Tokyo Electric Power Company have begun a 2-day endoscopic examination of the inside of a damaged reactor at the Fukushima Daiichi nuclear plant. TEPCO says through the operation it wants to confirm that the amount of fuel that melted and fell to the bottom of the containment vessels is being cooled properly.
In January TEPCO attempted the first survey of the PCV at Reactor 2, but were unable to locate the water at the bottom of the vessel, and failed in an attempt to get clear images from inside damaged reactors using fiber-optic lines.
Photos taken in January showed parts of walls and pipes inside the containment vessel, but the images were blurred, probably due to radiation and vapor from contaminated water, leaving the details unclear.
TEPCO had estimated that approximately 4.5 meters of water had accumulated on the bottom of the PCV, but on Monday’s endoscope mission, the water was found to be less than 60 cm.
The melted nuclear fuel from the reactor pressure vessel is not visible.