[Reactor1] 5.2 Sv/h on the first floor

Tepco conducted robot survey in reactor1 building TIP room and South area on the first floor. (11:40 ~ 15:47 of 7/4/2012)

Tepco used 4 robots (2 Quinces and 2 PackBots) but couldn’t have them open the door to the TIP room though they managed to insert the key.

[Reactor1] 5.2 Sv/h on the first floor 2

They couldn’t enter TIP room ,but near the penetration area on the floor beside TIP room, they measured 5.15 Sv/h, which was the highest reading in this investigation. This is where the pipe coming through floor.

Last June, steam was observed coming up from this place.

[Reactor1] 5.2 Sv/h on the first floor

7 nuclear workers were involved in the investigation. The planned dosage was 6mSv, but Tepco’s spokesman announced it was 0.76Sv in total. Because this is extremely high level of dosage, we need to verify if it was not misstatement.


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You can actually see the white noise of radiation in the pictures.


[Reactor1] 5.2 Sv/h on the first floor 3



↓ Route and radiation level at each point

[Reactor1] 5.2 Sv/h on the first floor 4


[Reactor1] 5.2 Sv/h on the first floor 5


[Reactor1] 5.2 Sv/h on the first floor 6


[Reactor1] 5.2 Sv/h on the first floor 7


For the question “Why Tepco needs to investigate inside of TIP room”, actual Fukushima worker Happy11311 answered like this below,



In TIP room, there are variety of nuclear instrumentation and pipes connected to inside of the vessel, Tepco is seeking the way to look inside of the vessel by using it like they did in reactor2. Also, they need to check if melted fuel comes up through the pipes.






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