Fukushima Unit 3 Concrete Reactor Cover Damaged
TEPCO has admitted that the concrete reactor well cover on unit 3 has been damaged. They floated two possible causes. One being the explosion itself, the other being the overhead crane falling on the covers as part of the blast. The crane portion that holds the hook is what is assumed to have done the damage.
The center panel of the concrete cover is broken and sunken. TEPCO’s report guesses that the lower cover layers are partially intact due to the rebar within the concrete. They do not think the cover has impacted the steel containment cap beneath. TEPCO has not done any actual inspections below the concrete covers so these determinations are mostly guesses based on what can be seen above.
TEPCO cited relatively low radiation levels on dust sampling but the area around the reactor well has remained incredibly high. There is a plan in the works cited in recent roadmap reports that they will put some sort of steel or similar shielding around the reactor well to protect workers.
The full handout in Japanese can be found here:
http://www.tepco.co.jp/nu/fukushima-np/handouts/2014/images/handouts_140214_04-j.pdf
A rough translation can be found here:
https://docs.google.com/document/d/1WCKXdZPV9_OgPnOeVNrspzJi-SM4DbZZ9ejBCFD8AQo/edit?usp=sharing
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