Computer Programs

NEA-0414 SQUID-360.

NEA-0414 SQUID-360.

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

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

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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.