Iran's explanation is that the nuclear smuggling network run by Pakistan's Abdul Qadeer Khan had sent it this document in 1987, along with other documentation on centrifuges Iran had received, but that Iran had not asked for it.
The six countries will meet Wednesday in Frankfurt, Germany to discuss Iran's nuclear program, the network said.
CNN: Report: Iran has 'updated nuclear package'; ready to hold talks
The exposure of Mr Khan, a metallurgist, as the hub of a network of nuclear-technology proliferation has left many seeing him as a fall-guy for crimes that could not have been committed without the knowledge of the army top brass.
Industrial partners on the project include Sellafield, the National Nuclear Laboratory, BAE Systems and Network Rail.
The new power lines would be needed to carry electricity from the proposed new nuclear power station to connect to the network in Avonmouth.
BBC: National Grid urged to use underground cables in Somerset
In January 2003 the Microsoft SQL Server worm, known as Slammer, infected a private computer network at David-Besse nuclear power plant in Oak Harbor, Ohio, disabling a safety monitoring system for nearly five hours, says the Nuclear Regulatory Commission.
Personal computing emerged in the 1980s as something Hollywood couldn't ignore, with films like "Tron, " about a hacker who gets trapped in a computer game, and 1983's "WarGames, " about a nerdy high school student who nearly causes a nuclear apocalypse after breaking into a military-operated computer network.
National Grid is currently consulting on plans to develop its network to carry electricity from the proposed wind farm and the planned new nuclear power station at Wylfa on Anglesey.
The existing traditional network will also need to be upgraded to accommodate electricity from new power stations, including nuclear, the report by the Electricity Networks Strategy Group for the government said.
It was revelations about Iran's hidden nuclear programme, and the interception of a shipment of nuclear parts bound for Libya (which hastened Libya's decision to tell all about its dealings with the Khan network), that brought Mr Khan down with a thud.
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