ML20004C520
| ML20004C520 | |
| Person / Time | |
|---|---|
| Site: | Callaway  |
| Issue date: | 05/29/1981 |
| From: | Tedesco R Office of Nuclear Reactor Regulation |
| To: | Bryan J UNION ELECTRIC CO. |
| References | |
| NUDOCS 8106040210 | |
| Download: ML20004C520 (4) | |
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MAY 2 91981 Docket No.: STN 50-483 Mr. John K. Bryan Vice President Union Electric Company 1901 Gratiot Street Post Office Box 149 St. Louis, Missouri 63166
Dear Mr. Bryan:
Subject:
Request for Additional Information for the Review of the Callaway Plant, Unit 1 Concerning Meteorology As a result of our continuing review of the Callaway Plant, Unit i FSAR, we find that we need additional information to complete our evaluation. The specific information rrquired is in the area of meteorology and is presented in the Enclosure.
To maintain our licensing review schedule for the Callaway Plant FSAR, we will need responses to the enclosed request by June 19, 1981.
If you cannot meet this date, please inform us within seven days after receipt.
of this letter 6f the date you plan to submit your responses so that we -
may review our schedule for any necessary changes.
Please contact Mr. Dromerick, Callaway Licensing Project Manager, if you desire any discussion or clarification of the enclosed request.
Sincerely, dM.
Robert L. Tedesco, Assistant Director for Licensing i
Division of Licensing l
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Enclosure:
As stated e
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Mr. J. X. Bryan Vice President - Nuclear Union Electric Company P. O. Box 149 St. Louis, Missouri 63166.
Mr. Silliam' Hansen Mr. Nicholas A. Petrick Resident Inspector /Callaway NPS cc:
Executive Director - SNUPPS 5 Choke Cherry Road c/o USNRC Rockville, Maryland 208,50 Steedman, Missouri 65077_
Gerald Charnoff, Esq.
Shaw, Pittman, Potts &
Trowbridge 1800 M Street, N. W.'
Washington, D. C.
20036 Mr. J. E. Birk Assistant to the General Counsel Union Electric Company P. O. Box 149 St. Louis, Missouri 63166 Dr. Vern Starks Route 1, Box 863 Ketchikan, Alaska 99901
.e Ms. Trevasearn, Assistant General Counsel Missouri Public Service Commissiv.1 P. O. Box 360 Jefferson City, Missouri 65102 Mr. D. F. Schnell Manager-Nuclear Engineering Union Electric Company P. O. Box 149 St. Louis, Missouri 63166 l
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c ; ;.W REQUEST FOR ADDITIONAL INFORMATION CALLAWAY UrlIT 1 DOCKET fl0. STN 50-483 450.0 Mat'eoroloay 451.lC the f requency of lightning strikes is not presented in the discussion of i
severe. weather.and extreme meteorological ccnditions in Section 2.3.1 of the FSAR. Provide seasonal and annual estimates of lightning strikes to I
safetf-related structures at the site considering the " attractive area" of the structures. A suggested reference for this type of analysis is J. L.
Marshall, Lightning Protection,:1973.. See also Section 2.3.1 of the Wolf Creek FSAR for a discussion of expected lightning strikes to ground as a function of-number of thunderstorms.
451.2C The tornado statistics presented in Section 2.3.1.2.6 are based on a regional data base that ended in 1971.
Identify any tornadoes that have occurred in the vicin ty of the site since 1971, nd provide estimates i
of the intensity (maximum wind speed) and path area of each. Compare the annual tornado strike probability for this period with strike probabilit,es i
determined for pr'evious periods of~ record (see pages 2.3-6 and 2.3-7).
451.3C Describe the procedures used for determining the meteorological conditions which would result in the minimum heat transfer rates (Tables 2.3-13 and i.
2.3-14) and the greatest evaporation from the retention pond (Table 2.3-15) for design of the ultimate heat sink.
451.4C Table 2.3-37 of the FSAR indicates that moderately stable (Pasquill Type F) and extremely stable (Pasquill type G) conditions have persisted for 20-and 19-hour periods, respectively, at the Callaway. site during the period May 1973 - May 1975. Persistence of these stability classes for periods greater than 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> is very unusual. Discuss the causes of persistent stability conditions for greater than _12 honrs for classes F and G.
Identify the syr. optic conditions during the observed periods of persistent j
j F and G stability classes for periods greater than 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br />, and discuss the possibility of instrument malfunction.
451.5C In the discussion of the potential influence of the 'lant and its facilities p
on local meteorology (Section 2.3.2.2), two somewhat different sets of design parameters for the natural draft cooling towers are presented (see pages 2.3-23 and 2.3-31). Clarify the design characteristics for the natural draft cooling towers, particularly for the exit diameter and heat rejection rate.
451.6C In the calculation of cooling system impacts, wind speed and wind direction measurements at the 60m level were used to determine conditior,s represen-4 tative of the top of the cooling tower (at about 170m above the surface).
Discuss the rationale for using measurements from the 60m level when similar measurements were available from the 90m level. Also discuss the validity of use of the wind speed power law described on pages 2.3-25 and 2.3-26 to extrapolate from measurements at 60m to represent conditions at'170m.
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The discussion of data recovery on page 2.3-49 indicates that data from 451.7C other levels and intervals were substituted to enhance the data recovery for the primary measurements.-i.e., wind speed and wind direction at Prelimin-the 10m level and temperature difference between 10m and 60m.
ary analysis of the hour-by-hour meteorological data provided on magnetic tape suggests that about 23f, of the primary data for the combined three- -
had to be substituted for the year period (5/73 - 5/75 and 3/78 - 3/79) primary measurements. " Discuss the problems with the data collection program which necessitated such a large fraction of substituted data,,
and indicate what modifications Will be made to the operational program to enhance data recovery of the primary meteorological measurements.
Also discuss the difficulties in measuring precipitation at the site which necessitated use of precipitation data from Columbia, and indicate the real-time representativeness of Columbia precipitation data for use 4
at the Callaway site.
451.8C Describe the status of the onsite meteorological measurements program since March 1979.
2.3-66, 2.3-67, and 2.3-68 present terrain / recirculation correc-451.9C Tables tion factors to be applied to a straight-line Gaussian dispersion model to better. characterize temporal variations in meteorological conditions.
These correction factors were estimated based on the results of a vari-able-trajectory puff advection model using one year of hour-by-hour Substantial reductions (up meteorological data from the Callaway site.
to a f actor of 100. lower than the straight-line model) are suggested for distances approaching 50 miles. Discuss the reasonableness and.appro-priateness of correction f actors for receptors at distances greater than about a variable-trajectory model-r 5 miles frcm the source developed by use o with only a single source of meteorological data as input. Also discuss the use of site-soecific wind speed profiles for this analysis when standard wind speed profiles are assumed for data substitution and cooling tower impact assessments.
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