The air in the Unit 1 reactor building has been filtered enough to allow workers to enter the building with respirators rather than supplied air tanks. TEPCO has posted a video which shows the air filtration system. http://www.youtube.com/watch?v=6VtwFsKT93s Radiation surveys are being taken to map out the radiation levels within the building. The radiation levels will determine the time and precautions workers will take when working in an area. One task for today is to calibrate the gauge which provides an indication of the reactor containment vessel water level. They will be inspecting the conditions of pipes and valves which will be used for to cool the reactors with the cooling system being built.
A video of the Unit 4 SFP has also been released. The video was taken with a submersible camera which was attached to the end of the boom which is injecting water into the pool . It shows the debris which has settle on top of the fuel racks. http://www.youtube.com/watch?v=qCY0xQRZ1UY At 41 seconds, the bales on the top of the fuel assemblies are being videoed. The surface temperature of the pool is about 81° C.
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