1. NAME AND TITLE

SCORE-4: Two-Dimensional Multigroup Removal-Diffusion Shielding Code System.

AUXILIARY ROUTINE

BCDBIN: BCD to Binary Converter.

TAPEMAKER: Data Processor.

2. CONTRIBUTOR

United Kingdom Atomic Energy Authority, Risley, Lancashire, England, through the OECD NEA Data Bank, Gif-sur-Yvette, France.

3. CODING LANGUAGE AND COMPUTER

FORTRAN IV and Assembler language; IBM 360/370.

4. NATURE OF PROBLEM SOLVED

SCORE-4 is a two-dimensional removal diffusion code system which allows the use of inset boundary conditions and will optionally calculate the mesh interval requirements of each shield region. A calculation including both the radial and top shields of a fast reactor can be carried out. The neutron flux is calculated for a shield made up of rectangular regions. The geometry is either X-Y or R-Z.

5. METHOD OF SOLUTION

Removal fluxes and sources throughout the shield regions are calculated from a given reactor core power distribution using a point kernel method. The diffusion neutron fluxes are obtained from the removal source distribution using an iterative method of solution.

6. RESTRICTIONS OR LIMITATIONS

The amount of fast core required for the program depends on the size of shield being calculated. For example, a 100 by 100 mesh shielding calculation would require approximately 300 k bytes. Larger problems could be solved by increasing the fast storage requirements.

Up to 500 experimental data points with their associated error bars can be displayed. Up to 2 smooth curves may be overlayed on a display of experimental data points. Each curve is restricted to 150 points.

7. TYPICAL RUNNING TIME

Approximately 2 hours is required on the IBM 370/165 for a whole shield calculation.

8. COMPUTER HARDWARE REQUIREMENTS

SCORE-4 was developed for ICL 4/70 and IBM 360 computers and is operable on IBM 370/165 computers. A 100 by 100 mesh shielding calculation requires approximately 300 k bytes.

9. COMPUTER SOFTWARE REQUIREMENTS

FORTRAN IV and Assembler language compilers are required.

10. REFERENCE

B. L. Richardson, "A Multigroup Removal Diffusion Theory Shielding Code for X-Y and R-Z Geometries with Inset Boundaries," Informal document.

11. CONTENTS OF CODE PACKAGE

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

12. DATE OF ABSTRACT

August 1975; updated January 1983; revised December 1983.