NESC0223 GAD-2.

GAD-2, Fuel Cycle Depletion Calculation with Partial Refueling and Fuel Recycling

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: GAD-2.

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2. COMPUTERS

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Program name	Package id	Status	Status date
GAD-2	NESC0223/01	Tested	01-OCT-1966

Machines used:

Package ID	Orig. computer	Test computer
NESC0223/01	IBM 7044	IBM 7044

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3. NATURE OF PHYSICAL PROBLEM SOLVED

This infinite-medium depletion program performs fuel cycle calculations on reactors employing partial refueling. The burnup of up to 12 discrete fuel compositions (regions or stages of irradiation) may be followed simultaneously. The burnup calculation may be interrupted periodically to remove the contents and to refuel one or more regions. Fuel may be partially or completely recycled.

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4. METHOD OF SOLUTION

All regions are assumed to be subjected to the same neutron flux and the depletion calculations are performed with a series of short time-steps. After each time-step the flux amplitude is renormalized to the power and the spectrum may be recalculated after a specified series of these steps.

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5. RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM

   Maximum number of energy groups = 15
   Maximum number of fuel compositions or regions = 12
   Maximum number of nuclides per region = 35
   Maximum number of moderator nuclides with thermal transfer matrix = 3.
   2 fixed heavy nuclide chains are always present.

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6. TYPICAL RUNNING TIME: 1 to 3 minutes are required.

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7. UNUSUAL FEATURES OF THE PROGRAM

This program is useful in studying the approach to equilibrium fuel cycle.

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8. RELATED AND AUXILIARY PROGRAMS

This code is a simplified version of the GAD code (GA-4150) which runs about 4 times longer but contains variable shielding factors, control searches, and cost calculations. Cards may be punched at each time-step in a format acceptable to the WAMPUM fuel cycle cost code (ACC abstract 224).

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9. STATUS

Package ID	Status date	Status
NESC0223/01	01-OCT-1966	Tested at NEADB

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10. REFERENCES

NESC0223/01, included references:

- F.W. Todt:
  Revised GAD - An Infinite Medium Depletion Program for Reactor
  Fuel Cycle Analysis
  GA-6635 (November 10, 1965).

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11. MACHINE REQUIREMENTS: 32k IBM7044, 3 tapes (input, output, system).

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12. PROGRAMMING LANGUAGE(S) USED

Package ID	Computer language
NESC0223/01	FORTRAN-IV

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13. OPERATING SYSTEM OR MONITOR UNDER WHICH PROGRAM IS EXECUTED: IBM 7040/7044 operating system (16/32k), version ix.

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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

                 F. W. Todt
                 Gulf General Atomic Incorporated
                 P. O. Box 608
                 San Diego, California 92112

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16. MATERIAL AVAILABLE

NESC0223/01