Key parameters in the early stages of a station blackout analysis in a CANDU 6 reactor using RELAP/SCDAPSIM

The present paper describes the behavior of the input key parameters selected in the analysis of the early stages of a Station Blackout scenario simulated in a CANDU 6 reactor. The event timing of an SBO accident progression was described in this paper. However, “time” is merely one of many aspects to be referred for the comparison of the level of safety. An overall comparison of the level of safety needs more carefully constructed overall risk profiles, i.e. both the probabilities and consequences for an adequate spectrum of scenarios. The limitations of the analyses also result from the uncertain severe accident phenomena. Uncertainties are inherently very large for an analysis of severe accident phenomena. The objective of this analysis is to identify and classify the important key parameters to quantify the response of the reactor systems in predicted safety analysis under best estimate conditions. The uncertainty analysis using RELAP/SCDAPSIM/MOD4.0 follows the input-propagation approach using probability distribution functions to define the uncertainty of the input parameters.