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Showing posts with label #Chernobyl. Show all posts
Showing posts with label #Chernobyl. Show all posts

Saturday, March 19, 2011

Nuclear Plant Chief WEPT, Admission Radiation Enough To Kill, Radiation Plume Toward U.S. Coast? "Plume"=Fear Mongering


The moment nuclear plant chief WEPT as Japanese finally admit that radiation leak is serious enough to kill people 

By DAVID DERBYSHIRE
Last updated at 3:54 PM on 19th March 2011
  • Officials admit they may have to bury reactors under concrete - as happened at Chernobyl
  • Government says it was overwhelmed by the scale of twin disasters
  • Japanese upgrade accident from level four to five - the same as Three Mile Island
  • We will rebuild from scratch says Japanese prime minister
  • Particles spewed from wrecked Fukushima power station arrive in California
  • Military trucks tackle reactors with tons of water for second day 
Overwhelmed: Tokyo Electric Power Company Managing Director Akio Komiri cries as he leaves after a press conference in Fukushima
Overwhelmed: Tokyo Electric Power Company Managing Director Akio Komiri cries as he leaves after a press conference in Fukushima
The boss of the company behind the devastated Japanese nuclear reactor today broke down in tears - as his country finally acknowledged the radiation spewing from the over-heating reactors and fuel rods was enough to kill some citizens
Japan's Nuclear and Industrial Safety Agency admitted that the disaster was a level 5, which is classified as a crisis causing 'several radiation deaths' by the UN International Atomic Energy.
Officials said the rating was raised after they realised the full extent of the radiation leaking from the plant. They also said that 3 per cent of the fuel in three of the reactors at the Fukushima plant had been severely damaged, suggesting those reactor cores have partially melted down.
After Tokyo Electric Power Company Managing Director Akio Komiri cried as he left a conference to brief journalists on the situation at Fukushima, a senior Japanese minister also admitted that the country was overwhelmed by the scale of the tsunami and nuclear crisis.
He said officials should have admitted earlier how serious the radiation leaks were. 
Chief Cabinet Secretary Yukio Edano said: 'The unprecedented scale of the earthquake and tsunami that struck Japan, frankly speaking, were among many things that happened that had not been anticipated under our disaster management contingency plans.
'In hindsight, we could have moved a little quicker in assessing the situation and coordinating all that information and provided it faster.'
Nuclear experts have been saying for days that Japan was underplaying the crisis' severity.
It is now officially on a par with the Three Mile Island accident in Pennsylvania in 1979. Only the explosion at Chernobyl in 1986 has topped the scale.
Deputy director general of the NISA, Hideohiko Nishiyama, also admitted that they do not know if the reactors are coming under control. 
He said: 'With the water-spraying operations, we are fighting a fire we cannot see. That fire is not spreading, but we cannot say yet that it is under control.'
But prime minister Naoto Kan insisted that his country would overcome the catastrophe

'We will rebuild Japan from scratch,' he said in a televised speech: 'In our history, this small island nation has made miraculous economic growth thanks to the efforts of all Japanese citizens. That is how Japan was built.'


Read more: http://www.dailymail.co.uk/news/article-1367684/Japan-earthquake-tsunami-Fukushima-nulear-plant-radiation-leak-kill-people.html#ixzz1H49IKAUS


Dr. Jon LaPook

Dr. Jon LaPook

Posted: March 19, 2011 11:50 AM

Radioactive Plume? The Coast Is Clear


My wife and two sons are flying from New York to Los Angeles this morning but I'm not worried about the so-called "radioactive plume" coming from the crippled Japanese nuclear reactors. In fact, I hate the term "radioactive plume" -- now appearing widely in the media -- because it conjures up an image that is much scarier than the reality of the radiation danger to the West Coast. 

Yesterday, as concerned residents in California and Washington awaited further news about the plume, the Associated Press reported that a diplomat with access to radiation tracking by the U.N.'s Comprehensive Test Ban Treaty Organization said tiny amounts of radiation had reached California. But as radiation expert Dr. Donald Bucklin told me, these instruments "can measure miniscule changes in radiation" that have "absolutely no effect on human beings." In fact, according to the diplomat, initial readings were not dangerous in any way -- "about a billion times beneath levels that would be health threatening."

Despite reassurances from many different experts and agencies, fear -- much more than radioactivity -- was in the air: tweeted, emailed, and broadcast. A physician friend in L.A. emailed me that there was widespread panic among his patients and asked me to go on CBS radio -- which I did -- to try to provide a reality check. The situation in Japan is still dangerous and fluid but after consulting with experts on radiation and nuclear accidents over the past several days, here's why I'm not worried about my family flying to California:

1) Chernobyl was a much worse accident yet no significant radiation reached the U.S. 

CBS nuclear safety consultant Cham Dallas, PhD told me that the radiation released at Chernobyl was 100 times more than the combined radiation from Hiroshima and Nagasaki. But only an insignificant "blip" of radiation reached Savannah, Georgia about 5400 miles away -- about the same distance as Tokyo is to Los Angeles. And no health problems in the U.S. have been detected as a result of Chernobyl, which was a level 7 incident according to The International Atomic Energy Agency; the crisis in Japan is currently level 5.

