I don't know about individuals in the government, but the government was held liable for some amount (seemingly <$10MM)[0][1] and top company executives were fined tens of billions[2].

[0] https://www.theguardian.com/world/2017/mar/17/japanese-gover...

[1] https://archive.vn/UnavD

[2] https://www.hazardexonthenet.net/article/191735/Former-Fukus...