ABSTRACT
To perform a Human Reliability Assessment, different methods were developed, referred to as HRA methods. Key issue of HRA methods in a safety case for complex systems is the correct modeling of the situation (respectively scenario) to assess and the correct calculation of human reliability. These in turn are determined by the correct scope of an assessment, the capabilities of the selected HRA method to represent the issues within the scope completely (the better the representation the higher the qualitative ranking) and the suitability of the data for the human reliability assessment (Straeter 2008; ISO/IEC 31 010). Only when these conditions are met successfully, a risk management can be valid and effective. Three elements are important to for this validity (1) Importance of Scope of Reliability Assessments; (2) Assessment of Human Reliability; (3) Risk Management. The preconditions to fulfill these three elements will be discussed in this paper as part on the HRA panel.
