UCS staff monitor and work to improve the safety and security provisions at existing nuclear power plants and the performance of the industry's oversight body--the Nuclear Regulatory Commission; assess the safety, security and nuclear weapons proliferation risks of new reactors; and analyze the pros and cons of increasing nuclear power as a means of reducing global warming. We write reports, file formal petitions to the NRC, testify before Congress, and provide technical assistance to groups of citizens living near nuclear plants.