NEA-0234 RICM.

RICM, Resonance Absorption in Multi-Region Slab or Square or Hexagonal Lattice

NAME OR DESIGNATION OF PROGRAM, COMPUTER, NATURE OF PHYSICAL PROBLEM SOLVED, METHOD OF SOLUTION, RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM, TYPICAL RUNNING TIME, FEATURES, RELATED AND AUXILIARY PROGRAMS, STATUS, REFERENCES, MACHINE REQUIREMENTS, LANGUAGE, OPERATING SYSTEM OR MONITOR UNDER WHICH PROGRAM IS EXECUTED, ANY OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS, NAME AND ESTABLISHMENT OF AUTHOR, MATERIAL, CATEGORIES

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1. NAME OR DESIGNATION OF PROGRAM: RICM.

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2. COMPUTERS

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Program name	Package id	Status	Status date
RICM	NEA-0234/01	Tested	01-JAN-1968

Machines used:

Package ID	Orig. computer	Test computer
NEA-0234/01	IBM 360 series	IBM 360 series

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3. NATURE OF PHYSICAL PROBLEM SOLVED

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.

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4. 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.

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5. RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM

Maximum number of regions 5.
Maximum number of groups 100.

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6. TYPICAL RUNNING TIME

For the calculation of 3 regions 54 groups - about 3.2 minutes on IBM 360/65.

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7. UNUSUAL FEATURES: UNUSUAL FEATURES OF THE PROGRAM

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8. RELATED AND AUXILIARY PROGRAMS

RICM-FFCP-C-RN-S calculates first flight collision probability in cylindrical and slab geometry. RICM-LTE calculates the value of the Doppler functions for resolved and unresolved level regions and prepares a library tape for RICM.

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9. STATUS

Package ID	Status date	Status
NEA-0234/01	01-JAN-1968	Tested at NEADB

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10. REFERENCES

-H. Mizuta, K. Aoyama, Y.Fukai:
RICM - An IBM 7090 Code of Resonance Integral Calculation for
Multi-Region
JAERI - 1134.

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11. MACHINE REQUIREMENTS: 32k words 2 library tape units.

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12. PROGRAMMING LANGUAGE(S) USED

Package ID	Computer language
NEA-0234/01	FORTRAN-IV

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13. OPERATING SYSTEM OR MONITOR UNDER WHICH PROGRAM IS EXECUTED: IBM 360 OS.

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14. ANY OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS

This version keeps the chain feature in original programme.

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15. NAME AND ESTABLISHMENT OF AUTHOR

     H. Mizuta, K. Aoyama and Y. Fukai                                      Nuclear Code Committee of Japan
     Japan Atomic Energy Research Institute
     Nippon Atomic Industry Group Co. Ltd.

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16. MATERIAL AVAILABLE

NEA-0234/01

File name	File description	Records
NEA0234_01.001	INFORMATION	23
NEA0234_01.002	RICM-FFCP SOURCE & DATA 360/65	2195
NEA0234_01.003	RICM-LTE SOURCE & DATA 360/65	2288
NEA0234_01.004	RICM-MAIN SOURCE & DATA 360/65	2637
NEA0234_01.005	RICM-FFCP PUNCHED OUTPUT	41
NEA0234_01.006	RICM-FFCP PRINTED OUTPUT	125
NEA0234_01.007	RICM-LTE PRINTED OUTPUT	5497
NEA0234_01.008	RICM-MAIN PRINTED OUTPUT	4572

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17. CATEGORIES

B. Spectrum Calculations, Generation of Group Constants and Cell Problems

Keywords: Breit-Wigner formula, collisions, porter-thomas distribution, probability, reactor lattices, resonance absorption, slowing-down.