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Second Fukushima Unit 1 Robot Investigation Complete

Second Fukushima Unit 1 Robot Investigation Complete

TEPCO/IRID released a very small selection of video clips from the second investigation that took place over two days along with some photos and handouts. Previous work that included inserting a scope into containment estimated the water level was just below the catwalk level. Images and video from the new robot inspections hint that they may have seen a visual of that water level through the catwalk floor.   Radiation levels cited by TEPCO were low by comparison. … Read entire article »

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2nd Robot Enters Fukushima Unit 1 Containment

2nd Robot Enters Fukushima Unit 1 Containment

TEPCO is reporting that the second robot has been put into containment and made 6 of the 11 data stops on the second inspection route. This is roughly half way through the distance of the second route, noted in red on the graphic below. They plan to resume work tomorrow morning.   Rough translation of the report in TEPCO’s daily press handout.: 4 / 15 ~ you are ready this time, from collecting further information of the reactor containment … Read entire article »

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Report On Fukushima Unit 1 Containment Inspection 2015

Report On Fukushima Unit 1 Containment Inspection 2015

Hitachi’s shape changing robot (at least one of them, they have more) is abandoned and dead inside the containment of unit 1. The robot did manage to transmit quite a bit of information and was still working two days later when they cut the cord. This is a small bit of good news as it proved that the robot model could withstand fairly high radiation for a long period of time without the camera or … Read entire article »

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Fukushima Containment Robot To Be Abandoned Inside

Fukushima Containment Robot To Be Abandoned Inside

TEPCO announced that the robot stuck in containment will not be recovered. They will send a team into the reactor building today to cut the cable for the robot and leave it in containment. Entry of the second robot was postponed. TEPCO has not made the data collected by the first robot public yet. This article would not be possible without the extensive efforts of the SimplyInfo research team Join the conversation at chat.simplyinfo.org © 2011-2015 SimplyInfo.org, Fukuleaks.org … Read entire article »

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Fukushima Unit 1 Robot Still Transmitting Data

Asahi Shimbun is reporting that the robot stranded inside unit 1 containment is still transmitting data. This rules out radiation damaging the controls. From Asahi Shimbun: “According to an IRID official, the operators tugged on the robot’s cable and sent instructions for it to change shape, but it still would not move. The robot’s camera, dosimeter and temperature gauge were not damaged, and the robot was still capable of transmitting data.” They also stated that the actual travel time was between 11:20 to 2 pm. The remaining hours of the work effort was the time needed to insert the robot into containment. This article would not be possible without the extensive efforts of the SimplyInfo research team Join the conversation at chat.simplyinfo.org © 2011-2015 SimplyInfo.org, Fukuleaks.org All Rights Reserved Content cited, quoted etc. from other sources is … Read entire article »

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Fukushima Unit 1 Robot Failure, What We Know So Far

Fukushima Unit 1 Robot Failure, What We Know So Far

Per Yahoo News Japan, the robot died about 2/3 of the way through the planned route. Specifics about what kind of failure the robot had were not available yet but Kyodo News reports that workers tried to tug on the data cable but were unable to move the robot. Workers are currently working on an effort to retrieve the robot from containment. This map of the planned work, rotated to match the existing floor plan orientation … Read entire article »

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Fukushima Unit 1 Robot Dies In Containment During Inspection

Fukushima Unit 1 Robot Dies In Containment During Inspection

Kyodo News is reporting the robot died inside unit 1′s containment during the inspection. It stopped functioning part way through the inspection. TEPCO has provided no other information about this yet. This article would not be possible without the extensive efforts of the SimplyInfo research team Join the conversation at chat.simplyinfo.org © 2011-2015 SimplyInfo.org, Fukuleaks.org All Rights Reserved Content cited, quoted etc. from other sources is under the respective rights of that content owner. If you are viewing this … Read entire article »

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Fukushima Unit 1 Containment Inspection Conducted

