ML19329E859
| ML19329E859 | |
| Person / Time | |
|---|---|
| Site: | Midland |
| Issue date: | 09/09/1974 |
| From: | Engle L US ATOMIC ENERGY COMMISSION (AEC) |
| To: | Boyd R, Anthony Giambusso, Varga S US ATOMIC ENERGY COMMISSION (AEC) |
| References | |
| NUDOCS 8006180656 | |
| Download: ML19329E859 (5) | |
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SEP 9 1974 DOCKET NOS.: 50-329 AtlD 50-330 l
APplICAtiT
- C0flSUMERS POWER COMPAtlY THIS DOCUMENT CONTAINS P00R QUAUTY PAGES FACILITY
- MIDLAND PLANT, UNITS 1 AND 2
SUMMARY
OF MEETING TO DISCUSS APPLICAflT'S PROCEDURE FOR ANALYSIS OF THE HIDLAND EMERGENCY C0OLING POND AS APPLICABLE TO REGULATORY GUIDE 1.27 1
Representatives of the Regulatory staff and the Consumers Power Company met i
in Bethesda, Maryland on August 28, 1974. An attendance list is enclosed.
Meteorological Data Base Selection The applicant indicated that the meteorological data required for simulation of surface heat exchange processes for a cooling pond are dry-bulb temper-ature, humidity, wind speed, cloud cover, and solar radiation. The above parameters would be referred to as the " complete set" of data. A complete set of meteorological data for Lansing, Michigan covers a period from 1910 i
to 1973. For Saginaw, Michigan, the complete set of data covers the period from 1938 to 1973. Comparisons of maximum 1-day and 30-day periods of equilibrium temperature and natural evaporation rate, and frequency distri-l butions of equilibrium temperature, natural evaporation rate and wind speed, indicate the Lansing meteorology will be conservative with respect to both thermal performance and 30-day evaporative water losses. These results and the fact that there is an additional 28 years of complete data make Lansing a preferable choice as a data base, even though Saginaw is only about 15 miles from the site as compared to Lansing which is about 60 miles.
The applicant indicated that 15 years of the Lansing data is available on 1.
magnetic tape and inquired if the Regulatory staff would approve the use of this 15 year period as input for the applicant's analysis. The staff i
i indicated the Lansing 15-year data was acceptable provided the applicant made an examination of other data to ensure the data base to be used by 4
l the applicant included maxir.m reconfed values.
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The analysis of the full period of complete meteorological data will involve identifying the following periods:
1.
Several of the top ranking 1-day average and 30-day average periods of highest equilibrium temperature.
2.
Thehighest30-dayaverageperiodofdewpointdepression(dry-tulb)temperatureanddewpointtemperature).
3.
The highest 30-day average period of natural evaporation rate.
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l Pond Performance Analysis i
The applicant indicated that pond perfomance will be analyzed with the
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PLGSPR cooling pond model.
The initial temperature of the emergency cooling pond will be detemined by transient simulation of the operatica of the large cooling pond. The i
applicant indicated that this approach is necessary b:ause the emergency i
pond is located in the bottom of the cold leg of the large cooling pond.
The large pond operation will be simulated for a 30-dsy period using daily averaged meteorological parameters corresponding to the 30-day period with the highest equilibrium temperature. The highest simulated pond outlet temperature during this 30-day simulation period will be used as the initial emergency pond terperature.
The meteorology input for simulation of the emergency pond perfomance was indicated to be as follows:
1.
Time period (0-1 day) average 1-day meteorological parameters corresponding to the day with the highest equilibrium temperature.
l 2.
Timeperiod(1 day-30 days) average 30-daymeteorological parameters corresponding to the 30-day period with the highest equilibrium temperature.
Emergency pond performance will be simulated for meteorology corresponding to as many of the high ranking 1-day and 30-day periods of equilibrium temperature as is necessary to insure that the highest pond outlet temper-atures are determined. Once the worst case 1-day and 30-day meteorology l
periods, with respect to high pond outlet taperature, are detamined, the actual hourly meteorological data will be used to investigate the effect of diurnal fluctuations.
Emergency pond performance will be simulated for the LOCA accident occurring at various times during the day in order to be certain.that the highest possible peak pond outlet temperature is determined.
.c Analysis' of pond evaporation losses will be done for two cases. The first I
will utilize 30-day average meteorological parameters corresponding to the 30-day period with maximum dew point depression. The second will utilize 30-day average meteorological parameters corresponding to the 30-day period of maximum natural evaporation rate. For each case, the wind speed used will be the higher of the following two.
1 1.
The highest average daily wind speed during the 30-day period of maximum dew point depression for the first case, or during the
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30-day period of maximum natural evaporation rate for the second c..
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The maximum 30-day average wind speed for the full period of complete meteorological data.
The larger value of total evaporation detemined for the two cases i
analyzed will be used for design.
l Wind Speed Functions The mathematical formulations of evaporative and conductive heat loss from a water surface involve the concept of a wind speed function. The applicant indicated that Ryan's function provides the most accurate i
estimate of pond temperature perfomance, but for the analysis of the i
Midland emergency cooling pond, Brady's wind speed function would be used as it is more conservative than Ryan's function.
Cooling Pond Model The applicant stated that the PLGSPR model simulates the operation of a stratified,two-layer cooling pond with horizontal temperature gradients in the upper and lower layers, and that the flow regime is two dimensional.
Surface heat exchange is computed on a tem by term basis (solar radiation, i
atmospheric radiation, back radiation, evaporation, conduction) and does not make use of the linearized approach.
The Regulatory staff indicated whereas the PLGSpR is a new model, they would request that the applicant make an effort to verify the model with available physical data and by field investigations.
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Wind Shadow Effects I
The applicant indicated that an attempt will be made to analyze wind-shadowing effects on the emergency cooling pond.
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Conclusions J
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The Regulatory staff stated the applicant's proposed analysis of the Midland Emergency Cooling Pond provided an acceptable basis with respect to Regu-latory Guide 1.27.
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arfginal Signed by Leon B. Engle, Project Manager Light Water Reactors Branch 2-3 j
Directorate of Licensing i
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i MEETING WITH CONSUMERS POWER COMPANY MIDLAND PLAtlT, UNITS 1 AtlD 2 HELD AUGUST 28, 1974 i
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LIST OF ATTENDEES Atomic Energy Comission R. Codell T. Johnson J. Fairobent D. Schreiber I
L. Engle W. Bivins Consumers PowerCompany R. Teuteberg R. Bauman Bechtel Associates i
F. Wind 1
T. Vanvick J. Hurley 1
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MIDLAND PLANT, UNITS 1 AND 2 MEETING
SUMMARY
DISTRIBUTION:
Jockets (2)
LPDR LWR 2-3 Reading L Reading AGiambusso RSBoyd SVarga DEisenhut RKlecker RP ads RP. BCs FSchroeder TR ads TR BCs R0 (3)
RS (3)
OGC FMiraglia, EP-3 LEngle, LWR 2-3 EGoulbourne, LWR 2-3 RCodell TJohnson JFairobent DSchreiber WBivins a
9 og 9
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