Safety Analysis of NPP, the Role of Risk Assessment, and Measuring Risk Importance


In order to be able to “measure” the importance of a particular feature or component which has certain safety function in any technical system (NPP included), an appropriate technical definition needs first to be established for a quantitative measure of the system’s “safety”. One of the, arguably, best ways is to present it through its inversion, the “risk”, which is, in engineer’s terms, quantitatively defined by the famous “risk curve” representing the probability (or frequency) of exceedance as a function of magnitude of consequences, Figure 2-1. This presentation corresponds, for example, to the complementary cumulative distribution function used to depict the risk in NUREG-1150.

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