Fukushima Unit 1 Containment Inspection Conducted

TEPCO reports that the work is underway and released three images of the robot being inserted into the containment structure. The images of the robot were taken with a scope camera and confirm the robot was inserted into containment, made it down to the catwalk and successfully rearranged itself for the inspection work. No additional information was given by TEPCO at this time but they did label the handout for the work as “preliminary” so additional … Read entire article »

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Unit 1 Basement Shows Highly Contaminated Water Remains

Unit 1 Basement Shows Highly Contaminated Water Remains

TEPCO is making an effort to lower the water level in some of the basement rooms of the unit 1 reactor buildings. As groundwater has been pumped up via the outdoor subdrain pits, this has created a situation where the standing water in the basements could end up higher than the surrounding groundwater. This could lead to more contaminated water leaking out of the buildings. TEPCO is installing more water level monitoring sensors to better … Read entire article »

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Fukushima Daiichi Unit 1 Containment Inspection Starts April 10th

Fukushima Daiichi Unit 1 Containment Inspection Starts April 10th

According to a recently released handout from TEPCO and IRID the robot inspection of unit 1′s containment should commence around April 10th with the second inspection on April 13. Scope inspections to install monitoring instruments into containment will happen roughly around the same time frame.  This 3D map of containment shows where the two robot inspection routes are planned to take place. Each numbered spot on the route is a location they plan to stop, take photos, … Read entire article »

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Muon Scan Finds No Fuel In Fukushima Unit 1 Reactor Vessel

Muon Scan Finds No Fuel In Fukushima Unit 1 Reactor Vessel

TEPCO published the results of the muon scan done by IRID and their cooperating partners. No fuel was found in the reactor vessel of unit 1 Fukushima Daiichi. The handout in Japanese can be found here A very rough English translation can be found here This was as expected by many (including us) who have been documenting the other evidence that indicated this was the likely case. The plan for the future with unit 1 is to insert … Read entire article »

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Fukushima Daiichi Discharge Canal Sees Large Contamination Increase

Fukushima Daiichi Discharge Canal Sees Large Contamination Increase

We previously reported about increases at the unit 1 discharge canal back in February. The highs back then were in the 4 digit range. More recent testing in the last week has seen much higher readings. Readings taken: 3.13.2015 Beta radiation: 110,000 bq/liter Cesium 137: 84,000 bq/liter Cesium 134: 24,000 bq/liter The highest readings in February that raised concerns were: Beta radiation: 8,200 bq/liter Cesium 137: 2,000 bq/liter Cesium 134: 580 bq/liter TEPCO has said nothing about the increases found in February and nothing … Read entire article »

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Radiation Spike At Fukushima Daiichi Discharge Canal

Radiation Spike At Fukushima Daiichi Discharge Canal

A significant spike in contaminated water levels at Fukushima Daiichi in the unit 1 discharge canal was reported today. Readings between Feb 14th and Feb 18th saw a considerable jump beyond normal fluctuations for these two locations. The only new work began between the 14th and 18th is the concreting of the unit 4 seawater piping trench. It is not clear if this had any influence on the readings or if so, why it would. Feb … Read entire article »

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Fukushima Unit 1 Containment Inspection To Begin In April

Fukushima Unit 1 Containment Inspection To Begin In April

AP is reporting that Fukushima Daiichi unit 1 will get the first of three anticipated containment inspections in early April of this year. Hitachi showed off the shape changing robot to the press this week. The robot will be used once at unit 1 then stored in a shielded box. Hitachi is expecting to use a slightly different robot for the inspection of each unit but didn’t say what those differences would be. This upcoming inspection … Read entire article »

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Muon Scans Begin At Fukushima Daiichi

Muon Scans Begin At Fukushima Daiichi

Muon scans have begun at Fukushima Daiichi for the unit 1 reactor. The set of three self contained boxes has been installed at unit 1 of Fukushima Daiichi and will run for about a month before results could be known. The project was initially conceived by scientists at Los Alamos national lab in the US. The project is currently being run by Toshiba and coordinated by IRID. After initial test runs at a research reactor facility in … Read entire article »

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Fukushima Unit 1 To Begin Muon Scan In February

