NEA-0396 FRANCESCA.

FRANCESCA, 2 Phase Flow Dynamic in Boiling Test Channel and Heat Elements Conduction

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, OTHER RESTRICTIONS, NAME AND ESTABLISHMENT OF AUTHOR, MATERIAL, CATEGORIES

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1. NAME OR DESIGNATION OF PROGRAM: FRANCESCA.

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2. COMPUTERS

To submit a request, click below on the link of the version you wish to order. Only liaison officers are authorised to submit online requests. Rules for requesters are available here.

Program name	Package id	Status	Status date
FRANCESCA	NEA-0396/01	Tested	01-MAY-1974

Machines used:

Package ID	Orig. computer	Test computer
NEA-0396/01	IBM 370 series	IBM 370 series

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3. NATURE OF PHYSICAL PROBLEM SOLVED

Two-phase flow dynamics for test of reactor channels and heat conduction in the heating elements.

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4. METHOD OF SOLUTION

The finite difference method is employed, with up to 100 mesh points in the active part of the channel and 10 more points in the riser. The program is intended for forced circulation and highly pressurized systems, for which the pressure drop in the channel may be considered negligible compared to the general pressure level, so that the coolant fluid properties may be assumed to be independent of space and time. The driving pressure may be taken as a quadratic function of the mass flow, to simulate pump characteristics, or given as a time table. The power distribution in the heating element is given as a fixed arbitrary shape, while the power level is any tabulated function of time.

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5. RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM

Constant pressure, forced circulation. No flow reversal is permitted.

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6. TYPICAL RUNNING TIME

Running time depends very much on the problem. An average problem with 20 meshes and 200 time steps takes one minute on IBM 360/65.

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7. UNUSUAL FEATURES OF THE PROGRAM

Full treatment of subcooled boiling. Vapour recondensation and liquid overheating are included as options.

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8. RELATED AND AUXILIARY PROGRAMS

COSTAX-BOIL, a complete one- dimensional dynamics program for BWR or PWR reactors, includes FRANCESCA as the thermal calculation part, coupled with COSTANZA two groups one-dimensional diffusion equations.

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9. STATUS

Package ID	Status date	Status
NEA-0396/01	01-MAY-1974	Tested at NEADB

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10. REFERENCES

- G. Forti:
'A Dynamic Model for the Cooling Channels'
EUR 2398/A

NEA-0396/01, included references:

- G. Forti:
'FRANCESCA, A Dynamic Program for Boiling Cooling Channels'
EUR 4241.E (1969).

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11. MACHINE REQUIREMENTS: Less than 100Kbytes.

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12. PROGRAMMING LANGUAGE(S) USED

Package ID	Computer language
NEA-0396/01	FORTRAN-IV

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13. SOFTWARE REQUIREMENTS

OPERATING SYSTEM OR MONITOR UNDER WHICH PROGRAM IS EXECUTED. IBM
360 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-0396/01

File name	File description	Records
NEA0396_01.001	SOURCE PROGRAM (F4)	1930
NEA0396_01.002	SAMPLE INPUT	18
NEA0396_01.003	OUTPUT LIST OF SAMPLE PROBLEM	598

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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, heat transfer, hydrodynamics, loss-of-coolant accident, reactor channels, reactor safety, two-phase flow.