The debris was found in the North side of the top, where used to be the operation floor.
When they loaded it onto the remote controlling truck, they measured 540 mSv/h. [...]
From Tepco’s April 22, 2013 release: To prepare for the second phase of protection installation on the spent fuel pool, the steel beam truss debris, etc. which interfere with the work will be removed.
See also: US nuke industry report: Explosions at Fukushima Units 1, 3, 4 may have caused inventory (nuclear rods) to be lost from spent fuel pools -- "Debris" on ground near Unit 3 was extremely radioactive after blast
Published: May 4th, 2013 at 12:00 pm ET
- Gundersen: Extremely radioactive rubble on Fukushima Reactor No. 3 has to be nuclear fuel… from either spent fuel pool or reactor! — Can’t be from simple hydrogen explosion May 5, 2013
- Medical Expert: Hundreds ill after Fukushima nuclear plant rubble burned in major Japanese city — Suffering nosebleeds, problems with eyes, throats and skin — Gov’t: Radiation levels were ‘low enough’ to be safe (PHOTO) May 13, 2014
- AFP: ‘Fukushima reactor site engulfed by steam’ — Kyodo: ‘Something like steam’ coming from unknown source at Unit No. 3 — Tepco: ‘Continuously wafting through the air’ — Work to remove rubble suspended July 23, 2013
- Gundersen on Gamma Rays: “Implies rubble was activated by neutrons, or that activation products like Cobalt-60 are in rubble — Interesting” August 27, 2012
- ZDF Bureau Chief: Very high radioactive dose of 65 microsieverts per hour in Fukushima City — “Informed officials 3 month ago, nothing happened until today!” — Many children pass by everyday (PHOTO) May 17, 2013