Underwater Robo: Work completed in the containment vessel: Fukushima Daiichi Nuclear Power Plant Unit 1
-Mounting the guide ring-
February 10, 2022
TEPCO:
On the 9th, the initial work of the underwater robot was completed.
An underwater robot was introduced to investigate the inside of the reactor containment vessel of Fukushima Daiichi Nuclear Power Station Unit 1.
Introducing an underwater robot:
We succeeded in installing a guide ring so that the robot can move in the stagnant water.
Guide rings were installed at four locations on the wall of the containment vessel.
It will be the path for a total of five types of subsequent robots to be introduced in the future.
Internal investigation of the reactor containment vessel:
Over half a year
Checking the status of the melted down nuclear fuel,
Internal 3D mapping using ultrasonic waves,
We plan to proceed with sampling of sediments.
This work:
I also took a picture of the internal situation,
Sandy deposits and debris covering debris,
Floating matter of oil on the surface of the stagnant water was also confirmed.
Radiation dose in water:
The radiation dose in the water was 1-2 Sv / h.
Analyze the video and scrutinize the future process.
Kahoku Shimpo / ONLINE NEWS
https://kahoku.news/articles/20220209khn000034.html
The operator of the damaged Fukushima Daiichi nuclear plant has released images of deposits under the water inside the facility’s No.1 reactor.
Tokyo Electric Power Company,
or TEPCO, began a robot probe inside the reactor’s containment vessel on Tuesday.On Wednesday,
the utility explained that the first robot had finished securing a passageway in the water for other robots.TEPCO also released video
taken by the robot’s camera. It shows the robot installing a ring,which will keep cables of robots from getting stuck within structures inside the containment vessel.
The video also shows matter accumulated around the entrance of a pipe at the bottom of the containment vessel.
TEPCO says
it cannot determine at this stage whether the matter is molten fuel debris.The utility plans
to retract the first robot on Thursday and put the second one in to take more precise images as soon as preparations are finished.The Fukushima Daiichi plant
suffered a triple meltdown in the March 2011 earthquake and tsunami.Previous surveys confirmed
the presence of deposits believed to be fuel debris in the No. 2 and No. 3 reactors, but not in the No. 1 reactor.NHK WORLD-JAPAN News