Tag Archives: Fukushima Dai-ichi nuclear-power plant

Where to Go? 1 Million Tons Radioactive Water at Fukushima

In August 2019, Tepco projected that storage of radioactive water at the Fukushima nuclear plant would reach full capacity by around summer 2022 even after the expansion — the first time it has issued such a precise estimate.  According to Tepco, the Fukushima No. 1 plant had 960 massive tanks containing 1.15 million tons of treated water as of July 18, 2019. Water that has touched the highly radioactive melted fuel debris has been cleaned up through water treatment machines and is stored in the tanks, but the high-tech treatment machines are able to remove most radionuclides except tritium. The plant currently sees an increase of contaminated water by 170 tons a day, Tepco says.

Releasing tritium-tainted water into the sea in a controlled manner is common practice at nuclear power plants around the world, and it was generally considered the most viable option as it could be done quickly and would cost the least.  The head of the Nuclear Regulation Authority, Toyoshi Fuketa, has long said that releasing the treated water into the sea is the most reasonable option, but people in Fukushima, especially fishermen, fear it will damage the region’s reputation.

Addressing those concerns, the government panel, launched in November 2016, has been looking for the best option in terms of guarding against reputational damage. Injecting it into the ground, discharging it as steam or hydrogen, or solidification followed by underground burial have all been on the table. Under the current plan, Tepco is set to increase the tank space to store 1.37 million tons of water a total, but estimates show that will only last until summer 2022.  But the more space it creates, the bigger the decommissioning headache becomes.

Excerpts from KAZUAKI NAGAT, Fukushima nuclear plant to run out of tanks to store tritium-laced water in three years, Tepco says, Japan Times, Aug. 9, 2019
BY KAZUAKI NAGATA

Never-Ending CleanUp: Fukushima

 The operator of Japan’s wrecked Fukushima nuclear plant completed in April 2019 the removal of the first fuel rods from a cooling pool high up in a badly damaged reactor building, a rare success in the often fraught battle to control the site.  The batch of 22 unused fuel assemblies, which each contain 50-70 of the fuel rods, was transferred by a trailer to a safer storage pool, the last day of a four-day operation, Tokyo Electric Power Co, or Tepco, said in a statement.

The company must carefully pluck more than 1,500 brittle and potentially damaged assemblies from the unstable reactor No.4., the early stages of a decommissioning process following the 2011 earthquake and tsunami that wrecked the site.

Tepco estimates removing the damaged assemblies from reactor No.4 alone will take a year. Some experts say that timeline is ambitious.  Still, it is an urgent operation. They are being stored 18 meters (59 feet) above ground level in a building that has buckled and tilted and could collapse if another quake strikes.  Carefully plucking the damaged fuel assemblies from the reactor building is being seen as a test of Tepco’s ability to move ahead with decommissioning the whole facility – a task likely to cost tens of billions of dollars and take decades.  The removal has to be conducted under water. If the rods are exposed to air or if they break, huge amounts of radioactive gases could be released into the atmosphere. Each assembly weighs around 300 kg (660 pounds) and is 4.5 meters (15 feet) long.  The hazardous removal operation has been likened by Arnie Gundersen, a veteran U.S. nuclear engineer and director of Fairewinds Energy Education, to trying to pull cigarettes from a crushed pack

Exerpts from In Start of Long Operation, Fukushima Removes First Fuel Rods, Reuters, April 2019

A Never-Ending Disaster: radioactive water at Fukushima

A Greenpeace report details how plans to discharge over 1 million tonnes of highly contaminated water into the Pacific Ocean was proposed by a Japanese government task force.  According to Greenpeace.

“The decision not to develop water processing technology that could remove radioactive tritium was motivated by short term cost cutting not protection of the Pacific ocean environment or the health and livelihoods of communities along the Fukushima coast,” said Kazue Suzuki, Energy Campaigner at Greenpeace Japan. “  The report concludes that the water crisis remains unresolved, and will be for the foreseeable future. The only viable option to protect the environment and the communities along the Fukushima coast being long term storage for the contaminated water.

The discharge option for water containing high levels of radioactive tritium was recommended as least cost by the Government’s Tritiated Water Task Force and promoted by Japan’s Nuclear Regulation Authority (NRA). The Task Force concluded in 2016 that “sea discharge would cost 3.4 billion yen (US$30 million) and take seven years and four months to complete. It concluded that this was cheapest and quickest of the five methods.” However, technical proposals for removing tritium were submitted to the same Government Task Force by multiple nuclear companies with estimated costs ranging from US$2-US$20 billion to US$50-US$180 billion depending on the technology used. These were dismissed as not viable but without detailed technical consideration.

