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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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Unit 1 Torus Investigation Nov 2013; Initial Findings

Unit 1 Torus Investigation Nov 2013; Initial Findings

TEPCO has done an inspection of Unit 1′s torus room, this time with a floating robot boat. TEPCO released most of the first day findings for downcomers 1-4. On the second day around the other side they only released data for downcomers 5-6. Data for anything past downcomer 6 back around to downcomer 4 is not given in TEPCO’s reporting and is not in any of the videos. The area that has not been disclosed … Read entire article »

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17.8% Of Unit 1 Spent Fuel Damaged Before Fukushima Disaster

17.8% Of Unit 1 Spent Fuel Damaged Before Fukushima Disaster

TEPCO is now admitting the number of damaged spent fuel rods in some of their reactors at the Daiichi plant. There is a total of 80 heavily damaged fuel assemblies from before the disaster, 70 of them are in unit 1′s spent fuel pool. Workers have not been able to inspect this fuel pool due to debris and damage to the building. Ex-SKF translates from a local Fukushima newspaper that TEPCO has admitted these damaged assemblies. … 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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Unit 1 Leaks Found; We Have The Details

Unit 1 Leaks Found; We Have The Details

TEPCO has investigated the torus room of unit 1 with the new boat robot. This was an effort to look closely at the downcomer  pipes that run to the torus and the related structures. They did find leaks at two locations on the first half of the investigation. One is a leak that appears to be near the ceiling and at other locations around downcomer 4 and a broken and leaking sand pocket drain pipe … Read entire article »

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Unit 1′s Groundwater Leak & Starting The Frozen Wall Begins Soon

Unit 1′s Groundwater Leak & Starting The Frozen Wall Begins Soon

TEPCO released information about at least one of the groundwater leaks. This one into the unit 1 turbine building basement. TEPCO has known about this leak since at least May of 2011. There was an effort then to dump concrete into the area to slow water intrusion. This was not disclosed to the public until now. So TEPCO has known more about the water problems all along than they have let on. TEPCO now says … Read entire article »

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Cesium Leak At Fukushima Higher Than March 2011

TEPCO has discovered a cesium level in a tunnel near the unit 1 reactor building. The recent reading is 11,600 bq/l and the reading taken in March 2011 was 1,490 bq/l. TEPCO blames it on rainwater in the tunnel but doesn’t explain how rainwater would have caused the readings to soar outside the reactor building. The sampling also had high levels of chloride. The 19,500 ppm of chloride is just slightly higher than the levels in seawater. TEPCO has been using the rainwater excuse for everything from the reactor well leak at unit 3 to the now rising holding ponds. TEPCO is working to install steel pipes near the port to pump out water. It is not clear if this will do anything substantial to solve the increasing water problems or … Read entire article »

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New Fukushima Admissions Buried In TEPCO Reporting

TEPCO’s reporting as of late has made knowing what is going on a serious challenge. They still release rather important information, it is just hard to find and rarely makes the major papers. This is one such major revelation and admission about unit 1. TEPCO mentions in the roadmap information released only in Japanese around the end of May that they intend to fill the torus room of unit 1 with grout like cement. Apparently absent from this plan is any process to deal with or further confirm the location of the melted fuel in the torus room. Radiation readings found at floor penetrations on the first floor into the torus room have extremely high radiation readings and areas of melted fuel have been found in inspection locations around the torus … Read entire article »

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TEPCO To Remove Cover On Unit 1 This Fall

TEPCO will remove the cover on unit 1 at Fukushima Daiichi this fall. The cover was hastily put over the unit in 2011 in an attempt to lower releases. TEPCO did not say why this work has suddenly been jumped ahead of other work. Most of the roadmap plans TEPCO has announced put unit 1 far down the list of priorities. To remove the spent fuel TEPCO will need to remove the cover, something they say will raise radiation levels. They will also need to remove the remains of the roof and the two cranes to do the work. It was not mentioned how much the radiation levels would rise during this work. Meanwhile the Japanese government has been pushing to reclassify more and more areas near the plant as being … Read entire article »

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Unit 1 Access Hatch Inspection Gives Clues

