耐震偽装と報道責任

 - 本当のことが知りたいんで...耐震偽装と報道責任にタックルしちゃおうかな、と
 
 

■□ スポンサーサイト

上記の広告は1ヶ月以上更新のないブログに表示されています。
新しい記事を書く事で広告が消せます。

--.--/--(--) |  スポンサー広告  []

 
 

 
 

■□ 柏崎原発の被害を伝える海外メディア

Some worlds media reports about nuclear crisis in Japan,as follows:

Nature
Published: 17 July 2007

Japanese nuclear reactor under-designed for earthquake?
Rapid acceleration shakes up more than the ground in Japan.

http://www.nature.com/news/2007/070716/full/070716-3.html

"An earthquake off the western coast of Japan yesterday hit a nuclear plant with more than twice the jolt that the plant was expected to have to handle. The shock seems to have done little immediate damage, but has raised concerns about whether Japan's nuclear plants are designed to withstand the kind of shaking they are likely to experience.

The magnitude 6.6 earthquake killed at least 9, injured 1,000, and caused the evacuation of a further 10,000 people. At the Kashiwazaki-Kariwa reactor, 10 kilometres from the epicentre, the earthquake sparked a fire, which was soon extinguished, and caused a little more than a litre of radiation-contaminated water from an open pool to spill into the sea. The Tokyo Electric Power Company (TEPCO), which owns the facility, says that the concentration of radiation in the water was lower than national regulations and so poses no threat to people or the environment.

But the episode has sparked concern as to whether Kashiwazaki-Kariwa's seven reactors, as well as the rest of Japan's 55 operating nuclear facilities, are safe. All the Kashiwazaki-Kariwa reactors have been shut down until a safety evaluation has been done.

All shook up

An earthquake's effect on the surface depends on its magnitude, the depth of the epicentre, and the geological nature (hardness/density, formation) of the surrounding area - all of which affect the peak rate at which the ground accelerates in any given direction. This ground acceleration, which is particularly interesting to engineers calculating an earthquake's effect on a building, is measured in 'gal's (centimetres per second per second).

It could get much worse,

Hideyuki Ban, of the Citizens' Nuclear Information Network.


Based mainly on historical precedent, TEPCO designed the reactors at Kashiwazaki-Kariwa assuming that the area would have a maximum ground acceleration of 274 gal. Yesterday, the number 1 reactor at Kashiwazaki-Kariwa experienced an acceleration of 680 gal as the ground slid from east to west; the number 5 reactor accelerated at 442 gal east/west, and the number 6 reactor was hit with 488 gals up/down, as measured on site.

TEPCO is in the middle of re-evaluating the safety of its reactors in line with new guidelines implemented in Japan in September 2006, which call for more stringent safety measures. Surveys of active faults now have to take into account earthquakes going back 130,000 years, for example, compared with the previous standard of 50,000 years. TEPCO plans to finish this re-evaluation by December 2008. Whether this re-evaluation would have affected the maximum 'gal' limit for Kashiwazaki-Kariwa remains unclear.

Safety check

TEPCO now is patrolling the grounds and inspecting the damage. It has not yet given a date on when it will file a safety report. A preliminary check by members of the industry's agency for nuclear and industrial safety found some 50 problems, including radiation leaking from an exhaust filter.

With aftershocks expected for another two weeks, there is much concern. "It could get much worse," says Hideyuki Ban, of the Citizens' Nuclear Information Network in Tokyo.

ADVERTISEMENT

In 2003, TEPCO was forced to shut down all 17 of its reactors over concerns about the accuracy of their safety data. This time, TEPCO has come under fire for being slow in reporting safety information to the government ― it took them six hours to get word about the spilled water to the ministry of industry.

Depending on the outcome of the safety report, which will need to be evaluated by the ministry, it is possible that the seven reactors will be closed down. "We just want to carry out a thorough inspection and take any necessary measures needed to operate the facilities safely," says Yoshinobu Kamijima of TEPCO's press office.
"

CNN

July 18, 2007

Mayor orders shutdown of nuclear plant struck by quake in Japan


http://edition.cnn.com/2007/WORLD/asiapcf/07/17/japan.quake.ap/index.html

"KASHIWAZAKI, /topics/japan" class="cnnInlineTopic">Japan (AP) -- The mayor ordered that a nuclear power plant hit by a strong earthquake be shut down Wednesday until its safety could be confirmed after a long list of problems -- including radiation leaks, burst pipes and fires -- came to light.


