This manual describes the use of the Set Equation Transformation System (SETS) for fault tree analysis. An algebraic minimal cut set algorithm is presented which determines all of the fundamental ways that an intermediate event can occur. A direct implementation of the algorithm using SETS is adequate for small fault trees, but for large fault trees several techniques are presented which increase the efficiency of the algorithm. These techniques include-the separate processing of independent subtrees and the derivation of an equation in stages. The truncation of an equation to retain only those minimal cut sets with n or fewer components is also described.
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