The present work engaged the potential liability claims after a nuclear disaster. The accident at the nuclear power plant of Daiichi, Fukushima serves as a role model. In this work, this case is however hypothetically moved to determine the respective rights under German law to Germany and finally made a cross-border related to the Austrian legal situation. A fictional facts, the individual personal property damage and environmental damage of a closer examination undergo now. It first examines the German Atomic Energy Act with international conventions (Paris Convention of 1982, as well as Brussels Protocol of 1982). Follows is a subsumption within the scope of the respective legal bases. Connection explores the individual claims according the German AtG. Finally, the liability, financial security, the indemnification obligation of the Federal Government and the limitation period can be checked. In the latter of work, a cross-border related to the Austrian legal situation is made. The individual claims of the Austrian victims be tested on the basis of the nuclear liability Act applicable in Austria. There is also here a subsumption under the scope, as well as assessing the liability and financial security. The issue of the enforceability of the judgments issued in Austria is addressed finally.