March 23, 2011 |
[Update 12:47 a.m.] Tokyo's utility company says black smoke has been seen emerging from Unit 3 of the crippled nuclear plant in northeastern Japan, prompting a new evacuation of the complex. Officials with Tokyo Electric Power Co. said Wednesday that workers from the entire Fukushima Dai-ichi plant have been temporarily evacuated. _________________ Control room lights were on and electronic thermometers were functioning Wednesday at several of Japan's stricken nuclear reactors, marking small but potentially critical steps toward controlling overheated fuel that has been spewing radiation for more than a week.
March 14, 2011 |
The fuel rods at a third nuclear reactor at the Fukushima No. 1 nuclear power plant have been fully exposed to air for short periods of time and at least partially exposed for more than three hours, allowing them to heat up and sharply raising the risk of a meltdown, according to officials of the Tokyo Electric Power Co., which owns the plant. The cooling problems at reactor No. 2 represent the most serious development in the ongoing problems at the nuclear power plant to date, according to nuclear specialist Edwin Lyman of the Union of Concerned Scientists.
April 12, 2011 |
Japanese nuclear regulatory officials Tuesday raised the severity rating at the earthquake- and tsunami-damaged Fukushima Daiichi power plant to the highest level by international standards, equaling the 1986 Chernobyl meltdown in the former Soviet Union. The country's Nuclear and Industrial Safety Agency announced that because of the amount of radioactive material released from the plant after the magnitude 9 earthquake a month ago, the rating would be changed to level 7, a "major accident" on the International Atomic Energy Agency's scale, up from a level 5, an "accident with wider consequences.
March 25, 2011 |
As Japan marked two weeks since the giant earthquake and tsunami, the number of people dead or missing grew to more than 27,000, with at least 200,000 others in shelters and radioactivity from a stricken nuclear plant continuing to cast a pall over daily life. Two workers at the hobbled Fukushima Daiichi nuclear facility were hospitalized for radiation exposure Thursday after stepping into contaminated water during repair operations at reactor No. 3, officials at the nation's nuclear safety agency said.
March 27, 2011 |
For the better part of Sunday, media outlets in Japan and around the world carried scary-sounding news about radiation at the stricken Fukushima nuclear plant's No. 2 reactor. In a typical report, Japanese broadcaster NHK said: "Power company says it has detected radioactive materials 10 million times normal levels. " After nightfall came the mea culpa. There was a "mistake in the measurement of the assessment" of radiation in a building near the reactor, Tokyo Electric Power Co. said on its website.
March 18, 2011 |
Fighting exhaustion and radiation fears, engineers struggled anew Saturday to complete the crucial task of hooking up a damaged nuclear plant to the electricity grid to help cool damaged reactors. The official count of dead and missing in the quake and tsunami soared above 17,000, making this Japan's worst disaster since World War II. In the earthquake zone, tears trickled down the cheeks of some survivors and rescue workers as a solemn moment of silence was observed at 2:46 p.m. Friday, marking a week since the magnitude 9 temblor slammed Japan's northeastern coast.
March 16, 2011 |
A new power line that could restore the electric cooling systems at Japan's Fukushima Daiichi nuclear plant is nearing completion, its operator said Thursday, as international concern mounted over the crisis. FOR THE RECORD: Atomic agency official: An earlier version of the article incorrectly spelled the first name of Yukiya Amano, chief of the International Atomic Energy Agency, as Yukio. The new line to the nuclear complex, 150 miles north of Tokyo, would revive electric-powered pumps, allowing officials to maintain a steady water supply to troubled reactors and spent fuel pools, Tokyo Electric Power Co. spokesman Naoki Tsunoda was quoted as saying by the Associated Press.
March 15, 2011 |
? Dangerous levels of radiation escaped a quake-stricken nuclear power plant after one reactor's steel containment structure was apparently breached by an explosion, and a different reactor building in the same complex caught fire after another explosion, Japan's leaders told a frightened population. Authorities warned that people within 20 miles of the crippled reactors should stay indoors to avoid being sickened by radiation. FOR THE RECORD: An earlier version of this story incorrectly spelled the first name of Japanese Prime Minister Naoto Kan as Naoko.
March 21, 2011 |
Although officials of the U.S. Nuclear Regulatory Commission said Monday that conditions at the Fukushima Daiichi nuclear power plant appear to have stabilized and that the containment vessels at three reactors had not been seriously breached, smoke was reported rising from two reactors Monday evening. The cause of the smoke was unknown, however, and it did not appear to be associated with a radiation spike. The executive director of the NRC, Bill Borchardt, said Monday that the agency's staff in Japan reported that the three reactors that had shut down following the magnitude 9.0 Tohoku earthquake 10 days ago probably have suffered some core damage but do not appear to be leaking significant quantities of radiation.
March 18, 2011 |
Engineers at the Fukushima Daiichi nuclear power plant worked all day Friday attempting to connect a newly restored power line to reactors No. 1 and 2, but their task was repeatedly interrupted by the need to withdraw workers because of high radiation levels. The team said they hoped the task would be completed sometime Friday evening or in the early morning hours Saturday. It is not clear yet, however, whether restoring power to the two damaged reactors will help with cooling. Some engineers believe the cooling pumps were irretrievably damaged by the hydrogen explosions that wracked the reactor buildings in the first four days after the March 10 magnitude 9 Tohoku quake, or by corrosion from the seawater that has been pumped into the reactor.