Fukushima Unit 1 To Begin Muon Scan In February

Work to install the muon scanners at Fukushima Daiichi unit 1 should be underway by February 2015. A number of research projects leading up to this have been taking place. These include efforts to determine the proper amount of shielding required so the detectors can function at the plant among the high levels of radiation and test scans of a functional reactor at Tokai. With both of these projects done, the first installation is planned for … Read entire article »

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Fukushima Unit 1 New Photos Reveal Additional Damage

Fukushima Unit 1 New Photos Reveal Additional Damage

Photos taken during the removal of the cover on unit 1 showed some additional conditions on the refueling floor that had not been apparent until now. A section of the concrete reactor cover was dislodged during the events at unit 1. The other end of the cover section is not visible, this would give a better idea of how the section became dislodge. It could indicate that the events at unit 1 were worse than … Read entire article »

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Fukushima Unit 1 Reactor Well Cover Dislodged

Fukushima Unit 1 Reactor Well Cover Dislodged

TEPCO showed in a handout that got little attention that the concrete reactor well cover for unit 1 is dislodged. The concrete cover sits on top of the reactor containment cap to provide both radiation shielding and some level of blast shielding. TEPCO has admitted in the past that there is at least some leakage out the top of unit 1 but had not explicitly admitted the reactor well cover was dislodged. These covers are a … Read entire article »

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Fukushima Unit 1, 2nd Cover Section Removed

Fukushima Unit 1, 2nd Cover Section Removed

TEPCO has removed a second section of building cover from unit 1. As the first section was removed TEPCO claimed to take readings to prove no contamination was blowing away. There was no offsite dust monitoring done and no 3rd party monitoring done. TEPCO declared things “safe” and removed another cover section. This work is being done after demolition work on the unit 3 building caused a dust cloud to blow out of the plant undetected … Read entire article »

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Fukushima Unit 2 Subdrain Has Larger Problem

Fukushima Unit 2 Subdrain Has Larger Problem

In recent weeks TEPCO began reporting about high radiation readings in subdrain pits near the reactor buildings. TEPCO’s original intention was to begin using these to draw out contaminated water, treat this water and release it to the sea. The subdrain pits existed before the disaster to keep groundwater from infiltrating the reactor building basements. TEPCO noted that the subdrain pit wells in this area are inter connected. They at least hinted they think this may have caused … Read entire article »

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Fukushima Unit 1 Fuel Removal Delayed

Fukushima Unit 1 Fuel Removal Delayed

TEPCO announced they would delay the removal of both spent fuel from the pool and from the reactor vessel at unit 1, Fukushima Daiichi. What is not clear is exactly why. TEPCO cited having to remove excessive debris from the buildings. They have known the conditions inside the building and the refueling floor for a number of years. Investigations into the building and refueling floor began as early as 2011 with an in depth screening … Read entire article »

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Fukushima; Radiation Spike In Unit 1 Discharge Canal

Fukushima; Radiation Spike In Unit 1 Discharge Canal

TEPCO hasn’t released radiation readings for the set of discharge canals for well over a year. This location has been historically quite high when they sampled it before. TEPCO announced that the sampling location in the discharge canal was again quite high while a downstream location was not. They provided no explanation where they assume the highly contaminated water is migrating to. Beta radiation:  120,000 bq/liter Cesium 134:  31,000 bq/liter Cesium 137: 95,000 bq/liter TEPCO closed off the end of the discharge … Read entire article »

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Unit 1 Cover Removal Begins At Fukushima Daiichi

Unit 1 Cover Removal Begins At Fukushima Daiichi

Initial work to remove the cover off unit 1 at Fukushima Daiichi has begun. The initial work includes cutting a hole into the tent cover and spraying a fixative to try to lower dust releases. Actual removal is scheduled for next year with demolition work falling further into 2016. The unit is currently scheduled for spent fuel removal in 2017. http://www.tepco.co.jp/nu/fukushima-np/handouts/2014/images/handouts_141022_06-j.pdf    This article would not be possible without the extensive efforts of the SimplyInfo research team Join the conversation … Read entire article »

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Fukushima Unit 1 Cover Removal Delayed To Late October

