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NEA-0802 OWEN-1.

OWEN-1, LOCA Transient and Steady-State 2 Phase Flow in Heated Channel

NAME OR DESIGNATION OF PROGRAM, COMPUTER, NATURE OF PHYSICAL PROBLEM SOLVED, 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 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:  OWEN-1.
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2. COMPUTERS
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Program name Package id Status Status date
OWEN-1 NEA-0802/01 Tested 01-SEP-1976

Machines used:

Package ID Orig. computer Test computer
NEA-0802/01 IBM 370 series IBM 370 series
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3. NATURE OF PHYSICAL PROBLEM SOLVED

The transient (including LOCA) and steady state flow of two-phase compressible light water in a single heated channel. The momentum flux term is included and unequal phase velocities are allowed. A lumped fuel model and detailed surface transfer are included. Thermodynamic equilibrium of the two phases is assumed at each axial location. Either Fauske or Moody choke flow model may be used.
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4. METHOD OF SOLUTION

The one-dimensional conservation equations of mass, momentum and energy are solved by a numerically stable implicit finite difference scheme.
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5. RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM

Maximum of 50 axial nodes. There is one lumped fuel node at each axial node.
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6. TYPICAL RUNNING TIME

A blowdown problem with 25 nodes takes about two minutes on an IBM 360/65.
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7. UNUSUAL FEATURES OF THE PROGRAM

The numerical scheme is stable for all time step sizes so the time step size can be chosen on accuracy considerations alone giving much shorter computation times. Unequal phase velocities are allowed giving a more accurate representation.
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8. RELATED AND AUXILIARY PROGRAMS

The equation of state tables have been generated by the ASTEM (ANCR-1026) code.
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9. STATUS
Package ID Status date Status
NEA-0802/01 01-SEP-1976 Tested at NEADB
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10. REFERENCES

- W.J. Turner:
  AAEC/E342 (1975)
- W.J. Turner:
  Energia Nucleare 19 (5) 317 (1972)
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11. MACHINE REQUIREMENTS: 224k bytes main storage; on-line punch and printer; clock.
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12. PROGRAMMING LANGUAGE(S) USED
Package ID Computer language
NEA-0802/01 FORTRAN+ASSEMBLER
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13. OPERATING SYSTEM OR MONITOR UNDER WHICH PROGRAM IS EXECUTED:  IBM360 OS MVT.
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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

    W.J. Turner:
    Australian Atomic Energy Commission Research Establishment
    Private Mail Bag
    Sutherland, N.S.W. 2232
    Australia
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16. MATERIAL AVAILABLE
NEA-0802/01
File name File description Records
NEA0802_01.001 INFORMATION 16
NEA0802_01.002 SOURCE PROGRAM (F4) EBCDIC 1870
NEA0802_01.003 SOURCE PROGRAM (ASSEMBLER) EBCDIC 46
NEA0802_01.004 DD CARDS + SAMPLE PROBLEM INPUT DATA 49
NEA0802_01.005 LIBRARY DATA (BINARY) 57
NEA0802_01.006 SAMPLE PRINTED OUTPUT (THROUGH UNIT 3) 249
NEA0802_01.007 SAMPLE PRINTED OUTPUT (THROUGH UNIT 10) 47
NEA0802_01.008 SAMPLE PROBLEM PUNCHED OUTPUT 29
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17. CATEGORIES
  • H. Heat Transfer and Fluid Flow

Keywords: blowdown, compressible flow, finite difference method, heat transfer, loss-of-coolant accident, transients, two-phase flow.