Hazard Analyses

DOE-STD -3009-94

Figure 3-1 identifies the specific point where the analyst must move beyond the

general outline of this Standard and use the graded approach to specifically

determine appropriate hazard analysis methodology. Application of a graded

approach is based on the judgment and experience of the analysts and results in the

selection of a hazard evaluation technique such as Preliminary Hazard Analysis

(PHA), HAZOP, etc. As previously noted, more elaborate techniques will

generally be associated with more complex processes. Experience and capabilities

of analysts are also a major consideration in efficient performance of a

comprehensive hazard evaluation.

Systematic application of the chosen techniques to the operations in a facility

generates a number of basic accidents based on types of events and system

performance in response to the events. These accidents can be binned in

accordance with predefined consequence and frequency ranking thresholds.

Products of the hazard evaluation include:

Identification of planned design and operational safety improvements.

Summary of defense in depth including identification of safety-significant

SSCs and other items needing TSR coverage, including relevant programs

covered under TSR administrative controls.

Summary of significant worker protection features including identification

of safety-significant SSCs and relevant programs covered under TSR

administrative controls.

Summary of design and operational features that reduces the potential for

large material releases to the environment.

Selection of a limited set of bounding accidents (i.e., DBAs) to be further

developed in Section 3.4, "Accident Analysis."

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