"Influx of jellyfish" shut down St. Lucie

This just in:

A daily event report filed by St. Lucie nuclear power plant in Florida to the U.S. Nuclear Regulatory Commission reveals:

"MANUAL REACTOR TRIP DUE TO RISING CONDENSER BACKPRESSURE"

"On August 22, 2011 at 1513 [hrs. EDT], Unit 1 was manually tripped due to rising condenser backpressure. All CEAs fully inserted into the core. Decay heat removal was initially from main feedwater and steam bypass to the main condenser. The cause of the rising back pressure was an influx of jellyfish into the intake structure, degrading the circulating water system performance...

Unit 2 is in Mode 1, currently at 70 % power. Unit 2 power is being reduced from 100% in response to the influx of jellyfish."