NESC0666 FTA

FTA, Fault Tree Analysis for Minimal Cut Sets, Graphics for CALCOMP

NAME OR DESIGNATION OF PROGRAM, COMPUTER, DESCRIPTION OF PROBLEM OR FUNCTION, METHOD OF SOLUTION, RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM, TYPICAL RUNNING TIME, UNUSUAL FEATURES OF THE PROGRAM, RELATED AND AUXILIARY PROGRAMS, STATUS, REFERENCES, MACHINE REQUIREMENTS, LANGUAGE, OPERATING SYSTEM UNDER WHICH PROGRAM IS EXECUTED, OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS, NAME AND ESTABLISHMENT OF AUTHORS, MATERIAL, CATEGORIES

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1. NAME OR DESIGNATION OF PROGRAM: FTA

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2. COMPUTERS

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Program name	Package id	Status	Status date
FTA	NESC0666/01	Tested	01-JUN-1978

Machines used:

Package ID	Orig. computer	Test computer
NESC0666/01	CDC 7600	CDC 7600

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3. DESCRIPTION OF PROBLEM OR FUNCTION

The FTA (Fault Tree Analysis)
system  was designed  to  predict probabilities  of  the modes  of
failure  for  complex  systems  and  to  graphically  present  the
structure of  systems.  There  are three  programs in  the system.
Program  ALLCUTS   performs  the  calculations.    Program  KILMER
constructs a CalComp plot file of  the system fault tree.  Program
BRANCH builds a cross-reference list of the system fault tree.

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4. METHOD OF SOLUTION

ALLCUTS  employs  a  top-down  set  expansion
algorithm  to  find   fault  tree  cutsets  and   then  optionally
calculates  their probability  using a  currently accepted  cutset
quantification method.   The methodology is  adapted from  that in
WASH-1400 (draft), August 1974.

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5. RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM

Maxima of -
   175 basic events
   425 rate events
ALLCUTS  may be  expanded to  solve larger  problems depending  on
available core memory.

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6. TYPICAL RUNNING TIME

ALLCUTS requires 8 seconds for the sample
problem, KILMER 2 to 15 seconds depending on the number of plots
generated, and BRANCH 4 seconds.

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7. UNUSUAL FEATURES OF THE PROGRAM

ALLCUTS  uses  a   top-down  set
expansion technique to reduce a fault tree to its cutsets.  KILMER
is an  interactive program which builds  a plot file  according to
user-given instructions.

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8. RELATED AND AUXILIARY PROGRAMS:

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9. STATUS

Package ID	Status date	Status
NESC0666/01	01-JUN-1978	Tested at NEADB

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10. REFERENCES: REFERENCES

NESC0666/01, included references:

- J. Diven, D. Griffing, A. Thorpe, and W. Van Slyke,
  Fault Tree Analysis System User's Guide
  CSC-RL-SCI-122, June 26, 1975.
- W. J. Van Slyke and D. Griffing,
  ALLCUTS, A Fast, Comprehensive Fault Tree Analysis Code
  ARH-ST-112, July 1975.

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11. MACHINE REQUIREMENTS

110K (octal) words for ALLCUTS, 65K (octal)
words for KILMER, and 50K (octal) words for BRANCH

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12. PROGRAMMING LANGUAGE(S) USED

Package ID	Computer language
NESC0666/01	FORTRAN+ASSEMBLER

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13. OPERATING SYSTEM UNDER WHICH PROGRAM IS EXECUTED: SCOPE 3.4.2.

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14. OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS:

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15. NAME AND ESTABLISHMENT OF AUTHORS

                 W. J. Van Slyke and D. E. Griffing
                 Atlantic Richfield Hanford Company
                 P. O. Box 250
                 Richland, Washington  99352
                 J. Diven
                 Computer Sciences Corporation
                 825 Jadwin Avenue
                 Richland, Washington  99352

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16. MATERIAL AVAILABLE

NESC0666/01

File name	File description	Records
NESC0666_01.001	INFORMATION	4
NESC0666_01.002	ALLCUTS - SOURCE PROGRAM (F4)	1312
NESC0666_01.003	KILMER - SOURCE PROGRAM (F4 + COMPASS)	2171
NESC0666_01.004	BRANCH - SOURCE PROGRAM (F4)	222
NESC0666_01.005	SAMPLE PROBLEM INPUT DATA	59
NESC0666_01.006	ALLCUTS - PRINTED OUTPUT	574
NESC0666_01.007	BRANCH - PRINTED OUTPUT	68

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17. CATEGORIES

G. Radiological Safety, Hazard and Accident Analysis
P. General Mathematical and Computing System Routines

Keywords: computer graphics, fault tree analysis, numerical solution, statistics.