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ESTS0404 UHS.

UHS, Ultimate Heat Sink Cooling Pond Analysis

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1. NAME OR DESIGNATION OF PROGRAM:  UHS.
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2. COMPUTERS
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Program name Package id Status Status date
UHS ESTS0404/01 Arrived 16-JAN-2002

Machines used:

Package ID Orig. computer Test computer
ESTS0404/01 IBM PC
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3. DESCRIPTION OF PROGRAM OR FUNCTION

Three programs model performance of an ultimate heat sink cooling pond. National Weather  Service data is read and analyzed to predict periods of lowest cooling performance and highest evaporative loss. The data is compared to local site data for significant differences. Then the maximum pond temperature is predicted. Five programs model performance of an ultimate heat sink spray pond. The cooling performance, evaporative water loss, and drift water loss as a function of windspeed are estimated for a spray field. These estimates are used in conjunction with National Weather Service data to predict periods of lowest cooling performance and highest evaporative loss. This data is compared to local site data for significant differences. Then the maximum pond temperature is predicted.
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4. METHOD OF SOLUTION

The transfer of heat and water vapor is modeled using an equilibrium temperature procedure for an UHS cooling pond.  The UHS spray pond model considers heat, mass, and momentum transfer from a single water drop with the surrounding air, and modification  of the surrounding air resulting from the heat, mass, and momentum transfer from many drops in different parts of a spray field.
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5. RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM

The program SPRCO uses RANF, a uniform random number generator which is an intrinsic function on the CDC. All programs except COMET use the NAMELIST statement, which is non standard. Otherwise these programs conform to the ANSI Fortran 77 standard. The meteorological data scanning procedure requires tens of years of recorded data to be effective. The models and methods, provided as useful tool for UHS analyses of  cooling ponds and spray ponds, are intended as guidelines only. Use  of these methods does not automatically assure NRC approval, nor are they required procedures for nuclear-power-plant licensing.
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6. TYPICAL RUNNING TIME

The meteorological scanning programs required 80-90 CP seconds on a CRAY X-MP/216 to process 35-40 years of hourly weather observations. The spray pond performance model required 40-70 CP seconds for the sample problems published in the NUREG report. All other programs required less than 10 CP seconds.
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7. UNUSUAL FEATURES OF THE PROGRAM

The ultimate calculations of these two packages rely on having available hourly meteorological data for 20 or more years.
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8. RELATED OR AUXILIARY PROGRAMS: RELATED AND AUXILIARY PROGRAMS
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9. STATUS
Package ID Status date Status
ESTS0404/01 16-JAN-2002 Masterfiled Arrived
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10. REFERENCES
ESTS0404/01, included references:
- R. Codell and W.K. Nuttle:
  Analysis of Ultimate Heat Sink Cooling Ponds
  NUREG-0693 (November 1980)
- R. Codell:
  Analysis of Ultimate-Heat-Sink Spray Ponds
  NUREG-0733 (August 1981)
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11. HARDWARE REQUIREMENTS: MACHINE REQUIREMENTS
ESTS0404/01
IBM PS/2.
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12. PROGRAMMING LANGUAGE(S) USED
Package ID Computer language
ESTS0404/01 FORTRAN
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13. SOFTWARE REQUIREMENTS: OPERATING SYSTEM UNDER WHICH PROGRAM IS EXECUTED
ESTS0404/01
DOS 4.0
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14. OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS

National Weather Service tapes of Tape Data Family (TDF-14) are used by the model as a source of temperature, windspeed, and cloud-over observations. These tapes are available for major observations points throughout the United States.
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15. NAME AND ESTABLISHMENT OF AUTHORS

     R. Codell and W.K. Nuttle
     US Nuclear Regulatory Commission, Washington D.C., U. S. A.
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16. MATERIAL AVAILABLE
ESTS0404/01
COMET Directory: Compares limited quantity of onsite meteorological data
COMET2 Directory: Compares limited quantity of onsite meteorological data
DRIFT Directory: Calculates a table of drift water loss vs windspeed for spray pond
SPRCO Dir: Simulates high- & low-windspeed versions of spray-pond-cooling model
SPSCAN Scans weather-record tape to predict cooling performance & evap. water loss
SPRND Dir:Calculates most pessimistic cooling-pond temp. for a design-base accident
UHS3 Dir: Calculates most pessimistic cooling-pond temp. using hydraulic models
ULTSNK Dir:
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17. CATEGORIES
  • H. Heat Transfer and Fluid Flow

Keywords: cooling, cooling load, evaporative cooling, heat transfer, reactor cooling systems.