Where are they coming from? Probably from the containment vessel. That means it will be much more difficult to keep enough water, vital to cooling the nuclear material melted on the floor of the vessel, in place, not to mention the headaches coping with even more radiactive water will cause Tepco and Japan.
Tokyo Electric Power Co. says it has found water leaks around the bottom of the containment vessel in the reactor 1 building at the Fukushima No. 1 nuclear plant, the first time leaks have been detected near or possibly in any of the three containment vessels that experienced a meltdown in March 2011.Yup.
Tepco said Wednesday it was using a camera-equipped remote-controlled boat to check conditions when it found the two leaks.
One leak came from a rupture in a sand-cushioned drain pipe installed at the bottom of the containment vessel. The pipe is not directly connected to the containment vessel and is used to drain condensation that forms on the vessel’s surface.
Another leak was confirmed just above the suppression chamber, which is a huge donut-shaped chamber connected to the containment vessel, and one of eight vent pipes.
The suppression chamber contains water and is used to reduce pressure inside the containment vessel through vent pipes.
Akira Ono, chief of the Fukushima No. 1 plant, said of the second leak that there is another pipe above the suppression chamber and the vent pipe, and it appears that the water is leaking from around that pipe.
But Ono said it is still unknown where exactly the leak is located, and that it is conceivable the water is coming from the containment vessel. [my bolding]