Fukushima Daiichi: the situation (one year) after (ASN and IRSN)

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Re: Fukushima Daiichi: the situation (one year) after (ASN and IRSN)




by moinsdewatt » 17/02/17, 22:24

[Video] In Fukushima, the robot scorpion Tepco collection of new data in the containment of the nuclear power plant

Usine Nouvelle the 16 / 02 / 2017

Live video of Fukushima, the Japanese Robot Scorpion electricity producer Tepco sent new information during its exploratory activities of the Daiichi nuclear plant.

Tepco published this Thursday, February 16 on its Facebook account images of unit 2 of the primary containment (PCV in English initials) of the plant taken by a Robot-Scorpion. The robot was inserted in the heart of the PCV, it borrowed a CRD rail which led it directly to the area below the reactor pressure vessel called the "pedestal area".

The unit has collected additional data inside the PCV, the deposition conditions, temperature variations and radiation levels. This information should allow TEPCO to continue to investigate and analyze the fuel residues, he said.

Even if the robot could not reach the pedestal zone, as originally planned, valuable information was obtained which should allow the Japanese company to determine the methods for these eliminated fuel residues. Meanwhile, the robot has been left inside the PCV with the aim of further investigations.


http://www.usinenouvelle.com/article/vi ... re.N503014
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Re: Fukushima Daiichi: the situation (one year) after (ASN and IRSN)




by Remundo » 18/02/17, 00:14

very good article, and good video. thank you Christophe 8)
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Re: Fukushima Daiichi: the situation (one year) after (ASN and IRSN)




by Christophe » 05/03/17, 17:21

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Re: Fukushima Daiichi: the situation (one year) after (ASN and IRSN)




by moinsdewatt » 29/04/17, 14:19

A youtubor ventures into the radioactive areas of Fukushima

Marise Ghyselings | Published on 8 April 2017

Urbex takes a whole new meaning with Le Grand JD. This Swiss youtube driver spent a day in the abandoned and radioactive areas of Fukushima, six years after the disaster. Result: a video of 23 minutes, post-apocalyptic.
The Grand JD continues to take risks. After his video in Iraq, Julien Donzé of his real name took the direction of Japan to venture into the red zone of Fukushima, "a forbidden zone because contaminated", the green zone being completely free of access and orange Accessible with restrictions.

Six years after the nuclear accident, caused by an earthquake and a tsunami, these cities are completely abandoned. Ghost towns with post-apocalyptic gaits.
Accompanied by Benoit and Sébastien of the Ici Japon chain, the JD calculates the radioactivity in the air using a gieger meter, knowing that the average in the normal zones is between 0,1 and 0,2 microSievert. After a few minutes on the road 6, the one that crosses the red zone, the meter displays 1,29 μSv and will reach in a few seconds 1,96. A cancer risk is real if the person is exposed to 1,25 for one year. "There are guys who work, we feel safe but we did well to take combinations," explains the youtubor of Ici Japan.

Immediate Abandonment

Mannas filled with abandoned clothes in laundries, intact casino machines, a cemetery of cars never opened in six years, shops devastated by the earthquake and the tsunami ... Situations allow us to relive the moment when the Japanese Had to stop their occupations and leave everything instantly. Indeed, the places give the impression of having been abandoned the day before. Only reminders: the dust and the smell, which one would almost regret not feeling.

https://parismatch.be/actualites/enviro ... -fukushima

23 minutes of video. 2h30 in the red zone around Fukushima. Plus a few hours in the orange zone.
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Re: Fukushima Daiichi: the situation (one year) after (ASN and IRSN)




by moinsdewatt » 22/08/17, 19:26

Fukushima: the underground ice wall of 1,5 km soon finished


By AFP the 22.08.2017

The operator of the rugged Fukushima plant in northeastern Japan began Tuesday to freeze the last section of a 1,5 km underground ice wall to prevent radioactive contamination of water flows.

The operation consists of sinking a refrigerant to a depth of 30 meters, in pipes placed vertically around four of the six reactors of the site, the most damaged of the plant jeopardizing the 11 March 2011 by a gigantic tsunami.

Image

This is to prevent groundwater coming from the mountain and going down to the sea into the basements of the reactors where it is contaminated with radioactive debris.

According to Tokyo Electric Power (Tepco), there remain 7 unfrozen meters.

The work began in March 2016 but had been suspended, pending further arrangements, in order to cope with a possible excessive influx of water (in case of very heavy rain, for example), which would not have escape.

Following the steps taken, the Nuclear Regulatory Authority agreed to complete the work.

Previously, until 400 tons of water passed daily through the facilities, a reduced quantity to 140 tons currently and which should drop below 100 tons once the last meters frozen, according to a spokesman for Tepco.

It will take weeks, however, for the earth around the remaining stretch to be trapped in ice.

Because such a technique has never been used over such a length, experts doubt its effectiveness in the medium term.

The problem of contaminated water is one that has complicated since the start the work to dismantle the six reactors of the site, a titanic task that will take at least four decades.

