Fukushima 10 years after the disaster

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Exnihiloest
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Re: Fukushima 10 years after the disaster




by Exnihiloest » 21/04/21, 18:49

It is necessary to make the share of the things. The duration of the (half) life of tritium is 12,3 years, and its radioactivity, β- therefore electrons, of low energy, stopped by water or biological tissues after a journey of only 6 µm. We are far from the filth of gamma radiation and neutrons.
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GuyGadeboisTheBack
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Re: Fukushima 10 years after the disaster




by GuyGadeboisTheBack » 21/04/21, 19:03

And what is left in the filters, what do they do with it? And the other half of life?
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Re: Fukushima 10 years after the disaster




by ENERC » 21/04/21, 19:16

Exnihiloest wrote:It is necessary to make the share of the things. The duration of the (half) life of tritium is 12,3 years, and its radioactivity, β- therefore electrons, of low energy, stopped by water or biological tissues after a journey of only 6 µm. We are far from the filth of gamma radiation and neutrons.

For once I agree: besides Wikipedia indicates:
the biological half-life (roughly equal to the effective half-life in the case of tritium) varies according to the form in which the tritium is fixed. Regardless of the form of the tritium intake, most of the tritium is considered to be eliminated in 1 month and almost all of it is eliminated in less than 1 year. Its biological half-life is therefore much less than its radioactive half-life;

So you have to drink contaminated water in large doses (several liters per day).
The risk is perhaps more on plankton and crustaceans and possibly fish.

If the water only contains tritium, it works: on the other hand, if there are micro particles of plutonium, then it is totally different.
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Exnihiloest
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Re: Fukushima, 10 years later: radiation dissipates faster than worry




by Exnihiloest » 22/04/21, 16:57

A recent article:

Fukushima, 10 years later: radiation dissipates faster than worry

"The reservoirs are approaching full capacity, and Japanese authorities have been delaying for years when this water should be discharged into the ocean. After a decade, the levels of materials like tritium are too low to be considered a threat to marine life, but this does not reassure fishermen or farmers who live close to the coast.."
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GuyGadeboisTheBack
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Re: Fukushima, 10 years later: radiation dissipates faster than worry




by GuyGadeboisTheBack » 22/04/21, 17:07

Exnihiloest wrote:A recent article

Here, an article from m ... pro nuclear.
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Obamot
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Re: Fukushima 10 years after the disaster




by Obamot » 22/04/21, 17:10

It is recommended that fish dilute this with water before drinking it. : Twisted:
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Re: Fukushima 10 years after the disaster




by Exnihiloest » 22/04/21, 17:39

Obamot wrote:It is recommended that fish dilute this with water before drinking it. : Twisted:

This will necessarily be the case. Since tritium is a gas (hydrogen), when they talk about releasing it, it's releasing tritiated water, I guess. And the risk depends on the concentration of the isotope 3H in the water molecules, which will still disperse widely due to the fact that the quantities remain infinitely small compared to the volume of the oceans. We can only hope that they will have the intelligence not to release everything in high doses and in one place.
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Leo Maximus
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Re: Fukushima 10 years after the disaster




by Leo Maximus » 22/04/21, 20:20

ENERC wrote:They just have to put this radioactive water in an old then oil or gas - there or we want to bury the CO2 by capture. In 123,2 ± 0,2 years the radioactivity will have been divided by 1024.

I have an idea: this radioactive water is transported to the geological disposal site at Bure, in order to carry out tests for a century to see if the bouzin is well sealed. After a century, water is returned to Japan (it will hardly be radioactive anymore).
At least, if it works for a century, we can put our radioactive bins there for a few hundred thousand years.
The advantage is that if it leaks, it is easier to pump even radioactive water than to come out of rusty containers.

From now on, we can still use the Senate garden: it can serve as a small educational demonstrator - history that our dear senators generously paid by our taxes can benefit from a highly technological demonstrator for the first time when they stuff themselves with petits fours with our money.

