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Fukushima Trench Freezing Failures & Tactics Technical Report

Fukushima Trench Freezing Failures & Tactics Technical Report

Update: Added table of sea water data at the end and another TEPCO handout on the work released this week. TEPCO admitted a few weeks ago to METI that the trench freezing operation underway for units 2 and 3 was not working. TEPCO initially provided few details but did give a detailed report to METI. Today TEPCO released some ideas for how they intend to overcome the problems but didn’t make the details of the problems … Read entire article »

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New Robot Torus Room Inspections Under Preparation In Fukushima Unit 2

New Robot Torus Room Inspections Under Preparation In Fukushima Unit 2

Two newer underwater robots are being used to inspect the torus rooms of units 1 and 2. The robots built by Hitachi/GE are dropped into the torus room in the basement of the reactor buildings through holes cut in the first floor of the buildings. Slightly different locations for the drop hole were used in the two reactor buildings, possibly due to local radiation levels or differences in building design. The swimming robot is equipped with … Read entire article »

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Fukushima Unit 2; 5th Floor Work Progresses.. Sort of.

Fukushima Unit 2; 5th Floor Work Progresses.. Sort of.

TEPCO released some images and information about the work progress on the 5th floor refueling floor of unit 2. This is where the Warrior robot became stranded and had to be abandoned after they were unable to restart it. They have managed to cut down one of the reactor well fences using the Warrior robot. The second fence further across the refueling floor is where Warrior failed. It appears to have hung itself up while cutting … Read entire article »

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Unit 2 Frozen Trench Installation Begins At Fukushima Daiichi

Unit 2 Frozen Trench Installation Begins At Fukushima Daiichi

Work has begun to freeze the unit 2 trench at Fukushima Daiichi. This has been a problematic area since the initial disaster. In early 2011 the trench was found to be leaking highly radioactive water. The effort to freeze the trench is hoped to help block water flow so the trench can be emptied. The existing highly radioactive water will eventually be pumped into the system of storage and water treatment tanks. http://www.tepco.co.jp/nu/fukushima-np/handouts/2014/images/handouts_140328_08-j.pdf This article would not … Read entire article »

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Fukushima Unit 2; Warrior Robot Stranded On Refueling Floor

Fukushima Unit 2; Warrior Robot Stranded On Refueling Floor

The Warrior robot tipped over and remains stranded on the unit 2 refueling floor. The robot was inserted through the now covered blow out panel in the side wall to conduct inspection work towards repair work for the building. The robot depends on a power cable tether to keep it charged. The batteries had discharged and it requires someone to flip a switch on the robot in order to restart it. Due to the high radiation … Read entire article »

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TEPCO Completes Repair Work To Fukushima Unit 1-2 Vent Tower

TEPCO Completes Repair Work To Fukushima Unit 1-2 Vent Tower

TEPCO mentioned, buried in a daily report, that they have been doing work on the unit 1-2 exhaust stack. This is the venting tower that has deadly high radiation at the base and was found to have structural damage in 2013. No further details were mentioned about the work or how it was done.   Machine translation of the statement from TEPCO From the fact that the 24th March, the work of protective measures, such as for falling … Read entire article »

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Fukushima 3rd Anniversary; Technical Report Unit 2

Fukushima 3rd Anniversary; Technical Report Unit 2

These events and new information were found on unit 2 within the last year. TEPCO announced in July that they think there may be leaks in the torus structures of units 1-3. At this point they didn’t identify a specific location on the unit 2 torus as the point of failure. In April 2013 TEPCO sent in robots to inspect the MSIV room of unit 2. This room contains the large valves that open and close … Read entire article »

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Fukushima Unit 2 Loses Reactor Thermometer

Fukushima Unit 2 Loses Reactor Thermometer

Unit 2 at Fukushima Daiichi has lost another bottom thermometer in the reactor vessel. Workers said it short circuited when they were testing it. This leaves one thermometer remaining to estimate temperature in the bottom of the reactor vessel. Accurate temperatures inside unit 2 have been an ongoing problem. UPDATE: TEPCO reports workers short circuited the thermometer when they put the wrong voltage through it. This article would not be possible without the extensive efforts of the SimplyInfo … Read entire article »

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Fukushima Unit 2 Torus Has A Hole In It

