JAPAN ATOMIC INDUSTRIAL FORUM, INC.

for Japanese

ATOMS in JAPAN

10 May, 2019

Demonstration Made by MHI and IRID of Robot Arm to Remove Fuel Debris from Fukushima Daiichi

On April 24, Japan’s Mitsubishi Heavy Industries, (MHI) and the International Research Institute for Decommissioning (IRID), based in Tokyo, showed members of the press a version of a robot arm that they had developed to remove fuel debris from the Fukushima Daiichi Nuclear Power Plants, damaged by a tsunami in March 2011.

The robot arm, shown at MHI’s Kobe Shipyard & Machinery Works, measures 7.1m in length.

Previous AIJ article on the issue:

https://www.jaif.or.jp/en/draft-of-new-technical-strategy-for-fukushima-daiichi-released-showing-direction-for-fuel-debris-removal/

According to the so-called mid-and-long-term roadmap toward the eventual decommissioning of the Fukushima Daiichi NPPs, the fuel debris is to be removed in an uncovered state from the side of the reactor containment vessel (CV). To that end, MHI and IRID carried out validation tests three months ago, in February, in which they inserted a robot arm, used to process and hold the fuel debris, into the pedestal (at the bottom of the reactor pressure vessel) via an access rail on the side of the CV.

Separate functions tests of the robot arm and access rail were completed prior to FY2016 (April 2016 to March 2017). This time, at a mock-up at MHI’s Kobe Shipyard & Machinery Works, tests were made of the combination of a robot arm and access rail: the so-called “robot-arm and access-rail method.” MHI and IRID simulated movements of the robot arm on the site, as well as the processing and holding of the fuel debris, putting it into containers and transferring it.

“Before now, individual efforts toward the removal of the fuel debris had proceeded separately. Thanks to the large device, though, the efficiency of those effort should be improved,” explained Senior Manager Naoaki Okuzumi of IRID’s R&D Strategy Planning Department.

Investigations are being carried out of the interiors of each unit’s CVs toward the start of the removal of the fuel debris in 2021. According to an MHI engineer working on the robot arm, “As the technology is still in its fledgling state, we have to improve and perfect it before introducing it at the site.”

For example, the robot arm, measuring only some 6cm in diameter, was designed to bear a load of two tons at the tip, although the precise nature of the fuel debris has not been clarified. Things yet to be determined include the robot arm’s specifications, the specific functions of the tools to be installed, and its resistance to radiation.

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

17 July, 2019
JAEA Resumes HLW Vitrification at Tokai Reprocessing Plant to Reduce Risks Early
17 July, 2019
Fukui Governor Asks METI and MEXT to Use Decommissioning to Spur Industrial Development of Prefecture
17 July, 2019
TEPCO to Use Robots in Investigating Fukushima Daiichi NPPs, Aiming to Remove Spent Fuel from Unit 1 Pool Next Year
18 June, 2019
MHI Tests Anti-Explosion Robot for Plant Inspections, Capitalizing on Experience Gained in Nuclear Accidents
13 June, 2019
Training and Simulations Mark Flawless Preparation for Start of Fuel Removal from FBR Monju Reactor Core in October
13 June, 2019
Japan’s Cabinet Approves FY18 White Paper on Energy Policy, Seeking Low-carbon Society to Meet Paris Agreement Goals
5 June, 2019
TEPCO Considering New Plan to Remove Spent Fuel from Fukushima Daiichi-2
31 May, 2019
NRA Orders Kansai EP to Backfit Takahama and Other NPPs Based on New Volcano Impact Information
31 May, 2019
Local Governments Asks National Government to Help Get Overseas Import Regulation on Foods Withdrawn or Relaxed
24 May, 2019
Japanese Power Companies to Cooperate with Each Other to Complete Anti-terrorism Facilities More Quickly
▲TOP