FUKUSHIMA (Jiji Press) — The new leaders of Tokyo Electric Power Company Holdings Inc. told Fukushima Gov. Masao Uchibori on Monday of their resolve to promote the decommissioning of the company’s disaster-crippled Fukushima No. 1 nuclear power plant.
“There is no change at all that Fukushima is our basic focus,” TEPCO Chairman Takashi Kawamura said to Uchibori at a meeting in the prefectural government office, after explaining that TEPCO’s new management team was launched after approval at a general meeting of its shareholders on Friday.
Kawamura said, “We will proceed safely and steadily with the decommissioning work for the Fukushima No. 1 plant,” where a serious nuclear accident occurred after the March 2011 major earthquake and tsunami in northeastern Japan. The prefecture hosts the plant.
Meanwhile, Uchibori said the people of Fukushima Prefecture strongly want all reactors at TEPCO’s Fukushima No. 2 nuclear power plant, also located in the prefecture, to be decommissioned, the same as they want the decommissioning of the Fukushima No. 1 plant and the implementation of accident compensation plans.
Since the 2011 disaster, TEPCO has halted all four reactors at the No. 2 plant. The Fukushima prefectural assembly and the assemblies of all 59 municipalities in Fukushima have adopted resolutions calling on the company to decommission the No. 2 plant or taken similar steps.
Swimming robot ‘little sunfish’ to inspect crippled Fukushima plant
Japan has unveiled a small swimming robot that will inspect the damage at the crippled Fukushima nuclear power plant. The device weights 2kg, is 13cm in diameter and will be able to swim deep into the melted reactor, its developers say.
The Japan-based International Research Institute for Nuclear Decommissioning (IRID) unveiled the robot, dubbed ‘mini manbo’ (little sunfish) in the media, together with Toshiba group on Thursday.
The robot “is small enough and resilient enough to enter and inspect the damaged primary containment vessel [PCV] of Fukushima Daiichi Nuclear Power Station Unit 3,” a statement from the IRID said, adding that the device will be deployed this summer.
The device is equipped with two cameras and can be remotely controlled via a wire, while operators can record its progress through the coolant. ‘Little sunfish’ will deliver a video feed that “will clarify damage to the PCV interior and information on how best to retrieve fuel debris,” the IRID added.
The major advantage of the robot is that it “can avoid various obstacles,” Tsutomu Takeuchi, a senior manager at the nuclear energy division of Toshiba, told AP. The company is tasked with helping to clean up the damaged plant.
The device was created for inspection of the primary containment vessel (PCV) of Unit 3 of the crippled plant. Unit 3 was flooded with coolant to a depth of about 6 meters (20ft) and in order to make a proper clean-up, such a coolant must be located and mapped, according to the IRID.
“The penetration hole giving access to the PCV is only 14cm in diameter, limiting the size of any robot that can be deployed,” the IRID added.
Thus, the newly-presented robot seems ideal for the job.
The robot’s radiation resistance is approximately 200 Sievert (Sv), according to its characteristics. For comparison, an exposure of about 1 sievert can cause biological damage to living tissue, according to the International Atomic Energy Agency (IAEA).
“Scientists developed ‘mini manbo’ with the aim of operating in a highly radioactive environment,” Goro Yanase, general manager of Toshiba’s Nuclear Energy Systems & Services Division, said.
“We succeeded in developing a small robot with high-level radiation resistance, and through its deployment we expect to get information that will support the advance of decommissioning,” he added.
The Fukushima Daiichi nuclear power plant suffered a blackout and subsequent failure of its cooling systems in March 2011, when it was struck by an earthquake and tsunami. Three of the plant’s six reactors were hit by meltdowns, making the disaster the worst since the Chernobyl catastrophe in the USSR in 1986.
Japanese authorities have repeatedly sent robots to inspect the contained area of the crippled plant but the devices either broke down or the missions were aborted. In February, such an attempt ended in failure as a clean-up robot stopped working two hours after it was sent to the inactive Reactor 2 at the nuclear complex.