Fukushima Unit 2 Torus Has A Hole In It

Kyodo is reporting a 3cm hole in the unit 2 torus. TEPCO claims that water is leaking out through this hole yet the level of water outside the torus tube is higher than the water inside the torus tube based on a recent survey. So far TEPCO has not released a report or video of the new inspection and finding. http://english.kyodonews.jp/news/2014/01/268837.html   This article would not be possible without the extensive efforts of the SimplyInfo research team Join the … Read entire article »

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Fukushima Unit 2 Fuel Removal Exploration Begins Next Week

Fukushima Unit 2 Fuel Removal Exploration Begins Next Week

TEPCO announced they will begin work to explore the best method to remove spent fuel from unit 2. Since the radiation levels on the refueling floor are so high that workers can not enter they have devised an interesting method to work in the unit. Robots will be sent into the building using the blow out panel access on the 5th floor. Periscope type cameras will be inserted through the roof to allow workers to see … Read entire article »

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Fukushima Unit 2 Torus Ultrasound Finds Internal Water Level

Fukushima Unit 2 Torus Ultrasound Finds Internal Water Level

The ultrasound robot has been run inside unit 2 to attempt to determine the water level for the torus tube. It found that the torus does contain water and it sits just slightly below the water level of the torus room. The levels are 10-30mm below the room water level. Readings were taken over 3 consecutive days. The level indicates that water either does not flow into the torus or the torus tube is no … Read entire article »

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Torus Ultrasound Inspection Being Done On Unit 2

Torus Ultrasound Inspection Being Done On Unit 2

TEPCO has done test runs with the ultrasound robot intended to detect the water level inside the torus tubes at Fukushima Daiichi. Tests done at unit 5 and unit 4 gave some information about the best way to obtain readings. They did run into issues in unit 4 where there was a thin layer of oil on the water. This caused issues for the sensor and camera. The solution proposed was to use a small … Read entire article »

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Updated Fukushima Decommissioning Schedule

Updated Fukushima Decommissioning Schedule

NHK put out this updated decommissioning schedule for Fukushima Daiichi. It gives an idea how long they assume the project will take as of now. It also shows how work at each unit is being prioritized. Spent Fuel Removal: Unit 4: Underway 2013, assumed to be completed 2014 Unit 3: 2015 Unit 2: 2017 Unit 1: 2017 Reactor Fuel Debris Removal: Unit 4: No reactor fuel Unit 3: 2021 Unit 2: 2020 Unit 1: 2020 Via: NHK Unit 1 Decommissioning Diagram (TEPCO) Unit 2 Decommissioning Diagram (TEPCO)   This article … Read entire article »

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Fukushima Daiichi Unit 2 Containment Pressure Drops Again

Fukushima Daiichi Unit 2 Containment Pressure Drops Again

Containment pressure at unit 2 has dropped again. The unit saw a significant pressure drop in August. TEPCO closed a valve and the levels partially recovered. No explanation has been given for the new drops in pressure but they appear to be becoming harder to recover from. The most current pressure was 5.04kPa g, down from an average of around 15 kPa g in previous weeks before the problem started. Why the pressure is falling repeatedly … Read entire article »

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Unit 2 Containment Pressure Drops In Half

Unit 2 containment pressure dropped by about half yesterday. TEPCO cites closing a valve allowed the pressure to slightly regain inside containment. TEPCO does not explain clearly why the valve was open and if it was intended to be that way. They state that none of the monitoring posts increased. TEPCO’s cited changes in pressure: <Changes in Unit 2 reactor containment pressure> 00 minutes 11:00 pm, the 23rd August: = 13.19Kpa g 40 minutes 11:00 am, the 24th August (valve closed after operation) =  6.62Kpa g: 3:00 pm:the 24th-August  = 7.18Kpa g <Changes in the flow rate of the Unit 2 reactor containment vessel gas management system> 00 minutes 11:00 pm, the 23rd August: = 16.03Nm3 / h 40 min 11:00 am, the 24th August (valve closed after the operation): = 12.66Nm3 / h 00 min 3:00 pm the … Read entire article »

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TEPCO Hides Reactor 2 Radiation Data, 11 Days & Counting

