ML20236M771

From kanterella
Jump to navigation Jump to search
PG&E Meteorology Ofc Rept on Diablo Canyon Site,San Luis Obispo County
ML20236M771
Person / Time
Site: Diablo Canyon  Pacific Gas & Electric icon.png
Issue date: 09/29/1966
From: Hunsaker L
PACIFIC GAS & ELECTRIC CO.
To:
Shared Package
ML20236J368 List: ... further results
References
FOIA-87-214 NUDOCS 8708110222
Download: ML20236M771 (18)
v • d • e


Text

. . . . .. . .. . . .. .. .

)

1 l

l ,

l 'j t

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.

J

'(

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

j 1

i

{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.

i I

l The most significant indication from the accumulated information ]

1 l

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.

1 l

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

{

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

(

4-

n n e

i i o

- t t

_ a a t t i i

- n p p o

_ i i

_ i c c t e e O a v

r P

r P

r n

e , ,

o s e e i b r r t

- O u u a t t t

_ f a a i p

o r r e

p e

p i

e d c d d e n

- p m m n n y e e i r i i T T T W P W W 5 0 2 1 1 9 6 6 6 6 4 5 d 9 9 9 9 9 9 r

o o 1, 1, 1, 1, 1, 1, c T . . y . . y e n n l n c l R a a u a e u J J J J D J f

o d

o i 9 1 9 1 8 9 r 5 5 5 5 3 5 e 9 9 9 9 9 9 P m o 1, 1, 1, 1, 1, 1, r . . y . e .

X F b n l n n n E e a u a u a D F J J J J J N

I y

N l e O . . og . .

I t r Per r T . p u l u u A t p

e B el B B O T S

r e

v D e

D e

r e

t o aCr t e r

e r c h S h h e e i t t t s r l a l a a 1 b i o e a e e E

O F P W C W W L

B A

T n

o i )

- tt 5 0 7 0 8 8 ae 1 8 6 0 3 3 _

ve ef 1 3 3 2 2 l(

E t t r r o

p o

p o r r o p i i l s A A l i h e b a a c u O i i _

O y a

a e

g r s r

a r

a n B B A i M M o u _

i o o t L a a t r m n t t a r s i n n n t o i o a a S M P P S S U

.O o3

- . w oo Nl 01211 0 O0000 0

- nB a

e .

- es My a

_ D F

f0 o9

_ . e ov N o 00000 0 O1 001 1 b '

- nA

- a es

_ My a

D d

em n f

_ mu a o em 98490 2 60831 2 sm

_ ri 22223 3 34344 3 s t n xi n

o ro ar EM i ef t y A a h T

c 7 c A i ( a 2D em mu l e b yB E

R em ri u a 1 2028 0 96429 5 P Bo O EU LT t x xa 99888 9 89009 11 9

e os m

BA EM t ri AR a rP TE m o P i Mm M

rro l

E m C T u 1 9040 1 1 17373 8 8 of nm ai a f 73234 4 6 79222 0 9 i e en 44444 4 4 44555 5 4 n er Mi r ra M o a f s i . s r l t i e m

an sh u C e et 43305 1 1 58758 3 3 m h o nm ai 95145 5 6

. ye t 79881 9 1 ll nl ex 66666 6 6 66667 6 7 h p el .

Ma t p rA0 M nu a 6 os p 9 M .1 r n) e ma oe i so r dt

))))) ) ) ))))) ) ) ry sr u 00431 6 8 18277 7 9 f ro1 t . . . n ec5 na 63233 3 4 46899 7 0 ae b e9 ar 55555 5 5 55555 5 6 t t mr1 ee ((((( ( ( ((((( ( ( a u Mp 36778 6 0 38561 1 6 D N m . . .

e 84134 4 6 79002 0 0 T 55555 5 5 55666 6 6 . .

1 2 e

g e  :

g S a a E r r T e e O v v N A A O rr y n

o r n

o eeyr s e s a b a r bb ra e t m e e h mmauh S l s e S b t eeurc i eyut o n vcnb r t r ynl gp y t o oeaea e p auuue r c M NDJFM W A Ml -JAS D O

Q n o) i s td ar t o _

S c e -

eR r

if Fo .

ys -

ar B a e

oY r

l a 80454 6 2 55023 1 9 7 r7 t 38947 2 4 20002 1 5 8 r o( o . a _

M T 21131 2 1 3 e -

1 y n

e t .

- d n -

h a

c _

n _

y) ei ) _

l s s v 12332 2 00000 0 y od yo5 a -

Pr ab . B _

o DA0 oc o _

pe r sR h r i c o bf n M

(

Oo ei 24664 4 20001 1 A ss sv s T yo1 .

n A ir ab . . _

D ua DA0 o) _

Le ih _

3N O n Y t c aa

_G I a0 ce _

- f T S1 l iB EA ( a 24224 7 0 11120 7 2 1 l _

LT t 79713 5 6 51002 1 8 1 b o _

BI o . . . . um ps AP T 13443 3 1 1 _

TI 2 i _

C eP _

E t _

R ad -

mn P _

ia h l c cop _

n as

) ei s sv 13321 2 00000 0 ii d yo5 nb r ab rO o DA0 o

- h c f s ce ii aR l u e h aL -

_ Bf ec C o svn ya n _

o yoi ms sr ab 24664 3 10000 1 lS DA1 h(

t ia .

