Saturday, November 9, 2013

Fukushima Unit 4 Log

Fukushima Unit 4 Log


November 2013

Fukushima Daiichi Unit 4 Fuel Removal Underwater Camera November 19, 2013


Fukushima Daiichi Unit 4 Fuel Removal Underwater Camera November 19, 2013

June 2013




Radioactive route: Journalists in protective gear are taken to the No. 4 reactor building at the Fukushima No. 1 nuclear plant on March 6. (Photo:  AP)
This photo (date unknown) shows roof of unit 4 all cleared and construction of side structure to hold fuel removal crane



May 2013
Video of spent fuel pool 4 shows debris blocking circulation. While it is not a mass of rebar and horror like pool 3 where the crane eviently fell in, the edge of one rack is missing, and a lonly fuel rod which does not appear to be in a rack has it's handle bent, and turned 90 degrees from all the other fuel rod structures.


status of Unit 4 operating floor including spent fuel pool 1 / 2351:31May 7, 2011



Date unknown, roof of unit 4 has been removed, and floor is being cleared of debris with orange crane. Yellow object is reactor cap., crane is over the reactor opening, the green gantry is over the spent fuel pool


Shows roof in the process of being removed

View looking south, spent fuel pool is at upper right, cleaned up. Main roof crane has been removed. Not sure what the green crane at north east of building is for. 

TEPCO-Handout-Fuksuhima-Reactor-4-Image
view looking north at south side showing big hole in 3rd floor, roof structure about half removed.

This shows how north wall was bent out. The South wall was completely blown out indicating that the explosion might have been closer to the fuel pool side of the building.

View from outside of southwest wall showing how it buckled outwards

4/2012

http://enformable.com/2012/04/tepco-to-begin-operations-to-prepare-for-spent-fuel-removal-at-reactor-4/

TEPCO released plans for workers to begin preparations for more intensive work at the Number 4 reactor. Experts around the world have warned of the extremely compromised state of the damaged building that holds over 1,500 fuel rods.
As reported last week, TEPCO will begin attaching a special crane to take the fuel out of the pool and constructing a cover to prevent the spread of radioactive materials from the building. The cover will be 31 meters long and 69 meters wide and 53 meters high.
At Reactor 1 the cover was constructed to enclose the entire reactor building, however at Reactor 4, the structure will cover only the upper part of the pool for the reactor.
The cover is expected to be completed by autumn next year. Spent nuclear fuel will then be removed from the pool and stored on the plant compound.
Note: 11/2013, they were actually preparing to remove fuel by November of 2013, pretty much on schedle, and the finished project looks like the diagrams)
Inspection of reactor core pool
http://photo.tepco.co.jp/library/120423_01/120423_04.jpg
Inspecting spent fuel pool with plastic cover

Putting cover on spent fuel pool, roof still overhead




Water injection - concrete pump installed. All but two east wall panels are blown out, with extensive damage on all floors. North wall is buckled towards center to building, with a large hole on floors 2 and 3. Roof covering above gridwork has been blow off or towards the north edge of the roof. South edge of roof has been blown away, along with entire top floor vertical which is missing.

View of east side looking towards water, with water injection concrete pump truck

Reactors 3 and 4 after explosions and several fires. All but 5 panels of 18 (6 x 3 floors) have been blown out on the west side. Unit 3 roof has completely collapsed, including main roof crane which collapsed on top of reactor core. All west side concrete vertical pillars on refueling deck were completely blown out and fell over, not just the wall panels, indicating a much more violent explosion than either unit 1 or 4. 

In this March 24, 2011 aerial photo taken by small unmanned drone and released by AIR PHOTO SERVICE, the crippled Fukushima Dai-ichi nuclear power plant is seen in Okumamachi, Fukushima prefecture, northern Japan. From top to bottom, Unit 1 through Unit 4.(Air Photo Service Co. Ltd., Japan)March 24, 2011 aerial photo taken by small unmanned drone
Reactor No 4 spent fuel Pool Exposed after explosion, steam coming out of the spent fuel pool indicating it is overheating. 


In this Thursday, March 24, 2011, photo available Friday, April 1, 2011, inside of the Unit 4 at the Fukushima Dai-ichi nuclear power plant is seen in Okumamachi, northeastern Japan. Steam comes out of debris by a crane device, in green, at the unit.
An overview shows smoke rising from the interior of reactor No. 4 at the Fukushima Daiichi nuclear power plant complex in this still image taken from a March 24, 2011 handout video released on April 1, 2011.An overview shows smoke rising from the interior of reactor No. 4 at the Fukushima Daiichi nuclear power plant complex in this still image taken from a March 24, 2011 handout video released on April 1, 2011. All equipment except for the green crane appear to be severely bent and damaged by a very large and powerful explosion(s).

http://www.ratical.org/radiation/Fukushima/images/111211d.html

View of southwest corner showing green sfp crane, and bowed out section of south wall that was not blown out.



Containment vessel dome, reactor 4, Fukushima Daiichi nuclear power plant


This flight shows that the wall panels were made of rebar-reinforced concrete that was shattered by a powerful explosion, rather than just blown out like building 1 which had steel panels evidently designed to blow out like US reactors which were designed with tornados in mind.

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