NEA-0396: FRANCESCA, 2 Phase Flow Dynamic in Boiling Test Channel and Heat Elements Conduction

OECD Nuclear Energy Agency / L'Agence pour l'énergie nucléaire

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NEA-0396 FRANCESCA. (Abstract last modified 01-MAY-1974)

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

Abstract Table of Contents:

OPERATING SYSTEM

OTHER RESTRICTIONS

1. NAME OR DESIGNATION OF PROGRAM - FRANCESCA.

2. COMPUTER FOR WHICH PROGRAM IS DESIGNED AND OTHER MACHINE VERSION PACKAGES AVAILABLE -

To request or retrieve programs click on the one of the active versions below. A password and special authorization is required.

Explanation of the status codes.

Program-name Package-ID Status FRANCESCA NEA-0396/01 Tested

Machines used: Package-ID Orig.Computer Test Computer NEA-0396/01 IBM 370 series IBM 370 series

3. NATURE OF PHYSICAL PROBLEM SOLVED - Two-phase flow dynamics for test of reactor channels and heat conduction in the heating elements.

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.

5. RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM - Constant pressure, forced circulation. No flow reversal is permitted.

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.

7. UNUSUAL FEATURES OF THE PROGRAM - Full treatment of subcooled boiling. Vapour recondensation and liquid overheating are included as options.

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.

9. STATUS
NEA-0396/01: 01-MAY-1974 Tested at NEADB

10. REFERENCES  -
- G. Forti:
  'A Dynamic Model for the Cooling Channels'
   EUR 2398/A
NEA-0396/01:
- G. Forti:
'FRANCESCA, A Dynamic Program for Boiling Cooling Channels'
  EUR 4241.E (1969).

11. MACHINE REQUIREMENTS - Less than 100Kbytes.

12. PROGRAMMING LANGUAGE(S) USED -
NEA-0396/01: FORTRAN-IV

13. OPERATING SYSTEM OR MONITOR UNDER WHICH PROGRAM IS EXECUTED. IBM
360 O.S.

14. ANY OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS -

15. NAME AND ESTABLISHMENT OF AUTHOR -
G. Forti
J.R.C. EURATOM
Ispra Establishment, Italy.

16. MATERIAL AVAILABLE -
NEA-0396/01:
NEA0396_01.001    SOURCE PROGRAM (F4)                              1930 records
NEA0396_01.002    SAMPLE INPUT                                       18 records
NEA0396_01.003    OUTPUT LIST OF SAMPLE PROBLEM                     598 records

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, LOCA, REACTOR CHANNELS, REACTOR SAFETY, TWO-PHASE FLOW

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