[Video available] Confirmation of d...
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[Video available] Confirmation of deposits at the bottom of the Unit 1 containment vessel TEPCO Fukushima Daiichi Nuclear Power Plant Taken by TEPCO with a robot
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4 comments 4Sediments confirmed underwater at the bottom of the Unit 1 containment vessel (lower right) = Provided by TEPCO Holdings
TEPCO announced on the 9th that it was confirmed that a large amount of deposits had sunk in the water as a result of taking a picture of the bottom of the Fukushima Daiichi Nuclear Power Plant Unit 1 containment vessel in Fukushima Prefecture with a robot. Whether or not the deposit is molten nuclear fuel (debris) cannot be determined at this time. In water, a high radiation dose of about 1 to 2 Sv / h was measured. In the future, another robot will be introduced to collect sediment and investigate debris. This survey was conducted on the 8th and 9th. A robot with a camera was remotely controlled to submerge it in the water to shoot images. A deposit about 90 cm thick was found near the disk-shaped structure on the side of the bottom of the containment vessel. It was also seen that the deposits rolled up in the water and that something like oil was floating on the surface of the water. Radiation doses of 1-2 Sv / h were measured in the range investigated on the 8th. In the previous survey in March 2017, a maximum of 11 Sv / h was measured at another location. A TEPCO representative explained at a press conference on the night of the 9th that it is difficult to determine the color and properties of sediments at this time. "I don't know if the deposit is debris," he said.
The purpose of the series of investigations is to collect information on the inside of the containment vessel for the removal of debris, which is considered to be the most difficult task in decommissioning work. In addition to filming the video, the robot introduced this time has been completed by attaching rings called "guide rings" that will be the path of the robot to be introduced in the future at four locations. In the future, TEPCO will introduce multiple robots with different uses such as nuclide analysis, sediment suction, and distribution grasping in order. It is believed that almost all of the fuel in the reactor pressure vessel of Unit 1 had melted down, but debris could not be confirmed for Units 1 to 3 where the core melted. (Video provided by TEPCO Holdings)
Last updated: Fukushima Minpo
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