1. NAME AND TITLE

FITOCO: Converter of Fine-Group Flux Density and Cross Section Data to Coarse Group Values.

2. CONTRIBUTOR

Netherlands Energy Research Foundation ECN, Petten, The Netherlands.

3. CODING LANGUAGE AND COMPUTER

Fortran IV EXTENDED; CDC-CYBER 175.

4. NATURE OF PROBLEM SOLVED

FITOCO converts neutron spectrum data and group cross section data from a fine-group structure into a coarser group structure. This is often used in neutron activation spectrometry when unfolding procedures are applied.

The effective coarse group cross section values for a cross section of a material inside a detector cover (i.e., 10B or Cd) can also be calculated.

5. METHOD OF SOLUTION

FITOCO requires as input a representation of the weighting spectrum and a neutron cross section library, both in the fine group structure of the CCC-112/SAND-II type. The output group structure is determined by the program's input cards.

6. RESTRICTIONS OR LIMITATIONS

The execution of FITOCO requires a binary cross section library. This binary library is created by another code system, e.g., PSR-188/ENTOSAN which is used for ENDF/B libraries or CSTAPE which is part of CCC-112/SAND-II.

7. TYPICAL RUNNING TIME

A sample problem with 36 reactions required 3.3 sec on a CDC CYBER 175 computer.

8. COMPUTER HARDWARE REQUIREMENTS

FITOCO is operable on a CDC CYBER 175 computer using a NOS/BE operating system.

9. COMPUTER SOFTWARE REQUIREMENTS

A Fortran IV EXTENDED compiler and access to a binary fine group library are required.

10. REFERENCE

H. Ch. Rieffe, "FITOCO--A Program for the Conversion of Fine Group Flux Density and Cross Section Data to Coarse Group Values," ECN-92 (April 1981).

11. CONTENTS OF CODE PACKAGE

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

12. DATE OF ABSTRACT

July 1982; revised October 1983; reviewed May 1984.