Earthquake damage at the site of the Tokyo Electric Power Co Kashiwazaki-Kariwa nuclear power plant.

1 of 4

more photos »

The malfunctions and a delay in reporting the problems at the Kashiwazaki-Kariwa nuclear power plant fueled concerns about the safety of Japan's 55 nuclear reactors, which have suffered a string of accidents and cover-ups.

"They raised the alert too late. I have sent stern instructions that such alerts must be raised seriously and swiftly," Prime Minister Shinzo Abe told reporters in Tokyo. "Those involved should reflect on their actions."

Plant operator Tokyo Electric Power Co. (TEPCO) said Wednesday that the radioactive water leak at the facility was 50 percent bigger than previously announced, but still below danger levels.

The facility is the world's largest nuclear plant in power output capacity. Japan's nuclear plants supply about 30 percent of the country's electricity, but its dependence on nuclear power is coupled with deep misgivings over safety.

The power plant suffered broken pipes, water leaks and spills of radioactive waste when it was hit by the /topics/earthquakes" class="cnnInlineTopic">earthquake Monday, the plant's operator said.

Signs of problems, however, came first not from the officials, but in a plume of smoke that rose up when the quake triggered a small fire at an electrical transformer.

It was announced only 12 hours later that the magnitude 6.8 temblor also caused a leak of about 315 gallons of water containing radioactive material. Officials said the water leak was well within safety standards. The water was flushed into the sea.

The company also said a small amount of radioactive materials cobalt-60 and chromium-51 had been emitted into the atmosphere from an exhaust stack.

Later Tuesday, it said 50 cases of "malfunctioning and trouble" had been found. Four of the plant's seven reactors were running at the time of the quake, and they were all shut down automatically by a safety mechanism.

Officials said there was no harm to the environment, but acknowledged it took a day to discover about 100 drums of low-level nuclear waste that were overturned, some with the lids open.

Don't Miss
Send us your I-Report
Kensuke Takeuchi, a spokesman for TEPCO, called the malfunctions "minor troubles."

Across town, more than 8,000 residents hunkered down for their second night in shelters. The death toll -- nine, with one person missing -- was not expected to rise significantly. Most of the newer parts of town escaped major damage.

For residents, thousands of whom work at the plant, the controversy over its safety compounded already severe problems, which included heavy rains and the threat of landslides, water and power outages, and spotty communications.

"Whenever there is an earthquake, the first thing we worry about is the nuclear plant. I worry about whether there will be a fire or something," said Kiyokazu Tsunajima, a tailor who sat outside on his porch with his family, afraid an aftershock might collapse his damaged house.

"It's frightening, but I guess we are used to it," said Ikuko Sato, a young mother who was spending the night in a crowded evacuation center near her home, which was without water or power.

"It's almost the summer swimming season," she said. "I wonder if it'll be safe to go in the water."

The area around Kashiwazaki was hit by an earthquake three years ago that killed 67 people, but the plant suffered no damage.

Economy, Trade and Industry Minister Akira Amari told TEPCO it must not resume operations at the plant until it has made a thorough safety check. Nuclear power plants around Japan were ordered to conduct inspections.

The plant in Kashiwazaki-Kariwa, 135 miles northwest of Tokyo, eclipsed a nuclear power station in Ontario as the world's largest power station when it added its seventh reactor in 1997.

The Japanese plant, which generates 8.2 million kilowatts of electricity, has been plagued with mishaps. In 2001, a radioactive leak was found in the turbine room of one reactor.

The plant's safety record and its proximity to a fault line prompted residents to file lawsuits claiming the government had failed to conduct sufficient safety reviews when it approved construction of the plant in the 1970s. But in 2005, a Tokyo court threw out a lawsuit filed by 33 residents, saying there was no error in the government safety reviews.

Environmentalists have criticized Japan's reliance on nuclear energy as irresponsible in a nation with such a vulnerability to powerful quakes.

"This fire and leakage underscores the threat of nuclear accidents in Japan, especially in earthquake zones," said Jan Beranek, a /topics/greenpeace_international" class="cnnInlineTopic">Greenpeace official in Amsterdam. "In principle, it's a bad idea to build nuclear plants in earthquake-prone areas."

Nearly 13,000 people packed into evacuation centers in the quake zone, according to the Fire and Disaster Management Agency. By nightfall, the number dropped to about 8,200.