Hundreds of tanks (which have sometimes leaked) had to be installed to contain the contaminated liquid, devices have been set up to partially clean it, but at least one radioactive element, tritium, remains in the hundreds of thousands of tons of water conserved on site.

The International Atomic Energy Agency (IAEA), the Japan Nuclear Authority and experts believe that ultimately there will be no alternative but to reject it in the neighboring Pacific which strongly oppose the ecologists and fishermen of the region.


https://www.sciencesetavenir.fr/nature- ... ini_115671
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Re: Fukushima Daiichi: the situation (one year) after (ASN and IRSN)




by moinsdewatt » 24/03/18, 20:59

Restart of the 3 reactor of the Genkai plant.
It is now the 7 eighth reactor to have restarted in Japan after Fukushima


Southwestern Japan nuclear reactor back online after 7-yr hiatus

March 23, 2018 (Mainichi Japan)

A nuclear reactor at the Genkai power plant in southwestern Japan lingering lingering between residents about evacuating from islets near the plant in the event of a serious accident.

Kyushu Electric Power Co.'s No. 3 is one of the most important plants in the world, and is one of the largest in the world.

The reactor cleared the safety regulation by the Nuclear Regulation Authority in January 2017 under strict, post-Fukushima crisis regulations and was later approved for reactivation by the Genkai Municipal Government and Saga Prefectural Government. It became the seventh reactor in Japan to restart under the strict regulations.

The government of Prime Minister Shinzo Abe, which views nuclear power as an "important base-load power source," is promoting the restart of nuclear reactors considered safe by the regulator.

Local residents, especially those living on 17 islands within 30, are located on the island of Kyushu.

Trade and Industry Minister Hiroshige Seko welcomed the resumption saying, "(The restart) holds significance from the point of promoting so-called pluthermal power generation and recycling nuclear fuel."

The Genkai plant's No. 3 Reactor Generating Power Using Mixed Oxide, or MOX fuel, which is created from plutonium and uranium extracted from fuel.


Early Friday, a group of about 100 citizens gathered in front of the Genkai plant, protesting against the resumption and calling for shutdowns of all nuclear plants in Japan.

Chuji Nakayama, a 70-year-old man who lives on Iki Island in Nagasaki Prefecture within about a 30-kilometer radius of the plant, expressed anger, saying, "How can islanders escape if an accident occurs?"

Kenichi Arakawa, the deputy chief of an anti-nuclear group who lives in Munakata, Fukuoka Prefecture, said, "An accident could deprive nearby residents of everything in their lives. We should not operate a nuclear plant that threatens our lives."

Meanwhile, a 70-year-old man from the town of Genkai said, "The town will finally become vibrant again because the nuclear plant helped set up roads and create jobs while bringing in more people."

Kyushu Electric plans to start commercial operation of the No. 3 Genkai unit in late April. It is the third reactor reactivated by the utility, following the Nos. 1 and 2 units at the Sendai complex in Kagoshima Prefecture, which cam back online in 2015.

The operator also plans to restart the 4 unit at the Genkai plant in May, after that passed to NRA safety assessment in January 2017.


https://mainichi.jp/english/articles/20 ... dm/052000c
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Re: Fukushima Daiichi: the situation (one year) after (ASN and IRSN)




by moinsdewatt » 29/04/18, 14:19

2 $ billions of cleaning expenses in Fukushima in 2018, same in 2019 and 2020. that's short term.

The final score could climb to 75 billion for the next few decades.



Total Tally For Fukushima Decommission Is $ 75 Billion

By Irina Slav - Mar 30, 2018,

The decommissioning of the Fukushima nuclear power plant will cost an annual US $ 2 billion (220 billion yen) until 2021, an unnamed source told the Japan Times.

Half of the money will be used to tackle the radioactive water buildup at the site of the plant and for removing radioactive fuel from the fuel pools. A small amount of funds will be used to retrieve the effects of tsunami disaster.

The US $ 6 trillion for the three years is only part of the total estimated cost for taking Fukushima out of operation.

The total decommissioning tally came in at US $ 75 trillion (8 trillion yen), as estimated by the specific set Nuclear Damage Compensation and Decommissioning Facilitation Corp. (NDF). That's more than the initial estimate of the costs around the NPP's decommissioning.

Now the operator of Fukushima, Tepco, and the NDF are submitting their financial plan for the facility to the government for approval by the energy industry minister.

In addition to the US $ 6 billion allocated for the cleanup, Tepco will spend another US $ 1.88 trillion (200 trillion yen). This seems to be the biggest challenge for cleanup efforts because of the still high radiation levels and technical difficulties.

Tepco is still reeling from the effects of the 2011 tsunami and resulting nuclear meltdown. Around 15,000 people died in March 2011, when a magnitude-9 quake caused a deadly tsunami and erased the coastline in the area of ​​the nuclear power plant.

