Sky sources said it is understood the men being held were British Asians and were taking photographs of the plant.
Four houses were raided today in east London following the arrests at about 4.30pm on Monday.
The men were detained under section 41 of the Terrorism Act after a stop check on a vehicle.
The five, all in their 20s and from London, were held overnight at a police station in Carlisle.
The investigation is being led by counter-terrorism officers in Manchester.
Sky's home affairs correspondent Mark White said: "From what I understand there was nothing found on them that would give immediate cause for concern that there was any potential attack."
A spokesman for Greater Manchester Police (GMP) said the investigation was in its early stages and no further information would be released yet.
The location and timing of the incident, which came hours after news broke that Osama bin Laden had been killed by US special forces, is likely to cause concern.
Police said there was no evidence of a connection to the events in Pakistan, but the Government has urged the public to remain vigilant.
According to reports last year, a counter-terrorism review of Britain's nuclear power plants was carried out after fears arose over safety at Sellafield.
The Sellafield site - responsible for decommissioning and reprocessing nuclear waste, and fuel manufacturing - is heavily protected by private security and officers from the Civil Nuclear Constabulary, some of whom are armed.
Section 41 of the Terrorism Act 2000 allows a police officer to arrest any person who is "reasonably suspected" of being a terrorist.
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