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Application of the VTT/STUK expert judgement methodology to a hydrogen issue in a generic evolutionary PWR

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Abstract

This paper summarises the application of STUK/VTT methodology for using expert judgements in the Phase 2 of the Benchmark Exercise on Expert Judgement Techniques in Level 2 PSA, as a concerted action of European Commission Fourth Framework Programme on Nuclear Fission Safety. In this phase, the expert judgement methodology was applied to the assessment of probabilities of hydrogen combustion and detonation in an accident scenario. The expert's had very diverging opinions, which is reflected to the final results as large uncertainty. This uncertainty could possibly be narrowed by improving the background information and increasing the work efforts for analyses.

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