TEPCO has claimed since 2013 that its ALPS technology would reduce radioactivity levels “to lower than the permissible level for discharge.” However, in September 2018 TEPCO admitted that the processing of over 800,000 tons of contaminated water in 1000 storage tanks, including strontium, had failed to remove radioactivity to below regulatory limits, including for strontium-90, a bone seeking radionuclide that causes cancer. TEPCO knew of the failure of the technology from 2013. The Greenpeace report details technical problems with the ALPS system.

The Fukushima Daiichi site, due its location, is subject to massive groundwater contamination which TEPCO has also failed to stop. Each week an additional 2-4000 tonnes of contaminated water is added to the storage tanks.

Excerpts from Technical failures increase risk of contaminated Fukushima water discharge into Pacific, Greenpeace Press Release,  Jan. 22, 2019

Devil’s Idea for Tokyo’s End: Fukushima

By late March 2011… after tsunami struck the Fukushima Daiichi plant—it was far from obvious that the accident was under control and the worst was over. Chief Cabinet Secretary Yukio Edano feared that radioactive material releases from the Fukushima Daiichi plant and its sister plant (Fukushima Daini) located some 12 km south could threaten the entire population of eastern Japan: “That was the devil’s scenario that was on my mind. Common sense dictated that, if that came to pass, then it was the end of Tokyo.”

Prime Minister Naoto Kan asked Dr. Shunsuke Kondo, then-chairman of the Japanese Atomic Energy Commission, to prepare a report on worst-case scenarios from the accidenta .  Dr. Kondo led a 3-day study involving other Japanese experts and submitted his report (Kondo, 2011) to the prime minister on March 25, 2011. The existence of the report was initially kept secret because of the frightening nature of the scenarios it described. An article in the Japan Times quoted a senior government official as saying, “The content [of the report] was so shocking that we decided to treat it as if it didn’t exist.” …

One of the scenarios involved a self-sustaining zirconium cladding fire in the Unit 4 spent fuel pool. Radioactive material releases from the fire were estimated to cause extensive contamination of a 50- to 70-km region around the Fukushima Daiichi plant with hotspots significant enough to require evacuations up to 110 km from the plant. Voluntary evacuations were envisioned out to 200 km because of elevated dose levels. If release from other spent fuel pools occurred, then contamination could extend as far as Tokyo,…There was particular concern that the zirconium cladding fire could produce enough heat to melt the stored fuel, allowing it to flow to the bottom of the pool, melt through the pool liner and concrete bottom, and flow into the reactor building.

Lessons Learned from the Fukushima Daiichi Accident for Spent Fuel Storage: The U.S. nuclear industry and its regulator should give additional attention to improving the ability of plant operators to measure real-time conditions in spent fuel pools and maintain adequate cooling of stored spent fuel during severe accidents and terrorist attacks. These improvements should include hardened and redundant physical surveillance systems (e.g., cameras), radiation monitors, pool temperature monitors, pool water-level monitors, and means to deliver pool makeup water or sprays even when physical access to the pools is limited by facility damage or high radiation levels….

[At nuclear power plants there must be…adequate separation of plant safety and  security systems so that security systems can continue to function independently if safety systems are damaged. In particular, security systems need to have independent, redundant, and protected power sources…]

Excerpts from Lessons Learned from the Fukushima Accident for Improving
Safety and Security of U.S. Nuclear Plants: Phase 2, US National Academies, 2016

Revival of Nuclear Industry – Japan

Japan prepares to  reopen Shikoku Electric Power’s Ikata nuclear plant, nestled next to Japan’s inland sea at the base of the verdant Sadamisaki peninsula. Nearly eight years after an earthquake and tsunami triggered nuclear meltdowns at Tokyo Electric Power’s Fukushima Daiichi plant, the battered industry is making a quiet and somewhat unexpected return in Japan.

Ikata is a poster child for that recovery. In September 2018, a court reversed a decision that had idled Shikoku Electric’s sole nuclear reactor for about a year, paving the way for the operator to re-open the facility last week.  Regional utilities like Shikoku Electric have aggressively fought a string of lawsuits since 2011, hiring veteran lawyers to beef up their legal teams. At the same time, they wooed towns where nuclear plants are based, visiting with residents door to door while the government kept up a stream of generous subsidies for local projects.

Thanks in large part to this strategy, Japan is on track to have nine reactors running in the near future…That is a far cry from the 54 running before 2011 – all of which were idled after the Fukushima disaster – but more than analysts and experts expected, considering it seemed at the time like the end of the road for the country’s nuclear industry…

The quiet revival of Japan’s nuclear industry is most tangible in rural areas like Ikata, which are home to the bulk of the country’s nuclear plants…The town, with 9,500 residents, relies on nuclear power for a third of its annual revenue. Since 1974, Ikata has received more than 101.7 billion yen ($908.4 million) in such payments.  These funds literally built the town; Ikata’s roads, schools, hospitals, fire stations and even five traditional “taiko” drums for festivals were all paid for with subsidies.  The town and utility’s mutual dependence stretch back decades.

