NEA-0712 CASSANDRE.

CASSANDRE, 2-D Reactor Dynamic FEM Program with Thermohydraulic Feedback

NAME OR DESIGNATION OF PROGRAM, COMPUTER, DESCRIPTION OF PROGRAM OR FUNCTION, 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 UNDER WHICH PROGRAM IS EXECUTED, OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS, NAME AND ESTABLISHMENT OF AUTHORS, MATERIAL, CATEGORIES

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1. NAME OR DESIGNATION OF PROGRAM: CASSANDRE.

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2. COMPUTERS

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Program name	Package id	Status	Status date
CASSANDRE	NEA-0712/01	Tested	25-JUN-1987

Machines used:

Package ID	Orig. computer	Test computer
NEA-0712/01	IBM 370 series	IBM 3084

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3. DESCRIPTION OF PROGRAM OR FUNCTION

CASSANDRE is a two-dimensional (x-y or r-z) finite-elements neutronics code with thermohydraulic feedback for reactor dynamics prior to the disassembly phase. The code was conceived in order to be coupled with any thermohydraulics module, although thermohydraulics feedback is only considered in r-z geometry. In the steady state, criticality search is possible either by control-rod insertion or by homogeneous poisoning of the coolant.

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4. METHOD OF SOLUTION

The program uses multigroup diffusion theory. Its main characteristics are the use of a generalized quasi-static model, the use of a flexible multigroup point-kinetics algorithm allowing for spectral matching, and the use of a finite elements description.

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5. RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM: The user must prepare a cross section library.

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6. TYPICAL RUNNING TIME:

NEA-0712/01

NEA-DB executed the test case included in this package on an IBM 3084 computer in 88 seconds of CPU time.

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7. UNUSUAL FEATURES OF THE PROGRAM:

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8. RELATED AND AUXILIARY PROGRAMS:

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9. STATUS

Package ID	Status date	Status
NEA-0712/01	25-JUN-1987	Tested at NEADB

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10. REFERENCES:

NEA-0712/01, included references:

- B. Arien, A. Siebertz, J. Devooght and E. Mund:
  CASSANDRE: A Two-Dimensional Multigroup Diffusion Code For Reactor
  Transients Analysis.
  BLG 571  (September 1984)
- B. Arien and J. Daniels:
  CASSANDRE: A Two-Dimensional Multigroup Diffusion Code For Reactor
  Transients Analysis. Code Description and User's Guide.
  BLG 591  (December 1986)

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11. MACHINE REQUIREMENTS:

NEA-0712/01

On an IBM 3084 computer, 952K bytes of main storage (without overlay) were required to execute the test case.

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12. PROGRAMMING LANGUAGE(S) USED

Package ID	Computer language
NEA-0712/01	FORTRAN-IV

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13. OPERATING SYSTEM UNDER WHICH PROGRAM IS EXECUTED:

NEA-0712/01

MVS-SP (IBM 3084).

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14. OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS:

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15. NAME AND ESTABLISHMENT OF AUTHORS

     B. ARIEN and J. DANIELS
     Centre d'etudes de l'energie nucleaire
     1, rue Ch. Lemaire
     1160 BRUXELLES, Belgium

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16. MATERIAL AVAILABLE

NEA-0712/01

File name	File description	Records
NEA0712_01.001	Information file	54
NEA0712_01.002	Fortran source (neutronics part)	9014
NEA0712_01.003	Fortran source (thermohydraulics part)	340
NEA0712_01.004	Fortran source (thermohydraulics benchmark)	128
NEA0712_01.005	Fortran source (dummy subroutines)	9
NEA0712_01.006	Data (Benchmark test problem)	200
NEA0712_01.007	Sample problem output list	5430
NEA0712_01.008	Sample JCL used at NEA-DB	143

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17. CATEGORIES

F. Space - Time Kinetics, Coupled Neutronics - Hydrodynamics - Thermodynamics
G. Radiological Safety, Hazard and Accident Analysis

Keywords: criticality searches, diffusion equations, finite element method, hydraulics, kinetics, multigroup, r-z, reactor kinetics, thermodynamics, two-dimensional, x-y.