RSICC CODE PACKAGE PSR-390

1. NAME AND TITLE

UHS: Ultimate Heat Sink Cooling Pond and Spray Pond Analysis Models.

2. CONTRIBUTORS

US Nuclear Regulatory Commission, Washington, D.C. through the Energy Science and Technology Software Center, Oak Ridge, Tennessee.

3. CODING LANGUAGE AND COMPUTER

FORTRAN77; IBM PS/2; (P00390IPS7000).

4. NATURE OF PROBLEM SOLVED

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.

5. 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.

6. RESTRICTIONS OR LIMITATIONS

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 tools 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.

7. TYPICAL RUNNING TIME

Running times are user dependent and some interactive performance is required.

8. COMPUTER HARDWARE REQUIREMENTS

PC 386 or better, VGA Monitor.

9. COMPUTER SOFTWARE REQUIREMENTS

PC: DOS 4.0 or better.

10. 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).

11. CONTENTS OF CODE PACKAGE

Included are the reference documents, and one diskette with source code, sample problem input and output in a self-extracting compressed DOS file.

12. DATE OF ABSTRACT

February 1999.

KEYWORDS: EVAPORATION; HEAT TRANSFER