Japan's Nuclear Regulation Authority is expected to indefinitely suspend operations of the Monju fast breeder reactor due to concerns about safety and violations of inspection procedures. The reactor will not be allowed to restart unless its operator, Japan Atomic Energy Agency, conducts a comprehensive review of its safety management system and overhauls the equipment inspection program.

The Monju reactor was most recently shut down after an accident in August 2010. It was expected to begin operations in March 2014, but it will be unable to do so as a result of the NRA actions. Also, Japan was reported considering closing the reactor down entirely.