SimplyInfo » Entries tagged with "unit 3"
Highly Radioactive Debris Found On Unit 3 Refueling Floor
[Translate] TEPCO has announced that a piece of highly radioactive debris has been pulled off of the refueling floor of unit 3. The object read 540 mSv/h and was removed by robotic equipment. So far no photos of the object or description of where on the refueling floor it was found have been provided by TEPCO. Ex-SKF has full translations of the two TEPCO statements. We have been monitoring the progress of the refueling floor debris removal. As of last week they were nearing the area over the reactor well. These photos show where they were in the clean up last week. 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 may also be copyright of other specific … Read entire article »
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Temporary Power Failure At Fukushima Daiichi, Not A Repeat From Last Week
[Translate] Unit 3 lost power to the spent fuel pool cooling system yet again. So far no cause has been admitted and the other units are reported to still have power. The power system at unit 3 was out for about 3 hours before being restored. This incident is not building public confidence after a rat took out power to the plant in recent weeks. Read more: http://ajw.asahi.com/article/0311disaster/fukushima/AJ201304050069 http://www3.nhk.or.jp/nhkworld/english/news/20130405_26.html 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 may also be copyright of other specific original authors or creators and was reproduced here with limited permission. While we welcome the sharing of information or promoting our work, please do so with respect to the large amount of effort and time that … Read entire article »
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Unit 3 Location Of Crane & Mast In Pool
[Translate] In an attempt to better understand how the crane is situated in the spent fuel pool of unit 3 we developed some illustrations. Using various TEPCO reports, diagrams and photos we were able to estimate the location of both items within the spent fuel pool. The first flat map shows the crane location in green and the mast in pink per TEPCO’s original version of the map. The red blocks are known location of fuel based on a 2010 photo of the spent fuel pool. Additional fuel may have been offloaded into the pool since the photo was taken. The second image attempts to show both items in within the pool. 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 … Read entire article »
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Analysis: Unit 3 Mast In Pool Inspection
[Translate] TEPCO released a new video and handout of the unit 3 mast that fell deeper into the spent fuel pool. We have processed the video into about 200 still images that can be found here. The full video of the inspection can be found on our Youtube channel. TEPCO estimates one end of the mast landed along the east wall with the end resting on a control rod drive rack. The other end appears to be resting tangled in concrete and rebar debris on top of the fuel racks. Portions of the middle of the mast can be seen spanning above the fuel racks by a few inches. What appears to have been the structure that originally held the mast into the fuel crane can be seen partially down the mast. What is of … Read entire article »
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Unit 3 Daiichi Pool Accident Analysis
[Translate] TEPCO announced this week that the 1.5 ton mast for the refueling crane fell into the pool and sank as they tried to remove debris from the pool. TEPCO has done some testing of radiation levels near the pool and does not think there was fuel damage based on not finding drastically elevated levels. The mast falling could create a couple of potential damage situations. It could fall and damage the fuel assemblies held in the pool. It could also damage or puncture the spent fuel pool metal liner causing a leak in the pool. The condition of the liner or the concrete pool has not been confirmed by TEPCO to date. The mast that fell looks like this under normal conditions. It has minimal connections to the refueling crane. TEPCO released these … Read entire article »
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New Paper: Gamma Radiation Damage To Fukushima Units 1- 4 Spent Fuel Pools
[Translate] SimplyInfo.org 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.simplyinfo.org/?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 may also be copyright of other specific original authors or creators and was reproduced … Read entire article »
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Atomic Rats, Fishing For Beams & Cleaning Up The Common Pool At Daiichi
[Translate] Workers at the plant are reporting seeing rats at Daiichi. Worker Happy11311 mentioned seeing them and was worried they would damage cables at the plant. They could cause obvious safety problems if they chewed on electrical or water lines. Small animals also pose the risk of getting into equipment and causing issues by tripping electrical systems. Then there is the problem of rats being in contact with high levels of radiation then making them highly contaminated. This can cause problems as they then spread the contamination up the food chain or take it with them if they leave the immediate area. TEPCO successfully pulled the steel beam that had fallen in the spent fuel pool of #3 back in October. They did a practice run and installed some safety bumpers … Read entire article »
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Robot Inspection Of Unit 3 Finds Increasing Radiation Levels, New Robot Fails.
