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

NEA-0453 DEPCO-MULTI.

DEPCO-MULTI, Subcooled Decompression in PWR Primary System LOCA

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1. NAME OR DESIGNATION OF PROGRAM:  DEPCO-MULTI.
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2. COMPUTERS
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Program name Package id Status Status date
DEPCO-MULTI NEA-0453/01 Tested 01-NOV-1977

Machines used:

Package ID Orig. computer Test computer
NEA-0453/01 IBM 370 series IBM 370 series
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3. NATURE OF PHYSICAL PROBLEM SOLVED

DEPCO-MULTI is used to analyze the subcooled decompression in a multiple pipe netork such as a PWR  primary coolant system after an instantaneous pipe break.
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4. METHOD OF SOLUTION

The unsteady one dimensional mass, momentum and  energy conservation laws are converted to a set of compatibility conditions and characteristic directions equivalent to them. After the simplification of the compatibility conditions, they are numerically integrated by the explicit formula.
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5. RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM

(1) Maximum number of different thermodynamic initial conditions - 5 (2) Maximum output points of - pressure history - 5
                               pressure difference history - 3
                               flow velocity history - 1
(3) The assumptions of thermal equilibrium, no buoyancy effect, no heat transfer and one-dimensional analysis are used.
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6. TYPICAL RUNNING TIME

About 823 seconds of CPU time are required for the typical case which has 661 mesh points and 35 msec time interval. The total time step number is 916.
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7. UNUSUAL FEATURES OF THE PROGRAM

(1) The running time is short because of the simplification of the isentropic processes.
(2) The method of characteristics has the advantage of being closely     related to the pressure wave transport phenomena.
(3) The heat transfer coefficients which are important in the core heat transfer analysis during LOCA could be calculated locally     because the velocity distribution in the core can be obtained.
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8. RELATED AND AUXILIARY PROGRAMS

The program GPLOT1 is used to plot the result calculated by DEPCO-MULTI. The program steam is suited to calculate the steam tables based on JSME steam tables.
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9. STATUS
Package ID Status date Status
NEA-0453/01 01-NOV-1977 Tested at NEADB
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10. REFERENCES
NEA-0453/01, included references:
- K. Namatame and K. Kobayashi:
  Digital Computer Code DEPCO-MULTI for Calculating the Subcooled
  Decompression in PWR LOCA
  JAERI-M 5623 (February 1974).
- K. Namatame and K. Kobayashi:
  Subcooled Decompression Analysis of The Rosa and The Loft
  Semiscale Blowdown Test Data by the Digital Computer Code
  DEPCO-MULTI
  JAERI-M 6340 (December 1975).
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11. HARDWARE REQUIREMENTS

MACHINE REQUIREMENTS. About 120k words main storage, 11 data files,  plotter.
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12. PROGRAMMING LANGUAGE(S) USED
Package ID Computer language
NEA-0453/01 FORTRAN-IV
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13. OPERATING SYSTEM OR MONITOR UNDER WHICH PROGRAM IS EXECUTED:  Monitor V of FACOM 230/60.
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14. ANY OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS

All subroutines which are not included refer to GSSL (Genken subroutine  library) and should be included in other systems.
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15. NAME AND ESTABLISHMENT OF AUTHOR

    K. Namatame and K. Kobayashi
    Japan Atomic energy Research Institute
    Tokai-Mura, Naka-Gun, Ibaraki-Ken
    Japan.
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16. MATERIAL AVAILABLE
NEA-0453/01
File name File description Records
NEA0453_01.001 INFORMATION 4
NEA0453_01.002 LIBRARY DATA IN BCD FORM ( SATZ) 1448
NEA0453_01.003 LIBRARY DATA IN BCD FORM ( WATF) 24980
NEA0453_01.004 LIBRARY DATA IN BCD FORM ( WATG) 11070
NEA0453_01.005 LIBRARY CONV. PROG. (BCD TO BINARY - SATZ) 12
NEA0453_01.006 LIBRARY CONV. PROG. (BCD TO BINARY - WATF&G) 23
NEA0453_01.007 JCL OF THE CONVERSION PROGRAMS 6
NEA0453_01.008 SOURCE PROGRAM - F4 - EBCDIC 3800
NEA0453_01.009 PLOTTING ROUTINES - F4 - EBCDIC 415
NEA0453_01.010 JCL 30
NEA0453_01.011 SAMPLE PROBLEM INPUT DATA 59
NEA0453_01.012 SAMPLE PROBLEM PRINTED OUTPUT 1338
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17. CATEGORIES
  • G. Radiological Safety, Hazard and Accident Analysis

Keywords: coolant loops, loss-of-coolant accident, pipes, pwr reactors, thermodynamics.