ML20197H955
| ML20197H955 | |
| Person / Time | |
|---|---|
| Site: | Vogtle  |
| Issue date: | 08/03/1984 |
| From: | Muller D Office of Nuclear Reactor Regulation |
| To: | Novak T Office of Nuclear Reactor Regulation |
| Shared Package | |
| ML20197G423 | List: |
| References | |
| FOIA-84-663 NUDOCS 8408090375 | |
| Download: ML20197H955 (7) | |
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DISTRIBUTION:
Docket File 50-424 Docket File 50-425 (w/o encl METB Docket File METB Reading File ADRP Reading File Docket Nos. 50-424/425 MG 03 q MEMORANDUM FOR: Thomas M. Novak, Assistant Director for Licensing, DL FROM:
Daniel R. Muller, Assistant Director for Radiation Protection, DSI
SUBJECT:
METEOROLOGY INPUT TO DRAFT ENVIRONMENTAL STATEMENT FOR V0GTLE Enclosed is the meteorology input for inclusion in the Draft Environmental Statement for the Vogtle Electric Generating Plant.
Although a specific format was not available, we have prepared input for the following sections: Meteorology, to be included in Section 4.3, Project-Related Environmental Descriptions; Air Quality, Section 5.4; and Atmospheric Monitoring, to be included in the environmental monitoring section of Chapter 5.
We have also included an insert for Appendix D, Examples of Site-Specific Dose Assessment Calculations, which describes the meteorological data base and atmospheric dispersion model used for dose assessment.
This input was prepared by J. Fairobent, Meteorology and Effluent Treatment Branch, and any questions should be directed to him at x29427.
Maical sigacd by DE. uy q M
Daniel R. Muller, Assistant Director for Radiation Protection Division of Systems Integration
Enclosure:
As stated cc:
R. Bernero R. Capra E. Adensam W. Gammill M. Miller I. Spickler J. Fairobent OkOh.fj4$
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t 4.3.X Neteorology The discussion of the general climatology of the site and vicinity contained in the FES-CP remains unchanged. Some of the information on extreme meteorological conditions and severe weather phenomena can be updated.
Extreme' temperatures of 41.7 C (107"F) and -16.1 C (3 F) have been reported at Augusta, Georgia. About 77 thunderstorms can be expected on about 56 days each year. Hail often accompanies severe thunderstorms. During the period 1955-1967, 6 occurrences of hail with diameters greater than 19mm (3/4 inch) were reported in the latitude-longitude box containing the site. Tornadoes also occur in the area. The FES-CP provides a conservative estimate of the recurrence interval for a tornado at the plant site (500 years). Hurricanes or remnants of hurricanes pass through-the region occasionally.
During the period 1871-1982, 40 tropical cyclones (tropical depressions, tropical storms and hurricanes) passed within 100 nautical miles of the site.
2 Since issuance of the FES CP, the applicant has collected 3 additional years (April 4,1977-April 4,1979 and April 1,1980-March 31,1981) of onsite meteorological data.
For this period of record, winds at the 10m (33-ft) level are well-distributed. Wind direction frequencies vary from about 4% to about 8.5%.
The median wind speed at the 10m level is about 2.5 m/sec (5.6 mph). Calm conditions (defined as wind speeds less than af re ny.m ME GILP& '
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a the starting threshold of the anemometer) occur infrequently, at about 0.5%
of the time. Slightly stable (Pasquill type "E") conditions predominate at the Vogtle site, occurring about 34% of the time, as defined by the vertical temperature gradient between the 45.7m and 10m levels for the 3-year period described above. Moderately stable (Pasquill type "F") and extremely stable (Pasquill type "G) conditions occur about 16% and 9% of the time, respectively, using the same stability indicator. Moderately stable and extremely stable conditions were observed with relatively the same frequency during the pre-operational program (December 4, 1979-December 4,1973) for the Vogtle plant.
5.4 Air Quality 5.4.1 Fog and Ice As stated in the FES-CP, atmospheric emissions from the natural draf t cooling tower will consist primarily of waste heat and water vapor.
The general conclusions of the FES-CP, with respect to atmospheric im7 acts due to cooling tower operatioA, remain unchanged.
