RSICC CODE PACKAGE PSR-413

1. NAME AND TITLE

SFHA: Spent Fuel Heating Analysis.

2. CONTRIBUTORS

Lawrence Livermore National Laboratory, Livermore, California, through the Energy Science and Technology Software Center, Oak Ridge, Tennessee.

3. CODING LANGUAGE AND COMPUTER

BASIC; IBM PC (P00413IBMPC00).

4. NATURE OF PROBLEM SOLVED

SFHA calculates steady-state fuel rod temperatures for hexagon and square-fuel bundles. The code is used to perform sensitivity studies and confirmatory analyses of results submitted by applicants for spent fuel storage licenses. All three modes of heat transfer are considered; radiation, convection, and conduction. Each is modeled separately. SFHA benchmark calculations were made with test data to validate the use of a simple one-dimensional heat transfer model for estimating fuel rod temperatures. Benchmark results show that SFHA is capable of calculating spent fuel rod temperatures for square and hexagonal fuel bundles under various environments for the consolidated or unconsolidated condition. The program is menu-driven and executes automatically after all required information is entered.

5. METHOD OF SOLUTION

SFHA uses simplified one-dimensional models. The fuel rod temperatures for unspecified heat fluxes and rod configurations for consolidated and unconsolidated fuel bundles are calculated using an iterative type of solution. SFHA is based on the use of concentric tube models for radiative and conductive heat transfer. The calculational method is an adaptation of the Wooten-Epstein Correlation (WEC), a simplified radiative heat transfer model which replaces the fuel rod rows with equivalent concentric tubes. It expands the WEC to include other fuel assembly geometries and a heat conduction term for analyzing, in particular, consolidated fuel bundles.

6. RESTRICTIONS OR LIMITATIONS

SFHA is limited to analysis of symmetrical geometries and temperature distributions. When convective heat transfer is used, the heat transfer coefficient and exponent must be empirically established from test data. The code assumes that the basket and fuel rod emissivities are identical.

7. TYPICAL RUNNING TIME

Not noted.

8. COMPUTER HARDWARE REQUIREMENTS

A color monitor and IBM PC are required.

9. COMPUTER SOFTWARE REQUIREMENTS

SFHA was developed under DOS 2.1. A BASIC interpreter is required to execute the program. No executable is included in the package.

10. REFERENCE

L. E. Fischer, "Spent Fuel Heating Analysis (SFHA) Code," UCID-21711 (May 1989).

11. CONTENTS OF CODE PACKAGE

Included are the referenced document and one DOS formatted diskette with the BASIC source.

12. DATE OF ABSTRACT

May 1999.

KEYWORDS: HEAT TRANSFER; SENSITIVITY ANALYSIS