TEPCO Hides Reactor 2 Radiation Data, 11 Days & Counting

TEPCO did inspection work on unit 2 on August 12th, in the midst of the discovery of widespread groundwater leaks at the plant. They reported on August 12th that the took two radiation readings near the pedestal of unit 2 and labeled they “evaluating”. A follow up inspection task was reported on August 14th. No radiation readings for the containment area or worker exposure doses were reported on either report. Air dose rates do not require … Read entire article »

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TEPCO Withholds Radiation Data For Unit 2

7 days ago TEPCO took radiation readings along with temperature readings inside unit 2. This was part of an effort to try to look inside the reactor vessel pedestal. The radiation readings were marked as “evaluating” and not given. They have since done a second effort to look in the containment structure and released a video of the work. These critical radiation readings have not been disclosed and no reason given for such a delay. These radiation readings could indicate important information about the condition of the melted fuel and its location. This is unusual compared to other efforts to scope unit 2 or unit 1 where radiation readings were given along with the other data. Why TEPCO chooses now to not publicly disclose critical information not only raises concerns about … Read entire article »

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Amazing New Images Inside Unit 2 Containment

TEPCO finally released the video of the pedestal inspection of unit 2. This showed more than the initial images given to the press. As they moved the camera scope closer to the pedestal down the control rod rail the condition became more black and charred. It also appeared as if the rail no longer connected to the pedestal and may be moved to one side. As they approached the opening in the pedestal for the rail they had to view sideways to locate the opening. These images inside unit 2 show a contrast to those from unit 1 where much of the containment structure had a charred appearance. The new imagery out of unit 2 shows a charred appearance near the pedestal and possible damage to the control rod rail. We have … Read entire article »

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Unit 2 Pedestal Opening Shows Damage; First Image

The image above is the first glimpse of the right side of the pedestal opening for the CRD drive. This is a location higher up in the pedestal that the reactor vessel sits on top of. TEPCO has been trying to inspect inside the pedestal to better understand the extent of the meltdown and damage inside the reactor containment. Inspections of the torus and torus room showed fairly normal radiation and damage levels leading to concerns the reactor may have experienced a different type of meltdown compared to unit 1. The location and orientation of the CRD pedestal opening can be seen in the diagram below. One discovery in the image of the pedestal opening that is of interest is the dark splatter like substance circled in the image above. This … Read entire article »

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TEPCO; More Leaking Contamination, TIPS Exploration & Debris Analysis

TEPCO announced a number of new leaks over the weekend. Tritium levels were going up including in the port. TEPCO also announced they began a plan in April to add another metal sea wall in front of the first one to try to stem the leaking. TEPCO sent workers into unit 2 again to do more investigative work in the TIPS room. The original hope was to find an open TIPS probe pipe to send sensors and a camera into the pedestal below the reactor vessel. Earlier attempts found blockage in the pipes. This attempt again found blockage but brought out a sample of a dark grey substance. TEPCO cites the radiation level of the small bit of debris to be 200 mSv/hour but this is only y-rays and beta radiation. … Read entire article »

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Rats Vs. TEPCO, The Rats Are Winning

TEPCO’s new arch nemesis, the influx of rats that have taken up residence at the plant, are causing more problems. Two rats were found dead inside the electrical equipment being used to power unit 2′s spent fuel pool cooling system. This time it didn’t knock out power to the system but did require the cooling system be shut down for most of a day to work on the electrical box. TEPCO cleaned out the box and applied some sort of putty or foam around the entry point of the wires. Unless this material has steel wool or something similar in it to deter rats or mice from chewing, it may not be an effective solution. The IAEA recently inspected the plant, declared nothing of substance and suggested TEPCO continue to handle the disaster … Read entire article »

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MSIV Inspection At Unit 2

TEPCO did a robot inspection of the MSIV room of unit 2. No video of the work has been released but a handout and some photos were given to the press. What is most notable about this inspection is the absolute lack of visible damage. There appears to be no damage, or heat or water degradation. The radiation levels are unusually low. The highest reading in this room being 9.6 mSv/h. This inspection at least rules out the area and this section of the related pipes as being heavily involved in the reactor failure and meltdown. MSIVinspectionu2_handouts_130416_06-e This article would not be possible without the extensive efforts of the SimplyInfo research team Join the conversation at chat.simplyinfo.org All content is copyright SimplyInfo.org. Content cited, quoted etc. from other sources … Read entire article »

