Q+A: What do latest events at Japan nuclear power plant mean? Posted by Meosha Eaton

By Elaine Lies

March 16 (Reuters) - Japan's nuclear crisis worsened on Wednesday, with workers ordered to withdraw briefly from the stricken power plant after radiation levels spiked, just hours after smoke was seen rising from the quake-crippled nuclear facility.


Q: What does the smoke mean?

A: The smoke is most likely to be steam, a natural byproduct of pouring water into the reactors to cool them down and keep the fuel rods covered. Authorities are also trying to maintain water levels at a spent-fuel storage pool at the plant's No. 4 reactor, which experts now view as the real threat.

The steam is an issue because it contains radioactive particles, but experts say these particles may not be as serious as, say, an explosion within a reactor core. So far, it appears the radiation is mostly escaping in the form of steam and some experts believe the radioactive particles could merely be dust or from rusted structures within the reactor buildings -- known as "crud" within the nuclear industry. Radiation levels have not risen significantly in Tokyo, about 240 km to the south.


Q: Why is the situation at the spent-fuel pool a worry?

A: Unlike the reactors themselves, which are inside two containers -- a massive steel container as well as one made of concrete -- the fuel pools are not, with meters of water on top of the rods providing safety only under normal circumstances. Another concern with reactor No. 4 is that the water levels in the pool could be falling, perhaps because the water is or has been boiling and is evaporating as steam.

While nobody knows exactly how much damage Tuesday's explosion did to the building, the structure does have holes and some experts have said that proposals to drop boric acid particles on the reactor suggest substantial holes in the roof.

"That's got to be protected. I'd hate to see another explosion there," said Murray Jennex, a professor at San Diego State University in California.


Q: What can be done?

A: Dropping boric acid could be helpful since it is both a fire suppressant and also absorbs radiation, while keeping water levels up in the pool is also essential. Finally, a fresh crew of workers should be sent into the plant since those who are in there are likely exhausted and may be making poor decisions, which could be adding to problems.


Q: What about the spent-fuel pools at the other reactors?

A: There are six reactors at the Daiichi complex. Three of them - no. 4 through No.6 - were offline for maintenance at the time of the quake. There are signs that water temperatures are also rising at No.5 and No.6 spent-fuel pools.

But the spent fuel at these two pools, as well as at the three reactors that were online at the time of the quake, is all older and thus less likely to pose an overheating threat.


Q: What about the other reactors?

A: There have been explosions at reactors No.1, No.2 and No.3, and suspicions that the suppression pool at No. 2 may have been damaged. But experts say that current low radiation levels suggest that the container vessels at these reactors are by and large holding, and that they're actually more optimistic about this situation than they were on Tuesday.

Doubt does remain about possible damage to the suppression pool at No. 2, but these are "overdesigned" to cope with a certain amount of damage.


Q: What do we need to watch out for?

A: Steadily rising radiation levels are the main worry, along with a fall in the water level in the spent fuel pool. Radiation levels at the plant's main gate spiked on Wednesday morning but have since fallen back, which is a good sign.

"If we have the water level doing down and rising radiation, that's a bad sign, because this means more and more of this fuel (is) exposed," said Najm Meshati, professor of civil and environmental engineering, at the University of Southern California at Los Angeles.

(Editing by Mark Bendeich

UN News: Earthquake and tsunami in Japan - Ban Ki-moon Media Stakeout , Posted by Menelik Zeleke

11 March 2011
Informal comments to the media by H.E. Mr. Ban Ki-moon, Secretary-General of the United Nations on the earthquake and tsunami in Japan

Food and water shortage at earthquake shelter in Sendai, Japan, Posted by Meosha Eaton

More than 3,000 residents in Sendai, Japan took shelter at a suburban high school of the city after the 9-magnitude earthquake devastated their homes. Due to the current shortage of food and water supply, only children and seniors at and above 75 years old are provided with food at the emergency shelter.

Each of the people taking shelter here has a ration of only two bottles of water every day. As the access to the disaster area is cut off, the shipment of good, especially food and drinking water, to Sendai is also blocked.

Food supply to the shelter dwellers has come to a halt as of today. Still people have to live here, as their own homes are no longer in existence or safe after the catastrophic earthquake. Given the constant aftershocks at present, the shelter is the best place they could find for the time being.

"I moved here yesterday," said a young woman. "How is your own home?" asked the reporter. "Its appearance looks ok, but inside it's all a mess," said the young woman.

"My home is gone completely, with the TV set and other things rocked down everywhere, and it's dangerous to go back there," said a woman.

"Have you got a food ration?" asked the reporter.
"No, only children and seniors at and above 75 years old are entitled to a food ration," answered the woman.

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