South Korea says US troops have begun to build plants modern block missiles in the same area south of the country.
Pictures of the plant's how it works to prevent missiles
The plant to defend itself against the rockets, who is known professionally as THAAD, in English, 'Terminal High Altitude Area Defense', due to concerns about the threat from North Korea which has continued to experiment with rockets.
Ministry of Defense of South Korea said the reactor will be completed and will be ready to serve in just one year.
There have been reports of the appearance of confrontations between natives and police area panapojengwa reactor, previously a domain of the game of golf.
The plant is built on the territory of Seongju.
China has been opposed to placed in the reactor.
US President Donald Trump has indicated that the US is ready to take action on its own without involving China deal with nuclear threats from North Korea.