Human reliability is an important part of PSA of a nuclear power plant (NPP). Empirical human reliability data is a constantly sparse. Thus, HRA can be seen as a suitable application area of expert judgement. The case described in the paper is the HRA study for a shutdown LOCA case of a NOrdic BWR NPP. Applying expert judgement to HRA includes training of experts, individual expert work, expert reporting, joint disucssions, intervies (judgement elicitiation), feedback and anlaysis of the expert judgements by normative experts. In our case, the emphasis was put on experts' reasoning to aviod biases and too simplified use of heuristics. The combination of expert judgements took place by using a Bayesian model. In the paper, we describe the methodology and discuss both the qualitative and the quantitiative results. Insights about the work will be presented. We will also disucss the applicability of the methodology and make some recommendations.
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