Fukushima Daiichi NPS Prompt Report 2013

This is follow-up information on the "water leak at a tank in the H4 area in Fukushima Daiichi Nuclear Power Station" found on August 19.

We found streaky traces of flows on the wall surface of a drainage channel located east of the H4 area tanks. In response, we measured surface dose equivalent rates at this location, and the maximum rate was 6.0mSv/h (γ and β rays (70μm dose equivalent rate)).

We will conduct a detailed investigation and evaluation concerning these traces since the above information seems to indicate the possibility that contaminated earth and sand, etc. may have flowed into the drainage channel.

When water leaking this time was found, no water was found flowing on the surface of the ground near the above drainage channel.