In case you were wondering, the plant operator says the plant's fine. From FB,
STP Nuclear Operating Company
6 hrs [around 7PM ET]
The plant is doing well, high and dry. The sun is out today. Congratulations to our fabulous storm crew for keeping the plant safely operating.
http://www.facebook.com/pg/stpnoc/posts/?ref=page_internal
From their website,
"The facility is designed with watertight buildings and doors such that emergency electric power and cooling systems remain fully functional. All buildings housing safety equipment are flood-proof to an elevation of at least 41 feet above MSL."
http://www.stpegs.com/#/storm-information