FACTBOX - Iran's nuclear activities

(Reuters) - Iranian officials met envoys from world powers, including the United States, on Saturday in Geneva to discuss the dispute over its nuclear program.

Here are some details about the program:

* BACKGROUND

-- Iran says it wants to build nuclear power plants so it can maximise exports from oil and gas reserves, the world's second largest. The West suspects Tehran is seeking the capacity to make nuclear bombs since it is enriching uranium but without power plants to use such fuel.

-- Russia is working to complete Iran's first, and so far only, nuclear power plant, begun before the 1979 Islamic revolution, at Bushehr on its southwestern Gulf coast. It is designed to run only on Russian-produced fuel, according to a senior Western official in the Middle East.

-- In 2002, an exiled Iranian opposition group revealed the existence of the underground Natanz facility in central Iran to enrich uranium, a process that can yield fuel for power stations or, if highly refined, material for nuclear warheads.

* BUSHEHR:

-- Construction of two pressurised water nuclear reactors began in 1974 with German and French help. The two complexes were partially built before the 1979 revolution, when Western partners withdrew and the project was frozen.

-- A Russian contract to resume construction was signed in 1995. Iran says Bushehr will be part of a power plant network planned to produce 20,000 megawatts by 2020. It says it intends to launch test runs at Bushehr this year.