1. NAME AND TITLE
RICM: Resonance Absorption in Multi-Region Slab or Square or Hexagonal Lattice.
2. CONTRIBUTOR
Japan
Atomic Energy Research Institute through the OECD Nuclear Energy Agency Data
Bank, Issy-les-Moulineaux, France.
3. CODING LANGUAGE AND COMPUTER
Fortran, IBM 360 Series (P00600I036000).
4. NATURE OF PROBLEM SOLVED
RICM calculates the resonance absorption integral of resonant isotope in a multi-region lattice using the first flight collision probability. The lattice configurations considered are a slab lattice, a square or hexagonal lattice and a cylindricalized lattice with isotropic or perfect reflecting boundary condition. Cases for an isolated rod or plate and homogeneous system can also be treated.
5. METHOD OF SOLUTION
Slowing down of neutrons by each isotope in each region is solved by either exact numerical integration of the slowing down equation or narrow - or wide-resonance approximation. Breit-Wigner's single level formula is used for the resonance cross section and Porter-Thomas distribution of neutron width is taken into account in the unresolved region.
6. RESTRICTIONS OR LIMITATIONS
Maximum number of regions 5; Maximum number of groups 100.
7. TYPICAL RUNNING TIME
For the calculation of 3 regions 54 groups - about 3.2 minutes on IBM 360/65.
8. COMPUTER HARDWARE REQUIREMENTS
IBM 360 /65 (32k words 2 library tape units.)
9. COMPUTER SOFTWARE REQUIREMENTS
IBM 3760 Operating System.
10. REFERENCES
a) Included Documentation:
H. Mizuta, K. Aoyama, Y.Fukai, “RICM - An IBM 7090 Code of Resonance Integral Calculation for Multi-Region,” JAERI-1134 (1967).
11. CONTENTS OF CODE PACKAGE
The package is distributed on a CD with a compressed zip file including source files, documentation, sample input and output.
12. DATE OF ABSTRACT
December 2013.
KEYWORDS: BREIT-WIGNER FORMULA, COLLISIONS, PORTER-THOMAS DISTRIBUTION, PROBABILITY, REACTOR LATTICES, REASONANCE ABSORPTION, SLOWING