N US- 1644

REPRESENTATIVENESS OF THE DAVIS-BESSE METEOROLOGICALDATA FOR THE PERIOD AUGUST 4,1974 THRO UGH AUGUST 3,1975

WITH RESPECT TO LONG-TERM METEOROLOGICAL CONDITIONS

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THE ATTACHED FILES ARE OFFICI AL RECORDS - ,

OF THE OFFICE OF REGULATION. THEY HAVE'

t.BEEN CHARGED TO YOU FOR A LIMITED,ilMEPERIOD ANS MUST BE RETURNED TO THE- @p #

CENTRAL RECORDS STATION 008. ANY RdGE(SFREMOVED FOR REPRODUCTION MUST BE' RETURNEDTO ITS/THEIR ORIGINAL ORDER. N

E DEADLINE RETURN DATE Eo- 6 30 oF Sn,w *- n9s g ,

O oE rn

} MARY JINKS, CHIEF

8002060 CENTRAL RECORDS STATION

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NUS-1644;

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REPRESENTATIVENESS OF THE DAVIS-BESSE METEOROLOGICAL i

DATA FOR THE PERIOD AUGUST 4,1974 THROUGH AUGUST 3,1975WITH RESPECT TO LONG-TERM METEOROLOGICAL CONDITIONS

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Prepared For .

THE TOLEDO EDISON COMPANY .

February 1976

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Environmental Safegnerds Division

NUS Corporation4 Research Place

Rockville, Maryland 20850 .

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'Approved: #- - Approved:' ''''C /

Achn H.'Tayloi, hMager < n J6seph J. DiNunno,

Meteorological Programs Vice President & General ManagerEnvironmental Safeguards Division

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TABLE OF CONTENTS

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Section Pacef

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I Introduction 1

''II Wind Direction and Speed 2

III Wind Direction Persistence 4

IV Atmospheric Stability 5.

V Summary and Conclusions 7

References 8

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LIST OF TABLES.

Table Title Pace~

l Average Wind Speeds for the Davis-Besse 9Site, the Toledo Express Airport, and the

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Fermi Site

2 One-Sector (22.5-Degree) Wind Direction 10Persistence Probability for the Davis-BesseSite (August 4,1974-August 3,1975) andToledo Express Airport (January 1,1960--

December 31, 1964)

3 Maximum One-Sector (22.5-Degree) Wind 11Direction Persistence for the Davis-BesseSite (August 4,1974-August 3,1975),

4 Maximum One-Sector (22.5-Degree) Wind 12Direction Persistence for Toledo ExpressAirport (January 1,1960-December 31, 1964)

'5 Annual AT Stability Distribution Comparisons 13

for the Davis-Besse and the Perry Sites

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LIST OF FIGURES

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Floure . Title

1 Davis-Besse site monthly wind distributionsat the 35-ft level: August, September, Octoberand November 1974

2 Davis-Besse site monthly wind di.2tributions atthe 35-ft level: December 1974, January, February,and March 1975

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3 - Davis-Besse site monthly wind distributions at the.

35-ft level: April, May, June, and July 1975

4 Davis-Besse site seasonal wind distributions atthe 35-ft level: spring, sumrrer, fall, and,

winter

5 Davis-Besse site annual wind distributions at the35-h level, August 4,1974-August 3,1975

'6 Davis-Besse site monthly wind distributions at the

250-ft level: August, September, October, andNovember 1974

7 Davis-Besse site monthly wind distributions at the250-ft level: December 1974, January, February,and March 1975

8 Davis-Besse site monthly wird distributions at the250-ft level: April, May, June, and July 1975

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9 Davis-Resse site seasonal wind distributions at the250-ft level: spring, summer, fall, and winter

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10 Davis-Besse site annual wind distributions at the250-ft level, August 4,1974-August 3,1975.-

11 Toledo Express Airport monthly wind distributions:August, September, October, and November 1974

12 Toledo Express Airport monthly wind distributions:December 1974, January, February, and March 1975

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LIST OF FIGURES (Continued)

figurg.

Titig13 Toledo Express Airport monthly wind distributions:

April, May, June, and July 1975

14 Toledo Express Airport seasonal wind distributions:spring, summer, fall, and winter

15 Toledo Express Airport annual wind distributions,'

August 4,1974-August 3,1975

16 Toiedo Express Airport seasonal wind distributions,January 1,1960-December 31, 1969

'17 Toledo Express Airport annual wind distributions,

January 1,1960-December 31, 1969

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I. INTRODUCTION,

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The purpose of this report is to show the representativeness of the meteoro-

logical data collected at the site of the Davis-Besse Nuclear Power Station

during the 1-yr period August 4,1974, through August 3,1975, with respect to,

long-term conditions expected at the site. Comparisons were made between

onsite data and those available offsite data that are considered to be reason-ably representative of the Davis-Besse site, as related to the calculation of

' atmospheric diffusion estimates (X/Q).

