A robot has entered Fukushima Daiichi unit 1 first floor again yesterday and measured the radiation as the same place where steam had been found in June. Although unit 1’s temperature has declined from 100°C to 70°C and steam was not observed again, the radiation remains extremely high with 3000 ~ 4700 mSv/h. It is planned that the construction of unit 1’s cover will be completed today.
High radiation levels are still a problem at units 1-3. Unit 1 registered 4.7 Svh at the south air lock door. This has made the 2nd and 4th floors inaccessible. Similar high radiation levels exist at units 2 and 3 hampering the ability to conduct testing or inspection work in or around those two buildings.
http://www.tepco.co.jp/en/nu/fukushi…11014_03-e.pdf “Survey results of pipe penetration on 1st floor of Unit 1 reactor building of Fukushima Daiichi Nuclear Power Station”