Following the failure, Naohiro Masuda, president of Fukushima Daiichi Decommissioning, said that more creativity was needed to produce robots that can find and assess the condition of melted fuel rods at the high-level radiation site.
Toshiba unveils submersible video robot to probe reactor 3 at Fukushima No. 1 plant
YOKOSUKA, KANAGAWA PREF. – Toshiba Corp. unveiled on Thursday a submersible robot to take live video of reactor 3 at the Fukushima No. 1 power plant to confirm whether fuel debris is sitting at the bottom of a pool of radioactive water inside.
The location and condition of the fuel in the three reactors hit by core meltdowns is critical information for Tokyo Electric Power Company Holdings Inc., which runs the plant. Removing the fuel debris is considered the most difficult part of decommissioning the complex.
Unit 3 has the highest level of water inside at 6 meters. The fuel debris inside is presumed to have melted through its pressure vessel and settled at the bottom of its primary containment vessel.
“Until today, no one has seen the situation inside reactor 3,” said Tsutomu Takeuchi, senior manager at Toshiba’s Fukushima Restoration and Fuel Cycle Project Engineering Department.
“If we can observe the situation inside the reactor, that would be a huge leap in our ongoing effort to extract the debris” and eventually shut down the wrecked plant, he said during a demonstration of the robot at the Port and Airport Research Institute in Yokosuka, Kanagawa Prefecture.
Co-developed with the International Research Institute for Nuclear Decommissioning, the cylindrical 30-cm robot, dubbed the “mini manbo” (miniature sunfish), has a camera that can move 180 degrees vertically on its front and a fixed camera on its rear, allowing it to crawl through the water while capturing images.
Tepco plans to send the remotely controlled robot into the reactor as early as mid-July. A camera inserted into the reactor in October 2015 was unable to reach the bottom of the containment vessel.
No probe has been able to confirm the location or condition of the nuclear debris in any of the three crippled reactors.
Tepco sent a scorpion-shaped robot developed by Toshiba and the institute into reactor 2 in February, but it broke down before reaching its target under the pressure vessel after a tire got stuck.
In March, Tepco’s five-day robot-based investigation failed to capture an image of what was thought to be fuel debris in reactor 1.
A separate Tepco probe in January found black lumps in reactor 2’s pressure vessel but couldn’t immediately confirm they were fuel.
In December, the government estimated that the total cost of the Fukushima disaster would reach ¥21.5 trillion, including ¥8 trillion for decommissioning. That was almost doubled the initial estimate of ¥11 trillion.
Takeuchi of Toshiba did not reveal how much it cost to develop mini manbo.
Tsutomu Takeuchi, senior manager at Toshiba’s Fukushima Restoration and Fuel Cycle Project Engineering Department, shows off a robot it claims can probe water-filled reactor 3 at the defunct Fukushima No. 1 nuclear plant.
Swimming and wriggling robots unveiled for Fukushima clean-up
University and industry scientists have demonstrated new robots specialised for moving through and searching scenes of destruction that are impossible or dangerous for humans to enter.
Hardy, agile, remote-controlled robots will be vital for the decommissioning of power plants, particularly in the case of the Fukushima Daiichi Nuclear Power Plant, which suffered a meltdown in 2011 following a devastating tsunami and earthquake.
Robots can spend hours or days in environments so highly radioactive that a human worker would be killed in seconds.
The Japanese government hopes to start the challenging task of removing hundreds of tonnes of melted fuel after the Tokyo 2020 Olympics, potentially beginning work in 2021. For this to be possible, engineers need to know the exact location of the fuel, and understand the extent of the structural damage to the reactors.
Among other efforts, a snake-like robot was used in 2011 to explore the reactors, but was trapped repeatedly by obstacles and its camera was blocked. A “scorpion” inspired crawling robot also failed to navigate the site and was abandoned inside.
Years later, a new version of the snake-like robot has been revealed by Japanese scientists, including a team from Tohoku University in Sendai: a region severely affected by the tsunami and earthquake.