Nine people in their 70s or 80s were killed, and 47 were seriously injured. About 450 soldiers were sent to clear rubble, search for survivors under collapsed buildings, and provide food, water and toilets.

About 50,000 homes were without water and 35,000 were without gas, local official Mitsugu Abe said. About 27,000 households were without power.

Japan has a history of nuclear accidents, some of them deadly.

In 2004, five workers at the Mihama nuclear plant in western Japan were killed and six were injured after a corroded pipe ruptured and sprayed plant workers with boiling water and steam. The accident was the nation's worst at a nuclear facility.

The U.S. Nuclear Regulatory Commission requires that nuclear plants be built with the capacity to withstand the strongest earthquake to hit its site within 100 years. In a "safe shutdown earthquake," the chain reaction in the reactor stops, but the cooling system keeps running so excess heat is carried away from the core.

William Miller, a professor of nuclear engineering at the University of Missouri, said the Kashiwazaki-Kariwa plant "did what it was supposed to. It shut down."



Although its operator said there were leaks, Miller called the amounts he had heard were "so small as to be negligible."

However, David Lochbaum, director of the Nuclear Safety Project at the Union of Concerned Scientists, noted that fire and loss of power, both of which occurred at Kashiwazaki-Kariwa, are the two most likely causes of meltdowns at nuclear facilities. "

BBC
Last Updated: Thursday, 19 July 2007, 12:11 GMT 13:11 UK

The Kashiwazaki nuclear power could be closed for a year

http://news.bbc.co.uk/2/hi/asia-pacific/6905826.stm
"Power cut fears after Japan quake

The Kashiwazaki nuclear power could be closed for a year
There are fears of power shortages in Tokyo, as the scale of the earthquake damage to the country's biggest nuclear power station becomes clear.
The government reportedly wants the Kashiwazaki plant to stay closed for more than a year for safety checks.

Kashiwazaki contributes about 12% of the Tokyo Electric Power Company's supplies to the capital.

Tepco was criticised after revealing that Monday's quake caused more than 50 malfunctions at its Niigata plant.

Tepco is considering restarting six mothballed thermal power plants to meet demand over the summer.

The company has also asked six other Japanese power companies to sell it emergency electricity until the end of September.

"We are working hard to prevent the worse case scenario, an energy shortage," Shogo Fukuda, Tepco spokesman, was quoted by the Associated Press as saying.

"We would also call on our customers to redouble their energy-saving efforts."

Tepco did not say when Kashiwazaki might re-open. The safety checks alone are expected to take until the end of August.

But the Nikkei newspaper reported on Thursday that the government could order the plant to be closed for as long as a year.

Impact on automakers

On Wednesday, Tepco admitted that 50% more radiation was discharged into the sea than had initially been reported, although this remains well below danger levels.

Japanese voice safety fears
Why japan has many reactors

The reported number of barrels containing low-level nuclear waste that tipped over at the plant was increased from 100 to 400, with the lids knocked off 40 of them.

The malfunctions and the subsequent revelation that a fault line could stretch directly under the plant have triggered renewed concern in Japan about the safety of its nuclear industry.

Most nuclear power stations in Japan are built to similar specifications as the plant in Niigata, says the BBC's Chris Hogg in Tokyo.

There are fears that they too could be damaged if they were hit by an earthquake of similar intensity.

A minister has asked power companies to check as soon as possible whether all their nuclear facilities can withstand strong tremors, but the power companies have told them that could take three years, our correspondent adds.

Monday's earthquake left 10 people dead. Hundreds more were injured and scores of homes have been flattened.

The earthquake has also affected Japan's automakers.

The temporary closure of a factory in Kashiwazaki belonging to key supplier Riken Corp - a maker of transmission and engine parts - will force top manufacturers such as Toyota and Nissan to scale back production.

Toyota is to stop production lines at its plants in Aichi on Thursday and Friday, and review the situation on Monday, the Associated Press news agency quoted a spokesman as saying.
"

Times Online
July 19, 2007
Nuclear crisis in Japan as scientists reveal quake threat to power plants
http://www.timesonline.co.uk/tol/news/world/asia/article2096238.ece

"he world’s biggest nuclear power station stands directly above an active earthquake faultline, which provoked an atomic spill this week, seismologists revealed yesterday.

The disclosure that the Kashiwazaki plant was prone to further earthquake damage threw Japan’s nuclear industry into crisis as seismologists recommended that up to a third of the country’s 55 atomic power stations should be closed for inspection.

