The aim of this research is to explore what kind of safety and security arguments are used in German parliamentary debates regarding the use of nuclear energy from March 2011 till June 2011 when the discussions were most pressing. The time span begins with the nuclear disaster of Fukushima and ends with the German parliament, Bundestag, passing new bills which constrict the use of nuclear energy. The reduction and ending the use of nuclear energy is referred to by the term Atomausstieg. In the theoretical framework, I discuss parliamentary debates, securitization and energy safety and security - this section functions also as my research method. In light of the data, references to the nuclear disaster are common, but the debates also entail several other threats. Pivotal phenomena in this research, therefore, are the various energy safety and security threats posed by nuclear energy. The results show that energy safety and security issues regarding nuclear power are numerous and varied starting from a secured energy production, followed by threats of terrorism and environmental catastrophes, and continuing with concerns over foreign relations. Also, the results show that these debates comprise a particular time span among the decades when Atomausstieg has been deliberated upon.