Nuclear Regulatory Commission Chairman Gregory Jaczko said June 8 that there is a need for better international cooperation on safety standards and monitoring in order to prevent nuclear disasters like the one Japan has battled since March, but that ultimate authority over plan operations should remain with national authorities. His comments were made during a conference of nuclear reactors from 37 countries held by the French presidency of the Group of Eight countries and the Nuclear Energy Agency of the Organization for Economic Cooperation and Development.