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TOKYO (Reuters) - Tokyo Electric Power Co, the operator of the tsunami-crippled Fukushima power plant, shut its last operating nuclear reactor on Monday for regular maintenance, leaving just one running reactor supplying Japan's creaking power sector. Japan has 54 reactors, but since the tsunami last March triggered the world's worst nuclear crisis in 25 years at the Fukushima plant, it has been unable to restart any reactors that have undergone maintenance due to public safety concerns. Tepco said it shutdown the No.6 reactor at its Kashiwazaki Kariwa plant, the world's biggest nuclear power plant, raising concerns about a power crunch this summer when electricity demand peaks due to hot weather.

TOKYO (Reuters) - Tokyo Electric Power Co, the operator of the tsunami-crippled Fukushima power plant, shut its last operating nuclear reactor on Monday for regular maintenance, leaving just one running reactor supplying Japan's creaking power sector. Japan has 54 reactors, but since the tsunami last March triggered the world's worst nuclear crisis in 25 years at the Fukushima plant, it has been unable to restart any reactors that have undergone maintenance due to public safety concerns. Tepco said it shutdown the No.6 reactor at its Kashiwazaki Kariwa plant, the world's biggest nuclear power plant, raising concerns about a power crunch this summer when electricity demand peaks due to hot weather.

TOKYO (Reuters) - Radioactive material released into the sea in the Fukushima nuclear power plant crisis is more than triple the amount estimated by plant operator Tokyo Electric Power Co, Japanese researchers say. Japan's biggest utility estimated around 4,720 trillion becquerels of cesium-137 and iodine-131 was released into the Pacific Ocean between March 21 and April 30, but researchers at the Japan Atomic Energy Agency (JAEA) put the amount 15,000 trillion becquerels, or terabecquerels.

Tatsuhiko Kodama began his 27 July testimony to Japan's parliament with what he knew. In a firm, clear voice, he said that the Radioisotope Center of the University of Tokyo, which he heads, had detected elevated radiation levels in the days following the meltdown of three reactors at the Fukushima Daiichi nuclear power station

By Shinichi Saoshiro TOKYO, Sept 1 (Reuters) - Tokyo Electric Power (Tepco) [More]

TOKYO (Reuters) - The operator of a crippled Japanese nuclear plant said on Wednesday it had experienced power outages at two of its reactors but it was able to continue the cooling process to bring them under control. Tokyo Electric Power Co (Tepco) said it was investigating the power outages at its No. 1 and No

Twenty-five years after the tragic runaway fission and fire at Chernobyl , tons of concrete shield workers and visitors from the dangerously radioactive puddle of melted fuel that lurks in the basement of the building housing reactor No. 4. Similarly, more than 30 years after the partial meltdown at Three Mile Island in Pennsylvania, concrete shaved 2.5 centimeters deep guards a hollow reactor vessel, its partially melted down fuel rods having been taken out over the course of a decade and shipped to Idaho National Laboratory (INL) for study

As northeastern Japan copes with Thursday's magnitude-7.1* aftershock, the largest since the disastrous March 11 magnitude-9.0 earthquake and tsunami , the injection of nitrogen gas into one of the crippled reactors at the Fukushima Daiichi nuclear power plant was interrupted as Tokyo Electric Power Company (TEPCo) workers evacuated to a safer site, according to the Japan Broadcasting Corp (JBP) . A tsunami warning had been issued briefly but was later canceled .

(Repeats to add PDF link) * Tokyo Electric ignored own study on tsunami risk * Utility decided safety issues, not regulators * Kept vulnerable vent systems despite quake data * Tokyo Electric cited the most for safety violations By Kevin Krolicki, Scott DiSavino and Taro Fuse TOKYO, March 29 (Reuters) - Over the past two weeks, Japanese government officials and Tokyo Electric Power executives have repeatedly described the deadly combination of the most powerful quake in Japan's history and the massive tsunami that followed as "soteigai," or beyond expectations. When Tokyo Electric President Masataka Shimizu apologized to the people of Japan for the continuing crisis at the Fukushima Daiichi nuclear plant he called the double disaster "marvels of nature that we have never experienced before." But a review of company and regulatory records shows that Japan and its largest utility repeatedly downplayed dangers and ignored warnings -- including a 2007 tsunami study from Tokyo Electric Power Co's senior safety engineer.

By Yoko Kubota TOKYO, March 25 (Reuters) - Injuries to workers battling to bring Japan's earthquake-damaged nuclear plant under control will set back efforts to stabilise it, officials said, as fear of radiation from the complex spread both at home and abroad. Engineers are trying to regain control of the six-reactor nuclear power station in Fukushima, 240 km (150 miles) north of the capital, two weeks after an earthquake and tsunami battered the plant and devastated northeastern Japan, leaving about 27,400 people dead or missing. Explosions in three reactors at the Fukushima Daiichi power station last week made this the world's worst nuclear crisis since Chernobyl and raised fears of a catastrophic meltdown

By Risa Maeda TOKYO, March 22 (Reuters) - Japan's economy may not feel the harshest blow from this month's disasters until summer, when surging power demand could spark a new round of power blackouts in Tokyo and its neighbouring prefectures which account for 40 percent of the country's GDP.

By Risa Maeda and Kazunori Takada TOKYO, March 22 (Reuters) - Rising temperatures around the core of one of the reactors at Japan's quake-crippled nuclear plant sparked new concern on Tuesday and more water was needed to cool it down, the plant's operator said. Despite hopes of progress in the world's worst nuclear crisis in a quarter of a century, triggered by an earthquake and tsunami that left at least 21,000 people dead or missing, plant operator Tokyo Electric Power Co (TEPCO) said it needed more time before it could say the reactors were stabilised. Technicians working inside an evacuation zone around the stricken plant on Japan's northeast Pacific coast, 250 km (150 miles) north of Tokyo, have attached power cables to all six reactors and started a pump at one to cool overheating nuclear fuel rods.

In the past few years, online crowdsourcing has emerged as an ultra-popular method of finding solutions to difficult problems such as infant mortality rates and out-of-control oil spills . Could crowdsourcing help Japan quell its nuclear disaster and help the country get back on its feet? The Global Innovation Commons , a repository of innovations that can be used because of patent expiration, abandonment, invalidity, or lack of in-country protection, has compiled a list of patent disclosures and open source technology that could be used as part of Japan's

Since a magnitude 9.0 earthquake rocked Japan and set loose a massive tsunami March 11, the Tokyo Electric Power Company (TEPCO) has been scrambling to avert a nuclear disaster at its hardest hit plant. The Fukushima Daiichi nuclear power station, home to six nuclear reactors, has witnessed explosions at three reactors and a fire in a spent-fuel pool at a fourth. At two reactors, units No.

As the situation at Japan's 40-year-old Fukushima Daiichi nuclear plant goes from bad to worse--four of the plant's six boiling water reactors have been damaged by explosions or fire and radiation has begun leaking into the atmosphere--officials there continue to pump the reactors with seawater in an attempt to cool down fuel rods and avoid a complete meltdown that could release radioactive fallout across much of country.