The science and technology ministry overseeing the trouble-prone Monju fast-breeder reactor is considering starting decommissioning of the facility in 2020, ministry sources said Tuesday.

It is the first time a specific time frame for decommissioning work for the Monju reactor in Fukui Prefecture on the Sea of Japan coast has been revealed in a proposed plan by the Ministry of Education, Culture, Sports, Science and Technology.

The move comes as the government is fundamentally reviewing the Monju project, including the decommissioning of the reactor, which has been plagued with a series of safety problems and has come under fire for being costly.