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NEA-0861 AWE-1, AWE-2, BRUNA.

AWE-1 AWE-2 BRUNA, Minimal Cut Sets of Logic Trees

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1. NAME OR DESIGNATION OF PROGRAM:  AWE-1, AWE-2, BRUNA.
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2. COMPUTERS
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Program name Package id Status Status date
AWE-1 NEA-0861/01 Tested 20-OCT-1982
AWE-2 NEA-0861/02 Tested 20-OCT-1982
BRUNA NEA-0861/03 Tested 20-OCT-1982

Machines used:

Package ID Orig. computer Test computer
NEA-0861/01 IBM 3033 IBM 3033
NEA-0861/02 IBM 3033 IBM 3033
NEA-0861/03 IBM 3033 IBM 3033
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3. DESCRIPTION OF PROBLEM OR FUNCTION

The programs carry out the analysis of AND/OR logic trees, determining the minimal significant  cut sets, permitting therefore the fixing of a minimum limit on the  unavailability and unreliability of the cut sets being determined.
For each cut set the unavailability, unreliability and weight are calculated together with the unavailability and unreliability of the entire system.
   AWE-2 uses a bound method to calculate the unavailability.
The primary events of the system can have a constant probability or  an exponential failure law, with or without repair, and may eventually be put under periodic control.
The program BRUNA allows as the parameters of the primary events, not only a single value but a distribution of values. A histogram of the unavailability and reliability of the system is determined.
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4. METHOD OF SOLUTION:
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5. RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM:
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6. TYPICAL RUNNING TIME

To run the test cases at NEA-DB, the following execution times were required:
BRUNA:   20 seconds
AWE-1:   31 seconds
AWE-2:    1 second.
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7. UNUSUAL FEATURES OF THE PROGRAM:
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8. RELATED AND AUXILIARY PROGRAMS:
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9. STATUS
Package ID Status date Status
NEA-0861/01 20-OCT-1982 Tested at NEADB
NEA-0861/02 20-OCT-1982 Tested at NEADB
NEA-0861/03 20-OCT-1982 Tested at NEADB
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10. REFERENCES

- A.G. Colombo, G. Volta
  Sensitivity Analysis in System Reliability Evaluation,
  Eur 5260e - Annual Report 1973.
- M. Astolfi
  Disponibilita media di sistemi parallelo composti da elementi
  soggetti a guasto con legge esponenziale e a test periodici,
  Nota Tecnica P.E.R. 019.
- M. Astolfi
  Disponibilita media di sistemi parallelo composti da elementi
  soggetti a guasto con legge esponenziale e a test periodici:
  Caso di paralleli di ordine superiore a 4,
  Nota tecnica P.E.R. 060.
NEA-0861/01, included references:
- M. Astolfi:
  Programs AWE-1, AWE-2 and BRUNA for the Calculation of Systems
  Reliability and Availability
  EUR 5638.e (August 1976).
NEA-0861/02, included references:
- M. Astolfi:
  Programs AWE-1, AWE-2 and BRUNA for the Calculation of Systems
  Reliability and Availability
  EUR 5638.e (August 1976).
NEA-0861/03, included references:
- M. Astolfi:
  Programs AWE-1, AWE-2 and BRUNA for the Calculation of Systems
  Reliability and Availability
  EUR 5638.e (August 1976).
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11. MACHINE REQUIREMENTS

Main storage:  BRUNA   300 kbytes
                                       AWE-1  200 kbytes
                                       AWE-2  200 kbytes.
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12. PROGRAMMING LANGUAGE(S) USED
Package ID Computer language
NEA-0861/01 FORTRAN-IV
NEA-0861/02 FORTRAN-IV
NEA-0861/03 FORTRAN-IV
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13. OPERATING SYSTEM UNDER WHICH PROGRAM IS EXECUTED:
OS370/033 (IBM 3033).
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14. OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS:
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15. NAME AND ESTABLISHMENT OF AUTHOR

M. Astolfi
Commission of the European Communities
Joint Research Centre
ISPRA Estalishment, Italy
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16. MATERIAL AVAILABLE
NEA-0861/01
File name File description Records
NEA0861_01.003 AWE-1 INFORMATION FILE 19
NEA0861_01.004 AWE-1 SOURCE (FORTRAN-4) 983
NEA0861_01.005 AWE-1 INPUT FOR TEST CASE 73
NEA0861_01.006 AWE-1 OUTPUT OF TEST CASE 479
NEA0861_01.007 AWE-1 JCL FOR TEST CASE 11
NEA-0861/02
File name File description Records
NEA0861_02.003 AWE-2 INFORMATION FILE 19
NEA0861_02.004 AWE-2 SOURCE (FORTRAN-4) 953
NEA0861_02.005 AWE-2 INPUT FOR TEST CASE 13
NEA0861_02.006 AWE-2 OUTPUT OF TEST CASE 217
NEA0861_02.007 AWE-2 JCL FOR TEST CASE 11
NEA-0861/03
File name File description Records
NEA0861_03.003 BRUNA INFORMATION FILE 19
NEA0861_03.004 BRUNA SOURCE (FORTRAN-4) 1621
NEA0861_03.005 BRUNA INPUT FOR TEST CASE 66
NEA0861_03.006 BRUNA OUTPUT OF TEST CASE 734
NEA0861_03.007 BRUNA JCL FOR TEST CASE 11
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17. CATEGORIES
  • G. Radiological Safety, Hazard and Accident Analysis
  • P. General Mathematical and Computing System Routines

Keywords: fault tree analysis, reliability, system failure analysis.