Reactor No. 1 Suffers Nuclear Meltdown at Fukushima Daiichi, Radioactive Water Possibly Leaking
May 13, 2011 5:45 PM
comment(s) - last by
Tepco engineers use concrete to seal leaks
The top five feet of the core's 13 ft-long fuel rods had melted down after being exposed to the air
Tokyo Electric Power Company (Tepco)
has announced that the No. 1 reactor at the Fukushima Daiichi nuclear power plant has suffered a nuclear meltdown.
The Fukushima Daiichi nuclear power plant was first commissioned in 1971 and is located in the Futaba District of Fukushima Prefecture, Japan. On March 11, 2011, a
9.0-magnitude earthquake struck Japan
, resulting in the disabling of
reactor cooling systems
, radiation leaks and an evacuation zone.
Engineers from Tepco entered the No. 1 reactor for the first time at the end of last week and found that the top five feet of the core's 13 ft-long fuel rods had
after being exposed to the air.
Engineers originally thought only 55 percent of the
core was damaged
since it was submerged in enough water to keep cool and stable, but after discovering a pool of molten fuel at the bottom of the containment vessel, they now worry that this molten fuel burned a hole at the bottom of the vessel prompting water to leak.
Tepco recently sealed a leak at the No. 3 reactor after radioactive water had seeped into the ocean. Also, the No. 2 reactor had radioactive water flowing into the ocean in April. According to Greenpeace, "significant amounts" of radioactive material had slipped into the sea. In fact, illegal amounts of iodine and caesium were found in seaweed as far as 40 miles from the Fukushima Daiichi plant.
In 22 samples of seaweed, ten contained five times the legal limit of iodine 131 and 20 times of caesium 137. This is an issue for several reasons, including the fact that the Japanese household consumes almost 7 lbs of seaweed annually, and fisherman are preparing to harvest this seaweed on May 20.
Engineers have decided to quit flooding the entire reactor core with water because it might make the leak worse. Currently, there is plenty of water at the bottom of the containment vessel to keep the remaining fuel rods and the melted fuel cool.
"We will have to
revise our plans
," said Junichi Matsumoto, Tepco spokesman. "We cannot deny the possibility that a hole in the pressure vessel caused water to leak."
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5/15/2011 12:45:54 PM
No, the tsunami knocked out the backup generators, the earthquake knocked out the power, which lead to a loss of cooling.
5/15/2011 2:18:12 PM
Well that's my point. There wouldn't be loss of cooling if the backup power generators weren't flooded.
The biggest problem they had initially was that there was no safe way of fixing the power supply without exposing workers to dangerous level of radiation.
If there was no tsunami, the backup generators would have provided enough power (probably) to cool the reactors which would have stopped radiation leaking and hampering efforts to bring the situation under control.
The point I'm trying to make is that the power station survived the earthquake, but not the tsunami. You can say that the earthquake caused the tsunami in the first place so it was the culprit ultimately.
"What would I do? I'd shut it down and give the money back to the shareholders." -- Michael Dell, after being asked what to do with Apple Computer in 1997
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