Computer Programs

NEA-0425 COSTANZA-XE.

NEA-0425 COSTANZA-XE.

COSTANZA-XE, 2-D Pebble-Bed or Prismatic Fuel Elements HTR Dynamic in Cylindrical Geometry

NAME OR DESIGNATION OF PROGRAM, COMPUTER, NATURE OF PHYSICAL PROBLEM SOLVED, METHOD OF SOLUTION, RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM, TYPICAL RUNNING TIME, FEATURES, RELATED AND AUXILIARY PROGRAMS, STATUS, REFERENCES, MACHINE REQUIREMENTS, LANGUAGE, OPERATING SYSTEM OR MONITOR UNDER WHICH PROGRAM IS EXECUTED, OTHER RESTRICTIONS, NAME AND ESTABLISHMENT OF AUTHOR, MATERIAL, CATEGORIES

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1. NAME OR DESIGNATION OF PROGRAM: COSTANZA-XE.

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2. COMPUTERS

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Program name	Package id	Status	Status date
COSTANZA-XE	NEA-0425/01	Tested	01-JUN-1974

Machines used:

Package ID	Orig. computer	Test computer
NEA-0425/01	IBM 370 series	IBM 370 series

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3. NATURE OF PHYSICAL PROBLEM SOLVED

Two-dimensional reactor dynamics in cylindrical geometry. The code is especially designed for high temperature pebble bed reactors or for reactors with prismatic elements. Optionally it can be used for the study of fast transients or for slow operational transients with xenon variation.

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4. METHOD OF SOLUTION

The neutronics uses a Krouk-Nicolson method, with direct solution along the radii for both energy groups, and Gauss-Seidel iterative method in axial (z) direction. The thermohydraulics is solved separately for each channel in two dimensions. The system of heat balance equations is solved with a direct method at each axial level. The solution obtained at the level (i) is used as boundary condition for the level (i+1).

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5. RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM

Two energy groups, six groups of delayed neutrons. The maximum number of mesh points is 350.

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6. TYPICAL RUNNING TIME: 15 minutes.

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7. UNUSUAL FEATURES: UNUSUAL FEATURES OF THE PROGRAM

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8. RELATED AND AUXILIARY PROGRAMS

COSTANZA-BBK one-dimensional (EUR 4410 E)
COSTANZA-RZ (EUR 4673 E).

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9. STATUS

Package ID	Status date	Status
NEA-0425/01	01-JUN-1974	Tested at NEADB

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10. REFERENCES

NEA-0425/01, included references:

- K. Friedrich, E. Infuehr, L. Massimo, and E. Vincenti:
  'COSTANZA HRB, A Two Dimensional Dynamic Programme for High
   Temperature Gas Cooled Reactors and its Application to the THTR
   300 MWE Power Plant'
  EUR 5022 E (1973).
- Informal notes.

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11. MACHINE REQUIREMENTS: 256k bytes main storage. One tape.

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12. PROGRAMMING LANGUAGE(S) USED

Package ID	Computer language
NEA-0425/01	FORTRAN-IV

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13. OPERATING SYSTEM OR MONITOR UNDER WHICH PROGRAM IS EXECUTED: Standard.

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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: E. Vincenti (+)
C.C.R. EURATOM
Ispra Establishment, Italy.

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16. MATERIAL AVAILABLE

NEA-0425/01

File name	File description	Records
NEA0425_01.001	SOURCE PROGRAM (F4)	2622
NEA0425_01.002	OVERLAY CARDS	8
NEA0425_01.003	SAMPLE INPUT	115
NEA0425_01.004	OUTPUT LIST OF SAMPLE PROBLEM	2989

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17. CATEGORIES

F. Space - Time Kinetics, Coupled Neutronics - Hydrodynamics - Thermodynamics

Keywords: HTGR reactors, hydraulics, iterative methods, pebble bed reactors, reactor kinetics, thermodynamics, transients, two-dimensional, xenon oscillations.