Niigata Gov. Hirohiko Izumida says he can't allow the restart of three nuclear reactors in his prefecture even if they pass the central government's stress tests to check their survivability in extreme disasters.

Noting that the central government still hasn't gotten to the bottom of the Fukushima nuclear crisis, Izumida said Tuesday in Tokyo that the new safety assessment procedure is almost useless unless the cause of the accident is taken into consideration.

It is "impossible" to restart reactors 2, 3 and 4 at the Kashiwazaki-Kariwa nuclear plant under "fabricated safety," Izumida said.