Excerpts from  Mari Saito, Treading carefully, Japan’s nuclear industry makes a comeback, Reuters, Nov. 1, 2018

 

 

 

What to Do with Radioactive Pools

More than 60,000 tons of highly radioactive spent nuclear fuel is stored on the shores of four of the five Great Lakes at the Border between United States and Canada — in some cases, mere yards from the waterline — in still-growing stockpiles…It remains on the shorelines because there’s still nowhere else to put it…

The nuclear power industry and its federal regulator, the U.S. Nuclear Regulatory Commission, point to spent nuclear fuel’s safe on-site storage over decades. But the remote possibility of a worst-case scenario release — from a natural disaster, a major accident, or an act of terrorism — could cause unthinkable consequences for the Great Lakes region.   Scientific research has shown a radioactive cloud from a spent fuel pool fire would span hundreds of miles, and force the evacuation of millions of residents in Detroit, Chicago, Cleveland, Toronto or other population centers, depending on where the accident occurred and wind patterns.

For five years, Michigan residents, lawmakers, environmental groups and others around the Midwest have, loudly and nearly unanimously, opposed a planned Canadian underground repository for low-to-medium radioactive waste at Kincardine, Ontario, near the shores of Lake Huron. Meanwhile, spent nuclear fuel, vastly more radioactive, sits not far from the shores of  four Great Lakes — Michigan, Huron, Erie and Ontario — at 15 currently operating or former nuclear power plant sites on the U.S. side. In Michigan, that includes Fermi 2; the Donald C. Cook nuclear plant in Berrien County; the Palisades nuclear plant in Van Buren County, and the former Big Rock Point nuclear plant in Charlevoix County, which ceased operation in 1997 and where now only casks of spent nuclear fuel remain.

Neither the U.S. nor the Canadian government has constructed a central collection site for the spent nuclear fuel. It’s not just a problem in the Great Lakes region — more than 88,000 tons of spent nuclear fuel, an amount that is rising, is stored at 121 U.S. locations across 39 states.

Spent nuclear fuel isn’t only radioactive, it continues to generate heat. It requires storage in pools with circulating water for typically five years before it can be moved into so-called dry-cask storage — concrete-and-steel obelisks where spent fuel rods receive continued cooling by circulating air.In practice, however, because of the high costs associated with transferring waste from wet pools to dry casks, nuclear plants have kept decades worth of spent fuel in wet storage. Plant officials instead “re-rack” the pools, reconfiguring them to add more and more spent fuel, well beyond the capacities for which the pools were originally designed.

Only in recent years have nuclear plants stepped up the transition to dry cask storage because there’s no room left in the wet pools. Still, about two-thirds of on-site spent nuclear fuel remains in wet pools in the U.S….That’s a safety concern, critics contend. A catastrophe or act of terrorism that drains a spent fuel pool could cause rising temperatures that could eventually cause zirconium cladding — special brackets that hold the spent fuel rods in bundles — to catch fire.  Such a disaster could be worse than a meltdown in a nuclear reactor, as spent nuclear fuel is typically stored with nowhere near the fortified containment of a reactor core.

At Fukushima…what almost happened — at the plant’s Unit 4 spent-fuel pool that gives nuclear watchdogs nightmares.  A hydrogen explosion four days into the disaster left the building housing the Unit 4 spent-fuel pool in ruins. The pool was seven stories up in a crumbling, inaccessible building.  It “was so radioactive, you couldn’t put people up there,” von Hippel said. “For about a month after Fukushima, people didn’t know how much water was in the pool. They were shooting water up there haphazardly with a hose, trying to drop it by helicopter.”  Two weeks after the earthquake and tsunami, the Japanese Atomic Energy Commission secretly conducted a worst-case scenario study of the ongoing disaster. The biggest fear that emerged: that a self-sustaining fire would start in the Unit 4 spent fuel pool, spreading to the nearby, damaged reactors. That, they found, would release radiation requiring evacuations as far away as 150 miles, to the outskirts of Tokyo and its more than 13.4 million residents. “That was the devil’s scenario that was on my mind,” Chief Cabinet Secretary Yukio Edano said during a special commission’s 2014 investigation of the accident.“Common sense dictated that, if that came to pass, then it was the end of Tokyo.”   What kept the spent fuel rods covered with water in Unit 4 was a miraculous twist of fate: The explosion had jarred open a gate that typically separated the Unit 4 spent fuel pool from an adjacent reactor pool.  “Leakage through the gate seals was essential for keeping the fuel in the Unit 4 pool covered with water,” a 2016 report on the Fukushima accident by the U.S. National Academies of Sciences, Engineering and Medicine concluded. “Had there been no water in the reactor well, there could well have been severe damage to the stored fuel and substantial releases of radioactive material to the environment.”

