Safety matters play the most important role in the peaceful utilizatio
n of nuclear power. Measures and installations preventing accidents fr
om occurring and potential consequences from propagating are incorpora
ted already in the design phase of a nuclear plant. The defense-in-dep
th principle ranks importantly in this phase. Plant licensing is influ
enced in particular by siting criteria. Protection against seismic eff
ects, airplane crash and influences of war and sabotage must be ensure
d.