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if some of the corium flowed down the drywell sumps and out into the downcomers

The point of the blog post provided for your reading pleasure and education was the consequence of corium outside the BWR reactor vessel. Look closely at how the reactor building is configured for a Mark I Containment. Do you see what they label "downcomer"? There is a second downcomer inside the reactor vessel between the core barrel and the reactor wall (where the jet pumps are). The drywell is immediately outside the reactor vessel (do you see that in the illustration provided?) -- the drywell sump is directly below the lower head of the reactor vessel. The bottom of the upside-down-light-bulb shaped drywell is filled with concrete. Then you reach the steel liner that is the upside-down-light-bulb itself. Then you start into the foundation of the reactor building supporting the 700 ton reactor vessel and all of the other equipment in the reactor building. The foundation is over twelve feet thick by itself. Now read the comment you posted. Does it make any sense??? I have to say that I have rarely read anything on FR as ignorant as the comment you wrote above. If you do work at an n-plant, then you need to think about a new line of work.

The data I posted was extracted from the Reactor Safety Training Course (R-800) manual from the NRC. Perhaps you would like to complain to them ? And since you apparently work in the industry, perhaps you might want to read the manual. Sure could have helped those nuclear workers at TEPCO who apparently had trouble finding their own safety manuals the night the Tsunami hit.

The link below contains the following sections and chapters from the actual course manual, not pages on a blog

Special Considerations for BWR Facilities section 3.7
Accident Progression in the Containment chapter 4.0
Offsite Accident Impacts chapter 5.0

Reactor Safety Training Course (R-800) manual sections and chapters related to Fukushima accident

Give me a page number and show where I was wrong. Will be more then happy to correct myself with a cogent response.

you need to think about a new line of work

Everyone in the nuclear power industry needs to start thinking about that. Japan meltdowns + American public school system + Muslim immigrants + EEO laws = end of new nuclear power in America. Using Japanese workers is as good as it gets and even they couldn't do nuclear safely.