ESTS0404 UHS.
UHS, Ultimate Heat Sink Cooling Pond Analysis
NAME OR DESIGNATION OF PROGRAM, COMPUTER, DESCRIPTION OF PROGRAM OR FUNCTION, METHOD OF SOLUTION, RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM, TYPICAL RUNNING TIME, UNUSUAL FEATURES OF THE PROGRAM, AUXILIARIES, STATUS, REFERENCES, REQUIREMENTS, LANGUAGE, OPERATING SYSTEM, OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS, NAME AND ESTABLISHMENT OF AUTHORS, MATERIAL, CATEGORIES
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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.
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.
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.
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.
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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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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ESTS0404/01
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ESTS0404/01
COMET Directory: Compares limited quantity of onsite meteorological dataCOMET2 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:
Keywords: cooling, cooling load, evaporative cooling, heat transfer, reactor cooling systems.