Computer Programs

NEA-0536 HERA-1A.

NEA-0536 HERA-1A.

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

NAME OR DESIGNATION OF PROGRAM, COMPUTER, NATURE OF PHYSICAL PROBLEM SOLVED, METHOD OF SOLUTION, RESTRICTIONS, TYPICAL RUNNING TIME, FEATURES, AUXILIARIES, STATUS, REFERENCES, 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: 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.