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What Happened?



TEPCO turns to cosmic rays to see inside of reactors

TEPCO is turning to cosmic rays to get a look inside the stricken power station’s wrecked reactors, and
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NRA gave ok to dump radioactive water after treatment

The NRA gave the green light to TEPCO’s plan to dump toxic groundwater pumped up at the Fukushima Daiich
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Two died by accidents at Fukushima nuclear plants

Two workers died in separate accidents at the Fukushima Daiichi nuclear power plant and the nearby Daini compl
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Five aging nuclear reactors will be decommissioned in the near future

Five aging nuclear reactors will be decommissioned in the near future, a move that government officials hope w
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Power companies plan to open talks on decommissioning five reactors

Four power companies plan to open talks with municipal governments as early as this month about decommissionin
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Diluting a dust suppressant by TEPCO caused to spread radioactive dust around

TEPCO diluted a dust suppressant that rendered it ineffective and allowed the spread of radioactive materials
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NRA said contaminated water at Fukushima plant needs to be released for the safe decommissioning

The Nuclear Regulation Authority said contaminated water stored at the Fukushima No. 1 nuclear power plant sho
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Anti-terrorism system requires identity checkup for entering nuclear plant

A preliminary anti-terrorism plan to create a system that requires identity checks for people accessing nuclea
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New machine takes less than 30 minutes to detect strontium 90

New updated equipment that is scheduled to go into operation at the Fukushima No. 1 nuclear power plant in Dec
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Effort to stop contaminated water from flowing into a trench at Fukushima NO.1 plant failed

An effort to stop contaminated water from flowing into a trench at the crippled Fukushima No. 1 Nuclear Power
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TEPCO’s most likely not able to finish purifying water by the end of the fiscal year

TEPCO’s goal of purifying all highly radioactive water stored at the Fukushima No. 1 nuclear power plant
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Sodium is a key to new type of nuclear reactor

For sodium, the sixth-most abundant element on the planet, is being held up as the key to one of several new t
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Six new type of nuclear reactors in the world to replace water-cooled models

The Generation IV International Forum was created in 2000 to do research on new types of nuclear reactors to r
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Radioactive water treatment system at Fukushima No.1 has suspended again

TEPCO said its trouble-plagued radioactive water treatment system at the complex has been partially suspended
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TEPCO filed a plan to build a facility for dumping toxic water into the sea

TEPCO filed a plan with regulators on Monday to build a facility for dumping toxic groundwater into the ocean
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TEPCO begin pumping up groundwater on a trial basis

Tokyo Electric Power Co. in Aug 12th began pumping up groundwater at disaster-hit Fukushima Daiichi nuclear po
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Fuel rods in the reactor 3 has also melted down: new estimate by TEPCO

TEPCO said that its new estimate shows that all the fuel rods in reactor 3 at the Fukushima No. 1 nuclear powe
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TEPCO admitted that groundwater bypass operation at Fukushima No.1 is not working

TEPCO admitted on July 28th that the so-called groundwater bypass operation at its crippled Fukushima No. 1 nu
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TEPCO revieled a plan to place blocks of ice in trenches at Fukushima no.1 to stanch the flow of radioactive water

TEPCO unveiled a plan that would place blocks of ice in trenches at the stricken Fukushima No. 1 nuclear power
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20 or more second hand water tanks are used for storing contaminated water

Roughly 20 or more second water tanks holding radioactively contaminated water at the Fukushima No. 1 Nuclear
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Radioactive water leakage was found in the undamaged No.5 reactor

A leak of radioactive water was found in the piping of water used to cool the spent fuel pool in the undamaged
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Ice wall s have failed to form in underground trenches

An ambitious plan by TEPCO to halt the leakage of contaminated water at the Fukushima No. 1 nuclear power plan
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TEPCO can’t confirm whether groundwater bypass operation is working or not

According to TEPCO, it can’t confirm whether the groundwater bypass operation at the Fukushima No. 1 nuclear p
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US gov’t concentrate on developping safter nuclear fuel

In response to the disaster at the Fukushima No. 1 plant, the U.S. government dramatically increased funding t
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TEPCO now able to measure the temperature and level of water in the No.2 reactor container

