1. NAME AND TITLE

FURNACE: Code System for Neutronic Calculations in Three Dimensional Toroidal Geometry.

2. CONTRIBUTOR

Stichting Energieonderzoek Centrum, Petten, Netherlands through the NEA Data Bank, Gif-sur-Yvette, France.

3. CODING LANGUAGE AND COMPUTER

Fortran IV; CDC CYBER 740

4. NATURE OF PROBLEM SOLVED

The FURNACE program system performs neutronic and photonic calculations in three dimensional toroidal geometry for application to fusion reactors. The geometry description is quite general, allowing any torus cross section and any neutron source density distribution for the plasma, as well as simple parametric representations of circular, elliptic and D-shaped tori and plasmas. The numerical method is based on an approximate transport model that produces results with sufficient accuracy for reactor-design purposes, at acceptable calculational costs. The report gives a short description of the numerical method, and a user manual for the programs of the system: FURNACE, ANISN-PT, LIBRA, TAPEMA and DRAWER.

5. METHOD OF SOLUTION

The unscattered angular fluxes inside the vessel are calculated with a ray-tracing method, then the scattered angular fluxes inside the vessel are calculated with an albedo method applying double differential albedos, and finally the scalar flux distributions in the surrounding blankets are calculated by integrating over radial flux kernels. The numerical calculations are performed in a poloidal toroidal mesh for a sector of the torus. The double differential albedos and flux kernels required are calculated with a special version of the ANISN program.

6. RESTRICTIONS OR LIMITATIONS

7. TYPICAL RUNNING TIME

NEA-DB executed the test case included in this package on a CDC CYBER 740 computer. The following CPU times were required to run the different modules: 306 seconds (LIB); 9 seconds (TAPEMA); 1074 seconds (ANISNPT1); 1028 seconds (ANISNPT2); 4 seconds (LIBRA); 1750 seconds (FURNACE).

8. COMPUTER HARDWARE REQUIREMENTS

To run the test case included in this package on a CDC CYBER 740 computer, main storage requirements for the different modules are as follows: 126,100 (octal) words (LIB); 271,500 (octal) words (TAPEMA); 206,200 (octal) words (ANISNPT1); 207,962 (octal) words (ANISNPT2); 123,600 (octal) words (LIBRA); 320,000 (octal) words (FURNACE).

9. COMPUTER SOFTWARE REQUIREMENTS

FURNACE is written in FORTRAN-IV and runs under the NOS 1.4-531 operating system.

10. REFERENCE

K. A. Verschuur, "FURNACE: A Toroidal Geometry Neutronic Program System Method Description and Users Manual," ECN-85-165 (October 1985).

11. CONTENTS OF CODE PACKAGE

Included are the referenced document and 1 DS/HD (1.2MB) diskette which includes source codes, sample input and output in compressed mode for DOS.

12. DATE OF ABSTRACT

April 1993.