ABSTRACT
The reliability and availability of the Dutch storm surge barriers are calculated by probabilistic risk assessment and various underlying risk analysis methods. These calculations, however, focus on the numerical probability of the storm surge barrier functioning adequately, and the implementation of the many constraints from the risk analysis is merely an implicit factor. However, the conformability of the organization should be verified during the performance assessment, in order to validate the calculated performance. Within Rijkswaterstaat, and for specific use at the storm surge barriers, a tool has been developed for an internal audit. This paper focusses on the approach Rijkswaterstaat has chosen for the review of the validity of a risk analysis, including the adaptation of ISO and auditing standards, specific check points on risk analysis matters and the self-auditing regime that Rijkswaterstaat proposes for the storm surge barriers and their performance analysis.