[Translate] TEPCO reports the results of a robot inspection in unit 3 at Fukushima Daiichi. The initial work was to look at the improvised duct hose to remove gas from the reactor containment. The new robot FRIGO-MA failed to work due to a bug. TEPCO sent in Packbot and Quince instead. TEPCO did not state the nature of the inspection other than to look at the gas duct hose. It appears the concern was due to increasing radiation levels in the area. TEPCO was likely inspecting the duct as the source of the possible increase. No leaks or damage were found on the duct. What they found was that the containment door and track were the source of the increased radiation levels. Workers had a .52 mSv exposure dose for their work. Packbot … Read entire article »
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TEPCO Inspects Gas Control & Introduces A New Robot
[Translate] TEPCO announced they are sending in robots to inspect an improvised gas control duct in unit 3. They do not say why they are inspecting the “duct” that looks more like a reinforced hose. This duct was quite obviously installed by humans at some earlier date yet TEPCO never reported this specifically. Now they will send in robots because the radiation levels are too high. While this is good as far as protecting workers and using robots for mundane tasks, the exposures of the workers that installed the duct were likely quite high. The worker seen in the image is wearing a yellow protective suit seen when workers have to go into extremely high radiation areas. TEPCO also introduced a new robot. FRIGO-MA built by Mitsubishi Details on the work at unit 3 and … Read entire article »
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Oops! Worker Bumps Reactor Water Valve At Fukushima Daiichi Changing Water Rate
[Translate] A worker installing pipe insulation bumped a valve controlling the feedwater cooling for unit 3 at Fukushima Daiichi. This increased the water injection rate to 7 tons per hour from 5.8 tons per hour. Once it was discovered workers adjusted the valve back down. Such events highlight the fragile nature of the plant where critical systems have no protection or safety systems. 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 may also be copyright of other specific original authors or creators and was reproduced here with limited permission. While we welcome the sharing of information or promoting our work, please do so with respect to the large amount of effort and time that goes into our … Read entire article »
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Indecision, Handouts And Heating Up Fuel Pools
[Translate] The NRA panel of experts was supposed to decide today if the Oi nuclear plant would be allowed to continue operating or not. Instead of a decision they have decided upon more tests. TEPCO says it needs $125 billion USD to continue making compensation payments and to cover the cost of decontaminating areas covered in fallout from the leaking nuclear plant. This amount is equal to 2% of Japan’s GDP. A recent video stated these costs were only to cover possibly the next two years. Some experts said the constant need for huge sums of money to deal with the nuclear disaster would turn TEPCO into a “shell” that exists only as a vehicle to deal with the disaster. By contrast the Price Anderson Act in the US, a law that … Read entire article »
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Unit 3 Debris Accident & Pool Damage
[Translate] TEPCO began removing debris using remote control cranes last week. Reports from worker Happy11311 indicated that they didn’t have a detailed plan for removing the debris but were going to determine as they go what appeared to be safe to remove next. After the steel beam fell into the pool he reported in more detail how difficult the work at unit 3 really is. They work in a remote booth while in full radiation protection gear and respirators, he commented that the crane and camera shake adding to the difficulty. He compared it to a big game of Jenga. The Denki Shimbun reported that the twisted steel and debris on top of unit 3 are bent inward making the removal much more difficult than at unit 4 where most of the … Read entire article »
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Unit 3 SFP Inspection, Reactor Cap Removed At Unit 4
[Translate] TEPCO has been progressing on work at Fukushima Daiichi to deal with units 3 and 4. The reactor (RPV) cap was removed from the top of unit 4. It appears TEPCO has removed all of the large heavy gear that had been sitting on the top west floor of the damaged reactor building. This removal should help with building stability. This image shows the yellow containment cap, tool pit crane,all of the concrete reactor well plug and the reactor cap have been removed. More images of unit 4′s work can be found in our photo gallery here. The TEPCO handout on the work: handouts_120913_03-e Work at unit 3 involved looking into the spent fuel pool as they prepare to begin removing debris from what is left of the refueling deck. Most of the images were looking … Read entire article »
Filed under: Reactor 3, Reactor 4, The Latest
Unit 3 Robot Entry Video & New Enhanced Images
