PAFT F77, Program for the Analysis of Fault Trees

PAFT F77, a program for the analysis of fault trees, is coded in Fortran 77. Given the structure of a fault tree and the probability or failure rates of its basic events, PAFT F77 calculates the probabilities of the top and all intermediate events, as well as the marginal importance of all basic events. When the input is in terms of failure rates instead of probabilities, the marginal occurrence rates of all basic events and the occurrence rate of the top event are also calculated. The program is designed to handle simple fault trees and those with replicated basic events. Discussion of the program's ability and limitations together with a brief theoretical review of fault-tree analysis are presented.