Nuclear energy has only contributed to 10% of electricity generation in Germany - not to the total energy supply. Furthermore, nuclear energy is far from being self-sufficient. Germany and France import (or imported) uranium from Russia. In quantities that Russia could not provide if it did not itself source uranium from other countries (which Germany, at least, decided not to import uranium from due to a self-imposed commitment). This adds to the dependency on Russia and other countries regarding the remainder of the nuclear fuel cycle.

Then there's coal, oil, and gas. Reducing these is the mammoth task in terms of energy self-sufficiency and independency. Nuclear was marginal at best. France will be a different (very problematic) story…