Of everything I’ve read in the last week, this may be the most horrifying. Gregory Jaczko, chairman of the Nuclear Regulatory Commission, told the House Energy and Commerce Committee yesterday what he thought has happened to the spent fuel pool for Fukushima Daiichi Unit 4:
“What we believe at this time is there has been a hydrogen explosion in this unit due to an uncovering of the fuel in the spent fuel pool,” he said, noting the explosion happened several days ago but its effects were cause for concern.
“We believe that secondary containment has been destroyed and there is no water in the spent fuel pool and we believe that radiation levels are extremely high which could possibly impact the ability to take corrective measures.”
(This is another re-post of an item that disappeared in the trash earlier today.)