>Japan Nuclear Disaster Put on Par With Chernobyl(Video)

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Japan has decided to raise its assessment of the accident at the crippled Fukushima Daiichi nuclear power plant to the worst rating on an international scale, putting the disaster on par with the 1986 Chernobyl explosion, the Japanese nuclear regulatory agency said on Tuesday.

The decision to raise the alert level to 7 from 5 on the scale amounts to an admission that the accident at the nuclear facility, brought on by the March 11 earthquake and tsunami, is likely to have substantial and long-lasting consequences for health and for the environment. Some in the nuclear industry have been saying for weeks that the accident released large amounts of radiation, but Japanese officials had played down this possibility.

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The new estimates by Japanese authorities suggest that the total amount of radioactive materials released so far is equal to about 10 percent of that released in the Chernobyl accident, said Hidehiko Nishiyama, deputy director general of Japan’s nuclear regulator, the Nuclear and Industrial Safety Agency.

Mr. Nishiyama stressed that unlike at Chernobyl, where the reactor itself exploded and fire fanned the release of radioactive material, the containments at the four troubled reactors at Fukushima remained intact over all.

But at a separate news conference, an official from the plant’s operator, Tokyo Electric Power Company, said, “The radiation leak has not stopped completely and our concern is that it could eventually exceed Chernobyl.”

On the International Nuclear Event Scale, a Level 7 nuclear accident involves “widespread health and environmental effects” and the “external release of a significant fraction of the reactor core inventory.” The scale, which was developed by the International Atomic Energy Agency and countries that use nuclear energy, leaves it to the nuclear agency of the country where the accident occurs to calculate a rating based on complicated criteria.

Japan’s previous rating of 5 placed the Fukushima accident at the same level as the Three Mile Island accident in Pennsylvania in 1979. Level 7 has been applied only to the disaster at Chernobyl, in the former Soviet Union.

“This is an admission by the Japanese government that the amount of radiation released into the environment has reached a new order of magnitude,” said Tetsuo Iguchi, a professor in the department of quantum engineering at Nagoya University. “The fact that we have now confirmed the world’s second-ever level 7 accident will have huge consequences for the global nuclear industry. It shows that current safety standards are woefully inadequate.”

Mr. Nishiyama said “tens of thousands of terabecquerels” of radiation per hour have been released from the plant. (The measurement refers to how much radioactive material was emitted, not the dose absorbed by living organisms.) The scale of the radiation leak has since dropped to under one terabecquerel per hour, the Kyodo news agency said, citing government officials.

The announcement came as Japan was preparing to urge more residents around the crippled nuclear plant to evacuate, because of concerns over long-term exposure to radiation.

The authorities have already ordered people living within a 12-mile radius of the plant to evacuate, and recommended that people remain indoors or avoid an area within a radius of about 19 miles.

The government’s decision to expand the zone came in response to radiation readings that would be worrisome over months in certain communities beyond those areas, underscoring how difficult it has been to predict the ways radiation spreads from the damaged plant.

Unlike the previous definitions of the areas to be evacuated, this time the government designated specific communities that should be evacuated, instead of a radius expressed in miles.

The radiation has not spread evenly from the reactors, but instead has been directed to some areas and not others by weather patterns and the terrain. Iitate, one of the communities told on Monday to prepare for evacuation, lies well beyond the 19-mile radius, but the winds over the last month have tended to blow northwest from the Fukushima plant toward Iitate, which may explain why high readings were detected there.

>Japanese nuclear reactor in peril

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Japanese authorities and the U.S. military on Saturday were racing to find ways to deliver new backup generators or batteries to a nuclear power reactor whose cooling facilities have been crippled by a loss of power as a result of the earthquake.
The reactor, owned by Tokyo Electric Power Co., is currently drawing on battery power that may last only a few hours. Without electricity, the reactor will be unable to pump water to cool its hot reactor core, possibly leading to a meltdown or some other release of radioactive material.
Japanese authorities informed the International Atomic Energy Agency’s Incident and Emergency Center that they have ordered the evacuation of about 3,000 residents within a 1.9-mile radius of the Fukushima Daiichi nuclear power plant, and told people within a 16.2-mile radius to remain indoors, according to the IAEA Web site.
The cooling problem is with the second of six reactors at the plant, located on the east coast of Japan about 200 miles north of Tokyo and south of the heavily damaged town of Sendai. Separately there were reports of elevated radiation levels inside the control room of one of the other reactor units, which was built 40 years ago. Sources said that the authorities were contemplating venting from that unit.
Altogether, 11 Japanese nuclear reactors shut down automatically as they are designed to do in case of an earthquake.
“The multi-reactor Fukushima atomic power plant is now relying on battery power, which will only last around eight hours,” said Kevin Kamps, a specialist in nuclear waste at Beyond Nuclear, a group devoted to highlighting the perils of nuclear power. “The danger is the very thermally hot reactor cores at the plant must be continuously cooled for 24 to 48 hours. Without any electricity, the pumps won’t be able to pump water through the hot reactor cores to cool them.”
“There’s a basic cooling system that requires power, which they don’t have,” said Glenn McCullough, former chairman of the Tennessee Valley Authority who has been keeping track of the situation in Japan. He said that as a result of the tsunami, water had gotten into the diesel generators that would otherwise have provided backup power.
In a statement that confused nuclear experts, Secretary of State Hillary Rodham Clinton said Friday morning that U.S. Air Force planes in Japan had delivered “coolant” to a nuclear power plant affected by the quake. Nuclear reactors do not use special coolants, only large amounts of pumped water.
“They have very high engineering standards, but one of their plants came under a lot of stress with the earthquake and didn’t have enough coolant,” she said, “and so Air Force planes were able to deliver that.” It remained unclear what the Air Force had delivered.
Just hours after the quake, Japan’s Nuclear and Industrial Safety Agency (NISA) declared a heightened state of alert at the Fukushima Daiichi nuclear power plant, according to the IAEA. NISA said that no release of radiation has been detected.
The evacuation comes after NISA said Friday that a fire broke out at the Onagawa nuclear power plant but was later extinguished.
The plant is about 45 miles north of the city of Sendai, which was badly damaged by the deadly earthquake and tsunami that hit Japan Friday afternoon. Sendai is the population center nearest the epicenter of the quake, and Japan’s Kyodo News agency said that more than 200 bodies had been found so far near the city.
The key buildings in the Onagawa plant are about 15 meters above sea level, according to the Web site of Tohoku Electric Power, owner of the plant. The company said that was about twice the height of the previous highest tsunami.
Japanese authorities told the IAEA that that the Onagawa, Fukushima-Daini and Tokai nuclear power plants shut down automatically, and no radiation release has been detected. The plants have multiple nuclear reactors.
The IAEA said it is seeking details on Fukushima Daiichi and other nuclear power plants and research reactors, including information on off-site and on-site electrical power supplies, cooling systems and the condition of the reactor buildings. Nuclear fuel requires continued cooling even after a plant is shut down, the IAEA noted. “This is the most challenging seismic event on record, so it is a severe test,” said McCullough. “Clearly the Japanese government is taking this very seriously.”