2) Experts tell me the amount of radiation released from the Japanese nuclear reactors is not nearly enough to cause a problem in the U.S.

Radiation dose is measured in something called "millisieverts." Background dose due to natural radiation exposure varies from place to place but is about 3 millisieverts a year. Nuclear plant workers are limited to 20 millisieverts a year. One hundred millisieverts in one dose can increase the risk of cancer. One hundred to 500 millisieverts can cause bone marrow damage, leading to infection and death. A chest x-ray is 0.1 millisieverts. 

The Tokyo Metropolitan Government announced yesterday that radiation levels in downtown Tokyo were at 0.000047 millisieverts an hour, barely higher than the 0.000035 microsieverts an hour that is typical. 

Cham Dallas told me that -- as it stands now -- any cumulative radiation exposure to people on the West Coast as a result of the Japanese accident should be clinically insignificant, amounting to less than a tenth of a chest x-ray (0.01 millisieverts).

3) Direct measurements of radiation on the West Coast reveal no significant increase so far.


Yesterday, health officials in California and Washington said radiation is not higher than usual. Last night, the Environmental Protection Agency confirmed that no radiation levels of concern have reached the United States, saying: "The doses received by people per day from natural sources of radiation -- such as rocks, bricks, the sun and other background sources -- are 100,000 times the dose rates from the particles and gas detected in California or Washington State."

On the West Coast, pharmacies are being cleaned out of potassium iodide pills by people wanting to protect themselves from thyroid cancer caused by radioactive I-131. The CDC has tweeted not to take potassium pills but either the word has not gotten out or people are not believing the word. Yesterday I received an email from a patient in Los Angeles asking me if she should stockpile potassium iodide. The answer is a definitive "absolutely not." And under no conditions should anybody take iodide pills or other forms of iodine without being told to do so by a health professional; the side effects can be very serious.

Obviously, in Japan the situation is quite different from here in the United States. 

Wednesday, March 16, 2011

Fukushima: Spent Fuel Rods Exposed Equaling Extremely High Radiation


Official: Spent fuel rods exposed, 'extremely high' radiation resulted

By the CNN Wire Staff
March 16, 2011 8:32 p.m. EDT
STORY HIGHLIGHTS
  • NEW: IAEA says temperatures in spent fuel pools are rising
  • NEW: "No data" for Unit 4, IAEA says
  • "Extremely high" levels of radiation, says NRC chief
  • Situation is "very, very serious," says nuclear expert
Tokyo (CNN) -- Spent fuel rods in Unit 4 of Japan's stricken Fukushima Daiichi nuclear plant have been exposed, resulting in the emission of "extremely high" levels of radiation, the head of the U.S. Nuclear Regulatory Commission said Wednesday.
"What we believe at this time is that there has been a hydrogen explosion in this unit due to an uncovering of the fuel in the fuel pool," Gregory Jaczko told a House energy and commerce subcommittee hearing. "We believe that secondary containment has been destroyed and there is no water in the spent fuel pool, and we believe that radiation levels are extremely high, which could possibly impact the ability to take corrective measures."
The water served to both cool the uranium fuel and shield it. But once the uranium fuel was no longer covered by water, the zirconium cladding that encases the fuel rods heated, generating hydroge... "This is a situation where people may be called in to sacrifice their lives. ... It's very difficult for me to contemplate that but it's, it may have reached that point."
When will the Japan crisis end?
How bad is Japanese radiation risk?
Evacuations at damaged power plant

