From the Mainichi:
Nuclear watchdog finds 3 nuclear plants guilty of 'malicious' safety violations. The Mainichi, June 30, 2016 (Mainichi Japan) http://mainichi.jp/english/articles/20160630/p2a/00m/0na/010000c
The Nuclear Regulation Authority (NRA) concluded on June 29 that three nuclear power plants were guilty of "level 2" safety violations by breaching standards on placement of power cables
A "level 2" violation is the second heaviest violation in the NRA's four-tier list.