At the end of 2016, the Japanese government revised upwards the total costs of the US $ 192 trillion (21.5 trillion yen), stepping up the pressure to clean up its actions and implement urgent reforms to its safety procedures.


https://oilprice.com/Latest-Energy-News ... llion.html
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Re: Fukushima Daiichi: the situation (one year) after (ASN and IRSN)




by moinsdewatt » 12/01/19, 22:22

Fukushima: five years in prison for former Tepco executives
Former operators of the Japanese nuclear plant are being prosecuted for "negligence causing death".


By Philippe Mesmer Published on January 04 2019

Five years of detention, the maximum provided by law. That was the required punishment, on Wednesday, December 26, against Tsunehisa Katsumata, chairman of 2002 at 2012, Tokyo Electricity Company (TEPCO), and his two vice-chairmen, Ichiro Takekuro and Sakae Muto, for their responsibility for the Fukushima nuclear disaster, caused by the March 2011 earthquake and tsunami. Today retired who would be peaceful, the three men are judged for "negligence resulting in death".

Specifically, they are criticized for their contentious management of Tepco's nuclear activity, causing the disaster and its aftermath, including the death of forty-four people in the chaotic evacuation of a hospital at the time of the disaster. drama. For the prosecution, the three former leaders did not take sufficient account of the tsunami risk. The prosecutors blame them for having in their possession data mentioning the risk of waves exceeding 15 meters high, which can cause a power failure. "They should have suspended the activity of the nuclear power plant" until the implementation of preventive measures, said the floor.
.........
........


https://www.lemonde.fr/planete/article/ ... _3244.html
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Re: Fukushima Daiichi: the situation (one year) after (ASN and IRSN)




by moinsdewatt » 10/03/19, 20:12

Eight years after the disaster, where is the dismantling of the Fukushima power station?

Posted on Sunday 10 March 2019
by Bastien Deceuninck

The 11 March 2011, an earthquake followed by a tsunami, caused the fusion of the cores of three of the reactors of the Japanese nuclear power plant Fukushima Dai-ichi. Eight years later, decommissioning operations are continuing, and are far from over.

Image

Eight years after the disaster, hundreds of people are still fighting to dismantle the Fukushima Dai-ichi nuclear plant. The operations are planned to last until around 2050 says Thierry Charles, the deputy director in charge of security at IRSN, the institute of radiation protection and nuclear safety.

FRANCE INTER: What does the site of the Fukushima plant look like today?

Thierry Charles: In eight years, the site has changed. There were building constructions to accommodate people who intervene with a canteen, but also buildings to store the fuel in good condition that were recovered in the reactor buildings. Above all, the large amounts of water used to cool the reactors must be stored and accumulated over time. Today there are more than one million cubic meters of water stored after decontamination. This is one of the biggest problems that will have to manage TEPCO (the company that manages the plant) because every day that passes, it is between 100 and 200 cubic meters of water used in addition that accumulate .

Why can not we reject this water?

This water is treated to reduce the radioactivity, but it remains nonetheless radioactive, and it is not known what will become of these waters. Locals and fishermen do not want to see new releases of radioactive waste from the plant. Tepco will have to find a solution for these waters. They are therefore seeking all possible solutions to treat the radioactivity that is still present. But this water contains tritium, a radioactive product very difficult to eliminate. The most logical solution would therefore be to achieve controlled and controlled release into the environment. But for that, Tepco must demonstrate that this solution is the one that would be the most reasonable considering the existing possibilities.

Are there other issues on the site?

First, there is the recovery of the good fuels that are present in the pools associated with the reactors. Tepco started emptying one in 2014. Another must be emptied this year, and two more in 2023. The last issue is to recover the fuel that has melted and is at the bottom of the reactors. Tepco would like to start this operation a little after 2020, knowing that the company estimates that the complete decommissioning of the plant will take 30 to 40 years.


https://www.franceinter.fr/amp/environn ... -fukushima
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Re: Fukushima Daiichi: the situation (one year) after (ASN and IRSN)




by Leo Maximus » 10/03/19, 22:37

moinsdewatt wrote:Why can not we reject this water?

This water is treated to reduce the radioactivity, but it remains nonetheless radioactive, and it is not known what will become of these waters. Locals and fishermen do not want to see new releases of radioactive waste from the plant. Tepco will have to find a solution for these waters. They are therefore seeking all possible solutions to treat the radioactivity that is still present. But this water contains tritium, a radioactive product very difficult to eliminate. The most logical solution would therefore be to achieve controlled and controlled release into the environment. But for that, Tepco must demonstrate that this solution is the one that would be the most reasonable considering the existing possibilities.

This information is not entirely accurate.

Tepco wants to store this tritiated water on the site as long as possible (it will no longer be radioactive in ... 80 100 years) but we want to force Tepco to reject it at sea.

It has been shown that the tritiated water molecule settles in the DNA. The half-life of tritium is 12,3 years. Tritium disappears by destroying DNA ...

Tritium did not exist in nature before the nuclear age. Now, it is common to measure 15 Bq of tritium per liter of water.

The least bad solution would be to store tritium.
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