ABSTRACT
The T-Book is a reliability data handbook for use in Nordic Nuclear PSAs (Probabilistic Safety Assessments). Due to its ambitious scope, high level of detail, and unique approach to analysis of standby components, it has become world-famous, even outside the nuclear field. Since 2005, Scandpower, on behalf of the Nordic PSA Group (NPSAG) and TUD (the editor of the T-Book), has performed a series of projects to enhance and consolidate the process, right from the classification and sampling of data, through parameter assessment, PSA modelling, and up to the final interpretation of results. Two aspects have proven to be of particular interest. Firstly, to provide more homogeneous groups will have positive impact on PSA in terms of less conservative and more precise parameters, as well as increased consistency in the entire modelling process. Secondly, the benefits of homogenization need to be weighed against the use of the multi-parametric model for standby components, because these two aspects are not fully compatible. What is needed is a comprehensive approach, addressing both these aspects, and that makes perfect sense to both analysts and users. This paper addresses what has been concluded up to now, to be introduced in the TUD system during 2013.
