Recent content by Sotan

New post on the "Fuel Debris Portal" site. "2025.7.29 Fukushima Daiichi Nuclear Power Station Unit 3 Design Deliberation for Fuel Debris Retrieval Method" There are two links at the bottom of that article, one is the report of a sub-committee regarding fuel debris retrieval (published in March...

New report on Tepco's Fuel Debris Portal site, about the first results of the analysis of the second sample (May 29). >> Link

They completed the second "fuel debris sampling" operation. Link to report I don't want to sound disappointed but... This time it seems they retrieved 0.2g.

Two new posts on the "Fuel Debris Portal" site, dated March 19: - Status of preparations for the second fuel debris trial retrieval from Unit 2 (pdf) - Training at the Kobe Factory for the second fuel debris trial retrieval from Unit 2 (video)

Regarding the results of analyses, quoting from this report mentioned in a previous post, "The results from overall analysis performed at the JAEA Oarai Research and Development Institute (fuel debris surface element distribution, etc.) should be compiled in several months, and the results of...

Fukushima Daiichi Nuclear Power Station Completion of fuel debris trial retrieval from Unit 2 1-page report of November 7

On the "Fuel Debris Portal Site" linked in the previous post there are new reports added, most recent ones from Oct 31. One of them is a video showing the tip/fingers of the robotic arm pinching and grasping a little piece of fuel debris. A short explanation of this operation is here. Then...

A new (at least for me it's new) site by TEPCO with information about the fuel debris and news for Units 1, 2 and 3. It has an English version too. I'm thinking maybe not everyone has found it. FUEL DEBRIS PORTAL SITE Japanese version English version If you check Unit 2, for example, you get...

Looks like they ran into trouble again. "On Sept. 17, TEPCO could not confirm camera images of equipment being used to remove the debris from the No. 2 reactor of the plant, bringing a stop to the project, the utility said."

* Article in Asahi (google translated) reporting the request from Nuclear Regulation Authority to TEPCO "to evaluate the impact of radioactive material scattering outside the site, including the possibility of a hole (that might occur) in the containment vessel due to subsidence of the pressure...

An even better report published on Apr 24 on the NRA meetings page. (Using the page numbers printed at bottom right in the PDF file) - Most impressive, on page 11 you can see a panorama stitched from photos taken inside the pedestal of Unit1. - Page 3: Steel bars exposed, "about 1 m above the...

- A report published on April 4 by Tepco includes many photos taken inside the pedestal of Unit 1 showing the inner walls of the pedestal with exposed rebar but also debris presumed to be CRD housings, CRD housing supports and CRD's, together with more rubble-like and lumpy deposits.

New article (from 5 days ago) on the IAEA site about recent developments at Fukushima Daiichi. It contains a link to a new report from the Government of Japan which "summarizes the events and highlights the progress related to recovery operations at the Fukushima Daiichi Nuclear Power Station."...

(Following up from the previous post) 2-1-2 Draft Scenarios, etc. proposed by the Accident Analysis Committee (Attachment 4-3 and Attachment 5) The investigation team is proceeding with consideration of the following three basic questions. (1) Why does the molten core not seem to spread...

A new NRA meeting was held on Jan 13, 2023 to discuss the materials listed here (in Japanese). I opened this document, which is a general review of what is known about the nuclear accident until now. I will post below the translation of a portion of this document, starting with the page numbered...