The robot stretches to eight metres in length, has a camera attached to the front and can move at speeds of up to 10cm per second.
It wriggles in a serpentine motion, propelled by the vibrations of the brush-like hairs that cover its body. Unlike any other robot, it can also “rear” its tip like the head of a snake, shooting a small jet of air to lift it. This allows it to climb over obstacles – such as debris in a disaster zone – up to 20cm in height.
According to Professor Satoshi Tadokoro of Tohoku University, the robot could search for people trapped in collapsed homes following earthquakes, and test the structural safety of damaged buildings. The researchers hope to have it ready to assist in search and rescue operations and other tasks within three years of durability testing.
Meanwhile, an alternative disaster relief robot has been unveiled by Toshiba and the public International Research Institute for Nuclear Decommissioning. This swimming robot is the size of a loaf of bread is and fitted with lights, camera and tail propellers.
It is designed specifically to inspect meltdown damage at the Fukushima nuclear plant, and will enter the primary containment vessel of Fukushima’s Unit 3 this summer to locate melted fuel in radioactive water.
The incoming president of Tokyo Electric Power Company Holdings Inc. has expressed eagerness to accelerate moves for tie-ups with other companies in an effort to revive its business following the meltdowns at its Fukushima No. 1 nuclear complex in 2011.
“Capital strength is important to seriously embark on growth businesses,” Tomoaki Kobayakawa, the head of Tokyo Energy Partner Inc., Tepco’s electricity retail arm, said in a recent interview. The 53-year-old is set to assume the post of president on June 23.
His remarks were in line with Tepco’s new business turnaround plan announced on March 22, in which it said it aims to realign and integrate its nuclear and power transmission and distribution businesses with other utilities to improve profitability.
The company, burdened with massive costs stemming from the Fukushima disaster, was placed under effective state control in exchange for a ¥1 trillion ($9 billion) capital injection in 2012.
Compensation and disaster cleanup costs have continued to rise, with the latest estimate reaching ¥22 trillion — twice the sum expected earlier.
Kobayakawa said JERA Co., a joint venture of a Tepco unit and Chubu Electric Power Co. in the area of coal power generation, is a “good example” of a tie-up, as enlarged capital has allowed it “to move powerfully.”
He said the power transmission and distribution businesses will also “produce outcomes if we can (align with other companies) and cover a wide network.”
“I want to make more and more proposals,” he said, pointing to the possibility of forming alliances with businesses overseas, given that domestic demand for electricity is on the decline.
On the resumption of nuclear power generation, Kobayakawa expressed his intention to respect the view of local municipalities in restarting reactors 6 and 7 at the Kashiwazaki-Kariwa plant in Niigata Prefecture on the Sea of Japan coast.
Masahiro Sakurai, the mayor of Kashiwazaki, the city that hosts the nuclear plant along with the neighboring town of Kariwa, has said that the decommissioning of one of reactors 1 to 5 at the Kashiwazaki-Kariwa plant would be a condition for the restart of reactors 6 and 7.
“I haven’t met (the mayor) in person. I would like to confirm his intention,” Kobayakawa said.
Kobayakawa also reiterated the company’s position that it will decide “comprehensively” on whether the Fukushima No. 2 nuclear power plant, located around 12 km south of the crippled Fukushima No. 1, would be scrapped as the prefectural government has urged the decommissioning of the plant.
Tokyo Electric Power Company Holdings Inc. (TEPCO) has informally decided to decommission the No. 1 reactor at its Fukushima No. 2 Nuclear Power Plant, it has been learned.
In the wake of the March 2011 Great East Japan Earthquake and tsunami and ensuing meltdowns at the Fukushima No. 1 plant in Fukushima Prefecture, local bodies and residents of the area who suffered extensive damage requested that all four reactors at the No. 2 plant also be decommissioned.
