyclone produces a temperature inversion along the California coast. Under the CE inversion, the atmosphere is relatively unstable, while above, stable.

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A seasonal variation in the strength and height of this in- l

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version occurs due to the southward movement of the Pacific Anticyclone  !

in the winter (November to March) 'Almost coincident with this development, the Pacific storm track moves southward allowing stormy weather to enter I

the state. When storms occur, the inversion may disappear altogether. .On l

the other hand, the inversion is the strongest and most persistent in ,

summer (May to September) when the Pacific Anticyclone is nearest the West Coast.

Figure 7 shows the variation of the inversion's height at Santa Maria / Point Arguello each month at 0300 PST (Pacific Standard Time) and 1500 PST, in summer, when the inversion is strongest, the average heights are 370 meters at 0300 PST and 499 meters at 1500 PST, In' winter, the average heights are 271 meters at 0300 PST and 679 meters at 1500 PST, l

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NOTES:

1. C ALM CONDITIONSC 0-3 mph) RECORDED 37 % OF THIS PERIOD

2. PERIOD OF RECORD JUNE 1938-DEC.1941. -

3. B ASED ON SEVERAL OBSERVATIONS PER DAY

(l FJgure 1. ANNUAL SURFACE WINDROSE SANTA MARIA

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1. CALM CONDITIONS C O. mph ) EXISTED 13 */o OF THIS PERIOD l 2. PERIOD OF RECORD JAN.I.1959 JUNE 30.1962

3. BASED ON TWO OBSERWTIONS PER DAY fLgure 3. ANNUAL SURFACE WINDROSE oI ARGUELLO & SANTA MARIA C

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1. CALM CONDITIONS EXISTED 8 */o OF THIS PERIOD

2. PERIOD OF RECORD FROM JAN.t.1959 TO JUNE 30 1962 3.TWO OBSERVATIONS PER DAY TAKEN AT 4 AM. AND 4 pg, p,s,y, figure'4. ANNUAL 1000 MB C5FOft) WINDROSE

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2. PERIOD OF RECORDS JAN.l.1959 TO JUNE 30 1962.

3. TWO OBSERVATIONS PER DAY TAKEN AT 4 AM. AND 4 PM. P.S.T.

F_igure 5. ANNUAL IOOO.ft. WINDROSE PT. ARGUFI LO A SANTA MAQlA

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2. PERIOD OF RECORDS JAN.I.19 59 TO JUNE 50s l962

3. TWO OBSERVATIONS PER DAY TAKEN AT 4 AM. AND 4 PM. R S.T.

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_ Figure 6_. ANNUAL 950MB (1780ft.) WINDROSE

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APPENDIX 3 -- Pacific Gas and Electric Company Department of Engineering Research Report No. 5326-65:

Diablo Canyon Nuclear Plant Site, Preliminary Geologic Investigations i

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