last modified: 01-JUN-1977 | catalog | categories | new | search |

NEA-0806 NAIAD.

NAIAD, LOCA Transient and Steady-State 2 Phase Flow in Channel Network

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1. NAME OR DESIGNATION OF PROGRAM:  NAIAD.
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2. COMPUTERS
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Program name Package id Status Status date
NAIAD NEA-0806/01 Tested 01-JUN-1977

Machines used:

Package ID Orig. computer Test computer
NEA-0806/01 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 network of heated channels. The momentum flux term is included and unequal phase velocities allowed. A lumped fuel model and detailed surface heat transfer are included. Thermodynamic equilibrium of the two phases is assumed. Discharge flow is calculated intrinsically from the hydraulic equations. The ANC pump model is included.
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4. METHOD OF SOLUTION

The one-dimensional conservation equations of mass, momentum and energy are solved in each channel by a numerically stable implicit finite difference scheme. The network is then solved by an accelerated Gauss-Seidel iteration scheme.
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5. RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM

Versions of the code  can be easily generated to handle any size problem. Standard code is limited to 50 axial nodes and 10 channels.
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6. TYPICAL RUNNING TIME

Depends on complexity of the problem. Approximately 15 milliseconds per time step per node on model 65 CPU. Sample problem takes 1 minute on model 65.
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7. UNUSUAL FEATURES OF THE PROGRAM

The code user may supply special routines to set up and dynamically modify boundary conditions. These routines can also be used to control time-stepping, write supplementary output and model hydraulic components not routinely allowed for in the standard code.
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8. RELATED AND AUXILIARY PROGRAMS

Four supplementary programs are provided:
(a) A precompiler to expand common blocks in the MAIN code and the user's special routines.
(b) A prelinker to insert ALIAS and NAME cards into object modules for subroutine library creation.
(c) A program to generate steam tables for the code.
(d) A program to load pump characteristic data.
The steam table generating program requires the ASTEM package (ANCR-1026).
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9. STATUS
Package ID Status date Status
NEA-0806/01 01-JUN-1977 Tested at NEADB
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10. REFERENCES: - G.D. Trimble and W.J. Turner:, AAEC/E378 (1976).
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11. MACHINE REQUIREMENTS:  240 kbytes main storage. 132 column printer.
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12. PROGRAMMING LANGUAGE(S) USED
Package ID Computer language
NEA-0806/01 FORTRAN+ASSEMBLER
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13. OPERATING SYSTEM OR MONITOR UNDER WHICH PROGRAM IS EXECUTED:  IBM 360 O.S. MVT.
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14. ANY OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS

The FORTRAN system message data set is assumed to be unit 3.
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15. NAME AND ESTABLISHMENT OF AUTHOR

      G.D. Trimble and 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-0806/01
File name File description Records
NEA0806_01.001 INFORMATION 15
NEA0806_01.002 PROCEDURES 196
NEA0806_01.003 JOB CONTROL FOR NAIAD 75
NEA0806_01.004 PRELINKER 214
NEA0806_01.005 LIBRARY ROUTINES - ASSEMBLER 2888
NEA0806_01.006 LIBRARY ROUTINES - F4 69
NEA0806_01.007 PRECOMPILER SOURCE - F4 64
NEA0806_01.008 COMMONS 50/10 72
NEA0806_01.009 COMMONS 100/20 72
NEA0806_01.010 NAIAD SOURCE - F4 2405
NEA0806_01.011 SSGEN SOURCE 348
NEA0806_01.012 ASTEM SUBROUTINES - F4 1551
NEA0806_01.013 SSGEN SAMPLE PROBLEM INPUT 18
NEA0806_01.014 SSGEN SAMPLE PROBLEM OUTPUT 25
NEA0806_01.015 PUMPLOAD SOURCE - F4 37
NEA0806_01.016 PUMPLOAD SAMPLE PROBLEM INPUT 106
NEA0806_01.017 PUMPLOAD SAMPLE PROBLEM OUTPUT 118
NEA0806_01.018 NAIAD SAMPLE PROBLEM INPUT 141
NEA0806_01.019 NAIAD SAMPLE PROBLEM OUTPUT 373
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17. CATEGORIES
  • G. Radiological Safety, Hazard and Accident Analysis

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