DEALING WITH UNCERTAINTIES IN NUCLEAR SAFETY ANALYSES - PART II (DETERMINISTIC APPROACH)

The paper is structured in two parts: (I) uncertainties treatment for probabilistic approach; (II) uncertainties treatment for deterministic approach. Part I presented the contribution of the authors to the development of the methodology for uncertainty analysis in probabilistic safety assessments calculations. Part II presents some original contributions for the uncertainties estimations and their influences in final results for a deterministic approach. A very complex situation is chosen: fission products transport in CANDU primary circuit during a severe accident. For the most sensitive parameters, credible domains of variations were selected and values of the parameters respecting postulated distributions. An analysis of the influences of these parameters in the most important output results is performed.