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Likely Melted Fuel Heap Found Inside Fukushima Daiichi’s Reactor 3 Shows Future Removing Difficulties

Underwater robot finds likely melted fuel heap inside Fukushima reactor

melted fuel 23 july 2017 3This image captured by an underwater robot provided by International Research Institute for Nuclear Decommissioning on Saturday, July 22, 2017 shows heaps of solidified lava-like rocks believed to be nuclear fuel.

 

TOKYO (AP) — Images captured by an underwater robot showed massive deposits believed to be melted nuclear fuel covering the floor of a damaged reactor at Japan’s crippled Fukushima nuclear plant.

The robot found large amounts of solidified lava-like rocks and lumps in layers as thick as 1 meter on the bottom inside of a main structure called the pedestal that sits underneath the core inside the primary containment vessel of Fukushima’s Unit 3 reactor, said the plant’s operator, Tokyo Electric Power Co.

On Friday, the robot spotted suspected debris of melted fuel for the first time since the 2011 earthquake and tsunami caused multiple meltdowns and destroyed the plant. The three-day probe of Unit 3 ended Saturday.

Locating and analyzing the fuel debris and damage in each of the plant’s three wrecked reactors is crucial for decommissioning the plant. The search for melted fuel in the two other reactors has so far been unsuccessful because of damage and extremely high radiation levels.

During this week’s probe, cameras mounted on the robot showed extensive damage caused by the core meltdown, with fuel debris mixed with broken reactor parts, suggesting the difficult challenges ahead in the decades-long decommissioning of the destroyed plant.

TEPCO spokesman Takahiro Kimoto said it would take time to analyze the debris in the images to figure out debris removal methods.

http://mainichi.jp/english/articles/20170723/p2g/00m/0dm/033000c

Melted nuke fuel images show struggle facing Fukushima plant

melted fuel 23 july 2017 2What is believed to be nuclear fuel debris has accumulated at the submerged bottom of the containment vessel in the No. 3 reactor at the Fukushima No. 1 nuclear power plant in an image taken on July 22. Part of the collapsed metal scaffolding is seen at back right.

 

Images captured on July 22 of solidified nuclear fuel debris at the bottom of a containment vessel of the crippled Fukushima No. 1 nuclear power plant show the enormity of decommissioning of the facility.

Plant operator Tokyo Electric Power Co. said it will closely study the images from the No. 3 reactor’s containment vessel to determine the spread and amount of nuclear fuel debris.

After analysis, TEPCO will decide on a policy to retrieve the fuel debris.

The government and TEPCO plan to start the retrieval process in one of the three crippled reactors at the plant from 2021.

It will be a formidable task, given that a method of recovering debris that is stuck to the floor has yet to be considered.

The recent images were taken by a submersible robot, which was sent into the containment vessel on July 19, 21 and 22.

The No. 3 reactor’s containment vessel is filled with water to a depth of 6.4 meters.

On the final day, the remote-controlled robot was dispatched to the deepest part of the containment vessel.

The images showed that pieces that fell from the structure and deposited material accumulated to a height of about 1 meters at the bottom of the containment vessel.

In particular, what is believed to be nuclear fuel debris is scattered in the form of rocks in the area directly beneath the pressure vessel.

The latest investigation has confirmed TEPCO’s assumption made through analyses that most of the reactor’s nuclear fuel melted through the pressure vessel and accumulated at the bottom of the containment vessel.

It also discovered that the nuclear fuel debris has spread throughout the containment vessel.

The images marked the first confirmation through a robot probe of a large amount of nuclear debris in any of the embattled No. 1 through No. 3 reactors.

http://www.asahi.com/ajw/articles/AJ201707230012.html

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July 25, 2017 - Posted by | Fukushima 2017 | , , ,

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