**1. NAME AND TITLE**

DDXCODES: One-, Two- and Three-Dimensional Transport Codes Using Multigroup Double-Differential Form Cross Sections

**AUXILIARY ROUTINES**

MCFILEF: A pre-processor code which produces a control file for input to SPINPTF.

SPINPTF: A pre-processor which prepares an input file for PROF-DD.

PROF-DD: A code system to generate multigroup double-differential form cross sections (DDX) by processing basic nuclear data file in ENDF/B-IV or ENDF/B-V format.

DDXLIBMK: A program which reads the DDX data library and edits it for input to the transport codes.

ANISN-DD: A one-dimensional discrete ordinates transport code.

REACT: A program to calculate reaction rates from ANISN-DD output.

MONTA: A program which calculates the angular transfer probability for input to ANISN-DD.

MORSE-DD: A three-dimensional Monte Carlo transport code.

**DATA LIBRARY**

DDXLIB: Double-differential cross section library, available as RSIC package DLC-123.

**2. CONTRIBUTORS**

Japan Atomic Energy Research Institute, Ibaraki-ken, Japan.

**3. CODING LANGUAGE AND COMPUTER**

FORTRAN 77; FACOM M-380.

**4. NATURE OF PROBLEM SOLVED**

The DDXCODES were written to accurately predict the transport of neutrons by using the multigroup double-differential form cross sections. These types of cross sections can correctly take into account the energy-angle correlated reaction kinematics. Hence, the transport phenomenon in materials with highly anisotropic scattering is accurately calculated.

**5. METHOD OF SOLUTION**

The MCFILEF code prepares a control file for input to SPINPTF. SPINPTF then prepares input for PROF-DD by combining the control file and other input data. The PROF-DD code calculates the multigroup cross sections and angle-energy distributions (DDX). The program DDXLIBMK then reads the DDX formatted library and edits it into a specified format for input to ANISN-DD or MORSE-DD.

**6. RESTRICTIONS OR LIMITATIONS**

None noted.

**7. TYPICAL RUNNING TIME**

None noted.

**8. COMPUTER HARDWARE REQUIREMENTS**

DDXCODES will run on the FACOM M-380. With minor modifications, the codes can be modified to run on the IBM mainframes.

**9. COMPUTER SOFTWARE REQUIREMENTS**

DDXCODES are written in FORTRAN 77.

**10. REFERENCES**

**a. Included in the package:**

T. Mori, M. Nakagawa, M. Sasaki. *One-, Two-, Three-Dimensional Transport Codes
Using Multigroup Double-Differential Form Cross Sections*, JAERI 1314, Ibaraki-ken,
Japan, (November 1988).

M. Nakagawa, and T. Mori. *MORSE-DD: A Monte Carlo Code Using Double
Differential Form Cross Sections*, JAERI-M 84-126, JAERI, Ibaraki-ken, Japan, (July 1984).

**11. CONTENTS OF CODE PACKAGE**

Included are the referenced documents and one DS/HD 5.25-inch diskette (1.2 MB), containing the FORTRAN 77 sources and sample problem.

**12. DATE OF ABSTRACT**

February 1991.

**KEYWORDS:** COMPLEX GEOMETRY; DISCRETE ORDINATES; GAMMA-RAY;
MONTE CARLO; MULTIGROUP; NEUTRON; ONE-DIMENSION;
TWO-DIMENSIONS