[Translate] TEPCO sent robot Quince 2 into unit 3 at Daiichi to inspect the TIPS room. Damage to some of the electrical panels, water on the floors were found. The door for the hallway into the TIPS room was blown into the hallway, door frame and all. The mangled door can be seen blocking the end of the TIPS room hallway. The door frame in pieces with on on the floor in the foreground. The holes in the door frame piece match the holes in the concrete door way. The video can be found here: http://www.youtube.com/watch?v=QIzAXojFLA0&feature=youtu.be PDF document describing findings and radiation readings: handouts_120524_08-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 may also be copyright of other specific original … Read entire article »
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Unit 3 Spent Fuel Pool Videos & Enhanced Images
[Translate] TEPCO finally released the videos of the unit 3 spent fuel pool. The videos do give a better look at the situation than the previously released images TEPCO provided last week. Comments with each image. Images are free to reuse or redistribute, please leave the watermark intact. Click on any image to enlarge. TEPCO videos: http://youtu.be/GK0sL_UA1NM http://youtu.be/4HZa1NjuJAQ http://youtu.be/n89lU9VyYzs http://youtu.be/cVfwjYe0VFM http://youtu.be/8f4u43P2YwM Images: fuel racks with debris and what looks like fuel assembly handles at top. Twisted sheet metal and wire rod in the pool. Twisted sheet metal and what may be the same brown/green algae growing on surfaces. Close up of steel debris. Piece to the right has a jagged edge. Steel beam and piece of rebar to the right. Jagged edge on the steel. Rebar in the pool. Portions of the refueling crane. More refueling crane Debris on top of some sort of sheet material above fuel racks. Close … Read entire article »
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Unit 3 Torus Inspection Video And New Images And Analysis
[Translate] TEPCO has released a video of the 8 minute trip into unit 3. We have some enhanced still images from the video. Some noted information that has come out of the video: The torus room door is bowed out both across the width and height of the door as if it either experienced considerable pressure or was struck by something. Workers could not open the door even with attempts to kick it open. Structures between the air lock door and the torus door had strike damage and large pieces of debris. What looks like a pipe that has been moved about a foot away from original location. Unit 3 video on YouTube. Unit 2 video forthcoming. If you find something new of note please mention over at our HipChat live blog or in the comments. http://www.hipchat.com/gGzSKXslp Images below with … Read entire article »
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TEPCO Sending Workers Into Units 2 & 3 Basements In A Few Hours
[Translate] 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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A Series Of Unfortunate Events at Fukushima Daiichi
[Translate] There have been a number of odd happenings recently at the plant. What they all mean right now is not totally clear. On January 2nd, the day after the widespread new years quake, the radioactive fallout levels in Fukushima and also in Chiba spiked. A weird white ash was reported by some in Chiba, no word if this is related in any way. On January 6th the cesium levels detected leaking out of unit 3′s intake canal tripled in one day. We still have no explanation for the rush of police cars, fire engines and two buses of workers to Daiichi on January 6th (Japan time). Checks of TEPCO’s plant status reports say nothing of an incident at the plant and nothing has been reported out of those who watch the press conferences. There … Read entire article »
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Unit 3 Cooling Was Turned Off The Day Before Explosion
[Translate] The cooling system at unit 3 was turned off the day before the massive explosion. The plant director was not informed for an hour of the action. Suspension of cooling caused the reactor to be without water for 6.5 hours. The RCIC cooling system was running low on battery power. Without checking the reactor pressure, workers shut off the RCIC system and attempted to start a fire pump system to feed water into the reactor. This fire pump system is low pressure and can only operate at 7 atmospheres or less of pressure. Pressure at the time of the attempt was about 40 atmospheres. The fire pump system was unable to inject water due to the high pressure and the batteries required to operate the containment venting system were not working. … Read entire article »
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1.6 Sievert Hot Spot Found In Unit 3
[Translate] Recently a 1.3 Sievert hot spot was found near the containment hatch inside unit 3. This hot spot appeared to be water leaking out of the hatch via a set of tracks in the floor. Now the same area is showing as 1.6 Sieverts. The water is assumed to be leaking from the containment structure and the areas near the hatch are also very high. Unit 3 has had an ongoing problem of levels too high for workers to enter. They have tried a number of things including debris removal, robot vacuuming of the 1st floor but the levels still prevent workers from spending any meaningful amount of time in the building. This is seriously hampering clean up efforts. TEPCO and MOX advocates have previously claimed that the MOX fuel in … Read entire article »
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