**1. NAME AND TITLE**

FIGERO: Processing Codes for Generating Multigroup Neutron Cross Sections from
ENDF/B for Use in Discrete Ordinates Calculations.

**AUXILIARY ROUTINES**

RESEND: Code for Processing ENDF/B Resonance Data.

INSCAT: Code for Calculating Group-to-Group Scattering Matrices for the Discrete and
Continuum Inelastic Data and (n,2n) Reaction Data.

**2. CONTRIBUTOR**

Experimental Reactor Physics Section, Bahabha Atomic Research Center, Trombay, Bombay,
India.

**3. CODING LANGUAGE AND COMPUTER**

Fortran IV; CDC.

**4. NATURE OF PROBLEM SOLVED**

FIGERO generates multigroup cross sections for an arbitrary group structure extending up to 15 MeV for neutronics studies. It also calculates the average number of neutrons released per fission.

RESEND calculates fission, capture and scattering cross sections in the resonance energy region.

INSCAT calculates group-to-group scattering matrices for the discrete level, continuum, and (n,2n)
scattering data.

**5. METHOD OF SOLUTION**

FIGERO makes use of the basic cross-section data from the ENDF/B library to obtain the multigroup cross sections. It uses 1/E, E or constant as flux weighting factors. The integrals used in the group averaging are analytically solved by taking into account the appropriate cross-section interpolation schemes.

RESEND generates energy-point cross-section data by making use of the resonance parameter data from ENDF/B library and combining the background cross sections listed in ENDF/B file 3.

INSCAT uses discrete level and statistical evaporation models and makes use of the energy point
data from file 3 of the ENDF/B library. The integrals involved are analytically solved.

**6. RESTRICTIONS OR LIMITATIONS**

FIGERO can accept up to 8000 energy-point data for each type of reaction. There is no limit on
the number of energy-point cross-section data generated by RESEND using the resolved and
unresolved resonance parameters.

**7. TYPICAL RUNNING TIME**

FIGERO runs in about 5 minutes using 8000 energy point cross-section data for each reaction and
17 energy groups. INSCAT takes about 5 minutes using 30 discrete states and 27 groups.

**8. COMPUTER HARDWARE REQUIREMENTS**

This version is operable on the CDC computers. FIGERO requires 58 K words of memory on a
CDC 3600 computer. INSCAT needs 32 K words of memory and one tape drive to read cross-section
data from an ENDF/B tape. RESEND has been split into two overlays to operate on the CDC 3600
computer.

**9. COMPUTER SOFTWARE REQUIREMENTS**

A Fortran IV compiler is required.

**10. REFERENCES**

S. B. Garg, "Programme FIGERO," Informal note.

S. B. Garg, "Programme INSCAT," Informal note.

S. B. Garg, "Programme RESEND," Informal note.

S. B. Garg, "Transmittal of the FIGERO Code Package," Informal note (October 1978).

**11. CONTENTS OF CODE PACKAGE**

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

**12. DATE OF ABSTRACT**

April 1984.

**KEYWORDS**: MULTIGROUP CROSS SECTION PROCESSING; NEUTRON CROSS
SECTION PROCESSING; ENDF FORMAT; ANISN FORMAT