It was indicated as much by a tweet on July 3 from a worker currently at Fukushima I Nuke Plant.
No information on how high the radiation of the contaminated water in the basement may be.
The Reactor 3 used MOX-fuel, and the contaminated water that accumulated in the basement got there after it went over the melted (or partially melted) MOX-fuel. The temperature inside the Reactor Pressure Vessel remains high.
High radiation or not, TEPCO seems determined to start the injection of nitrogen into the Reactor 3 Containment Vessel by July 17, which is the deadline by which the step 1 in TEPCO's roadmap, "stable cooling" of the reactors is to be completed. The date has also been indicated by the government to be the day when the government will announce the "reduction" (believe it or not) of the planned evacuation zone.
Extend and pretend. And the bots and carbons alike will have to brave the unknown amount of high radiation at the plant so that the government can "extend and pretend".