NEA-0415 TRITON.

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

NAME OR DESIGNATION OF PROGRAM, COMPUTER, NATURE OF PHYSICAL PROBLEM SOLVED, METHOD OF SOLUTION, RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM, CPU, UNUSUAL FEATURES OF THE PROGRAM, AUXILIARIES, 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: 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