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NEA-0415 TRITON.

TRITON, 3-D Multi-Region Neutron Diffusion Burnup with Criticality Search

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1. NAME OR DESIGNATION OF PROGRAM:  TRITON.
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2. COMPUTERS
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Program name Package id Status Status date
TRITON NEA-0415/01 Tested 01-DEC-1974

Machines used:

Package ID Orig. computer Test computer
NEA-0415/01 IBM 370 series IBM 370 series
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3. NATURE OF PHYSICAL PROBLEM SOLVED

TRITON is a multigroup diffusion  depletion program in three dimensions (x,y,z). In addition to the straight Keff calculation, three types of criticality searches are possible - diluted control isotope search, regionwise smeared control isotope search, region-wise smeared control isotope search,  region-wise smeared control isotope boundary search (the control isotope can be smeared over one region or over a group of regions called a control bank).
The depletion equations are solved region-wise.
More than one microscopic cross section library can be used in the various regions of the reactor. The same is true for selfshielding factors. Such sets of data can be changed at pre-determined time steps.
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4. METHOD OF SOLUTION

The mathematical model employed for the solution of the finite difference equations, which is derived from a seven-point approximation of diffusion equations, is an on-line Chebyshev semi- iterative method.
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5. RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM

Maximum number of - library sets - 1
                    selfshielding sets - 10
                    compositions - 100
                    selfshielding coefficients - 6000
                    groups - 10
                    fuel isotopes - 30
                    fission products - 29
                    isotopes - 50
                    burnable isotopes - 40
                    control banks - 100
                    mesh points - 15000
                    regions - 400
                    time steps - 100
                    control areas - 100
                    small time steps - 200
                    elements in the control list - 400
                    x planes - 100
                    y planes - 100
                    z planes - 100.
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6. TYPICAL RUNNING TIME
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7. UNUSUAL FEATURES OF THE PROGRAM

TRITON is not restricted to a fixed chain of burnable isotopes, but may treat any isotopic chain specified in input (with some minor restrictions). However, a standard chain is incorporated in the program and contains - 6 fuel  isotopes (U-235, U-236, Pu-239, Pu-240, Pu-241), 2 pairs of single fission products (Pr-149, Sm-149, I-135, Xe-135), a lumped fission product, boron, a burnable poison. Automatic fuel shuffling is allowed.
The selfshielding factors are automatically calculated at each time  step by means of given rules.
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8. RELATED OR AUXILIARY PROGRAMS: RELATED AND AUXILIARY PROGRAMS
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9. STATUS
Package ID Status date Status
NEA-0415/01 01-DEC-1974 Tested at NEADB
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10. REFERENCES

- A. Daneri, G. Maggioni, and E. Salina:
  'TRITON, A Multigroup Diffusion-Depletion Program in Three
  Dimensions for IBM-360'
  FN-E-97 (May 1968).
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11. MACHINE REQUIREMENTS

300k to 400k bytes of main storage. Magnetic tapes and disks.
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12. PROGRAMMING LANGUAGE(S) USED
Package ID Computer language
NEA-0415/01 FORTRAN-IV
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13. OPERATING SYSTEM OR MONITOR UNDER WHICH PROGRAM IS EXECUTED:  IBM 360/370 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

    ARS, Applicazioni Ricerche Scientifiche
    Milano, Italy
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16. MATERIAL AVAILABLE
NEA-0415/01
File name File description Records
NEA0415_01.001 SOURCE PROGRAM EBCDIC (F4) 6687
NEA0415_01.002 SAMPLE PROBLEM DATA 284
NEA0415_01.003 JCL + OVERLAY CARDS 54
NEA0415_01.004 SAMPLE PROBLEM PUNCHED OUTPUT 48
NEA0415_01.005 SAMPLE PROBLEM PRINTED OUTPUT 4504
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17. CATEGORIES
  • C. Static Design Studies
  • D. Depletion, Fuel Management, Cost Analysis, and Power Plant Economics

Keywords: burnup, criticality, depletion, diffusion equations, multigroup, neutrons, self-shielding, three-dimensional, x-y-z.