**1. NAME AND TITLE**

FEMRZ: A Finite-Element Method Two-Dimensional Multigroup Neutron Transport Code System, (r,z) Geometry.

**2. CONTRIBUTOR**

Japan Atomic Energy Research Institute, Tokai, Ibaraki, Japan.

**3. CODING LANGUAGE AND COMPUTER**

Fortran IV; FACOM 230-75.

**4. NATURE OF PROBLEM SOLVED**

FEMRZ is a computer program based on the finite element method which has been developed for solving multi group neutron transport problems in two-dimensional cylindrical (r,z) geometry. It can solve not only eigenvalue problems but also other problems, such as fixed source problems.

**5. METHOD OF SOLUTION**

In the solution algorithm, the method of higher order finite elements is applied to the spatial
variables on rectangular (r,z) subregions. It is based on the discontinuous method with a Galerkin-type
scheme. The discrete ordinate S_{n} method is used for the angular variables.

**6. RESTRICTIONS OR LIMITATIONS**

No restrictions have been noted except for the computer size.

**7. TYPICAL RUNNING TIME**

A three-group, S_{4}, 4 × 3 mesh point, second order approximation, k_{eff} calculation requires about
0.1 minutes of FACOM 230-75 time.

**8. COMPUTER HARDWARE REQUIREMENTS**

FEMRZ is designed to operate on the FACOM 230-75 computer. It requires a minimum of 64 K words.

**9. COMPUTER SOFTWARE REQUIREMENTS**

A variable dimension Fortran IV compiler and a standard FACOM Monitor-VII are required.

**10. REFERENCE**

T. Fujimura, T. Tsutsui, K. Horikami, T. Ohnishi, and Y. Nakahara, "FEMRZ, Program for Solving Two-Dimensional Neutron Transport Problems in Cylindrical Geometry by the Finite Element Method," JAERI 1253 (February 1978).

**11. CONTENTS OF CODE PACKAGE**

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

**12. DATE OF ABSTRACT**

January 1982.

**KEYWORDS:** TWO-DIMENSIONS; CYLINDRICAL GEOMETRY; FINITE ELEMENT
METHOD; MULTIGROUP; DISCRETE ORDINATES; NEUTRON