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 22, 2011 |
Radiation has been detected in seawater in areas surrounding the earthquake and tsunami-ravaged Fukushima nuclear plant in northeastern Japan, creating one more cause for concern after radiation was found in food items and tap water. Officials stressed that the levels -- which they said would have minuscule impact on the human body even if the seawater were ingested daily over a year -- were not cause for alarm. Tokyo Electric Power Company, which owns the plant, said it detected radioactive iodine-131 more than 125 times higher than the legal limit in a sample of ocean water found about 0.2 miles south of the Fukushima Daiichi plant on Monday, Kyodo News Agency reported.
March 12, 2011 |
Another nuclear reactor at the Fukushima No. 1 facility in Japan has lost its emergency cooling capacity, according to the Associated Press, bringing to three the number of reactors at that facility to fall prey to Friday's magnitude 8.9 earthquake and tsunami. Added to failure of three reactors at Fukushima No. 2, the count is now six overall. So far, the only reactor that seems to pose an immediate risk of widespread danger is one of the two shut-down reactors at Fukushima No. 1, also known as Fukushima Daiichi, which was disabled by an explosion overnight that destroyed the building housing the reactor and the backup cooling system.
April 7, 2011 |
For nearly four weeks, Japanese emergency crews have been spraying water on the damaged Fukushima Daiichi nuclear reactors, a desperate attempt to avert the calamity of a full meltdown. Now, that improvised solution to one nuclear nightmare is spawning another: what to do with the millions of gallons of water that has become highly radioactive as it washes through the plant. The water being used to try to cool the reactors and the dangerous spent fuel rods is leaking through fissures inside the plant, seeping down through tunnels and passageways to the lowest levels, where it is accumulating into a sea of lethal waste.
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.
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.
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.
April 1, 2011 |
Since the nuclear plant disaster in Fukushima in Japan, the stock of the company that designed the reactors, General Electric, has fluctuated less than $1 a share. Meanwhile, the operator of the facility, Tokyo Electric Power Co., has seen its share price plunge more than 70%. The explanation: Japanese law reportedly limits liability to the operator, not the designer, of a nuclear power plant. A year ago, we heard similar arguments about the limited exposure of BP in the wake of the oil spill in the Gulf of Mexico.
March 14, 2011 |
Engineers are now pumping seawater laced with boron into two nuclear reactors at Japan's Fukushima No. 1 (Daiichi) power plant 150 miles north of Tokyo and are considering doing it at a third reactor in a last-ditch effort to stave off a meltdown that could release dangerous amounts of radioactivity into the environment. Hydrogen explosions have now occurred at two reactors at the facility. Here's a look at the engineers' efforts and what the potential consequences are, according to various experts.