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Unit 2 Final Investigation Of Torus

TEPCO has completed the last portion of the investigation of the torus and downcomer pipes in unit 2. The walking robot and the tethered mini robot were able to complete repeated trips into the torus. No significant visible damage was found in the areas they could inspect. TEPCO cited some areas on the south side of the torus where there was some evidence of possible water leakage in the past but no current flow of water.   The red arrows show the downcomer pipes TEPCO saw evidence of possible past water leakage.  TEPCO assumes area 1 or 2 may have leaked in the past. They currently do not have a way to view closer up into the area. The work at least confirms there is no current large volume leak. TEPCO handout U2_torus_finalinspection_handouts_130315_01-e   This article would not … Read entire article »

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Unit 2 Torus Inspection March 13, 2013

TEPCO inspected another section of the torus of unit 2 today. It appears TEPCO intends to eventually inspect the entire torus. The inspections have focused on the downcomer vents, bellows joints and sand pocket drains looking for signs of damage or water leakage. So far there has not been any considerable leakage found. The tops of some of the downcomer vents showed what looked like small amounts of water drips on the top side. This may be from condensation or smaller water leaks but so far TEPCO has not found a “smoking gun” leak in the torus. This does not rule out a leak on the under side of the torus tube. Radiation levels in the torus room have been quite low by comparison making the idea of a failure … Read entire article »

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New Torus Inspection At Unit 2

TEPCO sent the unnamed walker bot back into unit 2′s torus room for another inspection effort. This trip looked at a torus downcomer vents and the bellows joint on that vent. The downcomer vents inspected include the east side of the building and the south east corner of the reactor building. The south east vent is assumed to be the one facing the pedestal door inside containment. This was followed by an additional inspection March 6th. They have now inspected half of the torus downcomer vent tubes. This south east tube is significant as the pedestal door is the known likely route for corium (melted fuel) to spread out on to the drywell floor inside containment. The grouping of tubes inspected on the east side of the reactor building represents the group … Read entire article »

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TIPS Probes To Unit 2 Reactor Blocked

TEPCO has been trying to insert a new thermometer into the unit 2 reactor vessel by way of the TIPS lines. These are probe lines used to insert sensors into the reactor vessel during operation. In recent work they found that the lines were all blocked. The blockages could be melted metal, fuel or salt build up from the sea water injection. Whatever the blockage is prevents going further with a probe or camera. TEPCO stated they will be reexamining what to do next. TIPSprobe_handouts_130301_04-j This article would not be possible without the extensive efforts of the SimplyInfo research team Join the conversation at chat.simplyinfo.org All content is copyright SimplyInfo.org. Content cited, quoted etc. from other sources is under the respective rights of that content owner. If you are viewing this page on any website … Read entire article »

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New Paper: Gamma Radiation Damage To Fukushima Units 1- 4 Spent Fuel Pools

fukuleaks.org/web has released another new paper taking an in depth look into the ongoing challenges at the Fukushima Daiichi nuclear plant. This new work investigates the technical issues involved with the ongoing degradation of the spent fuel pools. Gamma radiation is an ongoing problem for the steel and concrete that composes the spent fuel pools. Aspects of the disaster have drastically changed that damage mechansim. The paper can be found online and also in PDF format for download or reading on book readers. Gamma Radiation Damage To Fukushima Units 1- 4 Spent Fuel Pools http://www.fukuleaks.org/web/?page_id=9353 This article would not be possible without the extensive efforts of the SimplyInfo research team Join the conversation at chat.simplyinfo.org All content is copyright SimplyInfo.org. Content cited, quoted etc. from other sources is under the respective rights of that content … Read entire article »

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TEPCO Inspects Unit 2 Torus With Walking Robot

TEPCO did inspection work at Unit 2 in the torus with the Toshiba walker-bot (it doesn’t have a name apparently) and it’s little buddy robot. The work involved inspecting the torus downcomer vent pipes. TEPCO specifically looked at the torus bellows joint, an area we have previously identified as a potential problem location within the reactors. They also inspected the sand cushion drain pipe. This is a small pipe that sits below the junction of the containment structure and the torus downcomer pipes. This is another area thought to be a weak point and prone to burn through by melted fuel. TEPCO’s inspection of one downcomer did not show any damage to that specific structure but that may not have been the complete point of the effort. This is the first successful … Read entire article »

