Computer Programs

NEA-0979 RETRANS.

NEA-0979 RETRANS.

RETRANS, Reactivity Transients in LWR

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: RETRANS.

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2. COMPUTERS

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Program name	Package id	Status	Status date
RETRANS	NEA-0979/01	Tested	15-MAR-1989

Machines used:

Package ID	Orig. computer	Test computer
NEA-0979/01		IBM 3084

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3. DESCRIPTION OF PROGRAM OR FUNCTION

RETRANS is appropriate to calculate power excursions in light water reactors initiated by reactivity insertions due to withdrawal of control elements. As in the code TWIGL, the neutron physics model is based on the time-dependent two-group neutron diffusion equations. The equation of state of the coolant is approximated by a table built into the code. RETRANS solves the heat conduction equation and calculates the heat transfer coefficient for representative fuel rods at each time-step.

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4. METHOD OF SOLUTION

The time-dependent neutron diffusion equations are modified by an exponential transformation and solved by means of a finite difference method. There is an option accelerating the inner iterations of the difference scheme by a coarse-mesh rebalancing method. The heat balance equations of the thermo- hydraulic model are discretized and converted into a tridiagonal system of linear equations which is solved recursively.

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5. RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM: r-z-geometry, one- phase-flow.

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6. TYPICAL RUNNING TIME:

NEA-0979/01

NEA-DB ran the test case included in the package on an IBM 3084 computer in 9 minutes 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-0979/01	15-MAR-1989	Tested at NEADB

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10. REFERENCES:

NEA-0979/01, included references:

- G. Kamelander:
RETRANS - A Program for Calculating Reactivity Transients.
Reprint from Computer Physics Communications 38 (1985) CPC00507

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11. MACHINE REQUIREMENTS: 161792 bytes.

NEA-0979/01

To run the test case on IBM 3084, 692K bytes of main storage were required.

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12. PROGRAMMING LANGUAGE(S) USED

Package ID	Computer language
NEA-0979/01	FORTRAN-IV

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13. OPERATING SYSTEM UNDER WHICH PROGRAM IS EXECUTED:

NEA-0979/01

MVS-SP (IBM 3084).

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14. OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS: Number
of lines in combined program and test deck: 2316.

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15. NAME AND ESTABLISHMENT OF AUTHORS

          G. Kamelander
          Institut fuer Reaktorsicherheit
          Osterreichisches Forschungszentrum Seibersdorf GMBH
          Lenaugasse 10
          1082 Vienna, Austria

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16. MATERIAL AVAILABLE

NEA-0979/01

File name	File description	Records
NEA0979_01.001	Information file	55
NEA0979_01.002	RETRANS source program (fortran h extended)	2311
NEA0979_01.003	RETRANS sample input data	116
NEA0979_01.004	RETRANS sample output printing	5670

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17. CATEGORIES

E. Space-Independent Kinetics

Keywords: finite difference method, reactor dynamics, reactor kinetics, transients.