1. NAME AND TITLE

KENO-IV(RG): A Random Geometry Model Version of the KENO-IV Monte Carlo Criticality Code System.

DATA LIBRARY

HRLIB: Hansen-Roach Cross Section Library.

2. CONTRIBUTORS

University of Oklahoma, Norman, Oklahoma.

National Tsing-Hua University, Hsinchu, Taiwan, Republic of China.

3. CODING LANGUAGE AND COMPUTER

Fortran IV and Assembler; FACOM M280.

4. NATURE OF PROBLEM SOLVED.

KENO-IV(RG) is an extension of KENO-IV to allow random geometry (RG) descriptions of materials in the geometry model. This version can be used in the case where the geometry of materials is too complex, such as in the case of dumped Raschig rings, for description using ordinary mathematical models. KENO-IV solves nuclear criticality eigenvalue problems. The results calculated by KENO-IV include k-effective, lifetime and generation time, energy-dependent leakages and absorptions, energy- and region-dependent fluxes and region-dependent fission densities. Criticality searches can be made on unit dimensions or on the number of units in an array.

5. METHOD OF SOLUTION

KENO-IV(RG) solves the Boltzman neutron transport equation using Monte Carlo methods. In the random geometry model, the material thickness of solution or ring along the neutron path is randomly chosen from its predetermined material thickness distribution function, simulating the random orientation or Raschig rings in the solution. These distributions have been obtained experimentally and verified by "mathematical tests."

6. RESTRICTIONS OR LIMITATIONS

The number of solution thicknesses and dumped material thicknesses are each limited to 100.

7. TYPICAL RUNNING TIME

Running times are highly problem dependent on the complexity of the geometry, the number of energy groups, and the type of materials in the problem.

8. COMPUTER HARDWARE REQUIREMENTS

FACOM M280. The code was developed on an IBM-370/158.

9. COMPUTER SOFTWARE REQUIREMENTS

Fortran IV and Assembler.

10. REFERENCES

a. Included in the documentation:

S. Teng and D. Lindstrom, "KENO-IV(RG) USER'S MANUAL SUPPLEMENT TO KENO-IV MANUAL: ORNL-4938," OU-AMNE-78-7 (October 1978).

L. M. Petrie and N. F. Cross, "KENO IV - An Improved Monte Carlo Criticality Program," ORNL-4938 (November 1975).

b. Background information:

G. E. Whitesides and N. F. Cross, "KENO - A Multigroup Monte Carlo Criticality Program," CTC-5 (1969).

11. CONTENTS OF CODE PACKAGE

Included are the referenced documents (10.a) and one (1.2MB) DOS diskette which contains the source code, data library, sample problem input and output.

12. DATE OF ABSTRACT

June 1987.