TEPCO said it is now able to properly measure the temperature and level of water used as a coolant inside the
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TEPCO use US technology to extract strontium from contaminated water

TEPCO will use a truck-mounted filtration system to extract strontium from water stored at the damaged Fukushi
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TEPCO began construction of a huge underground ice wall

TEPCO began construction on June 2nd of a huge underground ice wall around four reactor buildings, it is said
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Construction of underground ice wall gets go-sign by NRA

The Nuclear Regulation Authority said that it will allow TEPCO to begin construction of an underground ice wal
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TEPCO started dumping groundwater from Fukushima No.1 into the ocean

TEPCO dumped into the Pacific Ocean tons of groundwater collected at the Fukushima No.1 plant after having con
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The move of oi reactor is expected to delay due to the new estimate of earthquake

Kansai Electric Power Co. said to raise its earthquake force estimate for its Oi nuclear power plant in Fukui
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Experts question the effect of an ice wall to prevent radioactive water leakage

  The experts and nuclear regulatory officials said at a meeting in Tokyo that they weren’t convinced the
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Combined level of tritium is estimated 900 times than the annual limit

The combined level of radioactive tritium at four reactors at the Fukushima No. 1 Nuclear Power Plant is estim
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Radioactivity levels exceeding in groundwater to release to ocean

Radioactivity levels exceeding standards to release groundwater into the ocean were discovered in a pump well
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Radioactive water overflowed during cleansing of a water treatment

Around 1.1 tons of radioactive water overflowed Wednesday from a container during cleansing of a water treatme
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Highly radioactive water transferred towrong building

TEPCO said on April 14th that about 203 tons of highly radioactive water have been erroneously sent to a build
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Local fishermen finally agreed dump groundwater from Fukushima Daiichi to the Pacific

A local fishermen’s organization on March 25th decided to allow TEPCO to dump groundwater at the Fukushi
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Nuclear plant in Kyusyu is first candidate to restart among 48 Japan’s commercial reactors

Nuclear Regulation Authority decided on March 13th to prioritize the safety review of two reactors at Kyushu E
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[Three years after 3.11] Still radioactive water is big challenge

Three years having passed since the outbreak of the Fukushima No. 1 Nuclear Power Plant disaster, radioactive
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Tritium is a serious obstacle to work to decommisionning

Getting the radioactive element tritium out of even treated water has become a serious obstacle to work to dec
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Radioactive water is a major challenge in Fukushiam No.1 three years after 3.11

Since three years has been past since the Great East Japan Earthquake, struggling to tackle the buildup of hig
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Cooling system stoped by human error again

The cooling system at the No. 4 unit spent fuel pool at Fukushima Daiichi temporarily halted on Feb 25th after
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100 tons of highly contaminated water leaking from tank at Fukushima No.1

Roughly 100 tons of highly radioactive water leaked from one of the huge tanks at the Fukushima Daiichi nuclea
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54,000 Bq cesium found in groundwater, record high

TEPCO said on Feb 13th that it has detected a record 54,000 becquerels of radioactive cesium per liter in grou
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Gov seek approval of fishermen to dump groundwater at Fukushima Daiichi

The government on Feb 3rd sought approval of a nationwide fisheries federation to dump groundwater at the Fuku
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No. of nuclear power plant drop from 54 to 48

Two reactors at the accident-stricken Fukushima Daiichi nuclear power plant were classified as defunct , reduc
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Method to use cosmic rays to see through a reactor was developed

Japanese scientists have developed a method to use cosmic rays to see through a nuclear reactor, raising hopes
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Latest water leak could be from primary containment vessel

TEPCO said that highly radioactive water found on the floor of the No. 3 reactor building could be a sign that
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A worker internally exposed to radiation at Fukushima No.1

A worker at Fukushima No. 1 Nuclear Power Plant has been confirmed to have suffered internal exposure to radia
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New leak found at No.3 reactor at Fukushima Daiichi

Water that could contain radioactive material has been pouring into a drain on the first floor of the No. 3 re
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Nuclear regulators urges TEPCO to take action for the rising radiation level at the plant

Nuclear regulators called on TEPCO to take action to address the rising radiation level at the border of Fukus
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Fuel meltdown experiment taken place in March in Fukushima

