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Core Damage Frequency (CDF) is a risk metric often employed by nuclearregulatory bodies worldwide. Numerical values for this metric are required byU.S. regulators, prior to reactor licensing, and reported values can triggerregulatory inspections. CDF is reported as a constant, sometimes accompanied bya confidence interval. It is well understood that CDF characterizes the arrivalrate of a stochastic point process modeling core damage events. However,consequences of the assumptions imposed on this stochastic process as acomputational necessity are often overlooked. Herein, we revisit CDF in thecontext of modern point process theory. We argue that the assumptions requiredto yield a constant CDF are typically unrealistic. We further argue thattreating CDF as an informative approximation is suspect, because of theinherent difficulties in quantifying its quality as an approximation.

Is Core Damage Frequency an Informative Risk Metric?