last modified: 15-MAR-1989 | catalog | categories | new | search |

NEA-0979 RETRANS.

RETRANS, Reactivity Transients in LWR

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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 SIEMENS 7541 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.