last modified: 01-JUN-1980 | catalog | categories | new | search |

NEA-0564 XBWR.

XBWR, 1-D Xe Transients for BWR in Axial Geometry

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1. NAME OR DESIGNATION OF PROGRAM:  XBWR.
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2. COMPUTERS
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Program name Package id Status Status date
XBWR NEA-0564/01 Tested 01-JUN-1980

Machines used:

Package ID Orig. computer Test computer
NEA-0564/01 IBM 370 series IBM 370 series
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3. NATURE OF PHYSICAL PROBLEM SOLVED:  1-D xenon transients for BWRS in  axial geometry.
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4. METHOD OF SOLUTION

XBWR couples a two group neutron diffusion calculation in plane geometry with a two phase flow cooling channel  calculation and the heat conduction in the typical fuel rod. The program allows following any given power time schedule, such as shut-down and restart, day-night power variation etc., while the reactor is being kept critical by control rod movement, variable poisoning of the core, or coolant flow recirculation rate. The xenon and iodine concentrations variation is evaluated pointwise (up to 100 points) by analytical solution for successive fixed time steps. At the end of each time step a new distribution of fluxes, power, voids and temperatures is obtained, which is consistent with the reactor critical condition as it is got by variation of the control  parameter taking into account the feedbacks. The new flux distribution is used as input for xenon and iodine concentrations evolution in the next time step.
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5. RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM
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6. TYPICAL RUNNING TIME

An average case of 30 to 50 mesh points, with  boiling channel and recirculation flow control will take about 10 minutes of IBM 360 for 150 time steps.
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7. UNUSUAL FEATURES: UNUSUAL FEATURES OF THE PROGRAM
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8. RELATED AND AUXILIARY PROGRAMS:  COSTANZA, FRANCESCA
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9. STATUS
Package ID Status date Status
NEA-0564/01 01-JUN-1980 Tested at NEADB
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10. REFERENCES
NEA-0564/01, included references:
- G. Forti:
XBWR, A One Dimensional Xenon Transient Programme for Boiling Nuclear Reactors
Joint Nuclear Research Centre, Ispra, Italy (EUR 4603e, 1971)
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11. MACHINE REQUIREMENTS

Assembled in FORTRAN 4 level 0 the total length was 18a04 bytes.
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12. PROGRAMMING LANGUAGE(S) USED
Package ID Computer language
NEA-0564/01 FORTRAN-IV
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13. OPERATING SYSTEM OR MONITOR UNDER WHICH PROGRAM IS EXECUTED:  IBM 360 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 AUTHORS

NAME AND ESTABLISHMENT OF AUTHOR:
    G.Forti
    Reactor Physics Department
    Joint Nuclear Research Centre
    Ispra Establishment,
    Ispra, Italy
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16. MATERIAL AVAILABLE
NEA-0564/01
File name File description Records
NEA0564_01.001 INFORMATION 12
NEA0564_01.002 SOURCE (F4,EBCDIC) 1613
NEA0564_01.003 S. P. INPUT DATA 32
NEA0564_01.004 S. P. OUTPUT 858
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17. CATEGORIES
  • F. Space - Time Kinetics, Coupled Neutronics - Hydrodynamics - Thermodynamics

Keywords: BWR reactors, fuel rods, heat transfer, iodine, neutron diffusion equation, one-dimensional, reactor channels, transients, two-group, two-phase flow, xenon.