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Fire At Daiichi Near Unit 1 & 2 Switching Station

Last night Yushi (@Yuushi420) reported fire trucks headed somewhere through Okuma and Tomioka. “bus home from 1F. I passed quite a while driving a fire truck, siren rang through Tomioka from Okuma. I wonder also happened in a fire in the warning area … also.” (machine translated tweet) TEPCO reported today there was a fire near the high pressure switching station for units 1 & 2.  It burned about a 20 meter by 20 meter section of grass outdoors. TEPCO claims the fire did not raise radiation levels at the plant via the plant monitoring posts. TEPCO handout in Japanese: http://www.tepco.co.jp/nu/fukushima-np/images/handouts_121019_04-j.pdf   Location of the fire This article would not be possible without the extensive efforts of the SimplyInfo research team Join the conversation at chat.simplyinfo.org All content is copyright SimplyInfo.org. Content cited, quoted etc. from other sources is under … Read entire article »

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Unit 2 At Fukushima Spewing 8 Million Bq Per Hour Almost 1.5 Years Later

TEPCO has admitted the current radiation release levels at the Fukushima Daiichi plant. While these levels are a small fraction of what was being released early on, they still pose a considerable problem. The plant is emitting 10 million bq per hour. With 8 of the 10 bq coming from unit 2 alone. TEPCO officials tried to pass off the high levels as possibly due to “stirring up cesium” that fell on the reactors. This does not explain the high levels coming out of unit 2′s blow out panel as admitted by TEPCO. The image below is from a June 2012 robot inspection of the unit 2 refueling floor. The close up from a larger photo shows clearly the steam plume coming out of the edge of the reactor well. … Read entire article »

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140 New Enhanced Images Inside Fukushima Unit 2 Torus Inspection

We have about 140 images from the video investigation of unit 2 on April 18 using the Topy robot. The images include enhanced view with all the robot data plus larger enhanced versions of the actual photo window portion. These may be some of the best quality and detailed images from inside the reactors to date. We are still reviewing these images to determine all that they mean towards the situation at unit 2. Due to the large number of images we have them in a slideshow at our new group Flickr account for easier viewing. opens in a new window. *As always please leave water marks in place if you reuse our images. A link back would be great too.   This article would not be possible without the extensive efforts of … Read entire article »

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Unit 2 Robot Investigation Of Torus

TEPCO has released two photos and no other details of the robot investigation into the torus room (suppression chamber) area of unit 2. The two images are of man hole covers on top of the torus. This press release is unusual for the utter lack of any details, other photos or even a mention of forthcoming video. We are also investigating some discrepancies found in the limited information released and should have some follow up information soon. TEPCO press release This article would not be possible without the extensive efforts of the SimplyInfo research team Join the conversation at chat.simplyinfo.org All content is copyright SimplyInfo.org. Content cited, quoted etc. from other sources is under the respective rights of that content owner. If you are viewing this page on any website other than www.simplyinfo.org (or www.fukuleaks.org) it … Read entire article »

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TEPCO To Send Robot Into Unit 2 Suppression Pool Wednesday

Tepco has stated they will send a robot into the suppression pool area of unit 2 to check for damage. This would be the suppression chamber, or the area that houses the torus in the basement of the reactor. The robot to be used was made by Topy Industries and is capable of going up and down stairs. This may be a new robot to the existing line up of units being used on site. TEPCO has released this document detailing the route and the robot being used.  The location of the survey is the area where the suppression chamber faces the turbine building, a possibly weaker portion of the chamber walls. This article would not be possible without the extensive efforts of the SimplyInfo research team Join the conversation at chat.simplyinfo.org All content … Read entire article »

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Our Unit 2 Rough Estimation Of Radiation Levels In Containment

These estimations are very rough calculations. They give an idea about how high the radiation in the pedestal below the reactor could be. These numbers are very rough and not normally something we post on the website. They are worth sharing to give people an idea how incredibly high the radiation inside containment is. We took the radiation sampling TEPCO did during their March 27 scope of unit 2. From there we extrapolated some distance based assumptions to guess at the increases in radiation. The concrete pedestal is about 2 meters of thick concrete. That provides quite a bit of shielding for whatever may be inside the pedestal one year later. Used the inverse square law for calculating the dose as you go closer “halving” factor for concrete is 2.4 inches TEPCO cited 72.9 … Read entire article »