The staff concluded in the FES-CP that " operation of the natural draft cooling towers at Vogtle would not measurably increase ground fogging in the area."
In addition, the staff provided estimates in the FES-CP of the visible plume from the F
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3-natural draft cooling towers for " average" conditions and these estimates indicated a small visible plume, dissipating very quickly downwind of the towers. From information presented in the FES-CP, the impact of the cooling tower upon climatic conditions appears to be negligible.
5.4.2 Other Emissions As indicated in the FES-CP, non-radioactive pollutants (e.g., S02 '"d N0 ) produced by operation of emergency diesel generators and auxiliary x
boilers should not significantly degrade air quality in the vicinity of the plant. As stated in the ER, the applicant has agreed to operate the auxiliary boilers in accordance with a State of Georgia permit to limit emissions. Furthermore, the applicant has stated in the ER that the State of Georgia exempted the diesel generators from air quality permitting requirements because of the low rates of emissions.
X.X.X Atmospheric Monitoring The FES-CP did not contaiA a description of the onsite meteorological measurements program.
Onsite meteorological measurements at the Vogtle site were initiated in April 1972. The meteorological tower used to provide data used in support at 4
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. of both the Construction Permit and Operating License applications is located about 1500m (5000-ft) south-southwest of the Unit I containment building. Wind speed and direction are measured at the 10m (33-ft) and 45.7m (150-ft) levels, and vertical temperature gradient is measured between the 45.7m and 10m levels. Ambient dry bulb and dew point temperatures are measured at the 10m level, and precipitation and solar radiation are measured near the ground. The applicant has performed an analysis of the overall measurements system accuracies for each parameter, and concluded that the system accuracies for analog recording are not within the specifications presented in Regulatory Guide 1.23.
System accuracies for digital recording appear to comply with the specifications presented in Regulatory Guide 1.23.
The meteorological data provided with the Operating License applicant have been..Secked for reasonableness.
The preliminary results indicate that the data c 11ected by the meteorological measurements program are reasonable compared o other data collected in the area; however, the check is not yet complete.
The final analysis of data quality and reasonableness will be presented in the FES.
Three years (April 4,1977-April 4,1979 and April 1,1980-March 31,1981) of meteorological data were provided with the Operating License application. These 3 years of data were combined into joint frequency
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distributions of wind speed and wind direction by atmospheric stat ility for I
use in the atmospheric dispersion assessment described in Appendix D.
Data recovery for the composite data set was about 92%.
Because the periods of missing data were sufficiently random, the 3-year period of record is expected to reasonably reflect diurnal, seasonal, and annual airflow and stability patterns subject to the final determination of data quality, as described above.
The applicant will upgrade the meteorological measurements prograrr. for use during plant operation. The upgrade will include installation of a new meteorological tower in the vicinity of the tower location descrit>ed above, and will include measurements at the 10m and 60m (197-ft) levels.
The applicant has indicated that a minimum of 1 year of valid data from the new measurements program will be available prior to fuel load. These data will be reviewed by the staff for quality and consistency when the data become available.
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i Insert into Appendix D Annual average relative concentration (X/Q) and relative deposition (D/Q) were calculated using the straight-line Gaussian atmospheric dispersion model described in Regulatory Guide 1.111, modified to reflect spatial and temporal variations in airflow using the correction factors contained in NUREG-2919. Releases from the plant vents (atop the containment building) were considered as a mixture of elevated and ground level, except for the transport directions (affected sectors) of east-northeast and east, where the natural draft cooling towers could significantly affect atmospheric dispersion. For the transport directions of east-northeast and east, releases from the plant vents were considered as ground-level.
Releases from the turbine building (including the air ejector exhausts) were considered as ground level, with mixing in the turbulent wake of the major plant structures.
Releases from the radwaste building were also considered as ground level, with mixing in the turbulent wake of that building. All releases were assumed to be continuous.
A 3-year composite set of"onsite meteorological data (April 4,1977-April 4, 1979 and April 1, 1980-March 31, 1981) was used for this evaluation. Wind speed and direction data were based on measurements made' at the 10m (33-f t) level, and atmospheric stability was defined by the vertical temperature gradient measured between the 45.7m (150-ft) and 10m levels.
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