Occurrence rates of fires in nuclear power plants

The time histories of fires in nuclear power plants are examined. Occurrence rates and expected number of fires vs. time are obtained. The time dependence analysis is modelled as a non-homogeneous Poisson process with Weibull occurrence rate. Confidence bounds on the model parameters are determined and the appropriateness of the model is evaluated using various statistics. The results are expected to be useful for application to risk studies.