Police in Essex are currently at Bradwell Power Station after a "suspicious package" was found nearby.
They have placed a 200m cordon around the dilapidated plant after they were called just before 9am.
The approach road has also been closed while officers investigate.
The power station was decommissioned in 2002 and there is no nuclear energy left on the site.
The incident has now been stood down and police say that the package didn't contain anything malicious.
A leading union has raised safety and job fears over the technology to be used in a possible new nuclear power station.
The GMB has written to the Government and safety bodies saying it feared the Bradwell nuclear site in Essex could be handed over "lock, stock and barrel" to China's national nuclear corporation.
The Chinese could then use their own technology, and possibly bring thousands of workers to the UK, dealing a blow to this country's own nuclear industry, the union claimed.
National officer Gary Smith said in a letter to Energy Secretary Amber Rudd:
"The idea that a Chinese state company will be given a site in the UK, not far from London, where they can use Chinese labour to construct a reactor to be made in China and using Chinese components would in our view constitute economic madness and raises serious safety issues."
The Magnox power station at Bradwell is currently being decommissioned.
A mother from Bradwell in Essex says she's been left heartbroken after a puppy her son was given to help with his autism has gone missing.
Rex, a six-month-old American bulldog, hasn't been seen since last Wednesday.
Rex is a registered autism support dog for Mari's five-year-old son Tim.
"From the minute that he saw him his eyes just welled with tears and he was smiling and he said "Mummy, look this is Rex." He named him within two minutes," Mum Mari Wood told ITV News Anglia.
"That's the hardest bit, knowing that I don't know where he is and I don't know when he is going to come back."
A mother from Bradwell in Essex says she has been left heartbroken after a puppy her son was given to help with his autism has gone missing.
Rex, a six-month-old American bulldog, has not been seen since last Wednesday.
Mari Wood has been handing out posters to help find him. Rex is a registered autism support dog for Mari's five-year-old son Tim. He has not been told that the puppy is missing.
A143 Beccles Road is blocked in both directions due to accident involving a car and a motorcycle between Beccles Road and Lynn Grove.