NEA-0101 REP-3.

REP-3, Time-Dependent Xe and Sm Poisoning from Space-Dependent Flux Distribution

NAME OR DESIGNATION OF PROGRAM, COMPUTER, NATURE OF PHYSICAL PROBLEM SOLVED, METHOD OF SOLUTION, RESTRICTIONS, 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, ANY OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS, NAME AND ESTABLISHMENT OF AUTHOR, MATERIAL, CATEGORIES

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1. NAME OR DESIGNATION OF PROGRAM: REP-3.

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2. COMPUTERS

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Program name	Package id	Status	Status date
REP-3	NEA-0101/01	Tested	01-OCT-1971

Machines used:

Package ID	Orig. computer	Test computer
NEA-0101/01	IBM 360 series	IBM 360 series

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3. NATURE OF PHYSICAL PROBLEM SOLVED

Time variation of xenon and samarium poisoning due to space-dependent flux distribution.
Conventional space independent poisoning also computed. Power variations given in histogram form.

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4. METHOD OF SOLUTION

Three-dimensional flux and adjoint distributions are synthesised from 1- and 2-dimensional runs. Fluxes are sorted into n equal intervals and flux adjoint weight is calculated for each interval. This weighting function is then used to compute reactivity worth of poisons as function of time. N is normally of order 100.

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5. RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM

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6. TYPICAL RUNNING TIME

About 30 printing steps per second with 100 point weighting function.

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7. UNUSUAL FEATURES OF THE PROGRAM

More accurate than space independent approximation for reactors with widely varying flux distribution. Much faster than computing poisoning at every mesh point.

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8. RELATED AND AUXILIARY PROGRAMS

Programme CRAM to produce two-dimensional fluxes and adjoints.
Programme WTAP to produce weighting function.

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9. STATUS

Package ID	Status date	Status
NEA-0101/01	01-OCT-1971	Tested at NEADB

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10. REFERENCES

NEA-0101/01, included references:

- A. Brickstock and A.R. Davies:
  REP3 - A Spatially Dependant Fission Product Poisoning Code
  for the IBM 7030
  AWRE O-69/66 (January 1967)

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11. MACHINE REQUIREMENTS

REP-3 - 32k storage but easily modified for smaller store. Clock if available.
WTAP. 32k storage but easily modified for smaller store.
One tape unit.

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12. PROGRAMMING LANGUAGE(S) USED

Package ID	Computer language
NEA-0101/01	FORTRAN-STRETCH (IBM-7030)

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13. OPERATING SYSTEM OR MONITOR UNDER WHICH PROGRAM IS EXECUTED

REP-3 - S2 under monitor control (7030).
WTAP FORTRAN II under monitor control (7090).

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14. ANY OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS

Programme CRAM readily replaced with any comparable two-dimensional programme.

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15. NAME AND ESTABLISHMENT OF AUTHOR

A. Brickstock
                                   R. Davies
                                   A.W.R.E.
                                   Aldermaston
                                   Berks
                                   U.K.

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16. MATERIAL AVAILABLE

NEA-0101/01

File name	File description	Records
NEA0101_01.001	SOURCE PROGRAMME + INPUT DATA FOR SAMPLE CAS	292
NEA0101_01.002	OUTPUT LIST OF SAMPLE CASE	75

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17. CATEGORIES

D. Depletion, Fuel Management, Cost Analysis, and Power Plant Economics
F. Space - Time Kinetics, Coupled Neutronics - Hydrodynamics - Thermodynamics

Keywords: flux synthesis, kinetics, poisoning, power distribution, space dependence, three-dimensional, time dependence.