http://www.nytimes.com/2011/06/21/us/21flood.html
The NYT did a good story on it, with actual journalism.
It is still raining there, but it looks like the NRC had them upgrade their flood defenses last year. And they say that the buildings are waterproof, but I would have asked if the back-up power generators/transmission lines are needed if the reactor is in a cold shutdown mode.