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NEA-0414 SQUID-360.

SQUID-360, 2-D Neutron Diffusion in X-Y and R-Z Geometry with Criticality Search and Constant Neutron Source

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1. NAME OR DESIGNATION OF PROGRAM:  SQUID-360.
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2. COMPUTERS
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Program name Package id Status Status date
SQUID-360 NEA-0414/01 Tested 01-DEC-1974

Machines used:

Package ID Orig. computer Test computer
NEA-0414/01 IBM 370 series IBM 370 series
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3. NATURE OF PHYSICAL PROBLEM SOLVED

SQUID is a multigroup diffusion program in x-y and r-z geometry. The possibility to solve the diffusion equations with a constant neutron source independent of the fluxes, is investigated. The adjoint problem can also be solved. The program can perform the straight Keff calculation and three types of criticality searches - dilution factor search for a control isotope having a given distribution over the reactor, density search of a control isotope present in one reactor region or in a set of regions (control bank), boundary search for the control region or the control bank in which a control isotope is present with a given  density.
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4. METHOD OF SOLUTION

The mathematical model employed for the solution of the finite difference equations is the one-line Chebyshev semi-iterative method.
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5. RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM

Maximum number of - groups - 40
                    compositions - 200
                    rows - 200
                    columns - 200
                    mesh points - 10000
                    control banks - 100
                    elements in the control list - 400
                    control areas - 100
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6. TYPICAL RUNNING TIME:  5 to 15 minutes.
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7. UNUSUAL FEATURES OF THE PROGRAM

A complete scattering matrix is used by the program, i.e. down- and up-scattering are both considered.
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8. RELATED AND AUXILIARY PROGRAMS

SQUID-2PG, which is a reduced version of SQUID, but also treats the r-theta geometry.
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9. STATUS
Package ID Status date Status
NEA-0414/01 01-DEC-1974 Tested at NEADB
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10. REFERENCES

- A. Daneri, B. Gabutti, and F. Salina:
  'SQUID-360, A Multigroup Diffusion Program with Criticality
  Searches for the IBM-360.'
  FN-E-86 (1967), and EUR-3882 E (1968).
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11. MACHINE REQUIREMENTS:  300k to 400k bytes main storage. Magnetic tapes.
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12. PROGRAMMING LANGUAGE(S) USED
Package ID Computer language
NEA-0414/01 FORTRAN-IV
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13. OPERATING SYSTEM OR MONITOR UNDER WHICH PROGRAM IS EXECUTED:  IBM 370/OS.
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14. OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS

ANY OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS
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15. NAME AND ESTABLISHMENT OF AUTHOR

   FIAT Nucleare
   Torino, Italy
   ARS, Applicazioni Ricerche Scientifiche
   Milano, Italy.
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16. MATERIAL AVAILABLE
NEA-0414/01
File name File description Records
NEA0414_01.001 SOURCE PROGRAM EBCDIC (F4) 4608
NEA0414_01.002 ALTERNATIVE MAIN PROGRAMS (2) EBCDIC (F4) 258
NEA0414_01.003 SAMPLE PROBLEM DATA 38
NEA0414_01.004 JCL + OVERLAY CARDS 44
NEA0414_01.005 SAMPLE PROBLEM PRINTED OUTPUT 3132
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17. CATEGORIES
  • C. Static Design Studies

Keywords: criticality, diffusion, multigroup, neutrons, r-z, two-dimensional, x-y.