Development of import module for event trees in RiskA;

By means of probability theory and event tree analysis, fire growth probability and critical time of every phase are calculated.

Based on the characteristics of initial events and preliminary analysis to all initial events sequence, the all of event trees to be founded for the probabilistic safety (assessment)(PSA) document, the function event of each event tree and the classification to the consequences of event sequences were defined for China Experimental Fast Reactor(CEFR) probabilistic safety assessment level I.

Calculating the cost of fire detection system according to it's components' cost and uses event-tree and simulation methods to estimate its benefit.

For this reason,in this paper the tree relevance structure of event-tide is researched and the filtering strategy based on event-tree model is proposed.

Moreover,the event-tree index system which contends event relations and restrictions is established.

The event-tree method is a universal method of the dam risk analysis at present.

A time-related event tree approach presented in the paper is one of them.

According to the deficiency of event tree analysis in safety evaluation,this paper introduces a dynamic event tree analysis method and the mathematical description is given as well.