You're correct - I meant to say 5

People don't realize exactly HOW bad things were inside containment at TMI

From circa 1982 to 1992, the company I worked for was a customer of a lab that also tested a LOT of 'stuff' for nuke plants, so I got to see a LOT of what was going on, plus I got to read a LOT of the trade magazines and NRC reports (the testing process often goes 24x7, and you have to be there, with nothing to do for 4-6 hours at a time). The core at TMI was slagged - about 70% of it was 'rubble' down at the bottom. Now here is the fun. The building was hot as heck inside, with radioactive water inside, and now you have to very carefully defuel the reactor, but it's not nice and ordinary, and electronices wouldn't last do to the radiation levels