The Nordic R&D project MODIG (MODelling of DIGital I&C) aims to get a consensus approach for a reliability analysis of a plant design with digital I&C. The relevant part of the project for this paper is software failure probability quantification. To be able to define relevant software failure modes the I&C system needs to be split into a number of entities. The software entities are basically system software and application software. The system software can be further split into the run time environment and communication software. The failure modes applicable for each type of software differ. The approach to estimate the probability for various software failure modes is also discussed. System software failure probability estimate should be based on operational experience. Also the probability that an application software causes a fatal failure of the processor (crash) could be estimated based on operational experience. Non-fatal failures (functional failure without processor crash) for application software has to be treated differently, as sufficient operational data is not available. The non-fatal failure probability is suggested to be estimated based on an analytical approach using metrics of complexity and verification and validation.
|Title of host publication||PSAM 13, 13th International Conference on Probabilistic Safety Assessment and Management|
|Publisher||International Association of Probabilistic Safety Assessment and Management IAPSAM|
|Publication status||Published - 2016|
|MoE publication type||A4 Article in a conference publication|
|Event||13th International Conference on Probabilistic Safety Assessment and Management - Sheraton Grande Walkerhill, Seoul, Korea, Republic of|
Duration: 2 Oct 2016 → 7 Oct 2016
Conference number: 13
|Conference||13th International Conference on Probabilistic Safety Assessment and Management|
|Abbreviated title||PSAM 13|
|Country||Korea, Republic of|
|Period||2/10/16 → 7/10/16|
- digital I&C
- probabilistic risk assessment
Bäckström, O., Holmberg, J-E., Porthin, M., & Tyrväinen, T. (2016). MODIG - Modelling the reliability of digital I&C in modern nuclear power plants. In PSAM 13, 13th International Conference on Probabilistic Safety Assessment and Management International Association of Probabilistic Safety Assessment and Management IAPSAM.