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NEA-0429 REMO.

REMO, Failure Analysis of System with Reparable and Standby Components by Monte-Carlo

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1. NAME OR DESIGNATION OF PROGRAM:  REMO.
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2. COMPUTERS
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Program name Package id Status Status date
REMO NEA-0429/01 Tested 01-OCT-1975

Machines used:

Package ID Orig. computer Test computer
NEA-0429/01 IBM 370 series IBM 370 series
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3. NATURE OF PHYSICAL PROBLEM SOLVED

The program REMO calculates the overall reliability of a system using the reliability parameters of  its elementary components.
Systems formed by reparable and standby components in any mixture can be treated with REMO. Furthermore, due to the fact that the standby effect is treated in an open subroutine the user can obtain  a good approximation to the real case at the cost of some programming work.
     The results of a REMO run are:
(a) The probability that the system fails before a fixed time.
(b) The list of the more frequent minimal cut sets.
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4. METHOD OF SOLUTION

The code uses a sort of Monte Carlo simulation in order to generate a large statistics of system failures.
The logical connection of the events is described by a conventional fault tree. One of the two different types of importance sampling can be brought in action by the user in the case that simple analogue simulation is very insufficient. Details of these variance reducing devices are given and discussed in the report.
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5. RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM

The maximum number of components is 100. The failure law assigned to each component can be of the exponential or Weibull type. The repair times can be assumed  constant or random distributed with an exponential law. Each component, when repaired, must be considered good as new. No restart device is implemented in order to save the partial results if execution time is too long for a single run on the computer.
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6. TYPICAL RUNNING TIME
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7. UNUSUAL FEATURES: UNUSUAL FEATURES OF THE PROGRAM
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8. RELATED OR AUXILIARY PROGRAMS: RELATED AND AUXILIARY PROGRAMS
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9. STATUS
Package ID Status date Status
NEA-0429/01 01-OCT-1975 Tested at NEADB
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10. REFERENCES

- R. Ricchena:
  'Description and Use of the Program REMO',
  in

  'The Monte Carlo Approach in Fault-Tree Analysis'
  Ispra Courses on Reliability Engineering
  'System Reliability'
  May 5-9, 1975.
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11. HARDWARE REQUIREMENTS: MACHINE REQUIREMENTS
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12. PROGRAMMING LANGUAGE(S) USED
Package ID Computer language
NEA-0429/01 FORTRAN-IV
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13. OPERATING SYSTEM OR MONITOR UNDER WHICH PROGRAM IS EXECUTED:  IBM 370/OS.
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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:     R. Ricchena, CCR EURATOM, Ispra, Italy.
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16. MATERIAL AVAILABLE
NEA-0429/01
File name File description Records
NEA0429_01.001 SOURCE PROGRAM (F4) EBCDIC 594
NEA0429_01.002 TREE SUBROUTINE (F4) FOR SAMPLE PROBLEM 18
NEA0429_01.003 JCL 11
NEA0429_01.004 REMO SAMPLE PROBLEM DATA 16
NEA0429_01.005 REMO SAMPLE PROBLEM PRINTED OUTPUT 214
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17. CATEGORIES
  • G. Radiological Safety, Hazard and Accident Analysis
  • P. General Mathematical and Computing System Routines

Keywords: Monte Carlo method, fault tree analysis, reliability, system failure analysis.