In addition to the seismic threat to the Kashiwazaki plant, scientists identified an active threat to one of Japan’s oldest nuclear power stations and demanded that it should be closed immediately.

The former head of the country’s top authority on earthquake prediction told The Times that the Shizuoka plant posed a serious safety risk and that atomic experts were calling for it to be shut down.

Earthquake triggers nuclear safety fears
Abe seeks redemption in earthquake rubble
On the spot: driving in a Japanese earthquake
Professor Kiyoo Mogi, of Tokyo University, the former chairman of the Co-ordinating Committee of Earthquake Prediction Japan, said it was “hard at this stage to say how many nuclear power plants should be stopped”. He added: “But I can say Hamaoka power plant in Shizuoka should be stopped immediately.”

The precarious state of the Kashiwazaki plant was underscored by an earthquake on Monday that knocked over hundreds of drums of nuclear waste, many of which split open during the tremors. The town’s mayor ordered all activity at the power station to be suspended indefinitely. It was shut down temporarily during the quake.

The suspension, and the threat of widespread disruption to nuclear plants around the country, was likely to herald “a hot summer of blackouts” in parts of central Japan, according to energy analysts. The power shortages would affect factories and businesses across the region. Japan, which has almost no oil or gas reserves, generates 33 per cent of its electricity in nuclear power stations, but the Government hopes to increase this to 40 per cent by 2010.

The revelations of Kashiwazaki’s geological weakness dealt a massive blow to the credibility of the Tokyo High Court and to the National Institute of Advanced Industrial Science and Technology ― the government- affiliated body whose survey showed the fault to be about 15km (nine miles) from the plant.

In 2005, fearing the effects of a large quake, a group of residents fought to have Kashiwazaki’s license to build a new reactor revoked. The Tokyo High Court rejected the plaintiffs’ claim that an active fault ran under the station, concluding that what the residents thought was an active fault “did not even amount to a fault and could not cause a quake”. Atomic experts said yesterday that the discovery may dramatically challenge the safety of the entire atomic energy supply in Japan and that as many as a third of the country’s 55 nuclear power stations might have to be suspended until they were made sufficiently quake-proof to be restarted.

The chaotic response by the Tokyo Electric Power Company (Tepco) to the earthquake and its after-effects prompted Mohamed ElBaradei, the Director-General of the International Atomic Energy Agency, to demand that Japan should conduct a full examination of the plant. “Japan needs to go into full investigation of the structure, of the systems, of the components of the reactor,” he said, offering to send a team of IAEA experts to assist.

Reflecting growing concerns that Tepco may be unaware of or has concealed the extent of the damage at Kashiwazaki, Dr ElBaradei added: “I would hope that Japan would be fully transparent in its investigation of the accident.” The catalogue of problems so far discovered by investigators at Kashiwazaki includes several leaks of radioactive materials, a fire, and the toppling of 438 drums of low-level radioactive waste. Hiroshi Aida, the Mayor of Kashiwazaki, said that his staff’s own investigation had found that the ground on which the plant was built had been distorted and suffered several cave-ins.

The Japanese Government fiercely attacked the sloppy response of Tepco.

Akira Fukushima, the deputy director-general for nuclear safety, said: ”We definitely think the report from Tepco was delayed, and this is very serious.”

Hunger for energy

― Japan imports 80 per cent of primary energy needs

― It began a nuclear power programme in 1954. Its first commercial reactor, a 160MWe model imported from Britain, came on line in 1966

― The “oil shocks” beginning in 1973 exposed Japan’s economic vulnerability, leading to an expansion of the nuclear programme

― Japan is involved in designing new reactors to be used domestically and exported overseas

― The Japan Atomic Energy Agency was established in 2005 from the merger of several other bodies. It employs 4,400 people and has an annual budget of 161 billion yen (£640 million)

― Japan’s 55 normally active reactors generate about one third of the country’s electricity. This is planned to increase to 41 per cent by 2014

Sources: JAEA; Uranium Information Centre
"
スポンサーサイト

2007.07/20(金) |  未分類  | Comment(0)  []

 
 

* COMMENT *

 
 
 
 
 
    
 *   管理者にだけ表示を許可する

Rental - FC2 Blog /  SKIN - ふたつの頬花

FC2Ad

 /   

上記広告は1ヶ月以上更新のないブログに表示されています。新しい記事を書くことで広告を消せます。