NPSAG/SAFIR/NKS project DIGREL : Digital I&C reliability

S. Authén, Jan-Erik Holmberg

Research output: Contribution to conferenceConference articleProfessional


The OECD/NEA CSNI Working Group on Risk Assessment (WGRisk) has set up a task group called DIGREL to develop a taxonomy of failure modes of digital components for the purposes of probabilistic safety assessment (PSA). The taxonomy is aimed to be the basis of future modelling and quantification efforts. It will also help define a structure for data collection and to review of PRA studies. A parallel Nordic activity carried out a pre-study where a comparison of Nordic experiences and a literature review were performed. The study showed a wide range of approaches and solutions to the challenges given by digital I&C. In order to study the effect of I&C design features and modelling approaches, an existing simplified PSA model has been complemented with fault tree models for a distributed reactor protection system. The paper summarises the failure modes taxonomy work.
Original languageEnglish
PagesPaper S5-1
Publication statusPublished - 2013
MoE publication typeNot Eligible
EventNordic PSA Conference - Castle Meeting 2013 - Stockholm, Sweden
Duration: 10 Apr 201312 Apr 2013


ConferenceNordic PSA Conference - Castle Meeting 2013


  • probabilistic safety assessment
  • digital I&C
  • reliability analysis
  • failure mode
  • taxonomy


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