When the 2011 Tohoku Earthquake hit Japan, an oil tank ruptured and caught fire in the city of Kesennuma. The whole city burned down. As per Wikipedia: "As of 22 April 2011, the city had confirmed 837 deaths with 1,196 missing."

Which is lower than most death estimates for Fukushima.

In other words, the world's second worst nuclear disaster killed fewer people than another fossil fuel disaster that happened on the same day, due to the same external reason, which was so minor (for a fossil fuel disaster) that most people outside Japan haven't even heard about it.