Although there are no directly comparable wind ' data for the 250-ft level,

these data are presented since they are at the nominal height of release of,

radioactive effluents. Comparison of these data with the 35-ft level andoffsite wind data is made only to indicate that these data do not have un-

usual distributions or anomalies.

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II. WIND DIRECTION AND SPEED.

Wind data collected at the Davis-Besse site are compared to offsite wind data

from Toledo Express Airport and the Enrico Fermi Atomic Power Plant site.

The Davis-Besse site is located on the southern shore of Iake Erie. Toledo,

Express Airport is 40 miles west of the Davis-Besse site, approximately

20 miles from Lake Erie. The Fe..nl site is 26 miles north-northwest of the

Davis-Besse site on the western shore of Lake Erie. The terrain in the vicinity

of all three locations is flat.'

Figures 1 through 10 present the Davis-Besse onsite monthly, seasonal, and

annual distributions of wind direction and speed for the 35- and 250-ft levels,

during the period August 4,1974-August 3,1975. Prevailing winds for both

levels were from the southwest.

Figures 11 through 15 present monthly, seasonal, and annual wind speed and-

direction distributions for the Toledo Express Airport for the same 1-yr period

as the onsite data . The Toledo Express Airport distributions are based on

3-hourly observations (once every 3 hr, eight observations per 24-hr per-,

tod). The wind instrumentation at the Toledo Express Airport was at 30 ft

above ground level (AGL) during this period. Comparison of these figures

with Figures 1 through 10 shows good agreement on a seasonal and annual

basis between onsite and Toledo Express Airport observations. There is a

higher frequency of calms noted at the Toledo Express Airport. This is,mainlydue to the higher starting threshold of the anemometer used at the airport

compared to that at the Davis-Besse site (-2.0 mph vs less than 1.0 inph)..:

Figurus 16 and 17 present seasonal and annual wind direction and wind speed

distributions for the Toledo Express Airport for the 10-yr period January 1,1960-

December 31, 1969. These dist ;butions are based on hourly data (24 observa-,

tions per 24-hr period) for January 1,1960-December 31,1964, and 3-hourly.

observations for the remainder of the period. The wind sensor was at a height

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of 20 ft AGL from January 1,1960, to November 1,1968, and at 30 ft AGL'

, thereafter. This difference in sensor heights should be relatively inconsequen-tial for summaries of wind data for the entire 10-yr period. Comparison of

these figures with onsite data and the Toledo Express Airport data covering the

, . Same 1-yr period as the onsite data shows general agreement between the data

sets and consistent patterns for the prevailing wind.

Additional wind direction data that were examined were those collected at the'

Enrico Fermi Atomic Power Plant Site. The Fermi site data, collected at the

33-ft (reported as 10-m) and 197-ft (reported as 60-m) levels for the period

September 1,1973-August 31, 1974, show good agreement on an annual basis

with onsite data. Fermi site data are presented in Re f.1.,

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Table 1 presents monthly, seasonal, and annual wind speed data for the

Davis-Besse site (35- and 250-ft levels), the Toledo Express Airport (con-

current and 10-yr summaries), and the Fermi site (33-ft level). Examinationof the table shows good agreement among all data sets,

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. III. WIND DIRECTION PERSISTENCE

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Wind direction persistence is defined for this report as a continuous wind flow

from a given 22.5-degree sector. In Table 2 is presented the probability,

of wind direction persistence for the 35- and 250-ft levels for the August

4,1974-August 3,1975, onsite data and the January 1,1960-December 31,

1964 Toledo Express Airport data. (Only hourly data can be used for wind direc-'

tion persistence analysis.) Comparison of the 35-ft onsite data to the 5-yr

Toledo Express Airport data shows good agreement for all probabilities. How-

ever, the Fermi site data for September 1,1973-August 31, 1974, presented

in Ref.1, indicate lower probabilities of wind direction persistence periods,

than do either the Davis-Besse site data or the~ Toledo Express Airport long-

term data.

