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Japan

Until the Fukushima accident, Japan had 55 operating nuclear reactors as well as enrichment and reprocessing plants which had suffered a series of deadly accidents at its nuclear facilities resulting in the deaths of workers and releases of radioactivity into the environment and surrounding communities. Since the Fukushima disaster, there is growing opposition against re-opening those reactors closed for maintenance.

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Entries by admin (479)

Monday
Jan152018

Abe snubs head of Nobel-winning no-nukes group

Sunday
Nov192017

76 months after Fukushima nuclear catastrophe began, TEPCO located melted core

As reported by Martin Fackler in the New York Times, it took a "divine [robot] mission" to begin to locate the melted down core of the Unit 3 reactor (the one that suffered the worst explosion) at Tokyo Electric Power Company's (TEPCO) Fukushima Daiichi nuclear power plant in Japan.

This came after multiple failed robot missions in the past, often a result of robots getting stuck in debris, and their electronics fried by intense radioactivity levels measuring as high as 7,000 Rems per hour (exposure to 1,000 Rems would kill most humans exposed to it in a short period of time).

TEPCO and the Japanese government hope the location, at long last, of the melted cores will mark a turning point in the effort to transition from nuclear emergency response, to radiological cleanup. However, even they admit the decommissioning process will take many decades, at a cost of tens of billions of dollars.

This may be quite optimistic. Recent economic analyses have predicted a total, full cost accounting price tag for Fukushima nuclear catastrophe recovery of more than $600 billion (yes, with a B), three times what TEPCO and the Japanese Prime Minister Shinzo Abe's administration have admitted.

And of course, this assumes nothing more will go badly.

Other shoes that could still drop at Fukushima Daiichi include highly radioactive irradiated nuclear fuel, still stored in damaged reactor unit pools, that are years away from removal to a safer location. A pool fire that was narrowly dodged (through sheer luck) at Unit 4 in March-April 2011 could have led to the evacuation of 35-50 million people from metro Tokyo and northeast Japan, according to the then-serving Japanese Prime Minister, Naoto Kan. He has said such an event would have amounted to the end of the State of Japan.

Also, more than 800,000 tons of highly contaminated radioactive wastewater are stored in more than a thousand shoddy tanks across the site (see photo, above left). An earthquake, for example, could damage the tanks, leading to a massive release of contamination into the ground, groundwater, ditches, and trenches, all of which lead to the Pacific Ocean, a very short distance downhill.

Friday
Nov172017

GE faces federal lawsuit over Fukushima nuclear disaster

As reported by the Boston Business Journal, Japanese survivors of the ongoing Fukushima Daiichi nuclear catastrophe have filed suit against General Electric. They are seeking $500 million in damages.

As Arnie Gundersen, chief engineer at Fairewinds Energy Education, reported at the March 11, 2013 Helen Caldicott event in New York City marking the second anniversary of the beginning of the nuclear catastrophe, reactor vendor General Electric and subcontractor EBASCO in the United States bear major responsibility for the disaster. GE's Mark I Boiling Water Reactor design was and is a disaster waiting to happen, due to its too small, too weak containment structure. Many tens of feet of land elevation at Fukushima Daiiichi were removed, to bring the reactors closer to the ocean, for less expensive cooling water supply (but the seaside pumps were wiped out by the March 11, 2011 tsunami, which then swamped the site).

$500 million in damages may sound like a lot to many people. But consider that some economic analysts have predicted that the full cost accounting recovery from Fukushima Daiichi could surmount $600 billion (with a B -- three orders of magnitude higher than $500 million!).