Pe 0 n0 Y o6 m91

- 0 1

(

l a 25950 8 2 44610 3 6 4 m-o1

_ t 8670,1 6 9 30002 1 4 4 r5 o . . f9 T 12332 2 1 6 1 1 d

_ et nn i e e

am

_ e g g t e

_ bl a a op r r p

- e e v

au v t s a

A A

_ ' ', n n D

o r o rr y s e s eeyr a b a r bb ra e t m e e h mmauh S l s e S b l a

t eeurc i eyut y

o n vcnb r t r ynl gp t t o oeaea e p auuue r c o M NDJFM R A MJJAS D O T jl !l

T W 84002 1 N 2 3 e N

W 47102 9 N 95 5 4 5 W 08008 6 N 31 4 1 W 81 9 57002 6 W 60 81 7

9 1

T R

O P

W S

78005 7 8 1

R I

W A .

A 38001 1 I W 8 9 R

A M

A T W 47001 -

N S 1 2 A1 S 4S4 9

- ,1 Y 77 004 2 ER0 S 62 9 D LA7 B

AM9 TU3 S9 E 84204 1 1 S 23 6 A S T

A D

E 14847 5 D S 36 0 N 2 3 I

W L E 02002 3 A S 0 0 U E 2 2 N

N A

32005 3 E 9 9 1 1 E 50005 -

N 2 2 E

E 37000 2 N 83 2 1

E 82202 1 N 22 5 N

83001 2 N 71 9

)

' 3

- t 0 n

( 7l e 4 a c d) m51 7 t r d eh l134 ro e nep a - = - eT P i pm C462 v WS( 1 3 o i

/

1 0

8 7

372613493.00 62 041 93101

. 7 4

1 2221 2

)

t n

e c

r e

P 0

('

e0 0

3981 07653.00 401 26931 01

. 4 4

c0 2221 2 n1 e

r u

AI c

c R O A

M f o

A y T

N c 9833591 0 7 A2 S6 n'0 e6 3400630001

. 0 0.0 3 1

9 u3 1 232 2 D1 q N e AYL F r

' l OU e 5LJ v L e

- ED l A EG LR9 U *I a

e BA5 45211 511 00 8 s A 9 ' . . . . 0 4 TT1 0 7337620001 5 n N 1231 2 a I Y e OR m PA U e

- N v A o SJ b D a E t E

P e S e f

D N n I i W s g

s n g i n d i a d e r r H e o t c a e  :

e R e r t d gl l o e a a N e dt t p) 284186 no o Sh 3711 2334 aT T

  • p - - - - - - - -

d m 04839 5297 i

n( 112334 W

G

i

,. l l N p  % o

/

[ N' of I

/  % .

i \

l 59 s

i W -

i E

/

\

/  :

l .

~

s S

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

N M

C .

s cKo

/

W >

E l,

i

/

S C ALM CONDITIONS (O-3 mph) EXISTED 33 */o OF THIS PERIOD WET SEASON (NOV-M AR.) 1938-1941 (n~. . -.

Ok

.- ~~

N p

o\0 ,

s s,

dP
w ---- E s

/

l

/

'~~_

s CALM CONDITIONS (0-3 mp(h) EXISTED 40 */o OF THIS PERIOD DRY SEASON

. __ _ _ _ MAY _ SEPT.)l938-1941 .______ _ -

_ _ _ _ _ ____m mm m

i l

C N i l

N 4

dP l I

' W .

E '

i

/

I(

s NOTES:

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

1

i I

!T I

i dP

'O W .

E l(

s NOTE:

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

( PT. ARGUELLO & SANTA MARIA >

N

( ,

W -

E l

i

~

i l 5 NOTE S '.

l 1. CALM CONDITIONS EXISTED 3 /o DURING THIS PERIOD

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

(

i i

II N

( .

. E l

be s-l W .

E  ;

l f

S l

l  !

l NOTE:

1. CALM CONDITIONS E XISTED 1,4 % DURING THIS PERIOD,  !
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.

I

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

]

PT ARGUELLO & SANTA MARIA l f l u_____..___________ . - . _

r l

l(

1 i

10 9

f 8

d. N ct 7 x N j

$0 /

.g o 5 ,

s 1500 PST y

/ ,

m 04 7 0300

~

2 O / PST N x

(. $$ y '/ '

N 2

i 0

l JAN. FEB. MAR. APR.MAY JUN. JUL AUG. SEP OCT. NOV DEC.

MONTHS OF YEAR l

FIGURE Z ANNUAL INVERSION BASE HEIGHT (POINT ARGUELLO)

C

o I

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

Diablo Canyon Nuclear Plant Site, Preliminary Geologic Investigations i

,k I

Retrieved from "https://kanterella.com/w/index.php?title=ML20236M771&oldid=3176170"