JAPAN ATOMIC INDUSTRIAL FORUM, INC.

for Japanese

ATOMS in JAPAN

4 June, 2018

TEPCO Opens Up Space in Common Pool at Fukushima Daiichi to Receive Spent Fuel from Unit 3

On May 31, the Tokyo Electric Power Co. (TEPCO) released a progress report on the decommissioning at the Fukushima Daiichi Nuclear Power Plants.

“X-6 penetration” at Unit 5

Four days earlier, on May 27, the power company began transferring some of the spent fuel currently stored in a common pool to a temporary facility at the site, for storage in dry casks, to create enough space in the pool to store spent fuel taken from the Unit 3 spent fuel pool when that is eventually removed.

At the temporary storage facility, TEPCO will pack the spent fuel in dry casks providing shielding and heat removal (with natural air circulation outside the casks) and store it under stable conditions.

By August, 483 spent fuel assemblies from the common pool will have been transferred to the facility using seven transport and storage casks, in anticipation of the arrival of 566 fuel assemblies (including unused 52 assemblies) from Unit 3.

On May 11, a problem was found at Unit 3—where a fuel handling machine has been in trial operation since March—inside a control panel for a crane used for moving fuel transportation containers to the ground. TEPCO nevertheless aims to begin removing fuel from the spent fuel pool around mid-FY18, as initially planned.

TEPCO will determine a method for removing fuel debris from the first unit by FY19 (April 2019 to March 2020), and the status of that effort was also included in the status report on May 31. The approach is to proceed after heightened understanding is made of internal conditions, the nature of the debris, and the effects when removed.

As that has not yet been fully completed, though, the effort will proceed gradually and incrementally, as follows: first investigating the interiors of the primary containment vessels (PCVs) through sampling, then carrying out small-scale removal of debris, followed by large-scale removal.

As for small-scale fuel removal, one promising method seems to be using a “X-6 penetration” rail to access the interiors of the PCVs (found in all the units) from the side, in order to exchange the control rod drive mechanism (CRDM). That method is already being used for inserting investigation devices into PCVs.

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, Jan. 2020)

23 January, 2020
“The current situation at Fukushima Daiichi NPS” -From 3.11 toward the future- (ver, Jan. 2020)07:47

Recent News

12 February, 2020
Registration Opens for the 53rd JAIF Annual Conference
10 February, 2020
NRA Exchanges Views with Tohoku Electric President, Who Says Major Turning Point Is Approaching Toward Restart
10 February, 2020
Nuclear Reform Monitoring Committee Cites Major Progress at TEPCO, Giving High Marks to Its State of Improvement on Priority Issues
5 February, 2020
Interview with Two Experts: Former UKAEA Chair Says “Political Intentions Exist Behind Unfounded Fears and Rumors”
5 February, 2020
2021 Nuclear Recruiting Events Held in Tokyo on February 1, and in Osaka on the 16th
30 January, 2020
ALPS Achieves Treatment Volume of One Million Tons in Less than Seven Years
29 January, 2020
JAIF President Takahashi Gives Press Briefing, Describing Court Order Halting the Operation of Ikata-3 as “Regrettable”
23 January, 2020
Finishing Mission in Japan, IAEA’s IRRS Points Out Importance of NRA’s Communicating with Nuclear Industry
21 January, 2020
Evacuation Orders for Futaba, Okuma, Tomioka Towns to Be Partially Lifted in March, with JR Joban Line to Be Completely Reopened for Service
16 January, 2020
Japan’s Nuclear Power Plant Capacity Factor Stood at Just 21.4 Percent Last Year
▲TOP