It's argument for the safety of nuclear power, because 2011 Tōhoku earthquake and tsunami (Earthquake was the most powerful ever recorded in Japan, and the fourth most powerful recorded in the world since modern seismography began in 1900) caused over 15,000 deaths. In contrast the meltdown of Fukushima Daiichi Nuclear Power Plant started by the tsunami caused much less deaths.

https://en.wikipedia.org/wiki/2011_T%C5%8Dhoku_earthquake_an...

Would a similar earthquake and tsunami cause 150 000 deaths, if it happen near Tōkai?

Nuclear operators studied the reasons for meltdown of Fukushima Daiichi NPP (failure to restore cooling after wide spread destruction of infrastructure around nuclear power plant and flooding of backup diesel generators underground) and have prepared steps to prevent it in other power plants (aditional backup diesel generators mounted in higher places, helicopter transport of spare cooling equipment when roads are destroyed).

"As an example, the French Nuclear Safety Authority (ASN) initiated an assessment of the country’s 56 nuclear power reactors as well as the 2 EPR reactors under construction. The ASN then prescribed the implementation of both fixed and mobile equipment that could potentially prevent a large release, including high-resistance diesel generators and pumps able to function in extreme scenarios such as major earthquakes or flooding. The availability of alternative sources of water for cooling was also prescribed under the same conditions. In addition, the ASN required a back-up plan including rapid action force groups that can be on site within 24 hours with light equipment and within three days with heavy equipment, using transportation means such as helicopters, and that can operate in a severely disrupted environment."

https://www.iaea.org/bulletin/ensuring-the-safety-of-nuclear...