TEPCO sent a pair of robots in to inspect the personnel access hatch for unit 1 recently. Upon reviewing the video we found a few things of significance. TEPCO obviously had some motivation for checking this room. A large diameter steam pipe runs through the adjacent room and goes through the thick concrete containment wall. The pipe is a steam line for the HPCI system. The radiation levels near the pipe jump to a range of 120-155 mSv/h and water can be seen on the floor. Salt staining is also evident below the pipe leading to a floor drain. This drain could be part of a controlled liquids system meaning that water running to the drain may be captured by radioactive waste systems at the plant. The leak appears to have … Read entire article »

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Pre-Tsunami Damage At Unit 1 Fukushima Daiichi

Concerns about damage to unit 1 and possibly other units having happened before the tsunami hit the plant still exist among experts and those who witnessed the disaster. Many worked cited seeing pipes buckle, break, leak or fall off of walls as they fled the unit during the earthquake. In an effort to document these events and investigate the possibility of earthquake induced damage playing a role in the disaster we have started a page to document those findings. The permanent page can be found here or in the Fukushima Status menu on the home page. http://www.fukuleaks.org/web/?page_id=10166 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 … Read entire article »

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TEPCO Announces Plan To Look At Reactor Vessel In Unit 2

TEPCO announced a plan that should enable them to look inside unit 2 and inspect the reactor vessel directly.  TEPCO plans to use the long scope camera to conduct the work. They will send the scope down the control rod replacement rail into the pedestal, this will allow a clear view of the underside of the steel reactor vessel. Since the bottom of this vessel is the likely melt through location this work may give some major clues to what happened at unit 2. From the handout it appears they practiced the work at unit 5. This is a common tactic TEPCO has used to allow workers to be familiar with the task before going into the high radiation environment in the other units. This work will be done in late March, … Read entire article »

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Unit 1 Torus Radiation Shows Possible Source Location

TEPCO recently inspected the unit 1 torus room for a second time as we reported here. Workers involved in the inspection work made the comment that the torus tube and the proximity to the probe may play a role in the new radiation readings. The levels being found within the torus indicate that work in this region of the building could prove quite difficult and may require specialized robotic equipment. February 2013 Unit 1 torus inspection, probe (blue line) compared with torus and water proximity. We have reviewed multiple handouts issued by TEPCO concerning the inspection of the torus areas at 2 locations along the west side of the reactor building. The first being in June 2012 and the second in Februrary 2013. Each was conducted at different locations about 16900mm apart … Read entire article »

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Unit 3 Spent Fuel Pool Update

A series of videos were released recently showing sections of the spent fuel pool at unit 3 of Fukushima Daiichi. While they do not show all areas of the pool they do give some hints at the condition of the pool. These are the best quality videos to date. This may be do to attempts to clear the pool water to aid the retrieval of objects in the pool. Videos: http://www.youtube.com/watch?v=ZUmXNNjiS0E&list=UUs6GVH_Px26xPssNOjiJp8Q&index=6 http://www.youtube.com/watch?v=mHeLD9-M8Qs&list=UUs6GVH_Px26xPssNOjiJp8Q&index=5 http://www.youtube.com/watch?v=r3snw1g-Z-0&list=UUs6GVH_Px26xPssNOjiJp8Q&index=4 http://www.youtube.com/watch?v=HiCvN7Kqmh8&list=UUs6GVH_Px26xPssNOjiJp8Q&index=3 http://www.youtube.com/watch?v=hnkvcsfBA04&list=UUs6GVH_Px26xPssNOjiJp8Q&index=2 Images: We have an extensive collection of large format images based off of the new video inspections. These provide an improved visual with a high level of detail. View the entire image collection of the new unit 3 videos here on our Flickr page: http://www.flickr.com/photos/simplyinfo/sets/72157632820926995/ Findings and comments: The photo above reveals potential damage to fuel assembly lifting bails.  There is perhaps 100 tons of debris … Read entire article »

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Unit 1 Torus Inspection Review

