1. NAME AND TITLE

MORSE-ALB: Monte Carlo Multigroup Neutron and Gamma-Ray Transport Code System, Albedo Version. We recommend C00474/ALLCP/02 MORSE-CGA.

2. CONTRIBUTORS

Naig Nuclear Research Laboratory, Nippon Atomic Industry Group Co., Ltd., Kawasaki, Japan, Toshiba Corporation, Tokyo, Japan,

Power Reactor and Nuclear Fuel Development Corporation, Ibaraki-ken, Japan,

through the

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

3. CODING LANGUAGE AND COMPUTER

Fortran IV and Assembler language; TOSBAC5600 and FACOM M200.

4. NATURE OF PROBLEM SOLVED

MORSE-ALB is an S_n-Monte Carlo-S_n (adjoint) coupling method for efficiently evaluating bulk shielding properties considering both the shielding transmission component and the streaming component for various reactor systems having many penetrations.

5. METHOD OF SOLUTION

MORSE-ALB considers penetrations and perturbations in relation to the total shielding. The transmission calculations of the entire shielding which can be described two-dimensionally are based on the two-dimensional S_n method, and streaming calculations through the penetrations section which assume complex geometry are accomplished by the albedo Monte Carlo method, producing shielding values. The shielding values which should be determined are calculated following combination of the neutron flux achieved by the aforementioned method and the adjoint neutron flux achieved by S_n transport calculations on the system around the detector at the outlet of the penetrations, followed by spatial channel theoretical expression.

6. RESTRICTIONS OR LIMITATIONS

MORSE-ALB lacks flexibility along the coupling surfaces. It cannot handle adjoint transport calculations in a three-dimensional system. It has a tendency toward underevaluation.

7. TYPICAL RUNNING TIME

CPU time for a conventional iron shielding system was 41.85 min. CPU time for an iron shielding system with the density increased four-fold was 335.91 min.

8. COMPUTER HARDWARE REQUIREMENTS

MORSE-ALB is operable on the TOSBAC5600 and the FACOM M200 computers. The TOSBAC5600 is used for Files 1 and 2 and the FACOM M200 is used for Files 3-6.

9. COMPUTER SOFTWARE REQUIREMENTS

Fortran IV and Assembler language compilers are required.

10. REFERENCES

M. Kawai, Y. Hayashida, and M. Nakai, "Improvement of Streaming Analysis Technique with Monte Carlo Method-II," JAPFNR-545, ORNL-tr-4729 (February 1980).

M. Kawai, Y. Hayashida, M. Uematsu, and J. Itoh, "Development of Albedo-Sn Transport Code DOT-ALB and its Application to Shielding Calculation," NAIG Annual Review (1982) 11-14.

M. Kawai, Y. Hayashida, M. Yamauchi, M. Uematsu, and J. Niidome, "Analysis of JOYO Shielding Experimental Data by Albedo Monte Carlo Method," NAIG Annual Review (1982) 15-19.

11. CONTENTS OF CODE PACKAGE

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

12. DATE OF ABSTRACT

March 1984.

KEYWORDS: MONTE CARLO; NEUTRON; MULTIGROUP; ADJOINT; GAMMA-RAY