TEPCO had avoided stating a clear position on the No. 2 plant’s reactors, but there had been pressure from the government and ruling coalition for it to make a decision. The company accordingly decided to decommission the plant’s No. 1 reactor, which suffered the most damage, and will consider what to do with the other three reactors in the future.
The No. 1 reactor of the Fukushima No. 2 plant began operating in 1982. It was flooded by tsunami on March 11, 2011, and all four reactors at the plant remain idled. The No. 2 plant suffered less damage than the No. 1 plant, and if it passed screening by the Nuclear Regulation Authority, its reactors could be restarted. But the Fukushima Prefectural Government and all 59 local assemblies have asked TEPCO and the government to decommission all reactors in the prefecture.
TEPCO has remained busy handling compensation claims relating to the Fukushima nuclear disaster and the disaster cleanup. If it were to decommission all of the No. 2 plant’s reactors, they would lose value and it would have to write down huge losses. Company president Naomi Hirose has therefore avoided taking a clear position on the issue, saying, “I would like to consider it and make a decision as a business operator.”
Last year, however, officials decided to create a fund to cover the huge cost of handling the nuclear disaster, which is expected to reach 21.5 trillion yen, nearly double the original prediction. There was accordingly pressure from the government for TEPCO to reach an early decision on the fate of the No. 2 plant’s reactors.
The No. 1 reactor at the No. 2 plant is the oldest of the plant’s four reactors. It temporarily lost its cooling functions in the March 2011 disaster, and suffered the most damage among the four reactors. TEPCO believes that by limiting decommissioning to one reactor for the time being, it will be able to hold the decommissioning cost below 100 billion yen, minimizing the impact on company finances and on decommissioning work at the Fukushima No. 1 plant. However, a decision to decommission only one reactor at the No. 2 plant is unlikely to win public approval.
Tokyo Electric Power : Tepco denies it plans to scrap reactor at plant close to crippled Fukushima site
TOKYO (Reuters) – Tokyo Electric Power Co Holdings on Friday denied a media report that it was set to decommission a nuclear reactor that suffered only minor damage compared with the nearby Fukushima Daiichi plant that was wrecked after a massive quake in 2011.
The Mainichi newspaper reported earlier that Tepco was likely to decommission the No.1 reactor at the Fukushima Daini power plant as it was the worst-hit of the facility’s four reactors after the quake and tsunami, temporarily losing cooling functions.
Local governments have been calling for the decommission of all four reactors at Fukushima Daini. The government and the ruling Liberal Democratic Party have also pressed Tepco to make a decision on decommissioning the No.1 reactor.
Dozens of reactors elsewhere in Japan are still going through a relicensing process by a new regulator set up after the Fukushima disaster in 2011, the world’s worst since Chernobyl 25 years previously, highlighted regulatory and operational failings by the country’s nuclear utilities.
Workers at the Fukushima No. 1 and No. 2 nuclear power plants have faced prolonged periods of stress after suffering slander and discrimination in the six years since the triple reactor meltdown at the No. 1 plant in March 2011, a university survey has found.
Over 10 percent of workers at the plants were slandered or discriminated against after the calamity, and many continue to suffer from post-traumatic stress disorder, including flashbacks and sleep disorders, the survey found.
The survey covered 1,417 employees for Tokyo Electric Power Company Holdings Inc. who worked at the No. 1 and No. 2 plants at the time of the disaster.
Of them, 181 people, or 12.8 percent, were slandered or suffered discrimination, according to the survey, which was conducted by a team that included Takeshi Tanigawa, a professor at Juntendo University’s Graduate School of Medicine in Tokyo’s Bunkyo Ward.
Just after the nuclear crisis erupted, the workers had a rate of post-traumatic stress disorder 5.7 times higher than other Tepco employees. Even three years later, the rate remained 3.7 times higher.
Taniguchi said anger at Tepco should not be directed at its employees, since they are also part of the reconstruction effort in the Tohoku region. The government, he added, should also support efforts to protect the physical and mental health of Tepco workers involved in the reactors’ decommissioning.