last modified: 01-MAY-1974 | catalog | categories | new | search |

NEA-0397 FRANCESCA-BWR.

FRANCESCA-BWR, 2 Phase Flow Dynamic for BWR Cooling Channel

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1. NAME OR DESIGNATION OF PROGRAM:  FRANCESCA-BWR.
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2. COMPUTERS
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Program name Package id Status Status date
FRANCESCA-BWR NEA-0397/01 Tested 01-MAY-1974

Machines used:

Package ID Orig. computer Test computer
NEA-0397/01 IBM 370 series IBM 370 series
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3. NATURE OF PHYSICAL PROBLEM SOLVED

The steady state and transient problem of a number of parallel BWR coolant channels are solved by the finite difference method. The two-phase flow model includes subcooled boiling and vapour recondensation in the subcooled region.
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4. METHOD OF SOLUTION

The heat transmission in a cylindrical fuel element and cladding is considered at each axial level, with neglect of axial heat conduction. Heat transmission from cladding surface to coolant is governed by Colburn and Jeans & Lottes correlations in convective and boiling transmission, respectively. The subcooled boiling inception point is determined by an original method and vapour production in the subcooled region is evaluated essentially by Bowring's method. DNB correlations are not included and film boiling is not considered. The power distribution is freely specified in input, as well as power evolution during time. The coolant flow redistribution among the different groups of channels is evaluated by the program both in steady state and transients.
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5. RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM

RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM. Pressure drop inside  channels must be small compared to the general pressure level. The pressure variation must be slow.  No acoustic waves are considered.
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6. TYPICAL RUNNING TIME:  One minute.
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7. UNUSUAL FEATURES OF THE PROGRAM

The kinematic model is essentially  that of Zuber and Findlay and includes the average effect of local vapour drift as well as that of velocity and concentration distributions.
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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-0397/01 01-MAY-1974 Tested at NEADB
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10. REFERENCES
NEA-0397/01, included references:
- G. Forti:
  'FRANCESCA BWR, A Numerical Programme for the Steady State and Dynamic
Calculation of Parallel Coolant Channels for BWR Nuclear Reactors'
  Preprint (to be published).
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11. HARDWARE REQUIREMENTS: MACHINE REQUIREMENTS
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12. PROGRAMMING LANGUAGE(S) USED
Package ID Computer language
NEA-0397/01 FORTRAN-IV
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13. OPERATING SYSTEM OR MONITOR UNDER WHICH PROGRAM IS EXECUTED:  IBM 370/O.S.
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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: G. Forti
J.R.C. EURATOM
Ispra Establishment, Italy
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16. MATERIAL AVAILABLE
NEA-0397/01
File name File description Records
NEA0397_01.001 SOURCE PROGRAM (F4) 1606
NEA0397_01.002 SAMPLE INPUT 32
NEA0397_01.003 OUTPUT LIST OF SAMPLE PROBLEM 905
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17. CATEGORIES
  • F. Space - Time Kinetics, Coupled Neutronics - Hydrodynamics - Thermodynamics
  • H. Heat Transfer and Fluid Flow

Keywords: BWR reactors, finite difference method, fuel elements, heat transfer, hydrodynamics, loss-of-coolant accident, steady-state conditions, two-phase flow.