**1. NAME AND TITLE**

PROB: Multigroup One-Dimensional Transport Code System, Collision Probability Method.

**2. CONTRIBUTOR**

The National Commission of Atomic Energy, Department of Reactors, Buenos Aires, Argentina, through the OECD NEA Data Bank, Gif-sur-Yvette, France.

**3. CODING LANGUAGE AND COMPUTER**

FORTRAN IV; IBM 360/370.

**4. NATURE OF PROBLEM SOLVED**

The transport equation in slab geometry is solved using the multigroup collision probability method.

**5. METHOD OF SOLUTION**

PROB uses successive overrelaxation method.

**6. RESTRICTIONS OR LIMITATIONS**

Available core storage is the only restriction on the size of the problem. Variable dimensioning is used.

**7. TYPICAL RUNNING TIME**

The sample problem required five minutes.

**8. COMPUTER HARDWARE REQUIREMENTS**

An IBM 360/370 computer and at least 70 K core storage are required.

**9. COMPUTER SOFTWARE REQUIREMENTS**

A FORTRAN IV compiler is required.

**10. REFERENCE**

J. M. Fink, "PROB: Code for the Solution of the Transport Equation by the Method of Collision Probabilities in Slab Geometry," CNEA Re-58 (June 1972).

**11. CONTENTS OF CODE PACKAGE**

Included are the referenced document and one (1.2MB) DOS diskette tape which contains the source code and sample problem input and output.

**12. DATE OF ABSTRACT**

June 1978; reviewed March 1982.

**KEYWORDS: ** MULTIGROUP; ONE-DIMENSION; COLLISION PROBABILITY;
NEUTRON; SLAB