Title: Understanding the accident of Fukushima Daiichi NPS
Source: IRSN (France’s Radioprotection and Nuclear Safety Institute)
Uploaded by: fukushimafuture
Date Uploaded: February 2, 2013
Film made in February 2012
At 5:30 in
The meltdown scenario is almost the same in all three reactors, only the dates changed.
The water in the reactor vessel evaporated. The fuel became uncovered, heated up to a temperature of 2,300 degrees Celsius.
The fuel melted and mixed with the materials from the structure to form a magma called corium.
The corium flowed down to the bottom of the reactor vessel.
According to Japanese officials it pierced the reactor vessel before falling on the concrete base mat inside the containment.
What quantity of corium fell?
How deep did it erode the concrete?
Did it pierce the steel liner?
Even today it is not possible to learn more about the state of the corium in the three reactors.
Published: February 3rd, 2013 at 3:14 pm ET
- Wired: ‘Healthy debate’ about location of Fukushima corium — Lava can melt a foot of concrete per hour — Cooling with water may not stop corium flow April 18, 2013
- Yamada: Fuel could be outside containment — Concrete does not erode uniformly — No one knows shape of corium — Big problems with Tepco estimation (VIDEO) September 3, 2012
- French nuclear specialists agree Fukushima “could still explode”, corium a threat — Reactors remain in meltdown says expert, molten lava could break through at any point March 11, 2012
- IAEA Paper: Corium was not cooled in majority of tests using water injected from above, as done at Fukushima — Were studying how to stop molten core from melting through concrete December 26, 2013
- 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