Thursday, December 19, 2013

Fukushima Unit 1 Log

8/11/2015

Nuclear Watch: Fukushima TEPCO abandon 2 robots + RAW Footage + Update 4/20/2015
https://www.youtube.com/watch?v=kBnWjirhRAQ

Robot gets stuck on grid in primary containment vessel. Radiation of 9-10 SV/Hr, enough to fry electronics. 1 SV/hr is enough to kill a human in 1 hour.


Development of a technology to investigate inside...
irid.or.jp/wp-content/uploads/2015/04/20150413_e.pdf

“Development of a technology to investigate inside the Reactor Primary Containment... the pedestal inside Unit 1 ... inside the Primary Containment Vessel ...


March 2015 Simplyinfo 1 year report:

Unit 1 received a scope inspection into the containment structure in previous years that had limited usefulness. Both scopes and robots have been sent into the torus room of unit 1 more recently. These have discovered some areas where there is evidence of damage, high heat and high radiation. Human entries into the reactor building have found obvious damage but nothing that became a piece of major new evidence. Closer camera inspections of the unit 1 refueling floor did find that the concrete reactor cover was partially dislodged. The extent of this may not be fully understood until they clear the debris off of unit 1′s refueling floor. The muon scan of unit 1 that will attempt to image the reactor vessel to determine if any fuel remains within it began in February 2015. This work should be completed in mid-March 2015. A robot inspection inside the containment structure of unit 1 (see above completion) is planned for this spring for unit 1. If successful, this inspection could give significant clues to the extent of the meltdown damage.

Explosion


Roof collapsed down, sides blown out. Roof crane fallen down. Fuel storage pool covered in debris





Fukushima Daiichi Unit 1 and Unit 2 exhaust stack









http://www.japantimes.co.jp/news/2013/11/14/national/leaks-seen-under-reactor-1-containment-vessel/#.Uoas5MQ_u3e
Nov 14, 2013

Akira Ono, chief of the Fukushima No. 1 plant, said of the second leak that there is another pipe above the suppression chamber and the vent pipe, and it appears that the water is leaking from around that pipe.
But Ono said it is still unknown where exactly the leak is located, and that it is conceivable the water is coming from the containment vessel.
Still, “these are significant findings to help” find the precise locations of the leaks, he said.
The remote-controlled boat was in tainted water inside the torus room that contains the suppression chamber. Radiation levels inside the torus room are running between 0.9 to 1.8 sieverts per hour, dangerously high for human exposure.
http://www.japantimes.co.jp/news/2013/12/18/national/japan-lacks-decommissioning-experts-for-fukushima-no-1/#.UrNIzPRDvgx






Japan lacks decommissioning experts for Fukushima No. 1

International team needed, the sooner the better: experts

BY YURI KAGEYAMA
AP






Japan is incapable of safely decommissioning the devastated Fukushima No. 1 nuclear plant alone and must stitch together an international team for the massive undertaking, experts say.





At Fukushima No. 1, there is the daunting challenge of taking out cores that suffered meltdown,

e cleanup at Fukushima No. 1 will be more difficult than Three Mile Island because the damage is more extensive, involving three reactors instead of one, and more serious because of the greater damage from the bigger explosions.

decommissioning of two reactors similar to Fukushima’s began in 2009 at the Hamaoka nuclear plant in Shizuoka Prefecture, but it is in the early stages and is expected to take nearly 30 more years.



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