UNITED STATES OF AMERICA NUCLEAR REGULATORY COMMISSION
JAPAN’S FUKUSHIMA DAIICHI ET AUDIO FILE
WEDNESDAY – MARCH 16, 2011
JACK: Yes, Mike, I don’t know that we’ve had anybody say that the fuel is covered with water.
What I can tell you is there’s clear evidence of a very significant hydrogen explosion. The only source of hydrogen that could feed that explosion is the spent fuel pool, so there must have been very, very high temperature zirconium interacting with water.
There is no visible vapors emanating from Unit 4 spent fuel pool area, which would be indicative of no water. It could also be indicative of a fully cooled core. That does not there is no source of cooling water going into the spent fuel pool, so to have a very significant hydrogen explosion, and then to think about the fuel being covered, those are kind of non sequitur concepts.
We do know that there were parts of debris, that the areas of debris around Unit 4 after the explosion which were contributing to very significantly high dose rates, and I understand that bulldozers were used to bulldoze that debris under some soil shielding, and the dose rates went down dramatically. That would be an indication that were
fragments of fuel since there’s no other source of substantial radioactive material which would have been involved in that explosion.
So, there’s indication of a very significant hydrogen explosion. I want to make sure that it’s clear that we don’t know this. We are just interpreting this from the visual evidence that we have, as well as the radiological measurements.
There’s evidence of a very significant hydrogen explosion. There’s evidence of fuel or some very highly radioactive material outside of the building after that explosion. And there’s no evidence of water vapor, which would tell us that the spent fuel pool is dry.