Because of the complexity inherent in a reactor safety analysis, sensitivity tools have been developed to determine the relative influence of the various contributors to plant risk. Three progressively more detailed indicators have been defined and used to reflect plant risks at different levels of the analysis. These techniques have been applied to the risk analysis documented in the Reactor Safety Study (WASH-1400). The general breakdown of risk contributors, evidenced via application of these techniques to the boiling water reactor and pressurized water reactor of that Study, exhibit the generic makeup of reactor risk.