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Unit 2 Scope Results; What We Found

The second unit 2 scope project has been completed. TEPCO has released this PDF report on the project. Now in English here. Water was found 60cm above the concrete floor of the primary containment vessel. This indicates water is likely flowing out through the torus vent tubes. The elevation drawing shows where the 60cm of water would be located and it falls just at the lip of the vent tubes. It also shows that water is not staying in the torus as no water has built up and backed up into the main containment vessel. Water is leaving the torus. Water has to also be leaving the torus basement, aka: suppression chamber basement. Radiation is increased lower and towards the middle of containment hinting at some fuel involvement in the pedestal or below the pedestal. Previous years … Read entire article »

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PEER REVIEW: Unit 2 New Scope Inspection – Data Sets

The second unit 2 scope project has been completed. TEPCO has released this PDF report on the project. Now in English here. Water was found 60cm above the concrete floor of the primary containment vessel. This indicates water is likely flowing out through the torus vent tubes. The elevation drawing shows where the 60cm of water would be located and it falls just at the lip of the vent tubes. It also shows that water is not staying in the torus as no water has built up and backed up into the main containment vessel. Water is leaving the torus. Water has to also be leaving the torus basement, aka: suppression chamber basement. Other data we have is to try to determine the status of unit 2 is reactor data for the first year of … Read entire article »

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Unit 2 New Robot Inspection Findings

Workers sent a robot into unit 2 on the ground floor again. This time it went into the TIPS room. The radiation levels appear to be down compared to the previous inspection. The photos released of the TIPS room appear to be in good condition with the exception of one horizontal crack found in a corner where a wall meets the containment bulb. The crack has obvious rusty discoloration we have seen in other cracks found inside unit 2. Like these from the attempt to check the torus room. The crack in the new images is not clear as to the origin or severity but it appears to have the same tell tale rust marks the other cracks do hinting at some sort of leakage. The crack runs the length of … Read entire article »

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Unit 2 Torus Inspection Video: Images And Analysis

Video was also released of the unit 2 torus inspection. The video quality is quite poor compared to the video of 3 but there are a few usable images. Images are from the second location they inspected, quality on the first half of the video was to poor to use. Unit 2 video on YouTube - click on an image for a larger version.   Down stairs to the MB (mezzanine basement) Down stairs to MB Taking a radiation reading in the MB Radiation reading in the MB Metal plates on the floor before the airlock door. Airlock door Finding a bag on the floor in the MB Carried the bag out of the MB when they left. Inspecting the bag on the MB as they found it on their way in. The bag appears to be full of demons, or more likely some … Read entire article »

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Workers Enter Units 2 & 3 Basements; Enhanced Images & Analysis

Workers entered units 2 & 3 around noon JST. Entry to unit 2 was about 20 minutes. Entry to unit 3 about 8 minutes. Workers were wearing yellow protective suits that may have been lead lined suits seen on a few other occasions. This TEPCO document outlines the location of each image and provides radiation readings. Workers did not attempt to measure inside the torus room of unit 3. Readings outside the door were as high as 75 mSv compared to a high of 35 mSv outside torus room doors at 2. Some things of note. Unit 3′s torus room door is bowed out. There are considerable rusty looking streaks out of concrete seams in unit 2. An air handling vent in the basement of unit 2 appears to have been pushed … Read entire article »

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TEPCO Sending Workers Into Units 2 & 3 Basements In A Few Hours

TEPCO intends to send workers into the sub basement of units 2 and 3 on March 14th (a few hours from now) to inspect the torus area. The work will consist of checking for radiation levels, temperature, humidity, water levels etc. and possibly opening the door into the torus room. TEPCO thinks workers will receive a dose of 10 mSv each for the trip. This work could be both risky and significant since there is some speculation that corium or at least very highly radioactive water may reside in the torus. Unit 3 currently shows as .2 sV/h torus radiation Unit 2 currently shows at 16 sV/h torus radiation at the “B” sensor. TEPCO has this flagged as failed. If this reading is accurate that is a very dangerous level of radiation. Sievert to … Read entire article »

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