Gallery: Japan reeling after massive quakeExplainer: Producing nuclear energy
...A Japanese Self-Defense Force helicopter aborted its mission to drop water over the reactor because of the high radiation levels in the area...
The International Atomic Energy Agency said the temperature of water in spent fuel pools is typically kept below 25 degrees Celsius (77 degrees Fahrenheit). That requires a constant cooling source, which requires a constant power source, something not available at the plant in the aftermath of Friday's earthquake and tsunami.
"The concern about the spent fuel pools at Fukushima Daiichi is that sources of power to cool the pools may have been compromised," IAEA said ...
...Three reactors were being cooled with seawater and their primary containment vessels were described as "functional," he said.
But core cooling was "not stable" for unit No. 2, he said. Though the primary containment appeared to be functioning, "we believe that the spent fuel pool level is decreasing."
At unit No. 3, he said, the integrity of the spent fuel pool appeared to have been compromised and there may have been a reaction between the zirconium cladding and the water.
Jaczko's grim announcement confirmed fears that the nuclear crisis would worsen...
Tests on tap water in Fukushima city, 80 kilometers (50 miles) away, found radiation, though at levels not harmful to the human body...
IAEA Director General Yukiya Amano said Wednesday he will travel to Japan "as soon as possible, hopefully (Thursday)" to get the latest on the situation and to see how the U.N.'s nuclear watchdog agency can best help Japanese authorities, he said. He will stay one night, he added
...Military officials said they had deployed an atmospheric detection aircraft, the WC-135W Constant Phoenix, to assist in detecting radioactive materials in the atmosphere around Japan.
The aircraft can "detect radioactive 'clouds' in real time," according to the Air Force...
Officials told workers at the plant to evacuate Wednesday after the vapor rose above the plant and radiation levels spiked. Radiation levels later fell, and authorities allowed the workers to return, the Tokyo Electric Power Company said.
The number of nuclear workers remaining on site was slashed Tuesday from 800 to 50 but had grown to 180 by Wednesday afternoon, the power company said.
About 200,000 people living within a 20-kilometer radius of the plant have been evacuated; those living 20 to 30 kilometers from the site have been told to remain inside. Authorities also have banned flights over the area...
U.S. President Barack Obama was briefed Wednesday by the chairman of the U.S. Nuclear Regulatory Commission on the "deteriorating situation" of the damaged nuclear reactors, Carney said...
Between Units 3 and 4, Japanese authorities said they had measured radiation dose rates of up to 400 millisieverts per hour, IAEA reported Tuesday. That's equivalent to about 2,000 chest X-rays per hour, the agency said on its website. "This is a high dose-level value, but it is a local value at a single location and at a certain point in time," it added.
As a result of the monitoring of about 150 people from around the Daiichi site, 23 have been decontaminated, IAEA said..http://www.cnn.com/2011/WORLD/asiapcf/03/16/japan.nuclear.reactors/index.html.

image
This image made available from Tokyo Electric Power Co. via Kyodo News, shows the damaged No. 4 unit of the Fukushima Dai-ichi nuclear complex in Okumamachi, northeastern Japan, on Tuesday March 15, 2011. White smoke billows from the No. 3 unit. (AP Photo/Tokyo Electric Power Co. via Kyodo News)
Nuclear crisis a tangle of ominous, hopeful signs

Earlier, however, another utility spokesman said officials’ greatest concerns were the spent fuel pools, which lack the protective shells that reactors have.
“We haven’t been able to get any of the latest data at any spent fuel pools. We don’t have the latest water levels, temperatures, none of the latest information for any of the four reactors,” Masahisa Otsuki said.
If Jaczko is correct, it would mean there’s nothing to stop the used fuel rods from getting hotter and ultimately melting down. The outer shells of the rods could also ignite with enough force to propel the radioactive fuel inside over a wide area...
“My understanding is there is no water in the spent fuel pool,” Jaczko told reporters after the hearing. “I hope my information is wrong. It’s a terrible tragedy for Japan.”

He said the information was coming from NRC staff in Tokyo who are working with the utility in Japan. He said the staffers continue to believe the spent fuel pool is dry.
Other countries have complained that Japan has been too slow and vague in releasing details about its rapidly evolving crisis at complex of six reactors along Japan’s northeastern coast, which was ravaged by Friday’s magnitude-9.0 earthquake and subsequent tsunami.
The chief of the U.N. nuclear agency, Yukiya Amano, said he would go to Japan to assess what he called a “very serious” situation and urged Tokyo to provide better information to his organization.
Several countries have advised their citizens to consider leaving Tokyo and earthquake-affected areas. The White House recommended Wednesday that U.S. citizens stay 50 miles (80 kilometers) away from the Fukushima Dai-ichi plant, not the 20-mile (32-kilometer) radius recommended by the Japanese government.
Japanese officials raised hopes of easing the crisis, saying early Thursday that they may be close to bringing power back to the plant and restoring the reactors’ cooling systems. The earthquake and tsunami knocked out power and ruined backup generators.

Analysis: Japan nuclear crisis reaches new levels


(Reuters) - Japan's nuclear crisis may have taken its most dangerous turn yet after a U.S. official said one of the pools containing highly radioactive spent fuel rods at the stricken plant had run dry.
One nuclear expert said that there was now even a possibility that the disaster may approach the extent of the Chernobyl accident, the worst ever in the industry's history. When the Chernobyl plant in Ukraine exploded in 1986 it spewed a radiation cloud over a large area of Europe.
And a nuclear engineer said that it may be time to consider ways to bury or cover the entire complex in some kind of material that would stop radiation from leaking into the atmosphere.
Triggering the new levels of alarm were comments by U.S. Nuclear Regulatory Commission Chairman Gregory Jaczko in Congress on Wednesday. "There is no water in the spent fuel pool and we believe that radiation levels are extremely high, which could possibly impact the ability to take corrective measures," he said.

To read a confirmation at IAEA about

Japanese Earthquake Update (16 March 22:00 UTC)

Temperature of Spent Fuel Pools at Fukushima Daiichi Nuclear Power Plant

U.S. Calls Radiation ‘Extremely High’ and Urges Deeper Caution in Japan

DigitalGlobe, via Reuters
Workers are struggling at the Fukushima Daiichi plant, seen in a satellite photo at 9:35 a.m. Wednesday.