The reactor building is among the abandoned relics of Britain's 1950s nuclear arms race, sitting behind barbed wire at the now renamed Sellafield site.
The reactor building cover will be installed as an emergency measure to prevent the dispersion of radioactive substances until mid- to long term measures, including radiation shielding, are implemented.
NHK, the Japanese government news station, broadcast that“[g]roundwater is flowing into the reactor buildings and becoming tainted with radioactive materials.”.
Besides these, he was engaged in other work, such as cutting and replacing piping in the turbine building and the reactor building, where the radiation dose level was also considerably high.
What is particular in the case of Unit 4, is that not only the reactor building top floor, but also the walls of the floor of the spent fuel pool embedded within, were blown by the explosion.
The basements of the reactor buildings were damaged in the earthquake, which caused them to crack, and it has become possible for groundwater to flow into them through these cracks.
The equipment under development is to be used to decontaminate the second and third floors of the reactor building which have not been decontaminated yet.
The findings revealed that the standing tree samples showed a similar distribution trend of the measured Cesium-137(Cs-137), Strontium-90(Sr-90), and Tritium(H-3) highly concentrated around the reactor buildings and it was also similar to that of air dose rate.
To remove fuel from the spent fuel pool of Unit 3, where the reactor building was severely damaged, it was essential to remove large rubbles from the operation floor of Unit 3 nuclear reactor building.
Taking into consideration seismic resistance, measures to prevent exposure, and tsunami resistance, we are locating the filter vent room underground close to the reactor building of Unit 4.
But a hydrogen explosion on 15 March 2011 blew the walls and roof off the reactor building, leaving it vulnerable to further damage from earthquakes.
原子炉建屋1階(天井高7~8m)では、これまでに床面など低い位置での除染がすでに行われています。
On the first floor of the reactor buildings(with a ceiling height of 7-8 m), decontamination has been carried out for low places such as floor surfaces.
Hydrogen explosion prevention measures We have created procedures for opening holes in reactor buildings as a measure to discharge leaked hydrogen from reactor buildings and prevent hydrogen explosions there.
The T-Hawk was able to allow the nuclear engineers to see in real time into the reactor buildings from angles that an overhead satellite or plane could not see.
The robot is due to be used to decontaminate the high places on the first floor in the reactor building at the Fukushima Daiichi NPS Unit 3 as early as November this year.
The operators decided to vent the steam from the pressure vessel- not directly into the environment, but into the space between the third containment and the reactor building(to give the radioactivity in the steam more time to subside).
Regarding the“frozen soil wall” made to cut off groundwater from flowing into the reactor building having only a limited effect despite the over 34.5 billion yen spent on it, the paper argued,“An examination into how long it should be used is necessary….
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