I heard that they did, but the connector plugs from the units didn't fit the old-style connectors from when the plants were built. They needed to 'hot-wire' the leads in place, and that takes time they had not enough of.
What most people don’t realize is that the worlds powers systems are not all alike. I’m not sure what Japans current is but in the UK its 50hz 220v, and the 3 phase is even different. I actually have a 25kw military powerplant that was made for either European 50 cycle or US 60hz cycle.
The irony is that the plant that was hit hardest was on schedule to be decommissioned at the end of the month. Now instead of being shut down, it’s BREAKING down.