Risk Assessment Code preliminary hazard analysis

Preliminary Hazard Analysis Description. The incorporation of this information into a PHA entry is shown as Table II. This entry describes the proposed actions needed to eliminate or control the hazard (column 6), the risk assessment code assigned after controls (column 7), and the identification of applicable codes and standards (column 8). 

Very little real analysis is completed during the concept phase because analysis detail and data are generally not available. A preliminary risk assessment code (RAC) is determined, however, as part of the preliminary hazard list. This initial RAC is used to aid in determining the initial scope of the system safety effort and in the early evaluation of alternative designs and approaches. 

A written communication accompanies the analysis, explaining the assumptions made and the rationale for them. Comments would then be made on the assignment of responsibilities for the remedial actions to be taken and when. A Hazard Analysis and Risk Assessment Worksheet (formerly called a Preliminary Hazard Analysis Worksheet) appears in Addendum A at the end of this chapter, courtesy of A-P-T Research, Inc. That form, and other similar forms, require entry of severity, probability, and risks codes before and after countermeasures are taken. 

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