Table 3 presents the maximum one-sector wind direction persistence periods

for each of the 16 directions plus calms for the 1-yr onsite data. The maximum

wind direction persistence at the 35-ft level was associated with a 23-hr wind

from the west-southwest. The maximum wind direction persistence period at,

the 250-ft level was associated with a 26-hr wind from the east.

Table 4 presents the maximum wind direction persistence periods for the Toledo

Express Airport for January 1,1960-December 31, 1964. The maximum was

associated with a 37-hr wind frun the east-northeast. Maximum wind direction~

persistence periods from the Fermi data are presented in Ref.1. These data

are generally consistent with the Davis-Besse arxi Toledo Express Airport re-]

suits presented in this report, with the maximum persistence periods being !1

associated with winds from the northeast and southwest, and with a secondary

maximum to the northwest.i

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, IV. ATMOSPHERIC STABILITY

The parameter used to classify onsite atmosphe-ic stability is the vertical tem-

perature difference (AT). Data collected at the Davis-Besse site for the tem-,

perature difference between the 250- and 35-ft levels (6T250'-35,) are used incalculating the diffusion estimates.

No representative long-term offsite 6T data are available for comparison with'

onsite data. However, there are two other nuclear power plant sites on the

shore of Lake Erie at which 1 year of 6T measurements have been made and

stability distribution data are readily available. These two sites are the,

Fermi site and the Perry Nuclear Power Plart site, which is located approximate-ly 100 miles east-northeast of the Davis-Besse site.

When comparing 6T distributions from sites near a large body of water, such

as Iake Erie, the orientation of the sites to the lake and the distance inland

from the lake of the temperature sensors' are important in assessing the modi-

, fication of temperatures associated with the lake-land interface.

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The stability data from the Fermi site were obtained from a meteorological

tower located within 200 ft of the shoreline of Lake Erie (Ref.1.). The Davis-Besse and Perry towers are 6100 and 3700 ft, respectively, from the lakeshore !

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(Refs. 2 and 3). The general topography in the vicinity of all three locations' - is similar (flat). However, becauss of the relative locations of the meteoro- I

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logical towers with respect to the lake at Davis-Besse, Fermi, and Perry,'

only Perry 6T data can be realistically compared to Davis-Besse 6T data.|

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Annual distributions of stability classes based on 6T250'-35, f r DaWs-Besseand 6T200'-35, f r Perry are presented in Table 5.

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The actual distributions from the two locations are not identical, of course,;

, mainly because of differences in locations, data periods, and sensor separa-'

tions . However, the trends for the two data sets are very similar, with thelargest occurrence being the neutral (D) and slightly stable (E) classes.

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,V. SUMMARY AND CONCLUSIONS

The 1-yr onsite data have been compared with the following offsite data:

1. Longer term (10-yr) data from the Toledo Express Airport.

2. Concurrent data from the Toledo Express Airport.,

3. One-year data frcm the site of the Enrico Fermi Atomic Power

Plant.

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4. One-year data from the site of the Perry Nuclear Power Plant.

The comparison shows good agreement for all pertinent data used for diffusion'

estimate calculations. No significant anomalies or departures from expected -

normals for these pertinent data were found. Wind speed and direction distri-

butionc and wind persistence data are in general agreement with the Toledo Express

Airport and Fermi data. No representative long-term offsite AT data or direct-,

ly comparable stability data are available for analysis. For comparison pur-

poses, AT stability distributions from the Perry Nuclear Power Plant site also

on the southern shore of Iake Erie were examined. The annual AT200'-35'distributions from the Perry site for the 1 yr examined are very similar (with

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allowances for differences in locations, data periods, and sensor separations)to the onsite Davis-Besse AT * * *250'-35'

On the basis of these results, the onsite data for this period are considered to

be representative of the long-term conditions to be expected at the Davis- '

Besse site.

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REFERENCES

1. - Enrico Fermi Atomic Power Plant Unit 2 - Final Safety Analysis Report,AEC Docket No. 50-341, Section 2.3. '

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2. Davis-Besse Nuclear Power Station Units 2 & 3 - Preliminarv SafetyAnalysis Report, AEC Docket Nos. 50-500 and 50-501, Revision 4,Section 2.3.

3. Perry Nuclear Power Plant Units 1 and 2 - Preliminary Safety Analysis'

Report, AEC Docket Nos. 50-440 and 50-441, Section 2.3.

