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Meltdown (my emphasis):

Radioactive water at No. 2 reactor due to partial meltdown: Edano | Kyodo News

He said the government has been informed by the Nuclear Safety Commission of Japan that ''water in a containment vessel that came into contact with fuel rods that partially melted at one point is believed to have been leaked,'' referring to the high levels of radioactive water found at the basement of the reactor's turbine building.

Edano told a news conference that the government believes the meltdown is not continuing.



*Lunatic*, n.
One whose delusions are out of fashion.
by DoDo on Tue Mar 29th, 2011 at 11:49:11 AM EST
[ Parent ]
But the meltdown could easily resume if they cannot continue present emergency measures. How do we calculate the time to cold shutdown in a reactor where there has been a partial meltdown. Seems we need better definitions of "partial". It matters whether the rods have cracked and the pellets have been exposed to sea water or whether the pellets have fallen out and collected on the bottom where recriticality is conceivable, especially in #3, with MOX fuel.

"It is not necessary to have hope in order to persevere."
by ARGeezer (ARGeezer a in a circle eurotrib daught com) on Tue Mar 29th, 2011 at 03:00:29 PM EST
[ Parent ]
well we'd need to draw a graph of the temperature results, Im sure I saw in an Oildrum thread that  its cooling approximately 20% slower than the reference cooling curve.

Any idiot can face a crisis - it's day to day living that wears you out.
by ceebs (ceebs (at) eurotrib (dot) com) on Tue Mar 29th, 2011 at 03:22:15 PM EST
[ Parent ]
Certainly. Active cooling will be needed for years.

*Lunatic*, n.
One whose delusions are out of fashion.
by DoDo on Tue Mar 29th, 2011 at 05:10:20 PM EST
[ Parent ]

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