Archive for Nuclear Reactors

Robots keep “dying” from radiation in Fukushima, making the nuclear fallout investigation impossible

Posted in 2017 with tags , , , , , , , on March 9, 2017 by theboldcorsicanflame


SOURCE: Robots keep “dying” from radiation in Fukushima, making the nuclear fallout investigation impossible

Naohiro Masuda, the head of decommissioning for TEPCO, has acknowledged that they will have to start thinking “out of the box” if they are ever going to be able to examine the bottom of the core and determine where the melted debris is located.

And that out of the box thinking needs to happen quickly if they are to meet their schedule of beginning the actual clean-up work in 2021.

Radiation levels remain incredibly high at the plant. Last month, TEPCO used a remote-controlled camera and a special measurement device to take readings of the radiation levels near the core of reactor 2. While levels at the core were 73 sieverts per hour immediately after the disaster, they have now reached as high as 530 sieverts per hour. Humans exposed to this level of exposure would die almost immediately, while a robot could survive no longer than two hours. Scientists are unsure whether the radiation levels have risen considerably, or if they are only now being measured accurately for the first time. They also worry that since readings can still only be taken at a distance, the true radiation levels could be far higher. Either way, the findings cast further doubt on TEPCO’s ambitious plan to start cleaning the site up in only four years.

In the meantime, the radiation in the area has had a devastating effect on the region’s agriculture, and thousands of people remain displaced from their homes. It can only be hoped that TEPCO will come up with a better solution to determining the extent of the damage than dying robots, and they need to do so soon.

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Radiation levels inside a stricken reactor at Japan’s Fukushima nuclear plant have hit a record high capable of shutting down robots within 2 hours!!

Posted in 2017 with tags , , , , , , , , , , , , , , , on February 3, 2017 by theboldcorsicanflame


Radiation levels inside a stricken reactor at Japan’s Fukushima nuclear plant have hit a record high capable of shutting down robots, in the latest challenge to efforts aimed at dismantling the disaster-hit facility.

Radiation levels inside the plant’s No. 2 reactor were estimated at 530 sieverts per hour at one spot, Tokyo Electric Power Co (TEPCO) said Thursday after analyzing images taken by a manually operated camera that probed the deepest point yet within the reactor.

Even after taking a 30-percent margin of error into account, the radiation level was still far higher than the previous record of 73 sieverts per hour detected by sensors in 2012 though at a point not as deep, TEPCO said. Radiation exposure at 530 sieverts per hour would effectively shut down TEPCO’s planned robot camera probe in under two hours.

But TEPCO said the high reading focused on a single point, with levels estimated to be much lower at other spots filmed by the camera. It added that the planned robot probe would not sustain severe damage because it was unlikely to linger for too long at a single point.

The three cameras mounted on a caterpillar-type robot are designed to withstand up to 1,000 sieverts in total. TEPCO said the radiation is not leaking outside the reactor. A massive undersea earthquake on March 11, 2011 sent a huge tsunami barrelling into Japan’s northeast coast, leaving more than 18,000 people dead or missing, and sending three reactors into meltdown at the Fukushima plant in the worst such accident since Chernobyl in 1986.

Japan’s government said in December that it expects the total costs – including compensation, decommissioning and decontamination – to reach 21.5 trillion yen ($190 billion) in a process likely to take decades as high radiation levels have slowed operations.

TEPCO has said it plans to eventually use robots to locate the fuel debris as part of the decommissioning process.

Images of the wreckage inside the No. 2 reactor captured by the camera show that the metal grating under the pressure vessel which contained nuclear fuel has largely sunken in, causing a hole about one metre wide.

Black debris that could be melted fuel is also seen in the images. Fuel may have melted through the vessel and damaged the grating but the exact cause was not determined, TEPCO spokesman Tatsuhiro Yamagishi said Friday. “It may have been caused by nuclear fuel that would have melted and made a hole in the vessel, but it is only a hypothesis at this stage,” he told AFP.

“We believe the captured images offer very useful information, but we still need to investigate given that it is very difficult to assume the actual condition inside,” he said.


Radioactive fish from Fukushima nuclear plant found on west coast of US

Posted in 2016 with tags , , , , , , , , , , , , , , on December 19, 2016 by theboldcorsicanflame


NaturalNews – In recent weeks, two new landmarks were crossed in the ongoing, inexorable spread of radioactive material from the 2011 Fukushima disaster toward North America’s west coast.

In November, researchers from the Fukushima InFORM project detected the radioactive isotope Cesium-134 (Cs-134) in Canadian salmon.

Then on December 9, researchers from Woods Hole Oceanographic Institution detected Cs-134 in seawater samples taken at two beaches in Oregon.

Because Cs-134 has a half life of only two years, any occurrence of the isotope in the environment must have come from Fukushima.

In 2011, a major earthquake and tsunami triggered multiple meltdowns at Japan’s Fukushima Daiichi nuclear power plant.

Massive quantities of radioactive material spilled into the ocean, while further material ejected into the air also eventually found its way to sea. Since then, researchers have been tracking the progress of this “radioactive plume” as it is carried toward North America by ocean currents.


Crews ‘facing 100-year battle’ at Fukushima By David Mark, Mark Willacy

Posted in Uncategorized with tags , , , , , , , , , , , , , , , , , , on April 1, 2011 by theboldcorsicanflame


A nuclear expert has warned that it might be 100 years before melting fuel rods can be safely removed from Japan’s Fukushima nuclear plant.

The warning came as levels of radioactive iodine flushed into the sea near the plant spiked to a new high and the Wall Street Journal said it had obtained disaster response blueprints which said the plant’s operators were woefully unprepared for the scale of the disaster.

Japan Nuclear Accident/USA Calif : Eight of the EPA’s 18 West Coast monitors might not be working / Michael Collins : His stream is of live radiation monitoring in West LA

Posted in Uncategorized with tags , , , , , , , , , , , , , , , , , , , on March 26, 2011 by theboldcorsicanflame

Latest News about Japan on Climatevoices

Posted in Uncategorized with tags , , , , , , , , , , , , , on March 15, 2011 by theboldcorsicanflame