last modified: 01-JAN-1968 | catalog | categories | new | search |

NEA-0234 RICM.

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

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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.