JAPAN ATOMIC INDUSTRIAL FORUM, INC.

for Japanese

ATOMS in JAPAN

15 February, 2019

TEPCO Makes Contact with Debris at Fukushima Daiichi-2

On February 14, the Tokyo Electric Power Co. (TEPCO) released a video showing a device with two “fingers” at the end lifting pebble-shaped deposits suspected of being melted nuclear fuel (debris) at the bottom of a reactor primary containment vessel (PCV). The recording was made during an investigation undertaken on the 13th at the Fukushima Daiichi-2 Nuclear Power Plant (BWR, 784MWe). The pebble deposits, shown clearly, were of different shapes and sizes. Of the ten locations where the device made contact with them, they could not be moved at three.

Engineers at the site

The deposits that could not be moved appeared to be in a state like lava. The limited range of the investigation showed them to most likely be debris that had become affixed and hardened. It is now deemed necessary to develop a new device that can scape or cut them off for removal.

On February 13, TEPCO announced that it had moved deposits at five out of six locations at the PCV bottom. It also succeeded in touching deposits at four spots on the grid of the working scaffold approximately four meters above the PCV bottom, and at two of those spots the pebble-shaped deposits were moved, it said.

The fingers of the device can be opened and closed like a tongs, up to about eight centimeters, and lift an object of up to about two kilograms. This time, the device picked up pebble-shaped lump and rod-like structures of one to eight centimeters, their weights unknown.

For the investigation, the device was hung by a cable from an pipe, and lowered to the bottom of the PCV from a portion of the scaffold that had fallen to the lower part of the PCV. Because the device successfully lifted the deposits, TEPCO believes it is possible to remove them from the PCV.

Comment

This site uses Akismet to reduce spam. Learn how your comment data is processed.

SNS facebooktwitter

NPPs Map

Video

“The current situation at Fukushima Daiichi NPS” -From 3.11 toward the future- (ver, July 2019)

8 July, 2019
“The current situation at Fukushima Daiichi NPS” -From 3.11 toward the future- (ver, July 2019)09:17

Recent News

19 September, 2019
Minister of State for Science and Technology Policy Attends Opening Ceremony of Japan Booth at IAEA General Conference
19 September, 2019
At 63rd IAEA General Conference, Japanese Minister of State for Science and Technology Policy Stresses Need for Science-based Discussions on Decommissioning and Contaminated Water Measures
10 September, 2019
Symposium in Tokyo Looks at Taiwanese Energy Situation, and Discusses Fear and Misinformation about Foods Sourced in Fukushima
10 September, 2019
Kyushu Electric Power Files Decommissioning Plan for Genkai-2 and Seeks Change to Genkai-1 Plan, with Work on Both to Proceed Simultaneously
4 September, 2019
White Paper on Nuclear Energy Features Decommissioning, Accumulation of Technology as “Great Assets” for the Future
29 August, 2019
TEPCO to Decide Fate of Kashiwazaki Kariwa Units 1 to 5 Five Years after Restarting Units 6 and 7
29 August, 2019
TEPCO, Chubu Electric Power, Hitachi, Toshiba Considering Joint Business for BWRs
16 August, 2019
Two-day International Forum on Decommissioning Fukushima Daiichi Focuses on Coexistence and Co-prosperity with Local Communities
16 August, 2019
Proponents for Above-ground HLW Management Lose in Chiba University Debate
9 August, 2019
NRA Exchanges Views with President Sakamoto of RFS, Which Pledges to Make Its Utmost Efforts
▲TOP