Fukushima Unit 1 Cover Removal Delayed To Late October

47 News is reporting that TEPCO will delay the removal of the cover on unit 1 at Fukushima Daiichi until late October. The removal was previously scheduled for late September. It is not clear if the delay is due to additional precautions being implemented after scientists found that demolition work on unit 3 had released a considerable amount of radiation to the environment or if other events have added to the delays. http://www.47news.jp/smp/CN/201410/CN2014101001002100.html This article would not be … Read entire article »

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IRID Admits Fukushima Unit 1 Fuel May Be Outside Of Containment

IRID Admits Fukushima Unit 1 Fuel May Be Outside Of Containment

The head of IRID made this interesting admission during the fall meeting of Atomic Energy Society of Japan last week. He admitted that the melted fuel for unit 1 is outside the pedestal and could possibly be outside of containment. He cited this situation as being one of the reasons they are looking into alternative methods of fuel extraction, not just TEPCO’s initial idea of extraction through the reactor vessel. He did state that they think … Read entire article »

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New Fukushima Worker Testimony Describes Suicide Mission To Vent Unit 1

New Fukushima Worker Testimony Describes Suicide Mission To Vent Unit 1

Kyodo News is running a series of articles based on some of the official testimony of Fukushima Daiichi workers. These workers tell important details TEPCO didn’t always disclose along with their personal stories of battling the disaster. Some of the more disturbing and new revelations include efforts to vent unit 1 by workers at the plant on March 12 as the disaster began to worsen. Hideyoshi Endo, a shift supervisor was one of the workers who took … Read entire article »

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Fukushima: Unit 1 Cover Removal & Demolition Work To Begin Soon

Fukushima: Unit 1 Cover Removal & Demolition Work To Begin Soon

TEPCO has announced their plan to remove the cover of unit 1 so that debris on the refueling floor can be cleaned off. This work will enable viewing of the spent fuel pool and the condition of the reactor well. The work has come under increased scrutiny after it was discovered that similar demolition work at unit 3 had caused contamination up to 50km from the plant due to the wind blowing radioactive building dust. TEPCO’s … Read entire article »

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New Robot Inspection Of Fukushima Unit 1

New Robot Inspection Of Fukushima Unit 1

Two robots, sponsored by IRID conducted an investigation of unit 1. The areas between the 2nd and 3rd floors have radiation levels too high for humans to enter for any extended period of time. Robots Rosemary and Sakura were sent in to do a coordinated inspection.         Rosemary is equipped with a newer type of gamma camera to record radiation readings. Sakura provides additional views of the other robot and acts as a wireless … Read entire article »

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New Work At Fukushima Unit 1

New Work At Fukushima Unit 1

Inspection work inside unit 1′s torus room to check pipe penetrations into the turbine building have been completed. Clay was used as a tracer. This showed some minor leakage between the two buildings. The seals were considered to be mostly intact. Images of the area showed what looked like a silicone material over the pipe penetration. This would be a non-standard way of sealing a pipe penetration. TEPCO and IRID didn’t elaborate on the patch … Read entire article »

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New Unit 1 Findings Indicate Contamination Path

New Unit 1 Findings Indicate Contamination Path

TEPCO’s new reports on the unit 1 torus room already showed that a vacuum breaker caused an issue. Now they are admitting some issues near the venting pipe, but we found even more. The venting pipe has about 2.4 sieverts per hour near it as taken with the survey robot. Previous work found about 4 sieverts an hour in another section of that pipe on the first floor and considerable radiation coming from the vent pipe … Read entire article »

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Frozen Wall Installation Begins By Unit 1

Frozen Wall Installation Begins By Unit 1

Work has begun to install the frozen wall around the reactors at Fukushima Daiichi. The first section to be done is inland of unit 1 in the north corner. This roughly coordinates with the general area of highest contamination at the plant being downstream. Each frozen wall section is defined as a block with a total of 13 blocks. The project of installing the system is expected to take up to a year to … Read entire article »

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Fukushima Unit 1 New Torus Room Inspections

