Korea's oldest nuclear reactor, the Kori No. 1, resumed operation this Sunday morning following an extensive safety check up and approval to restart.
The Kori reactor is located in the country's southeastern coastal town of Gori in Busan.
It was down last month due to malfunction of electric circuits.
Then, it underwent an inspection especially with rising safety concerns regarding nuclear power plants following Japan's latest nuclear crisis.
The government plans to continue running the 33-year-old reactor through 2017 which is long past its original 30-year lifespan despite opposition from local civic groups.
Meanwhile, the government plans to spend one trillion won or about 920 million US dollars for the next five years on improving safety of all atomic power reactors in the country.