Title: Yastel Yamada’s presentation on behalf of Skilled Veterans Corps for Fukushima
Source: Women’s International League of Peace and Freedom and the Social Uplift Foundation in Los Angeles
Date Recorded: Aug 20, 2012
Date Aired: Aug 23, 2012
Published by: KPFT Progressive Forum
Yamada: In the case of Fukushima, the molten fuel breaks the RPV [Reactor Pressure Vessel] and fell down to the PCV [Primary Containment Vessel] and eroded the cement concrete at the bottom.
Tepco has estimated the depth of the erosion, say 25 inches. But some concrete still remains until the bottom shell.
But there are so big errors contained in the base of the calculation, estimation.
The temperature measured in the vessel which has certain errors because of the accident, or explosion.
And also no one knows the shape of the debris, so called fuel debris.
And therefore there are so many estimation.
In addition to that the material of the concrete is not uniform, you have to have the mixture of sand stone, sand and concrete.
Therefore uniform erosion cannot be expected.
Therefore the bottom of shell, the PCV, could be damaged.
That cannot be detected or checked because this steel is covered by cement concrete and supported by cement concrete. No one can enter in that. This is very important.
Listen to the report here
Published: September 3rd, 2012 at 3:13 pm ET
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- Japan Nuclear Expert: Simply impossible to remove melted fuel from Fukushima — Corium “has spread all over… could actually have gone through floor of containment vessel” — Only way to deal with these reactors releasing dangerous radiation is to cover in concrete — Will take centuries of work (VIDEO) April 27, 2015
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