A priori, the idea is not bad, we could use the old abandoned coal mines to store tritiated water at its current concentration of 1 million becquerels per liter. These mines will never be exploited again. But the rocks will react badly to contact with tritiated water which is very corrosive because of the phenomenon of radiolysis. There will be gas releases. The least bad solution is dumping at sea.

The Japanese gvt ended up giving in to the IAEA, which has been pressuring Japan for 7 years so that this water is discharged into the sea. Why? Because Japan must do like all other countries: throw tritium into the sea.



France pours phenomenal quantities of tritiated water into the sea. This is out of all proportion to what is stored in Fukushima.

Map of tritium in the English Channel published by IRSN on its website. We have> 5 becquerels in the waters in front of Dieppe. In the port of the Fukushima Daiichi power station, the tritium level is below 1,5 becquerel (measurement threshold).

The ORANO plant in La Hague discharges an average of 1000 terabecquerels PER MONTH of tritiated water in the English Channel. This is more than the water stored at Fukushima Daiichi for 10 years (900 terabecquerels). It's always easier to see the straw in your neighbor's eye than the beam in yours ... : Lol:

IRSN - Tritium level in the Channel.jpg
IRSN - Level of tritium in the Channel.jpg (154.03 KiB) Viewed 2365 times
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moinsdewatt
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Re: Fukushima 10 years after the disaster




by moinsdewatt » 21/08/21, 12:33

the IAEA will monitor releases of tritiated water into the sea.
These releases will spread over a very long period, probably more than 10 years.

Agreement on IAEA monitoring of Fukushima water release
09 July 2021

The scope of technical assistance the International Atomic Energy Agency (IAEA) will provide in monitoring and reviewing the planned discharge of treated water stored at the Fukushima Daiichi nuclear power plant site has been agreed. The Terms of Reference defining the objective of the IAEA's assistance, how it will be implemented and its organizational arrangements were signed yesterday by the agency and the Japanese government.

Image
Tanks of treated water at the Fukushima Daiichi site (Image: Tepco)

The document was signed by IAEA Deputy Director General Lydie Evrard, who heads the agency's Department of Nuclear Safety and Security, and Ambassador Takeshi Hikihara, Japan's permanent representative to the international organizations in Vienna.

At the Fukushima Daiichi site, contaminated water is treated by the Advanced Liquid Processing System (ALPS), which removes most of the radioactive contamination, with the exception of tritium. This treated water is currently stored in tanks on-site. The total tank storage capacity amounts to about 1.37 million cubic meters and all the tanks are expected to be full around the summer of 2022.

In April, the Japanese government announced its formal decision that the treated water stored at the Fukushima Daiichi site will be discharged into the sea. The basic policy calls for the ALPS-treated water to be discharged "on the condition that full compliance with the laws and regulations is observed, and measures to minimize adverse impacts on reputation are thoroughly implemented".

After its announcement, the Japanese government requested assistance from the IAEA to review the country's plans and activities against international safety standards and also to support and be present during environmental monitoring operations there. The IAEA has said Japan's chosen disposal method is both technically feasible and in line with international practice.

"The signing of the Terms of Reference marks an important step as the document sets out the broad framework for how the IAEA will support Japan when it implements its plan to gradually release the treated water in a safe and transparent way," the IAEA said. "The agency's involvement before, during and after the water disposal will provide confidence - in Japan and beyond - that it takes place in line with the international safety standards which aim to protect people and the environment."

The IAEA said the signing of the document allows it to plan and implement a detailed program of activities including review missions, in line with relevant IAEA safety standards and guidance. The first mission is expected to travel to Japan later this year.

Under the agreed terms, the IAEA will examine key safety elements of Japan's discharge plan, including: the radiological characterization of the water to be discharged; safety related aspects of the water discharge process; the environmental monitoring associated with the discharge; the assessment of the radiological environmental impact related to ensuring the protection of people and environment; and, regulatory control including authorization, inspection and review and assessment.

