JAPAN ATOMIC INDUSTRIAL FORUM, INC.

for Japanese

ATOMS in JAPAN

15 November, 2016

All Outer Wall Panels Removed at Fukushima Daiichi Unit 1 Reactor

On November 10, the removal was completed of all eighteen panels covering the outer walls of the reactor building at Unit 1 of the Fukushima Daiichi Nuclear Power Plants, owned by the Tokyo Electric Power Co. (TEPCO). The work was carried out in preparation for the removal of nuclear fuel from the spent fuel pool at the unit. It began on September 13, with the final panel removed in the morning of November 10.

The wall-cover panels were removed. ©TEPCO

Throughout the period, no significant changes were recognized in concentrations of radioactive materials, either by dust monitors or at monitoring posts at the boundaries of the NPPs.

The six panels covering the roof of the building had been removed from July to October 2015, in preparation for the removal of the spent fuel from Unit 1. In August and September of this year, dust-suppressing agents were sprayed to prevent radioactive materials from scattering from the side, and removal of the wall panels began on September 13.

According to the medium-term and long-term roadmap toward the decommissioning of Units 1 to 4 of the Fukushima Daiichi, revised in June 2015, once the building cover of Unit 1 is dismantled, it will take two years for debris to be removed from the upper part of the operating floor and for a fuel-removal cover and fuel-handling machine to be installed. The fuel removal is slated to begin around the end of fiscal 2020 (ending March 2021).

TEPCO is currently proceeding with an investigation on the state of debris beneath the collapsed roof, at the same time it removes the wall panels, and in anticipation of the removal of the debris. A camera and dust-sampling device—both hung from a crane at the upper part of the reactor building—are recording conditions and gathering data on the concentration of radioactive materials in the air.

Contaminated Water Measures…

Meanwhile, turning attention to measures to deal with contaminated water at the site, the Agency for Natural Resources & Energy (ANRE) under the Ministry of Economy, Trade and Industry (METI) convened an expert panel on November 11. The panel focused on the water—now stored in tanks—being treated by the Advanced Liquid Processing System (ALPS), comprising equipment for multi-nuclide removal.

tanks at Fukushima DaiichiAs the contaminated water successfully treated by ALPS still contains tritium, a report was drawn up in June on a technological evaluation of disposal methods for it. In response, the ANRE panel will comprehensively consider how to handle the water, based on the technological information in the report. It will also consider the issue from a societal point of view, including the problem of unfounded fears and rumors.

TEPCO has released materials showing that the volume of contaminated water treated by ALPS reached about 690,000 cubic meters as of October. There are concerns about the risk of storing such a huge amount of water for even longer, possibly hindering decommissioning activities.

The report compiled in June technologically evaluated five methods for dealing with the tritium-bearing water, namely, injection into a stratum, release into the sea, steam discharge, hydrogen discharge and land burial.

Because the increasing number of tanks threatens decommissioning work at Fukushima Daiichi, the Nuclear Regulation Authority (NRA) of Japan has asked TEPCO to explain its intentions on the matter as soon as possible. NRA Chairman Shunichi Tanaka has expressed his view that it should be released into the sea, but local fisheries object to that plan on the grounds that it would generate unfounded fears and rumors.

For more details on contaminated water at Fukushima Daiichi, including the tritium issue, see the following video (released in December 2013):

Comment

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

SNS facebooktwitter

NPPs Map

Video

Grossi on Fukushima: Marking a Decade Since the Accident

10 March, 2021
Grossi on Fukushima: Marking a Decade Since the Accident04:11

Recent News

17 September, 2021
NRA Permits Shimane-2 under New Regulatory Standards
14 September, 2021
IAEA Deputy Director General Evrard Visits Japan in Advance of Safety Review of ALPS-treated Water
1 September, 2021
Evaluation Report Issued by IAEA’s Review Mission to Fukushima Daiichi: First Visit since 2018
24 August, 2021
METI and IAEA Agree on Further Review Missions to Fukushima Daiichi
4 August, 2021
JAEA Restarts High-Temperature Engineering Test Reactor “HTTR”
2 August, 2021
Information about Fukushima Daiichi NPS Water Treatment
28 July, 2021
METI’s Committee Shows Rough Draft of Next Strategic Energy Plan
2 July, 2021
Mihama-3 Restarted After Decade-long Hiatus: First Restart in Japan of a Reactor Operating Beyond 40 Years
28 June, 2021
Mihama-3 Restarts after Decade-long Hiatus
25 June, 2021
New Canada-Japan Partnership Supports Greater Collaboration to Meet Climate Change Objectives and Net-zero Goals
24 June, 2021
METI Issues New Green Growth Strategy Through Achieving Carbon Neutrality
16 June, 2021
ANRE Sticks to “S+3E”
16 June, 2021
Japanese Cabinet Approves Environmental White Paper 2021
16 June, 2021
LDP Parliamentary Association to Reconfirm Position on Utilization of Nuclear Power
16 June, 2021
Fukui Governor Concerned about Deletion of Reference to “Maximum Utilization” of Nuclear Power
14 June, 2021
Working Group on Offshore Release of Treated Water Meets in Miyagi
14 June, 2021
NRA Considers Policy on Treating Slurry from ALPS, with Local Understanding Essential
11 June, 2021
Japanese Cabinet Approves Energy White Paper 2021
11 June, 2021
Government Omits Description of “Maximum Utilization” of Nuclear Power
9 June, 2021
MNF Hopes to Resume Fuel Production as Early as November
▲TOP