German risk assessment study on nuclear power plants. Vol. 7

This appendix summarizes the most important results of the plant system investigations, which are presented in the appendices 1 to 6. Of principal interest for the risk, assessment and therefore handled primarily, are the initiating events, which affect the reactor core. For event sequences leading to core melt accidents, different failure modes of the containment have to be analyzed; for controlled accidents, leakage is the only possible failure mode of the containment. These containment failure modes are the basis for the release categories, characterized by their frequency, a certain amount of activities released , as a function of time, etc. The corresponding results as well as the intermediate steps in their evaluation are given. (orig.)