An IAEA Task Force will implement the assistance to Japan, which will include advice by a group of internationally recognized experts from Member States, including members from the region, under the authority of the IAEA Secretariat.

Japan intends to start releasing the treated water in about two years' time, and the entire operation could last for decades.

Tokyo Electric Power Company, operator of the Fukushima Daiichi plant, said it will "continue to move forward with suitable handling of ALPS-treated water based on the advice, etc. received during this review".

“The IAEA will play a vital role in monitoring and reviewing Japan's implementation of its plan,” said IAEA Director General Rafael Mariano Grossi. "As the eyes of the international community, IAEA experts will be able to verify that the water discharge is conducted safely. This is of paramount importance to reassure people in Japan and elsewhere in the world, especially in neighboring countries, that the water poses no threat to them. "


https://www.world-nuclear-news.org/Arti ... a-water-re
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moinsdewatt
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Re: Fukushima 10 years after the disaster




by moinsdewatt » 21/08/21, 12:38

Continuation of the post above.
Tritiated water will be discharged into the sea after dilution to 1500 Becquerels per liter.

IAEA safety assurance begins for Fukushima water release

20 August 2021

Details have been agreed of support that the International Atomic Energy Agency (IAEA) will give to Japan during the release of tritiated water from the Fukushima Daiichi site. IAEA's first official visit will be in September, ahead of the release of the water, which will be diluted to drinking-water quality.

Rafael Mariano Grossi, the IAEA director general, met with Hiroshi Kajiyama, the Japanese Minister of Economy, Trade and Industry yesterday. Kajiyama officially invited the IAEA to make its first visit in this area of ​​cooperation, which Grossi said was "an important step in our preparations."

"Japan's invitation for the Agency to make its first visit on the ground at this early stage, especially during the ongoing pandemic, shows their willingness to conduct the entire operation in a safe and transparent manner," said Grossi.

At the Fukushima Daiichi site, contaminated water is treated by the Advanced Liquid Processing System (ALPS), which removes most of the radioactive contamination, with the exception of tritium. This treated water is currently stored in tanks on-site. The total tank storage capacity amounts to about 1.37 million cubic meters and all the tanks are expected to be full around the summer of 2022.

According to Japan's announced policy, the tritium will be diluted to 1500 becquerels per liter, which is one-fortieth of the concentration permitted under Japanese safety standards and one-seventh of the World Health Organization's guideline for drinking water.

In fact, the total annual amount of tritium to be discharged will be below the operational target value for the Fukushima Daiichi plant before the accident, which was 22 trillion becquerels per year. Figures from the US Nuclear Regulatory Commission (NRC) show that this level is also typical of US nuclear power plants during normal operation. "Tritium is one of the least dangerous radionuclides because it emits very weak radiation and leaves the body relatively quickly," the NRC notes in a public document on routine radioactive releases.

Nevertheless, the high profile of the accident-struck Fukushima Daiichi site and the loss of trust surrounding its operation have made the release a highly contentious issue among local people and led to its politicization abroad.

Grossi said: "These on-site meetings and activities will help build confidence that the discharge takes place in line with the international safety standards which aim to protect people and the environment."

The first IAEA visit on the matter, now slated for September, will follow a scope of work agreed in July. At that time, the IAEA said that its "involvement before, during and after the water disposal will provide confidence - in Japan and beyond - that it takes place in line with the international safety standards which aim to protect people and the environment."

"As the eyes of the international community," said Grossi, "IAEA experts will be able to verify that the water discharge is conducted safely. that the water poses no threat to them. "

The IAEA and Japan also agreed to cooperative work on human resources and the dissemination of information on nuclear energy.

https://www.world-nuclear-news.org/Arti ... ma-water-r

the 1.37 million m3 ca represents for the 126 million Japanese a quantity of 11 liters per Japanese (before dilution).
Or a well-filled watering can.
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