Washington Examiner looks like the landing spot for an ad you would get on Facebook. I strongly doubt 90% of the world would die from that. It would be bad sure, but humans are resourceful.
“ In seven days, the over 100 nuclear power reactors run out of emergency power and go Fukushima, spreading radioactive plumes over the most populous half of the United States. ”
I didn’t see in the article, but why can’t the nuclear power plants shut down well before they ‘go Fukushima’?
https://www.washingtonexaminer.com/washington-secrets/new-em...
Nature is periodic, take it seriously: https://en.m.wikipedia.org/wiki/Carrington_Event