The Role of Human Reliability in Risk Assessment

THE ROLE OF HUMAN RELIABILITY IN RISK ASSESSMENT 5.2.1. An Illustrative Case Study 

Although the main emphasis of this chapter will be on qualitative human reliability methods in risk assessment, this section will illustrate the importance of both qualitative and quantitative methods in CPQRA. An example of a typical assessment, described by Ozog (1985) will be considered. The stages of the risk assessment are as follows  

A hazard and operability study (HAZOP) was used to identify potential hazards, the most serious of which is aii unrecoverable release from the storage tank. 

FV - Flow Control Valve T - Tank P - Pump PV - Pressure Control Valve RV - Relief Valve V - Valve 1 - 1 inch size P - Pressure T - Temperature L - Level F - Flow I - Indicator C - Controller A - Alarm H - High. L - Low 

FIGURE 5.1 Flammable Liquid Storage Tank P ID (from Ozog, 1985). 

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