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TABLE 1

AVERAGE WIND SPEEDS FOR THE DAVIS-BESSE SITE, THE TOLEDO EXPRESS AIRPORT,AND THE FERMI SITE

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Level Aug. Sep. Oct. Nov. Dec. JaA Feb. Mar. Apr. h v_ June July Spr. Sum. Fall Win. Annual

Davis-Besse Site. August 4. 1974-August 3. 197535-foot 7.0 9.2 9.0 11.0 10.3 12.9 12.3 13.2 12.3 8.6 9.9 7.4 11.3 8.1 9.7 11.9 10.2

250-foot 11.8 15.0 14.8 16.4 15.7 18.5 15.9 18.2 17.3 12.6 14.8 11.2 16.0 12.5 15.4 16.8 15.2

Toledo E* press Airport. August 4. 1974-August 3. 197530-foot 6.5 8.1 8.2 9.7 9.0 11.4 11.1 11.3 10.8 7.9 8.4 6.3 10.0 7.1 8.7 10.5 9.1

Toledo Express Airport. January 1. 1960-December 31, 1969(a) -- -- -- -- -- - -- -- - -- - - 10.6 7.8 8.9 10.8 9.5

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Fermi Site, September 1. 1973-August 31, 197433-foot 7.6 9.6 9.1 10.9 12.1 10.6 11.0 12.0 11.9 11.4 8.8 7.9 11.8 8.1 9.9 11.3 10.5

a. Data for January 1, 1960-November 1, 1968, taken at a 20-foot level; data for November 1. 1968-Decer.ber 31, 1969, taken at a 30-foot level,b. Data from Ref. 1.

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TABLE 2

ONE-SECTOR (22.5-DEGREE) WIND DIRECTION PERSISTENCE PROBABILITY *FOR THE DAVIS-BESSE SITE (AUGUST 4, 1974-AUGUST 3, 1975) ANDTOLEDO EXPRESS AIRPORT (JANUARY 1,1960-DECEMBER 31, 1964)

Probability of Davis-Besse, Davis-Besse, Toledo ExpressPersistence i t (%) 35-ft Level 250-ft Level Airport

1 16.5 21.0 16.0,,

5 10.5 13.0 10.010 8.5 10.0 7.525 5.0 5.5 4.050 2.5 3.0 2.0

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* Includes calms; values rounded to the nearest half hour.

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TABLE 3,

MAXIMUM ONE-SECTOR (22.5-DEGREE) WIND DIRECTIONPERSISTENCE FOR THE DAVIS-BESSE SITE

(AUGUST 4, 1974-AUGUST 3, 1975)

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Maximum Wind Direction Persistence (hr)Wind Direction 35-ft Level 250-ft Level

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| NNE 13 10

.- NE 13 20.,

ENE 10 11

E 21 26

ESE 9 12

SE 10 9<

SSE 9 11

S 12 13

SSW 18 10

SW 14 19,

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WSW 23 15

W 14 23

WNW 7 15

NW 20 25;"

NNW 11 17

N 9 12

Calm 2 2

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MAXIMUM ONE-SECTOR (22.5-DEGREE) WIND DIRECTIONPERSISTENCE FOR TOLEDO EXPRE3S AIRPORT

(JANUARY 1, 1960-DECEMBER 31, 1964)

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Wind Direction Persistence Period (hr)

; NNE 15

NE 18

ENE 37

E 26,

ESE 11

SE 9

SSE 11<

S 16,

SSW 22

SW 16

WSW 31

W 17

WNW 16

hv 17.

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N 19

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TABLE 5-

ANNUAL AT STABILITY DISTRIBUTION * COMPARISONS FOR THEDAVIS-BESSE AND THE PERRY SITES

Stability Category Frequency (%)e,

Site A B C D E F G

Davis-Besse 1.14 2.89 4.22 53.59 27.94 7.27 2.95(8/4/74-8/3/75),AT250'-35'

Perry ** 4.84 3.58 4.81 47.97 24.68 7.37 6.75(5/1/72-4/30/73),0 200'-35'

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* Categories are based on Regulatory Guide 1.23 classification.** Data from Ref. 3.

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Figure 10. Davis-Besse site annual wind distritations at the 250-ft |

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Figure 11. Toledo Express Airport monthly wind distributions: August,September, October, and November 1974.

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Figure 12. Toledo Express Airport monthly wind distributions: Decem-ber 1974, Janu cy, February, and March 1975.

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Figure 13. Toledo Express Airport monthly wind distributions: April,May, June, and July 1975.

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Figure 15. Tcledo Express Airport annual wind distributions, August 4,1974-August 3, 1975.

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Figure 16. Toledo Express Airport seasonal wind distributions,January 1, 1960-December 31, 1969.

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