**1. NAME AND TITLE**

RADHEAT-V4: A Code System To Generate Multigroup Constants and Analyze Radiation Transport For Shielding Safety Evaluation.

**AUXILIARY ROUTINES**

FAIR-CROSS: A Program which generates coupled neutron and gamma- ray cross sections for multigroup transport calculations.

TWOWAY: A program which converts secondary gamma-ray production to the arbitrary neutron and gamma-ray energy group structure for coupled neutron-gamma transport calculations

FDEM: A program which generates cell-averaged few-group cross sections and collapsed response functions.

DIAC: A one-dimensional discrete ordinates transport code.

ESPRIT: A two-dimensional discrete ordinates transport code.

MCACE: A three-dimensional Monte Carlo transport code.

BREM: A program which computes secondary gamma-ray production by the Bremsstrahlung effect.

**2. CONTRIBUTOR**

Japan Atomic Energy Research Institute, Tokai-Mura, Ibaraki-Ken, Japan through the NEA Computer Programme Library, Ispra (Varese), Italy.

**3. CODING LANGUAGE AND COMPUTER**

FORTRAN 77; FACOM M-380.

**4. NATURE OF PROBLEM SOLVED**

RADHEAT-V4 is a modular code system for analyzing the neutron and gamma-ray transport and calculating the energy deposition and atomic displacements due to these radiation effects in a nuclear reactor or shield. Multigroup cross sections for neutrons and photons are generated by using the evaluated nuclear data ENDF/B, JENDL and DLC-15 (Storm-Israel photon interaction data).

**5. METHOD OF SOLUTION**

A pointwise processing technique and the Bondarenko type resonance self-shielding factors are adopted to generate multigroup cross sections. One- and two-dimensional discrete ordinates transport methods and three-dimensional Monte Carlo method are used for the shielding calculation.

**6. RESTRICTIONS OR LIMITATIONS**

The maximum numbers of neutron and photon fine-group are 200 and 50, respectively. The maximum number of angular meshes in the macroscopic cross section is 64. The energy ranges from .0000261eV to 16.74MeV for neutron and 1Kev to 20 MeV for photon.

**7. TYPICAL RUNNING TIME**

For the FAIR-CROSS code, step 1 took about 3 minutes; step2 took 2 minutes; step 3 took 5 seconds. TWOWAY took about 1 minute. FDEM took about 10 seconds. BREM took 20 seconds. DIAC took 20 seconds. ESPRIT took 2 minutes. The cases were run on the FACOM M-380 at JAERI.

**8. COMPUTER HARDWARE REQUIREMENTS**

The code will operate on the FACOM M-380.

**9. COMPUTER SOFTWARE REQUIREMENTS**

The code requires a FORTRAN 77 compiler and an Assembler compiler. The compiler used at JAERI is the FACOM MST.

**10. REFERENCE**

N. Yamano, K. Minami, K. Koyama, Y. Naito. *RADHEAT-V4: A Code System to
Generate Constants and Analyze Radiation Transport for Shielding Safety Evaluations*,
JAERI-1316, Japan Atomic Energy Research Institute, Ibaraki-ken, Japan, March 1989.

**11. CONTENTS OF CODE PACKAGE**

Included are the referenced document and 2 DS/HD 5.25-inch diskettes (1.2 MB) which contain the source code and sample problem input and output.

**12. DATE OF ABSTRACT**

December 1981; February 1991.

**KEYWORDS: ** CROSS SECTION PROCESSING; DISCRETE ORDINATES;
ENERGY DEPOSITION; GAMMA-RAY; MODULAR
SYSTEM; MULTIGROUP; NEUTRON; ONE-DIMENSION;
RADIATION DAMAGE