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

1. NAME OR DESIGNATION OF PROGRAM:  AWE-1, AWE-2, BRUNA.

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.

4. METHOD OF SOLUTION:

5. RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM:

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.

7. UNUSUAL FEATURES OF THE PROGRAM:

8. RELATED AND AUXILIARY PROGRAMS:

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.

- M. Astolfi:
  Programs AWE-1, AWE-2 and BRUNA for the Calculation of Systems
  Reliability and Availability
  EUR 5638.e (August 1976).
- M. Astolfi:
  Programs AWE-1, AWE-2 and BRUNA for the Calculation of Systems
  Reliability and Availability
  EUR 5638.e (August 1976).
- M. Astolfi:
  Programs AWE-1, AWE-2 and BRUNA for the Calculation of Systems
  Reliability and Availability
  EUR 5638.e (August 1976).

11. MACHINE REQUIREMENTS

Main storage:  BRUNA   300 kbytes
                                       AWE-1  200 kbytes
                                       AWE-2  200 kbytes.

13. OPERATING SYSTEM UNDER WHICH PROGRAM IS EXECUTED:
OS370/033 (IBM 3033).

14. OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS:

15. NAME AND ESTABLISHMENT OF AUTHOR

M. Astolfi
Commission of the European Communities
Joint Research Centre
ISPRA Estalishment, Italy

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

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

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