Fukushima Unit 1 New Torus Room Inspections

What are they doing? TEPCO & Hitachi are apparently looking for damage to the vacuum breaker pipes that run in tandem above the downcomers to the torus inside unit 1. The handout before they did the actual work cited both the vacuum breakers and the location they found one leaking so they may have had other data that lead them to believe this was a problem. Additional parts of the plan include using both the robots and … Read entire article »

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Fukushima Unit 3 Leak Found, Unit 1 Loses Containment Pressure Monitoring

Fukushima Unit 3 Leak Found, Unit 1 Loses Containment Pressure Monitoring

Two significant admissions were made by TEPCO at the end of the week. Unit 3 Scope work into the unit 3 MSIV room found multiple locations where steam pipes were leaking. The handout appears to show locations on the joints of the pipes before the main steam isolation valves where they found leaks. The section where these pipes go through the containment wall have rust traces as if those locations may also be leaking. These are obviously … Read entire article »

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Fukushima Unit 1 To Undergo Spent Fuel Pool Desalination

Fukushima Unit 1 To Undergo Spent Fuel Pool Desalination

TEPCO reported they will now remove the salt from the unit 1 spent fuel pool. Maybe you are asking why now, over 3 years later are they just getting around to this? We wondered the same thing. In reviewing our older notes it appears TEPCO may not have added any water to the unit 1 spent fuel pool during those early days where they were forced to use sea water for cooling at the plant, … 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; Unit 1 Technical Report

Fukushima 3rd Anniversary; Unit 1 Technical Report

With the 3rd anniversary of the 3-11 triple disaster approaching we have taken a look at the changes that have taken place at Fukushima Daiichi. Unit 1: In July TEPCO admitted that both the reactor and containment caps are leaking. TEPCO mentions it leaks nitrogen but that would permit anything else to leak out through the same path. They also admitted the downcomer expansion bellows were leaking nitrogen and steam in the torus. The upper leaks … Read entire article »

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Unit 1 Scans Find Highly Contaminated Vent Pipe

Unit 1 Scans Find Highly Contaminated Vent Pipe

Robots with sophisticated gamma scanning cameras were sent in to unit 1 to establish contaminated areas as decontamination efforts take place. One area that has been of particular concern since 2011 is a section on the 1st floor that had unusually high radiation. The same area had steam coming out of the floor in 2011 through the pipe penetration. This area is above the torus room in a section over the #8 downcomer pipe. This … Read entire article »

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TEPCO Worried About Vent Tower Stability, 25 Seivert Radiation Found At Base

TEPCO Worried About Vent Tower Stability, 25 Seivert Radiation Found At Base

TEPCO had been inspecting the unit 1/2 vent tower at a distance after damage to the upper structural system was found a few months ago. This had involved using telephoto camera lenses to view portions of the tower. This tower has been roped off since August 2011 when extremely high radiation was found near the tower. Now TEPCO has sent workers to take radiation readings around the base of the tower again. They found 25 seiverts … Read entire article »

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TEPCO Fails To Release Portion Of Unit 1 Torus Inspection

TEPCO Fails To Release Portion Of Unit 1 Torus Inspection

TEPCO recently released videos and reports of their work in the unit 1 torus room. The work was split into two days with one half being investigated one day and the remaining half the second day. TEPCO reports that this work was successfully completed. The video and handouts show day one’s work on downcomer sections 1-4. Day two covered sections 5-8 plus the assumption they would also investigate the section between downcomers 4 and 8. The … Read entire article »

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New Analysis Shows Unit 1 Meltdown More Severe Than Admitted

New Analysis Shows Unit 1 Meltdown More Severe Than Admitted

“Computer simulations show the melted fuel in Unit 1, whose core damage was the most extensive, has breached the bottom of the primary containment vessel and even partially eaten into its concrete foundation, coming within about 30 centimeters (one foot) of leaking into the ground.” This is a recent statement out of Hajimu Yamana, the president of IRID. IRID is the new authority created to come up with ways to decommission Fukushima Daiichi. In a 2011 report Lawrence … Read entire article »

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