A model has been made of the primary shutdown system of an Advanced Gas-cooled Reactor nuclear powerudstation. The aim of this paper is to explore the use of sensitivity analysis techniques on this model. The twoudmotivations for performing sensitivity analysis are to quantify how much individual uncertain parametersudare responsible for the model output uncertainty, and to make predictions about what could happen if oneudor several parameters were to change. Global sensitivity analysis techniques were used based on Gaussianudprocess emulation; the software package GEM-SA was used to calculate theudmain effectsud, theudmain effectudindexudand theudtotal sensitivity indexudfor each parameter and these were compared to local sensitivity analysisudresults. The results suggest that the system performance is resistant to adverse changes in several parametersudat once.
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