It looks like Tepco doesn't like the $110/lb they contracted for. Increased regulatory issues isn't a force majeure in a lot of books. The tsunami was but restarts have happened.  I think they'll look to settle this at lower rates- we'll see if Cameco will play ball. "In practice, most force majeure clauses do not excuse a party's non-performance entirely, but only suspend it for the duration of the force majeure" - Wikipedia.