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Japan Earthquake: nuclear plants Fukushima part 2
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[QUOTE="Sotan, post: 6637236, member: 497173"] (not sure how to quote only part of the post above) [I]P.S. Would be very helpful if we had a map of the rover location during that video. At certain parts the amount of visual artifacts and grain caused by radiation is off the charts[/I] Maybe this information will help a little: - There are some still camera shots on [URL='https://photo.tepco.co.jp/date/2022/202205-j/220523-01j.html']this page[/URL] . They might help figure out how things look in various areas. The descriptions and photos can be identified easily based on time stamps: Pedestal opening, bottom, left side (21:19:25) / Pedestal opening, bottom, right side (21:19:37) Pedestal opening, bottom, right side, area above the deposit (22:04:54) / Pedestal opening, left side, are above and below the deposit (22:04:57) Pedestal opening, bottom, right side, area under the deposit / Pedestal opening, inside, in front, looking down (22:10:37) Pedestal opening, inside, in front (1) (21:21:47) / Pedestal opening, inside, in front (1) (21:20:24) Jet deflector D, looking down (11:43:50) / Jet deflector C, looking down (15:50:47) Jet deflector D, back side (13:48:22) - If you play [URL='https://www.tepco.co.jp/library/movie/detail-j.html?catid=107299&video_uuid=og07od6u']this movie[/URL] from the same page linked above, you have these explanation at the bottom at these times (there are 4 cameras, of which the main one, looking forward ("front") is the one providing the image at bottom right. The others are labeled "side/under" - this is the one at top left; "front (in air)", top right; and "rear" (bottom left). 00:21 Jet deflector F, looking down (or: seen from above) 00:28 Jet deflector E, looking down 00:40 Deposit on the floor of the containment vessel 00:56 Vicinity of the "machinery drain sump pump" (? installed in the dry well?) 01:06 Pedestal basis/bottom/foundation area 01:28 Front side of jet deflector E 01:41 Back side of jet deflector E 01:50 Reactor recirculation system (A) pipes 01:57 In front of the opening of the pedestal 02:07 Pedestal basis/bottom/foundation area 02:19 Jet deflector E area 02:34 Jet deflector D, looking down 02:45 Back side of jet deflector D 02:56 Jet deflector C, looking down 03:07 Pedestal basis/bottom/foundation area 03:17 Area inside pedestal, at front, (probably) seen through the opening 03:34 Pedestal opening, basis/bottom/foundation area 03:46 Pedestal opening, basis/bottom/foundation area and inside/at the front - I may have not used the correct terms every time. I don't know what the jet deflectors are. - Looking at the screen, sometimes the cameras seem to witness different amounts of radiation artefacts. Maybe they are different cameras or maybe the direction they are pointing at matters. - On the same page linked at the top of this message there is also a link to [URL='http://tepco.co.jp/decommission/information/newsrelease/reference/pdf/2022/1h/rf_20220523_1.pdf']this document[/URL]. Below is a translation of the summary (google translate and a little checking). There is more information in the document, I don't have time right now to translate it all, but if anyone is interesting in something in there, let me know. It explains in more detail and using a map the location of various photos. The "Pedestal opening" which is examined in detail is depicted on the maps by a red line square and the red letters "[COLOR=rgb(184, 49, 47)]ペデスタル開口部[/COLOR]". Fukushima Daiichi Power Station Unit 1 Containment vessel internal survey Completion of detailed visual survey of the outer periphery of the pedestal by ROV-A2 <Reference Material> A PCV internal survey was conducted with the aim of examining the recovery process and equipment for recovery of deposits in the containment vessel (hereinafter referred to as PCV). In the survey, a remote-controlled robot (hereinafter referred to as “water ROV”) developed for this purpose was used to carry out “detailed visual survey inside and outside the pedestal * 1” and “sediment thickness measurement” in sequence. We are planning to get information such as quantity and origin of the sediment. Prior to these surveys, ROV-A installed a "guide ring * 2" inside the PCV from August 8 to October. The “Detailed visual survey of the outer periphery of the pedestal” using the ROV-A2 was conducted from March 14th, and resumed from May 17th after a temporary suspension of the survey. On May 17th and 18th, we checked the condition of existing structures and the spread of sediments near the pedestal foundation and near the jet deflector * 3 (E) (slide 3 frame). On May 19th, near the pedestal opening and near the jet deflectors (C, D) (slide 3 green frame), the state of existing structures and sediments was investigated. We confirmed the spread situation. (Refer to slides 4 to 7 for details.) On May 20, 21st, neutral bundle measurement was performed near the pedestal opening and near the jet deflector (E, F, H) (slide 3 small frame). We are currently conducting analysis and evaluation of the obtained data, and will inform you of the results of neutral bundle measurement after the analysis and evaluation are completed. The lifting of ROV-A2 during the day started from 11:00 am on May 23, and was completed at 3:23 pm. This completes a detailed visual survey of the outer periphery of the pedestal. After the resumption of the survey on May 17, no significant change in the PCV position and water turbidity was confirmed, and there was no impact on the survey. In addition, no defects were found in the camera image mounted on the ROVA2 during the water. We will evaluate the situation confirmed in the detailed visual survey in the future, and if necessary, we will carry out the survey in the mid-season ROV-A2, B, C, D, E scheduled to be carried out in the future. In addition, the results obtained by neutral bundle measurement will be utilized in the future to narrow down the survey range of "sediment debris detection (nuclide analysis / neutral bundle measurement)" by ROV-D. In the investigation, the work was carried out after constructing a boundary * 4 so that the gas in the PCV would not leak to the outside, and no significant change was confirmed in the data of the monitoring post and dust monitor, and the plant parameters. No radiation effects on the surrounding environment have occurred. We will continue to carefully investigate, safety as our top priority. [/QUOTE]
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