1. NAME AND TITLE

HORN: A Computer Code To Analyze The Gas-Phase Transport Of Fission Products In Reactor Cooling System Under Severe Accidents.

2. CONTRIBUTOR

Japan Atomic Energy Research Institute, through NEA Data Bank, Gif-sur-Yvette Cedex, France.

3. CODING LANGUAGE AND COMPUTER

Fortran 77; IBM 3083.

4. NATURE OF PROBLEM SOLVED

HORN calculates the transport of volatile fission products in a dry primary cooling circuit under severe accidents of water reactors.

5. METHOD OF SOLUTION

HORN determines the chemical forms of fission products both in the bulk flow and at the wall by the gas-liquid-solid equilibrium model. The results are used to calculate the diffusional deposition rates of vapors and to estimate the nucleation rates of aerosols. The number of fission product elements is minimized by using the periodicity of elements and by treating less volatile elements collectively as one imaginary element which always behaves like an aerosol.

6. RESTRICTIONS OR LIMITATIONS

The elements considered are H, O, B, Kr, Xe, Cs, I, Te, Sb, Ag, Cd, and Ba.

7. TYPICAL RUNNING TIME

The sample input was tested on the IBM 3083 at NEA Data Bank. It took 205 seconds.

8. COMPUTER HARDWARE REQUIREMENTS

HORN runs on the IBM 3083.

9. COMPUTER SOFTWARE REQUIREMENTS

The code was written in Fortran 77. On the IBM 3083, the compiler used was VS Fortran Level 2.3.0.

10. REFERENCE

M. Uchida and H. Saito, "HORN: A Computer Code To Analyze the Gas-Phase Transport Of Fission Products In Reactor Cooling System Under Severe Accidents," JAERI-M 86-158 (October 7, 1986).

11. CONTENTS OF CODE PACKAGE

Included are the referenced document and one DS/DD (360 K) 5.25 inch diskette.

12. DATE OF ABSTRACT

December 1990.