The U.S. nuclear industry sees Fukushima differently — in some ways as a success story.  “At Fukushima, you not only had a tsunami, you blew up the buildings … and you still did not drain the pool,” said Rod McCullum, senior director for fuel and decommissioning at the Nuclear Energy Institute, the trade association for nuclear utilities in the U.S.  “Those pools and those casks withstood explosions and earthquakes and tsunamis, all on the same day.”  A scenario where a fire can occur by the draining of water from a spent-fuel pool “has never been demonstrated,” McCullum said. He noted safety measures added in the U.S. since Fukushima include the ability to provide extra pumps and water supplies, in minutes or hours, should a spent fuel pool become breached and lose water — even if the disaster required that the resources be brought in by air from farther away….

Because nuclear power is much more widely used in Canada — the province of Ontario alone has 20 nuclear reactors at three plants — it also generates much more nuclear waste.  In Ontario, nearly 52,000 tons of spent nuclear fuel is stored on-site at nuclear plants along Lakes Huron and Ontario.“There’s a huge amount of high-level, radioactive waste stored right along the water,” said Edwards, the president of the nonprofit Canadian Coalition for Nuclear Responsibility  Like the U.S., Canada is seeking a long-term storage solution that will involve a central underground repository. Unlike the U.S., the Canadian government is seeking willing hosts, promising jobs and economic activity. …Even if a central repository is one day approved, another complication arises — how to get two generations of the most dangerous industrial waste man has ever created from sites all over the country to one point….

Germany, in the 1980s, tried using an abandoned salt and potash mine to store barrels of nuclear waste over 30 years, the Asse II mine.  It’s now prompting a cleanup that may take 30 years and cost nearly $12 billion U.S. dollars. The government has disputed the contention of workers at the mine that they were exposed to excessive levels of radiation, causing an unusual number of cancers….Nuclear power is projected to drop as a percentage of the world’s power generation mix from 10 percent in 2017 to just 5.6 percent by 2050, a report issued by the International Atomic Energy Agency this summer found…

If central repository solutions aren’t found, within years, the re-licensing of some early dry-cask storage facilities will come into play, as they meet a lifespan they were never expected to reach. “The age of nuclear power is winding down, but the age of nuclear waste is just beginning,” Edwards said.

Excerpts from Keith Matheny, 60,000 tons of dangerous radioactive waste sits on Great Lakes shores, Detroit Free Press, Oct. 19, 2018

Dismantling Nuclear Reactors at Fukushima

In the aftermath of the Fukushima nuclear disaster in 2011, Naraha decided to oppose nuclear energy and call for the closure of the Fukushima No. 2 nuclear power plant that it co-hosts on the coast of the prefecture.  Since the 1970s, the town has been home to the No. 2 plant, which first went into service in 1982.  For decades, Naraha has received central government grants and subsidies for hosting the No. 2 plant, as well as tax revenues from TEPCO and its affiliates operating in the town.The plant also employed 860 people, many of them from Naraha and its surrounding communities.

Naraha had a population of about 8,000 before the Great East Japan Earthquake and tsunami caused the triple meltdown at TEPCO’s Fukushima No. 1 nuclear plant in March 2011. The crippled plant is located within 20 kilometers from Nahara.  The quake and tsunami also created a scare at the No. 2 plant by leaving the facility with only a limited power supply from external sources and emergency diesel generators to cool the reactors. But the plant brought the situation under control.

After long remaining silent about the fate of the No. 2 plant, TEPCO decided to retire all of its four reactors, which were approaching their legal operating limit of 40 years. If the power company wanted to continue operations at the plant, it would have to spend hundreds of billions of yen on upgrades to meet the more stringent safety standards that were set after the accident at the No. 1 plant…

Although Naraha and Tomioka officials share concerns about their municipalities’ financial futures, they see a silver lining in the situation at the Fukushima No. 1 nuclear plant.  Both towns have served as front-line bases for workers involved in decommissioning of the stricken plant.  About 5,000 workers a day who are involved in the decommissioning effort provide steady business for convenience stores and other shops in the two towns. Business hotels, dorms and apartment buildings have been built in the towns and neighboring communities to accommodate the workers. Work to dismantle the No. 1 plant is expected to take decades to complete. Local officials said the closure of the No. 2 plant could bring about a similar economic boon. “Decommissioning can become a major industry,” Naraha Mayor Matsumoto said.

Excerpts from  Nuclear plant closure brings hope, despair to Fukushima town
THE ASAHI SHIMBUN, October 18, 2018