ML20138H468
| ML20138H468 | |
| Person / Time | |
|---|---|
| Site: | Catawba  |
| Issue date: | 12/05/1985 |
| From: | Tucker H DUKE POWER CO. |
| To: | Harold Denton, Youngblood B Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 8512170205 | |
| Download: ML20138H468 (3) | |
Text
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L DUKE POWER GOMI%NY l'.o.Hox 33180 CliAHL(FTTE, N.C. 2824u
. (704) 373-4SM P
scram 4m ruunnicTion December-5, 1985 Mr._. Harold R. Denton, Director Office of. Nuclear Reactor Regulation U. S. Nuclear Regulatory Commission Washington, D._C.
20555 Attention:
Mr. B.
J. Youngblood, Project Director PWR Project Directorate No. 4 Re:
Catawba Nuclear Station, Units 1 and 2 Docket Nos. 50-413 and 50-414
Dear Sir:
At the request of NRC Staff, we are providing a summary of the activities and monitoring locations for the preoperational and operational phases of the fog monitoring program which is. required by the Catawba Environmental-Protection Plan.
As indicated in the attached summary, we have commenced the operational phase of the program and will continue. to monitor throughout the first year of continued' operation of Unit 2.
Very truly yours,
- A c~L/d Hal B. Tucker WLH: sib
-cc:
Dr. J. Nelson Grace, Regional Administrator U. S.' Nuclear Regulatory Commission
. Region II 101 Marietta Street, NW, Suite 2900 Atlanta, Georgia 30323 NRC Resident Inspector Catawba Nuclear Station.
Dr. K. Jabbour Office of Nuclear Reactor Regulation U. S. Nuclear Regulatory Commission U
Washington, D. C.
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FOB (BENAROYA)
Fog Study plan As part of the licensing process of 'the Catawba Nuclear Station, the NRC has required that a study be performed to assess the effects of the station heat dissipation system on the intensity and frequency of ground fog.
Emphasis is on
- identifying measurable changes in fog characteristics which may have potential adverse economic and/or aesthetic impacts on Lake Wylie and the surrounding com-muni ties. The study is designed to address the impact of increased surface water temperatures from plant discharges; increased atmospheric moisture from vapor due to cooling tower plume downwash, plume dispersion, or drift evapora-tion; and increased fog condensation nuclei from cooling tower drift.
The preoperational phase of the study is completed and consists of two years of data (August 10, 1977 - August 9,1979). The data includes visiometer and sur-face water temperature measurements conducted at the following two locations:
Location 1, about 800 m north of the cooling towers near the plant cooling water intake; and Location 2, about 250 m south of the cooling towers near the plant cooling water discharge.. Daily morning fog observations at Location 2 taken by trained security personnel were taken during the same time per.od. The obser-vations compare conditions at Location 2 to prevailing conditions on adjacent land and water. Trained personnel at Wylie Hydro Station (located about 6 km east-southeast of the plant) similarly described visibility conditions over the lake and land areas visible from the dam. When atmospheric conditions were con-ducive to the formation of steam fog, Duke Power Company Meteorologists conduct-ed qualitative observations of the horizontal and vertical extent of the fog, as well as transport of the fog off the lake. Observation locations included visio-meter Locations 1 and 2, Wylie Hydro Station, Ebenezer Boat Landing (loc'ted a
approximately 4 km southeast of the plant), I-77 at the Catawba River Crossing, Tega Cay residential community (3 km southeast of the plant), the municipal air.
port (located about 8 km south of the plant) and a nearby firetower giving a total view of the lake. The extent of the fog situation can be assessed at all communities on Lake Wylie from these locations including the community 1.6 km east of the plant.
The operational phase of the study will consist of the same components as the preoperational program. Visiometer and surface water temperature measurements began September 1,1985 at the same locations.
Daily morning fog observations I
by. Catawba security and Wylie Hydro personnel began September 1,1984 using the same criteria and observation locations as the preoperational study.
In addi-tion, a cooling tower plume questionnaire is filled out by Catawba security during the fog observations when the towers are operational. The plume ques-tionnaire is designed to document the characteristics of the cooling tower plume itself in terms of visibility, drift and icing on surrounding public and private lands. Qualitative observations by company meteorol'ogists will continue at the same locations as in the preoperational study when foo conditioris w' arrant.
.The operational monitoring program will conclude one year after startup and con-tinued operation of Unit 2.
At the conclusion of the monitoring period a final report shall be submitted as part of the Annual Environmental 0perating Report.
The report will include:
- a complete description of the Catawba Fog Study program noting similarities and differences between the operational and preoperational programs;
- quantitative and qualitative results;
- interpretative analyses of the frequency and intensity of ground fog induced by plant operation, particularly at.the nearby residential community and municipal airport, using comparisons of the results of the preoperational and operational monitoring programs; and
- a discussion of the need for continued monitoring and/or mitigating actions to lessen the atmospheric impac't of plant operation.
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