Some people are worried that the expansion of nuclear power will cause the proliferation of nuclear weapons. This concern is difficult to dispel although there is historically no evidence for it. In particular, the recent acquisition of nuclear weapons by North Korea is completely unrelated to civil nuclear power.
Most countries participate in international initiatives designed to limit the proliferation of nuclear weapons.The international safeguards system, in place since, has successfully prevented the diversion of fissile materials into weapons. Its scope has been widened to address undeclared nuclear activities.The IAEA undertakes regular inspections of civil nuclear facilities and audits the movement of nuclear materials through them. Safeguards are backed by diplomatic and economic measures.