ML19317F099
| ML19317F099 | |
| Person / Time | |
|---|---|
| Site: | Oconee  |
| Issue date: | 10/19/1972 |
| From: | Harold Denton US ATOMIC ENERGY COMMISSION (AEC) |
| To: | Deyoung R US ATOMIC ENERGY COMMISSION (AEC) |
| References | |
| NUDOCS 8001080788 | |
| Download: ML19317F099 (4) | |
Text
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Docket Fil 270 & 50-287 /
L - Rdg L:AD/SS L:SAB OCT 19 M R. C. DeYoung, Assistant Director for PWR's, L METEOROLOGY INPU2 TO ACES REPORT PLANT NAME: Oconee Nuclear Station, Units 2 and 3 LICEliSING STAGE: OL DOCKET IMER: 50-270 and 50-287 REEPOIBIBLE BRANCH WR #h REQUESTED COMPLETION DATE: 9/25/72 APPLICAY. rS FJ.SPGESE DATE EECESSARY FOR NEXT ACTION PLUINED ON PROJECT: None DESCRIPTION OF RESPOI3E: N/A REVIEW STATUS: Site Analysis Branch Meteorological Analysis Ccxsplete Attached is the meteort,2Ogy cection for inclusien in the report to the ACRS on the subject plar.t. Ourconsultant(NOAA)willprovide updated cons::ents by October 24, 157/2.
This section was prepared by E. H. Markee, Jr., Bite Ana.Vcia Branch, L.
~ ~ ~ ' *
- unc g., B, Denton Haroll R. Denton, Assistant Director for Site Safety Directorate of Licensing
Enclosure:
As stated cc: v/o enclosure A. Giambusso W. Mcdonald w/ enclosure cc S. H. Hanauer J. Hendrie W. P. n==111 A. Schwencer I. A. Peltier J. Eastner E. H. Markee d h-0 omer *
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-UNITS 2 AND 3 DOCET NOS. 50-270 AND 50-287 ACRS REPORT INFis7 2.3 IGTEOROLOGY 2.3.1 Regional Meteorology Western South Carolina is far south of major storm tracks but experiences higher precipitation amounts than the east coast due to its location in the lee of the Appalachian Mountains. A semipermanent belt of high pressure usually influences the regional climate..During the fall season the area has a high probability of experiencing atmospheric stagnation during which the large scale dilution rate for effluents is low due to low wind speeds.
2.3.2. Local Meteoroloey l
The plants will be situated on Lake Keowee which was established l
-to provide cooling for the three power plants. The topography in the vicinity of the site is hilly and the local airficw i;.
influenced to some extent by the contour of the lake. The f
l prevailing winds are split between the southwest and northeast t-quadrants d.ne to the lake orientations and large scale pressure effects.
l 2.3.3 Onsite Meteoroloeical Measurements Program l
A~ preliminary meteorological survey of the site frcm October 1966 1
to October 1967 was based on a wind system located on a lh-meter pole and thermographs in standard Weather Bureau Shelters stationed I
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2-on the site'at varying terrain elevations.
Beginning in November
- 1967, a 46-meter tower on a knoll 850 feet WNW of the reactor complex was instrumented with a sensitive wind system at the 46-meter level and an aspirated, shielded temperature system with temperature units at the 2, 10, 28-and 46-meter levels. The applicant initially submitted a one year period of data record (June 19, 1968 -
June 18, 1969) in joint frequency distribution form using vertical temperature difference cat) between the h6-and 2-meter levels to stratify the data into stability categories. However, there were wind calibration problems associated with these data. Due to the delay in the construction of Units 2 and 3, a two year period of record (March 15,1970 - March 14,1972) of onsite tower data for the sane levels after the filling of Lake Keowee was submitted for evaluation at the request of the staff.
These data were free of calibration problems and the 4T class intervals were presented as suggested in Safety Guide 23. The data recovery for this
' period of record was 82%.
2.3.4 Short Term (Accident)L.ffusion Estimates In evaluation of diffusion of short-term accidental releases from the plant, a gzm s' level release with a building wake factor, 2
cA, of 1270m was assumed. The wind speeds at the 150-foot level of the tower were multiplied by 0.8 to achieve a representation L
of the winds appropriate to a ground level release. The relative concentration (X/Q)whichisexceeded5%ofthetimewascalculated 3
to be 2.2 x 10~
sec/m at the exclusion radius of 1609m. This relative concentration is equivalent to dispersion conditions h
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produced by Pasquill type F stability with a wind speed of 1 meter /second. The applicant has used a value which i's between a factor of two and three lower than the staff's value due to his use of a valley drainage model.
The applicant has presented wind direction and speed persistence information for long periods of record from Greenville and Donaldson Air Force Base, South Carolina from which he has made estimates of relatbe concentrations for time periods up to 30 days. These estimates are in essential agreement with those presented in Safety Guide 4 Therefore, the staff concludes that the relative concentrations presented in Safety Guide h provide adequately conservative estimates for the outer boundary of the low population zone (9654u).
2.3.5 long Term (Routine) Diffusion Estimates The maximum annual average relative concentration of 3.6 x 10-6 3
sec/m was found at the exclusion radius (1600m) south of the plants. This value is lower than the applicant's value by about
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25% due primarily to his use of the 1968-1969 data.
1 1
2 3.6 conclusion It is our opinion that the two years of data after the filling of Lake Keowee provide an acceptable basis for evaluation of atmos-pheric diffusion for accidental and routine gaseous effluent
- releases from the plant.
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