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NEA-0816 MUENSTER.

MUENSTER, 2-D R-Z Geometry Thermohydraulics Calculation for Pebble-Bed Reactor

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1. NAME OR DESIGNATION OF PROGRAM:  MUENSTER.
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2. COMPUTERS
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Program name Package id Status Status date
MUENSTER NEA-0816/01 Tested 18-MAY-1984

Machines used:

Package ID Orig. computer Test computer
NEA-0816/01 IBM 3081 IBM 3081
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3. DESCRIPTION OF PROBLEM OR FUNCTION

MUENSTER is a two dimensional r-z thermohydraulic code. It analyses the thermal performance of pebble bed reactors under normal operating conditions. It calculates the distribution of gas temperature and mass flow. The code determines the surface and maximum temperatures of the pebbles including thermal radiation. Further it evaluates the pressure drop  and the fuel and moderator temperatures to be used in neutron spectrum calculations.
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4. METHOD OF SOLUTION

The total coolant flow is distributed along arbitrary mesh lines in the core and bottom reflector. To satisfy the pressure equation a set of fictive circulation flows, super- imposed to the total flow, is calculated by an iterative method. The gas temperature calculation according to the given power density distribution is taken into account. With the known data for power density, gas temperature and gas flow distribution, the temperature  distribution in the fuel elements may be calculated. The effect of thermal radiation is included.
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5. RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM

The code uses variable dimensions. Thus the present limit of 2500 meshes approximately may be easily changed.
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6. TYPICAL RUNNING TIME

Less than one minute on IBM 3033 CPU time is  required for a typical HTR calculation.
NEA-0816/01
NEA-DB executed the test case on IBM 3081K in 7.8 sec 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-0816/01 18-MAY-1984 Tested at NEADB
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10. REFERENCES:
NEA-0816/01, included references:
- THTR 300 Program Description "MUENSTER" (in German).
  EA-0176 (September 17, 1981).
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11. MACHINE REQUIREMENTS

70 kbytes besides the standard input/output units. At least one direct access device is required.
NEA 0816/01: The test case execution on IBM 3081K required 280K bytes of main storage.
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12. PROGRAMMING LANGUAGE(S) USED
Package ID Computer language
NEA-0816/01 FORTRAN-IV
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13. OPERATING SYSTEM UNDER WHICH PROGRAM IS EXECUTED:  IBM MVS.
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14. OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS

The convergence depends on the quality of the values for the distribution of gas temperature and mass flow, which in turn may be  stored for restart.
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15. NAME AND ESTABLISHMENT OF AUTHOR

          J. Kalra
          Hochtemperatur Reaktorbau GmbH
          D-6800 Manheim 1
          Gottlieb-Daimler-Str. 8
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16. MATERIAL AVAILABLE
NEA-0816/01
File name File description Records
NEA0816_01.002 MUENSTER INFORMATION 56
NEA0816_01.004 MUENSTER SOURCE PROGRAM (FORTRAN-4) 3245
NEA0816_01.005 MUENSTER JCL & OVERLAY INSTRUCTIONS 81
NEA0816_01.006 MUENSTER TEST CASE INPUT DATA 1044
NEA0816_01.007 MUENSTER TEST CASE PRINTED OUTPUT 3506
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17. CATEGORIES
  • H. Heat Transfer and Fluid Flow

Keywords: HTR reactors, fluid flow, fuel elements, gases, pebble bed reactors, pressure gradients, r-z, temperature distribution, thermal radiation, two-dimensional.