JAPAN ATOMIC INDUSTRIAL FORUM, INC.

for Japanese

ATOMS in JAPAN

1 December, 2015

TEPCO to Dismantle Top of Unit 2 Reactor Building at Fukushima Daiichi

On November 26, the Tokyo Electric Power Co. (TEPCO) released a report on the progress of decommissioning work at the Fukushima Daiichi Nuclear Power Plants.

The incineration facility for miscellaneous solid material wastes at Fukushima Daiichi

Unlike the other three units, Unit 2 did not suffer a hydrogen explosion, so the upper operating floor of its reactor building remained intact. TEPCO had considered various options for dismantling and remodeling the top of the building before removing debris from the reactor, as well as spent fuel from the pool. It finally concluded that dismantling everything above the top floor was desirable from the viewpoints of maintaining work safety, mitigating its influence outside the Fukushima Daiichi site, and reducing risk.

TEPCO is now mulling over two different ways to remove the spent fuel and fuel debris: (1) using a common container for both, with a single container installed in the upper part of the operating floor of the reactor building, and (2) using two separate containers, one for the spent fuel and the other for the debris.

The power company had drawn up and compared several plans, each with a differing extent of dismantling to be carried out. Eventually, it determined that the best option would be to dismantle the entire upper portion of the building using either of the above two concepts. Even after the entire upper part of the building is dismantled, the increased amount of radioactive materials to be released from the four reactor buildings (Units 1 to 4) would still be within the scope of variations currently experienced.

TEPCO will now develop a detailed work plan, construct a mock-up and test the plan, initiating work based on that evaluation. It aims to decide on a removal plan for the spent fuel and debris—that is, whether to use one or two containers—in the first half of FY17 (April to September 2017). To that end, the company will begin dismantling and structural work on the building during the current fiscal year, which ends in March 2016.

According to the medium-term and long-term roadmap toward decommissioning for Fukushima Daiichi, spent fuel is to start being removed from the spent fuel pool of Unit 2 in FY20 (beginning in April 2020).

Meanwhile, as for measures to deal with the contaminated water emanating from the plant, TEPCO confirmed that the concentration of radioactive materials in the port seawater had started to decline after a shielding wall on the ocean side of the Fukushima Daiichi NPPs was completed on October 26. The data show that the wall is starting to be effective.

As for miscellaneous solid material waste, including used protective garments, TEPCO has finished constructing an incineration facility for them, and began tests using simulated waste on November 25. The power company will now carry out additional testing using actual contaminated waste. It hopes to start full operation by next March 31, the end of the current fiscal year.

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

18 November, 2021
METI Minister Speaks to IAEA International Conference on Decade of Progress Since Fukushima Daiichi Accident
15 November, 2021
Nuclear Energy’s Contribution to Achieving SDGs
8 November, 2021
COP26: Prime Minister Kishida Announces Additional Contribution of USD10 Billion for Climate Change Measures
30 October, 2021
Reelection of Suttsu Mayor Means Literature Investigation for HLW Disposal Will Continue
21 October, 2021
Kishida Makes First Visit to Fukushima Since Becoming Prime Minister
15 October, 2021
LDP Adds SMR Development and Nuclear Fusion to NPP Restarts in Its Policy Manifesto
7 October, 2021
Kishida Administration Inaugurated, with New METI Minister Hagiuda Holding Press Conference on Taking Office
6 October, 2021
IAEA Holds 65th General Conference in Vienna, with Japanese Minister of State for Science and Technology Delivering Statement in the General Debate
30 September, 2021
JAEC Releases 2020 White Paper on Nuclear Energy
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
▲TOP