Nuclear Nonproliferation Act of 2002

Nuclear Nonproliferation Act of 2002 - Extends through FY 2013 the authority of a program for testing and improving the responses of Federal, State, and local governments to emergencies involving nuclear, radiological, chemical, or biological weapons and related materials.

Directs the Administrator for Nuclear Security to carry out a program on technology for protection from nuclear or radiological terrorism.

Authorizes the Secretary of Energy (Secretary) to: (1) expand the International Materials Protection, Control, and Accounting program of the Department of Energy to include countries outside the Russian Federation and the independent states of the former Soviet Union; and (2) provide technical assistance to the Secretary of State in assisting other nuclear weapons states (countries) to review and improve their nuclear materials safeguards programs. Directs the Secretary to: (1) build on efforts to accelerate the conversion or return to the country of origin of all weapons-usable nuclear materials located in research reactors and other facilities outside the country of origin; and (2) establish a program on the protection, control, and accounting of materials usable in radiological dispersal devices.

Authorizes the Secretary to carry out a program to pursue, with the Russian Federation and any other nation that possesses highly enriched uranium, options for blending such uranium so that the uranium's concentration of U-235 is below 20 percent. Authorizes the Secretary to assist the Russian Federation with its plutonium disposition program.

Authorizes the Secretary to pursue in appropriate international areas options for accelerating programs to improve domestic export control programs for materials, technology, and expertise relating to the construction or use of a nuclear or radiological dispersal device. Requires the Secretary to work cooperatively with the Russian Federation to update and improve the Joint Action Plan for materials protection, control, and accounting programs.

Provides for the utilization of Department of Energy national laboratories and sites in support of Federal, State, or local antiterrorism activities.