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NESC1020 BACFIRE.

BACFIRE, Minimal Cut Sets Common Cause Failure Fault Tree Analysis

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1. NAME OR DESIGNATION OF PROGRAM:  BACFIRE.
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2. COMPUTERS
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Program name Package id Status Status date
BACFIRE NESC1020/01 Tested 21-JUL-1983

Machines used:

Package ID Orig. computer Test computer
NESC1020/01 IBM 3081 IBM 3081
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3. DESCRIPTION OF PROBLEM OR FUNCTION

BACFIRE, designed to aid in common cause failure analysis, searches among the basic events of a  minimal cut set of the system logic model for common potential causes of failure. The potential cause of failure is called a qualitative failure characteristics. The algorithm searches qualitative failure characteristics (that are part of the program input) of the basic events contained in a set to find those characteristics common to all basic events. This search is repeated  for all cut sets input to the program. Common cause failure analysis is thereby performed without inclusion of secondary failure in the system logic model. By using BACFIRE, a common cause failure analysis can be added to an existing system safety and reliability analysis.
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4. METHOD OF SOLUTION

BACFIRE searches the qualitative failure characteristics of the basic events contained in the fault tree minimal cut set to find those characteristics common to all basic events by either of two criteria. The first criterion can be met if all the basic events in a minimal cut set are associated by a condition which alone may increase the probability of multiple component malfunction. The second criterion is met if all the basic  events in a minimal cut set are susceptible to the same secondary failure cause and are located in the same domain for that cause of secondary failure.
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5. RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM

Maxima of -
1001 secondary failure maps
101 basic events
  10 cut sets
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6. TYPICAL RUNNING TIME

NESC executed the sample problem in less than 1 CPU second on an IBM 370/195.
NEA-DB executed the test case on IBM 3081 in 1 CPU second.
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7. UNUSUAL FEATURES OF THE PROGRAM:
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8. RELATED AND AUXILIARY PROGRAMS

BACFIRE is similar to COMCAN (NESC Abstract 704), another common cause failure analysis program.
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9. STATUS
Package ID Status date Status
NESC1020/01 21-JUL-1983 Tested at NEADB
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10. REFERENCES

- G.R. Burdick, N.H. Marshall, J.R. Wilson:
  COMCAN - A Computer Program for Common Cause Analysis
  ANCR-1314, May 1976.
- W.E. Vesely, R.E. Narum:
  PREP and KITT: Computer Codes for the Automatic Evaluation of a
  Fault Tree
  IN-1349, August 1970.
- J.B. Fussell, E.B. Henry, N.H. Marshall:
  MCCUS: A Computer Program to Obtain Minimal sets from Fault Trees
  ANCR-1156, August 1974.
- J.B. Fussell, D.M. Rasmuson, J.R. Wilson, G.R. Burdick,
  J.C. Zipperer:
  A Collection of Methods for Reliability and Safety Engineering
  ANCR-1273, April 1976.
NESC1020/01, included references:
- C.L. Cate and J.B. Fussel:
  A Computer Program for Common Cause Failure Analysis
  BACFIRE (February 1977).
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11. MACHINE REQUIREMENTS:  130K bytes of memory are required for execution.
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12. PROGRAMMING LANGUAGE(S) USED
Package ID Computer language
NESC1020/01 FORTRAN-IV
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13. OPERATING SYSTEM UNDER WHICH PROGRAM IS EXECUTED:  OS/MVT.
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14. OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS:
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15. NAME AND ESTABLISHMENT OF AUTHOR

                  J.B. Fussell
                  JBF Associates, Inc.
                  Technology Drive
                  1000 Technology Park Center
                  Knoxville, Tennessee 37932, U. S. A.
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16. MATERIAL AVAILABLE
NESC1020/01
File name File description Records
NESC1020_01.003 BACFIRE INFORMATION FILE 33
NESC1020_01.004 BACFIRE SOURCE (FORTRAN-4) 615
NESC1020_01.005 BACFIRE JCL FOR TEST CASE 22
NESC1020_01.006 BACFIRE INPUT FOR TEST CASE 95
NESC1020_01.007 BACFIRE OUTPUT OF TEST CASE 209
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17. CATEGORIES
  • G. Radiological Safety, Hazard and Accident Analysis

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