Computer Programs
NEA-0575 STESTA.
last modified: 28-JUN-1982 | catalog | categories | new | search |

NEA-0575 STESTA.

STESTA, Steady-State State-Variable Profiles of Thermohydraulic Piping System

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1. NAME OR DESIGNATION OF PROGRAM:  STESTA.
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2. COMPUTERS
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Program name Package id Status Status date
STESTA NEA-0575/01 Tested 01-FEB-1980
STESTA NEA-0575/02 Tested 28-JUN-1982

Machines used:

Package ID Orig. computer Test computer
NEA-0575/01 CDC 7600 CDC 7600
NEA-0575/02 IBM 3033 IBM 3033
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3. NATURE OF PHYSICAL PROBLEM SOLVED

STESTA is used to calculate steady-state profiles of the state variables of thermohydraulic piping networks. It can be applied to hydrodynamically or thermodynamically coupled or uncoupled multi-loop complex piping networks, filled with any single-phase or  two-phase fluid.
Hydraulic losses are considered, continously as well as resulting from abrupt geometry changes. For the analysis of closed-loop behaviour, the code contains a pump model based on (q,h)- characteristics.
To the IBM version the possibility of specifying the hydraulic dia-  meter for the volumes and junctions was added. This enables the treatment of annular sections, bundles of pipes, contracted multiple loops.
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4. METHOD OF SOLUTION

The code considers the thermohydraulic steady-state balance equations for momentum, mass and energy and iterates them for consistent state profiles for pressure, temperature and mass flow, based on boundary values needed for every uncoupled sub-system. Sources and sinks of heat and mass fluxes are also taken into  account.
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5. RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM

The present version of STESTA has the following restrictions:
Maximum number of volumes                           50
Maximum number of junctions                         50
Maximum number of distinct hydrodynamic  loops       5
Maximum number of different fluid media              5
Maximum number of different pumps                    5
Maximum number of different pump characteristics     5
Any of these restrictions can be extended by internal adaption of the respective DIMENSION statements.
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6. TYPICAL RUNNING TIME

To compile and execute the sample problem: 14 seconds of CPU time (CYBER 175). NEA-DB executed the test case on IBM 3033 in 17 seconds.
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7. UNUSUAL FEATURES OF THE PROGRAM

STESTA was written to calculate the steady-state profiles required by transient programs such as RELAP4 and WHAM. The code allows a free-formatted data input in either 'American' or SI-units and gives extensive input assistance,  especially in the case of systematically structured  networks.
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8. RELATED AND AUXILIARY PROGRAMS

The basic equations are tightly fit to the respective equations in the RELAP4 code, so a full compatibility  is accomplished.
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9. STATUS
Package ID Status date Status
NEA-0575/01 01-FEB-1980 Tested at NEADB
NEA-0575/02 28-JUN-1982 Tested at NEADB
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10. REFERENCES
NEA-0575/01, included references:
- H.J. Schittke:
  Input Description for 'STESTA'
  17.1.1979. (in German).
NEA-0575/02, included references:
- H.J. Schittke:
  Input Description for 'STESTA'
  17.1.1979. (in German).
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11. MACHINE REQUIREMENTS

100000 (octal) words (CDC computers).
300 Kbytes on IBM 3033.
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12. PROGRAMMING LANGUAGE(S) USED
Package ID Computer language
NEA-0575/01 FORTRAN-IV
NEA-0575/02 FORTRAN-IV
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13. OPERATING SYSTEM OR MONTIRO UNDER WHICH PROGRAM IS EXECUTED:  NOS1 (CDC CYBER 175). OS370/033 VS2 03.8G (IBM 3033).
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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

H.J. Schittke
Industrianlagen-Betriebsgesellschaft MBH
Einsteinstrasse
D-8012 Ottobrunn
The Federal Republic of Germany
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16. MATERIAL AVAILABLE
NEA-0575/01
File name File description Records
NEA0575_01.001 INFORMATION , JCL 22
NEA0575_01.002 SOURCE (F4,EBCDIC) 3739
NEA0575_01.003 INPUT DATA FOR S. P. 26
NEA0575_01.004 PRINTED OUT OF S. P. 514
NEA-0575/02
File name File description Records
NEA0575_02.003 STESTA INFORMATION FILE 63
NEA0575_02.004 STESTA, SOURCE CARD IMAGES (FORTRAN-4) 3919
NEA0575_02.006 STESTA, INPUT FOR SAMPLE CASE 34
NEA0575_02.007 STESTA, PRINTED OUTPUT OF SAMPLE CASE 724
NEA0575_02.008 STESTA, JCL TO RUN SAMPLE CASE 69
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17. CATEGORIES
  • G. Radiological Safety, Hazard and Accident Analysis

Keywords: fluid flow, hydraulics, iterative methods, pipes, reactor safety, steady-state conditions, thermodynamics.