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NEA-0536 HERA-1A.

HERA-1A, Steady-State Thermohydraulics of Na Cooled Fuel Rod Bundles

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1. NAME OR DESIGNATION OF PROGRAM:  HERA-1A.
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2. COMPUTERS
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Program name Package id Status Status date
HERA-1A NEA-0536/01 Tested 01-OCT-1977

Machines used:

Package ID Orig. computer Test computer
NEA-0536/01 IBM 370 series IBM 370 series
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3. NATURE OF PHYSICAL PROBLEM SOLVED

The program performs the steady state thermohydraulic analysis of multirod fuel bundles cooled by an incompressible fluid under non-boiling conditions. The present 1a version of HERA considers a hexagonal fuel rod assembly cooled by sodium. It essentially applies to bundles of bare rods and to bundles with grid type spacers. It may also be used for bundles with helical spacers, but intersubchannel transport phenomena at the edge of the bundle are not described in an entirely satisfactory way.
HERA-1A computes subchannel coolant mass flow rates, subchannel coolant enthalpies and various derived parameters of engineering interest.
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4. METHOD OF SOLUTION

The program is based on a lumped parameter approach involving subdivision of the bundle flow area into a number of parallel subchannels and characterization of the hydrodynamic and thermal conditions of the coolant in each of these subchannels by bulk average values. Hydrodynamic and thermal interactions between adjacent subchannels are described in terms of mixing coefficients. Cross flow effects are ignored and for the case of helical spacers intersubchannel heat transport is described in terms of a continuous mixing model. The mathematical solution of the coolant enthalpy differential equation system is obtained analytically via the solution of an algebraic eigenvalue problem.
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5. RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM
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6. TYPICAL RUNNING TIME

Running time is determined by the time needed  to find all eigenvalues and all eigenvectors of a matrix whose order is the number of subchannels.
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7. UNUSUAL FEATURES: UNUSUAL FEATURES OF THE PROGRAM
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8. RELATED OR AUXILIARY PROGRAMS: RELATED AND AUXILIARY PROGRAMS
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9. STATUS
Package ID Status date Status
NEA-0536/01 01-OCT-1977 Tested at NEADB
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10. REFERENCES
NEA-0536/01, included references:
- R.Nijsing, W.Eifler:
  'HERA-1A, Heat Transfer in Rod Assemblies'
  EUR 4905.E (1973).
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11. HARDWARE REQUIREMENTS: MACHINE REQUIREMENTS
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12. PROGRAMMING LANGUAGE(S) USED
Package ID Computer language
NEA-0536/01 FORTRAN-IV
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13. OPERATING SYSTEM OR MONITOR UNDER WHICH PROGRAM IS EXECUTED:  IBM 370 OS.
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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

      R. Nijsing, E. Eifler
      Joint Research Centre
      21020 - Ispra Italy
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16. MATERIAL AVAILABLE
NEA-0536/01
File name File description Records
NEA0536_01.001 HERA-1A SOURCE - F4 EBCDIC 3155
NEA0536_01.002 HERA-1A SAMPLE PROBLEM 1 DATA 14
NEA0536_01.003 HERA-1A SAMPLE PROBLEM 2 DATA 14
NEA0536_01.004 HERA-1A OVERLAY CARDS 11
NEA0536_01.005 HERA-1A SAMPLE PROBLEM 1 OUTPUT 7276
NEA0536_01.006 HERA-1A SAMPLE PROBLEM 2 OUTPUT 5613
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17. CATEGORIES
  • H. Heat Transfer and Fluid Flow

Keywords: enthalpy, flow rate, fluid flow, fuel assemblies, fuel rods, heat transfer, hexagonal configuration, sodium, steady-state conditions, thermodynamics.