Bad weather conditions (n=165, 67%) were the most frequent primary causal factor contributing to hurricane-related events. Other primary causal factors were human error (n=61, 25%), equipment failure (n=11, 4%), and intentional release (n=8, 3%). Of the 225 (92%) events where a secondary causal factor was also reported, the most frequently reported were system start-up or shut down (n=120, 53%) and power failure (n=70, 31%). Other secondary causal factors included equipment failure (n=19, 8%), system/process upset (n=7, 3%), and fire (n=4, 2%). Of the 120 events where system start-up or shut down was a contributing causal factor, 6 (5%) were shutdowns in preparation for Hurricane Katrina, 59 (49%) were shutdowns in preparation for Hurricane Rita, and 55 (46%) were start-ups after Hurricane Rita.
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