The Japan Atomic Energy Agency is planning to melt a small nuclear fuel rod in an experiment at its research f
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Former TEPCO employee collecting donation to improve working condition of plant workers

As a former employee of TEPCO., Akihiro Yoshikawa says he knows about the miserable conditions, declining mora
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Ari dose level in 80-kilometer area surrounding Fukushima No.1 dropped by 47% since Nov. 2011

Air dose levels in an 80-kilometer area surrounding the crippled Fukushima No. 1 nuclear power plant have drop
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Highest estimated radiation recorded at outdoor location of Fukushima Daiichi

TEPCO said Dec. 6 it detected the highest estimated radiation level for an outdoor location at the Fukushima N
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IAEA proposed TEPCO consider discharging water from Fukushima Daiichi

A team of experts from the International Atomic Energy Agency proposed that TEPCO consider discharging less ha
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1.1million becquerels of beta ray radioactive substance was found, which is 36,000 times more than permissible level

TEPCO said on Dec. 2 that it has detected radioactive materials that topped 36,000 times the permissible level
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ALPS system was switched off due to leakage of hydrochloric acid

Advanced Liquid Processing System (ALPS) for the decontamination of radioactive water at Fukushima No. 1 nucle
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A worker accidentally dropped camera at inside of spent fuel pool

A Worker at the Fukushima Daiichi nuclear power plant on Nov 28th accidentally dropped an underwater camera in
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TEPCO postpone removal of groundwater du to a shortage of water storage

TEPCO said that a shortage of water storage tanks has forced it to postpone removal of radioactive groundwater
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IAEA begins reviewing the fuel removal work

IAEA expert team began reviewing fuel removal work that has just started at a spent fuel pool inside the damag
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TEPCO hoping to restart 4 nuclear reactors in Niigata by 2015

  TEPCO hopes to have four nuclear reactors in the Kashiwazaki-Kariwa plant in Niigata Prefecture back on
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Start Spend fuel removal work possiblily from Nov. 26

Work to remove spent fuel from a storage pool inside No.4 reactor building at the Fukushima Daiichi nuclear po
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TEPCO plans to shut down No. 5,6 reactors

TEPCO plans to permanently shut down two reactors at the Fukushima Daiichi which avoided meltdowns during the
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Fuel removing project entered a second day

TEPCO said on Nov 19th that work to remove fuel from the spent fuel pool at the No. 4 reactor building had ent
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TEPCO starts yearlong fuel removing project

TEPCO started a yearlong operation on Nov.18th to remove fuel from a pool at the No. 4 reactor building, which
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Interview to the famous plant worker on Twitter by Asahi Newspaper

Asahi Newspaper interviewed a worker in Fukushima Daiichi nuclear power plant who is famous on Twitter as his
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IAEA mission visit Japan to study about the fuel removal work

According to the government, IAEA experts will visit Japan later in November to study the fuel removal work at
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Interview to the chief researcher at the Meteorological Research Institute on the contamination of the ocean

Radioactive substances from the Fukushima No. 1 nuclear plant will dilute to negligible levels in the ocean, b
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TEPCO build new drainage for preventing toxic water flowing to the ocean

TEPCO said on Nov.11th that it will build a new drainage channel to prevent toxic water from directly flowing
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TEPCO has no idea yet where to store radioactive rainwater in underground tanks

TEPCO has yet to figure out what to do with 2,700 tons of radioactive rainwater now stored in two underground
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TEPCO start removing fuel at Fukushima No.4 reactor

TEPCO says it is ready to begin removing nuclear fuel assemblies from the spent fuel pool of the reactor 4 bui
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IAEA experts check contamination in the sea

Two IAEA experts on Nov.7th began to help checking Japan’s marine radiation monitoring activities off th
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Fuel removal test will conduct at No.4 reactor

TEPCO will conduct a test for nuclear fuel removal at the No. 4 reactor building at the Fukushima Daiichi powe
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TEPCO considering separating reactor decommissioning division as in-house company

TEPCO is considering setting up an “in-house company” to deal with decommissioning the Fukushima N
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TEPCO work with US in decommissioning Fukushima No.1 plant

TEPCO will work with the U.S. Department of Energy in decommissioning the Fukushima No. 1 nuclear plant and th
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Cesium again found 1km off the coast of Fukushima Daiichi