New work done around February 21 to 22 has been posted by TEPCO and confirmed by workers. The newest work was done at a new location about 17 meters from the previous torus inspection location. (ignore the blue route lines, those are from a previous use of the floorplan diagram at another unit.) The video was considerably different than what was seen on the previous torus inspection. The newest inspection video can be found here on our Youtube channel Our work and data from the previous torus inspection back in June 2012 can be found here. We also processed the new inspection video into individual images that can be found on our Flickr page. Two TEPCO handouts from the newest torus inspection: U1_torusday2_handouts_130222_05-e U1_torusday1_handouts_130220_02-e Workers drilled a large hole into the concrete floor in the north west corner of the … Read entire article »

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Public Spin On Fukushima Coming Undone

TEPCO’s efforts to avoid outside inspections of the unit 1 reactor have caught up with them. After it was recently pointed out to the Diet that TEPCO had lied to the investigation committee last year in an effort to avoid an inspection, now it appears one is pending. The Diet has asked the new nuclear regulator to conduct an inspection of the isolation condenser system in unit 1 and they appear ready to do so: “If the condensers are found to show damage consistent with shaking in an earthquake there would be case for higher standards in nuclear plant design—with important implications for existing reactors built to lesser tolerances. But the Nuclear Regulation Authority chairman warned against premature conclusions. “We will not pre-judge the investigation,” Tanaka said. He added that an investigation … Read entire article »

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Asahi Shimbun Calls For New TEPCO Investigation

An editorial put out today by Asahi Shimbun calls for a new Diet investigation into the Fukushima Daiichi accident. Events came out this week that showed TEPCO has purposely deceived members of the Diet accident investigation committee. TEPCO lied about conditions within the unit 1 reactor in an attempt to dissuade the investigators from doing an on site inspection of the emergency cooling system at unit 1. This information regarding 1′s cooling system is critical as the investigation concluded mostly based on TEPCO’s disclosed information that the cooling systems were not damaged by the earthquake. There has long been concern that something damaged one portion of the isolation condenser system at unit 1 during the quake causing it to not work. Worker interviews in The Atlantic in 2011 disclosed that they saw … Read entire article »

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TEPCO New Video; Unit 1 Needed Venting Again Weeks After Disaster

In a new video release by TEPCO, managers discussed venting the unit 1 reactor again almost two weeks after the disaster began. Asahi Shimbun reported this exchange between Yoshida at Fukushima Daiichi and executives in Tokyo. “At 11:20 a.m. on March 23, 2011, Masao Yoshida, then chief of the Fukushima No. 1 plant, asked the Tokyo head office to confirm procedures for venting a containment vessel. “It will be an extremely major issue, and we need to coordinate with the head office,” Yoshida said. At that time, pressure at the No. 1 reactor was climbing to the maximum level the reactor was designed to withstand. The pressure did not fall until the night of March 24.” The Asahi Shimbun report does not say if the reactor was actually vented again or if … 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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What The Melted Fuel At Fukushima Unit 1 Looked Like In The Pedestal

A recent report by Sandia National Lab indicated that about 140,000kg of melted fuel and debris was released out of the unit 1 reactor vessel. These calculations were part of a larger effort to model the progression of the meltdowns at Fukushima using the known reactor data. “The present analysis shows gross failure at about 14 hours when approximately 140,000 kg of core materials was released to the drywell cavity region” We took those quantities and attempted to visualize what that bulk of melted fuel would look like compared to the pedestal region below the reactor vessel. The rough volume of fuel presented as a total amount gives a better idea how much melted fuel is being dealt with at unit 1. The height range is based on the volume and density range for … Read entire article »

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TEPCO Restarts Nitrogen Injection In Unit 1 Suppression Chamber

From today’s TEPCO report, they intend to restart nitrogen injection into the torus (suppression chamber). This has been done frequently over the last three months to combat hydrogen build up in the torus. Current containment hydrogen levels are at 0%. There has been some concern over the location of the hydrogen sensors for unit 1 containment. Based on TEPCO documents they currently read containment hydrogen is out in the venting gas handling system. (Machine Translation) “As proactive in order to check the status of hydrogen generation by water radiolysis in the 1/8 10:37 suppression chamber [No. 1], Resume the continuous inclusion of nitrogen gas into the suppression chamber.” 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 … Read entire article »

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