Analytical trees constructing

Analytical tree construction can be accomplished with only seven different symbols, even though some programs like MORT include a few other special purpose symbols. 

Buys, R. J. Standardization Guide for Construction and Use ofMORT-Type Analytical Trees. Idaho Falls, ID System Safety Development Center. Idaho National Engineering Laboratory 1977. (ERDA 76-45/8)... 

There are seven basic steps in constructing an analytical tree. 

To construct an analytical tree, the first thing to be done is to define the top event. For an objective or positive tree, define what you want to design, build. 

Analytical trees make excellent project description documents because they are relatively easy to construct and easy to understand. Many end users and some safety professionals, engineers, and managers are not skilled in reading blueprints, electrical schematics, or other technical documents. The analytical too is an excellent means for communicating project information within a system safety working group. 

Construct an analytical tree. The tree can be on any subject and either a positive tree or a negative tree. Include at least four tiers in its longest branch, not including the top event as a tier. 

SSDC 5 Reported Significant Observation (RSO) Studies SSDC 6 Training as Related to Behavioral Change SSDC 7B DOE Guide to the Classification of Recordable Accidents SSDC 8 Standardization Guide for Construction and Use of MORT Type Analytic Trees... 

Once the data are collected and a topology constructed, it is necessary to evaluate the reliability of those data and the supported tree. It is important to keep in mind that even randomly generated data can lead to a single, best result. Therefore, several methods exist for testing the robustness of the final topology using analytical and resampling procedures (Table V). 

The process can be disaggregated with analytical tools —such as fault trees, event trees, and various stochastic models— into subprocesses, for which good statistical evidence is available. Aggregate probabilities can then be constructed. No good data are available for the process under consideration, but good data are available for a similar process and these data may be adapted or extended for use either directly or as part of a disaggregated model. 

As stated earlier, two types of fault trees will be constructed to demonstrate the use of this system safety analytical technique. The first, which will be referred to as a positive fault tree analysis, will identify the events necessary to achieve a top desired event of no accidents. The second, or negative fault tree, will be constructed to show those events or conditions that will lead to a top undesired event of a fire in a manufacturing facility. 

As stated earlier, two types of fault trees will be constructed to demonstrate the use of this system safety analytical technique. The first, which will be referred to as a... 

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