From the MIAMI HERALD/Tom Dubouq, September 5, 1992:
"Demolition crews toppled a 400 foot smokestack at Turkey Point [nuclear] power plant [owned by Florida Power and Light Company] Friday, September 4, 1992. The stack, which had a 200 foot gaping crack, was dropped without a hitch, a Florida Power and Light spokesperson said. The other smokestack at the plant will be salvaged. Turkey Point will be shut down for several months while repairs are made. The cost will exceed 90 million [dollars] according to an initial damage report… When Turkey Point was built in the 1960's, its main structures were designed to withstand 235 mph winds. Hurricane Andrew was clocked at 164 mph at the plant. Florida Power and Light officials don't know why the smokestack didn't hold up."
The smokestack did not hold up because Hurricane Andrew had much stronger winds that originally estimated.
Hurricane Andrew was reassessed and upgraded to a CAT 5 years later.
This is the info on the upgrade of Hurricane Andrew.