Nuclear Cores and Spent Fuel Pools Have Both Lost Containment
Steven Starr – Director of the Clinical Laboratory Science Program at the notes that the location of Fukushima melted fuel is unknown. It could be ‘scattered’ in piping, vessels … “we’ve yet to identify all hotspots” around plant.
While the Japanese government tried to cover up the lack of containment with “mission accomplished” type announcements of “cold shutdown“, the loss of containment has been known for years.
For example, AP wrote in December 2011:
The nuclear fuel moved as it melted, so its condition and noted a couple of days later:
The complex still faces numerous concerns, triggering criticism that the announcement of “cold shutdown conditions” is based on a political decision rather than science. Nobody knows exactly where and how the melted fuel ended up in each reactor ….
We noted last year:
If the reactors are “cold”, it may be because most of the hot radioactive fuel has leaked out.
The New York Times pointed out last month:
A former nuclear engineer with three decades of experience at a major engineering firm … who has worked at all three nuclear power complexes operated by Tokyo Electric [said] “If the fuel is still inside the reactor core, that’s one thing” …. But if the fuel has been dispersed more widely, then we are far from any stable shutdown.”
Indeed, if the center of the reactors are in fact relatively “cold”, it may be because most of the hot radioactive fuel has leaked out of the containment vessels and escaped into areas where it can do damage to the environment.
After drilling a hole in the containment vessel of Fukushima reactor 2, Tepco cannot find the fuel. As AP notes:
As nuclear expert Arnie Gundersen pointed out last year:
Tokyo Electric ran a probe into the basement of Unit 1. This is not inside the containment, this is outside the containment. On the top of the water surface they found lethal radiation, 1000 rem an hour.
But then they put the probe down into the water and what’s even worse is the bottom,the sediment on the bottom, was thousand of times hotter than that. And what that indicates is that fuel, nuclear fuel, has left the containment, as particles, and settled out on the bottom outside the containment. So, I think that’s a pretty clear indication that the containment was breached. It just makes decommissioning these plants… it was going too be hard already, but this information makes it worse.
Loss of containment of nuclear fuel also exists within the spent fuel pools at Fukushima.
For example, Chris Harris, former licensed Senior Reactor Operator and engineer says of new video released by Tepco showing extensive damage and debris in Fukushima spent fuel pool 3:
Plenty of heavy steel beams and refueling equipment that must be cleared out of the way in order to see how badly damaged each fuel assembly is.
There is little doubt that failed fuel exists, which is highly radioactive.
Asahi Shimbum notes:
The water [inside Fuel Pool 4] was muddy and brown.