TEPCO said on Oct 22nd that it has detected radioactive cesium about 1 kilometer off the coast of Fukushima Da
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Rain water spilled from barriers contained radioactivity

TEPCO said on Oct 21st that some of the rainwater that spilled from concrete barriers around clusters of tanks
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Highest radioactivity found at the ditch near the sea

The highest level of beta ray-emitting radioactive substances, such as strontium, has been detected at one poi
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Report from Asahi news: motivation of workers declining at Fukushima Daiichi

According to Asahi newspaper, a series of recent accidents at the Fukushima No. 1 nuclear power plant may be s
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A pump to inject water into reactors stopped by huma error

A pump to inject water into one of the severely damaged reactors at the Fukushima Daiichi nuclear plant stoppe
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New leakage found to flow into the ocean at Fukushima Daiichi

TEPCO said on Oct 2nd that it has found that an unspecified amount of water with a highly concentrated radioac
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EX-US nuclear regulatory chief criticized slow reaction over water leakage

A former U.S. nuclear regulatory chief said on Sept. 24 that leaks of contaminated water at the Fukushima plan
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TEPCO might be split into two companies in order to concentrate on decommissioning work

A senior official of the ruling Liberal Democratic Party has proposed that TEPCO be split up through the creat
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Magnitude 5.9 hit coastal zone of Fukushima in midnight

A magnitude 5.9 earthquake struck Fukushima at early morning of Sept 20th. No abnormalities were observed at t
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NRA launched the investigation of the contamination of the seafloor

Japan’s Nuclear Regulation Authority on Sept 18th started an investigation of the contamination of the s
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Abe urges TEPCO to scrap No. 5 and 6 reactors

Prime Minister Shinzo Abe said that he urged TEPCO to scrap No.5 and 6 reactors at the Fukushima Daiichi nucle
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TEPCO found exhaust stack damaged by March 11th earthquake

Tokyo Electric Power Co. (TEPCO) announced on Sept. 18 that it has confirmed that steel struts for the exhaust
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1,130 tons of rainwater with radioactive substances dumped to the sea

TEPCO said on Sept 27th that it has dumped into the Pacific Ocean about 1,130 tons of rainwater caused by mass
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Japan seek the possibility of S. Korea lifting ban against Japanese fish

The Japanese Fisheries Agency will send a senior official to South Korea to ask the country to reconsider its
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TEPCO: radioactive water might be leaked to the Pacific Ocean

Tokyo Electric Power Co. workers reported detecting high levels of radioactive strontium in a drainage ditch c
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US nuclear expert invited as outside adviser to tackle on the water leakage

TEPCO said on Sep 10th that it will invite U.S. nuclear expert Lake Barrett to as an outside adviser so as to
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Radioactive water might be mixed with ground water already

TEPCO said on Sep 5th that it has detected 650 becquerels per liter of radioactive substances from groundwater
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Trying to hide radioactive water leaking to win the Olympic bid

The leader of Tokyo’s bid for the 2020 Olympics has sent a letter to IOC members in order to reassure th
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TEPCO filed a criminal complaint over water leakage

Three people on Sep 3rd filed a criminal complaint against TEPCO and 32 of its current and former executives w
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Drop from the tank-connecting pipes contained very high radioactivity

TEPCO announced on Sept. 1 that 300 million becquerels of radiation per liter was detected in water leaking fr
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New leak was found, highest reading is 1,800 millisieverts per hour

Very high radiation levels were observed on Aug 31st at three tanks and one of the pipes connecting them at Fu
[Read More]


Voice of plant workers:tanks at the site were feared to be leaked

The water storage tanks at Fukushima Daiichi plant were built hastily and it was feared at the time that toxic
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Will TEPCO accept oversea support?

Since TEPCO admitted on leaking radioactive water to the Pacific Ocean on July 22,international media attentio
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Fishermen pressure TEPCO to end the radioactive water leakage

A national fishermen’s organization on Aug 29th pressed TEPCO to ensure there will be no further leaks o
[Read More]


Japan and Ukraine agree for joint study on nuclear impacts

Japanese Foreign Minister Fumio Kishida and his Ukrainian counterpart Leonid Kozhara agreed on Aug 26th that t
[Read More]



Fukushima Stories&Facts

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