1. NAME AND TITLE

SAMSY: A One-Dimensional Multilayer Multigroup Neutron Removal-Diffusion and Gamma-Ray Point Kernel Calculator.

2. CONTRIBUTOR

Institute of Nuclear Research, Reactor Engineering Department, Warsaw, Poland.

3. CODING LANGUAGE AND COMPUTER

FORTRAN IV; CDC CYBER-73

4. NATURE OF PROBLEM SOLVED

SAMSY determines the neutron and gamma-ray fields in a multilayered medium. It provides information on spatial distribution of energy-dependent neutron fluxes and dose rates, primary and secondary inelastic scattering and capture gamma-ray dose rates, and heat deposition. The program is designed to solve a range of shielding problems in one-dimensional plane, cylindrical, and spherical geometries.

5. METHOD OF SOLUTION

The removal-diffusion Spinney method is applied for the calculation of neutron fluxes. The gamma-ray dose rate and/or heat deposition is the product of uncollided flux, absorption coefficient, and buildup factor. There are two optional approaches to the buildup factor evaluation: the first is based on the single-layer buildup factor concept as in the MAC-RAD code, and the second is based on the modified Harima-Nishiwaki formula for buildup factors in multilayered media.

The program uses its own RUSLIB group constants for 26 neutron and 7 gamma-ray groups (including buildup factor data) for 32 elements.

6. RESTRICTIONS OR LIMITATIONS

Provisions are made for 10 different material mixtures and up to 25 shielding regions with up to 50 mesh points in each region.

7. TYPICAL RUNNING TIME

The estimated running time for the sample problem is 208 seconds on the CDC CYBER-73.

8. COMPUTER HARDWARE REQUIREMENTS

The code was designed to run on the CDC CYBER-73. It uses a minimum of 127.5 K octal words and Standard I/O.

9. COMPUTER SOFTWARE REQUIREMENTS

The code is operable on the Scope 3.4.4 Operating System using a FORTRAN IV compiler and the OVERLAY feature.

10. REFERENCES

L. Szymendera, K. Wincel, I. Sobolewska, D. Kordyasz, and A. Polanski, "SAMSY, A One-Dimensional Improved Shielding Code--User's Manual," INR 1691 (1977).

K. Wincel, L. Szymendera, and I. Sobolewska, "Some Practical Application of Gamma-Ray Build-Up Factors for Multilayered Media," INR 1690 (1977).

I. Sobolewska, L. Szymendera, and K. Wincel, "A Modified Harima-Nishiwaki Formula for Gamma-Ray Build-Up Factors in Multilayered Media," INR 1689 (1977).

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

December 1981.