In article , pyotr filipivich
says...

Didn't work at Three Mile Island....

:^)

Yeah, but the containment wall held.

No, the *secondary* containment held. The
fuel cladding melted and failed, the core slumped
to the bottom of the pressure vessel.

And during the event, the pressurizer relief valve
was dumping primary loop coolant into the reactor
building sump, which overflowed, which then was
then automatically pumped into another building,
where *that* tank overflowed.

In that sense the primary containment of the
reactor was breeched badly.

Jim


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