Related Rule
Germany
Practice Relating to Rule 42. Works and Installations Containing Dangerous Forces
Section B. Placement of military objectives near works and installations containing dangerous forces
Germany’s Military Manual (1992) states: “Military objectives shall not be located in the vicinity of works and installations containing dangerous forces unless it is necessary for the defence of these works.” 
Germany, Humanitarian Law in Armed Conflicts – Manual, DSK VV207320067, edited by The Federal Ministry of Defence of the Federal Republic of Germany, VR II 3, August 1992, English translation of ZDv 15/2, Humanitäres Völkerrecht in bewaffneten KonfliktenHandbuch, August 1992, § 468.
In 1983, questions were raised in the German Parliament concerning the planned construction of an ammunition depot 7 kilometres from a nuclear power plant. The government responded that these plants were granted the status of civilian objects under international law and were to be protected as such. The distance between the depot and the plant was construed as being in compliance with international law. 
Germany, Lower House of Parliament, Answer by the government to a written question, BT-Drucksache 10/101, 27 May 1983, p. 14.