Thursday
Sep282017

Fukushima’s decommissioning delays, challenges and unknowns remain roadblocks to cleanup

Six and a half years after the Fukushima Daiichi triple meltdown, Japan’s government, the nuclear regulator and Tokyo Electric Power Company’s (TEPCO) most rudimentary plan of attack for recovery from radioactive catastrophe is delayed again. The first steps of decommissioning cannot legitimately begin until undamaged but highly radioactive “spent” fuel assemblies are removed from vulnerable reactor storage ponds, sufficiently cooled and re-contained in qualified dry storage casks.  Then, there are the three melted fuel cores that still must be located, retrieved and somehow re-contained. Where all of the massive radioactive contamination will go is a mystery.  In fact, there are an alarming number of challenges, continuing delays and unknowns that remain before securing the destroyed nuclear power station site and halting the ongoing release of radioactivity to the land, water and air.

Among the most immediate concerns is the management of 1007 highly radioactive and thermally hot irradiated nuclear fuel assemblies still in the two cooling pools perched atop the destroyed Units 1 and 2 outside of any containment structure. Each of the site’s six-units has an elevated nuclear waste storage pond. The site has a large common pool located near Unit 4. The government recently admitted that previously unknown, possibly undisclosed, damage in these irradiated fuel storage ponds and radioactive contamination has again delayed the plan to move the dangerous fuel assemblies by at least another three years, now 2023. Unit 3 remains on schedule in 2018 to begin the two-year transfer of 514 irradiated fuel assemblies from its rooftop storage pool to a jam-packed common onsite pool located at ground level. This common pool and its massive radioactive inventory requires reliable cooling power.  Unit 4 completed a three-year project to transfer its irradiated fuel into the common pool in 2014. The common pool now has 6,726 irrradiated fuel assemblies with a maximum design capacity of 6,840. As this common pool is already densely packed, it is ever more critical that Japan expedite the transfer of the sufficiently cooled irradiated nuclear fuel into qualified, individualized dry storage casks that can passively cool the hot nuclear waste without the need for water and electrical power. Currently, only 1,412 irradiated assemblies have been secured in onsite dry cask storage. These dry casks further need to be hardened against another natural disaster and possible terrorism. 

The recurring delays at securing the irradiated fuel currently in wet pool storage (individual units to the common pool) and then into scientifically-qualified and hardened dry cask storage systems raises concern for public health, safety and the environment given the prospect of another large nearby earthquake causing a loss of cooling with the risk of a nuclear waste fire and radioactive releases. A 6.9 magnitude offshore earthquake on November 21, 2016 caused a temporary loss of cooling to wet storage systems at Fukushima Daiichi. Significant earthquakes of 6.0 to 6.9 magnitude occur in Japan on average 17 times per year, roughly one-tenth of all large earthquakes in the world. More severe earthquakes must be anticipated. The loss of cooling power and water to some or all of the more than 11,577 hot nuclear waste assemblies onsite outside of containment remains a significant public health, safety and environmental concern.

Japan is still technologically conceptualizing the “most challenging part” of Fukushima Daiichi’s decommissioning and the recovery of three missing melted reactor cores if and when they can be located. The unprecedented operation has now been delayed until 2019.  A viable technology for scooping up melted nuclear fuel does not yet exist. Re-containment and removal of the melted fuel cores is key to addressing the ongoing massive buildup of radioactive water now estimated at 800,000 tons that is being stored in growing onsite tank farms.  Groundwater flowing down into the reactor wreckage must be constantly pumped out, partially filtered of radioactivity and stored onsite in the large tanks. The tank farms themselves represent an additional environmental threat in the event of another severe earthquake that could rupture the structures with a radioactive flood into the ocean.  

Wednesday
Jul262017

Beyond Nuclear on Thom Hartmann: Is Fukushima still melting down?

Beyond Nuclear's Kevin Kamps appeared on Thom Hartmann's "The Big Picture" to discuss the discovery, 6.5 years later, of melted core at Fukushima Daiichi Unit 3, as well as Tokyo Electric Power Company's threat to simply release 770,000 metric tons (around 200 million gallons) of very highly tritium-contaminated wastewater directly into the Pacific Ocean.