Wall Street fecha semana sem rumo. Grandes tecnológicas pressionam

[sombrio]

nao sei se conheces este site:

http://hisz.rsoe.hu/alertmap/index2.php

tens aqui o nivel de classificacao (na escala INES) que estava em 4 e ja passou para 5 com o ponto de interrogacao.

http://hisz.rsoe.hu/alertmap/woalert_read.php?cid=29877

[MarcoAntonio]

Mais info actualizada sobre níveis de radiação detectados, que atingem novos máximos:

Harmful Radiation Level Detected At Plant


TOKYO (Nikkei)--The radiation level at the Fukushima No. 1 nuclear power plant on Tuesday morning increased to a level considered potentially harmful to humans.

That reading, 400 millisieverts per hour, is 400 times the maximum amount of radiation deemed acceptable over one year.

The nuclear crisis triggered by Friday's earthquake may be of a severity equal to that of the Three Mile incident in the U.S., experts say.

On Tuesday morning, a hydrogen explosion occurred at a building that houses spent nuclear fuel at the plant's No. 4 reactor. The reactor had already been taken off-line for regular inspections when the temblor struck.

Also on Tuesday morning, the No. 2 reactor's suppression pool, located in the lower part of the containment vessel, was damaged by a blast.

Prime Minister Naoto Kan urged people within 30km of the plant to stay indoors. Those within 20km had already been told to evacuate.

At a press conference Tuesday morning, Chief Cabinet Secretary Yukio Edano said radiation levels near the facility are far higher than those observed earlier, and have reached amounts that could pose possible health risks.

Higher-than-usual radiation levels have also been detected in the Kanto region, including in Ibaraki, Tokyo and Kanagawa prefectures, but not in amounts deemed harmful.

(The Nikkei March 15 evening edition)

[MarcoAntonio]

PHYSICIST SAYS MELTDOWN NOT LIKE CHERNOBYL
Carl Holm for Science Online, ABC
March 14, 2011, 5:14 pm


Experts say a core meltdown at the Fukushima nuclear plant is unlikely to result in a Chernobyl-like disaster, but its impact will still be significant.

Despite a second explosion at the site, Japanese authorities are playing down the danger of a core meltdown in one of the reactors.

Most experts are comparing the situation to the 1979 Three Mile Island accident, which resulted in radiation affecting an area 16 kilometres around the reactor.

Professor Aidan Byrne, director of the College of Mathematical and Physical Sciences at the Australian National University in Canberra, says Three Mile Island failed because of lack of cooling water.

"This one is a slightly different scenario because they're able to put cooling water onto it, so it might not progress to that scale," he said.

When a reactor is running normally the fuel rods are surrounded by coolant, and lowered or raised to regulate the number of nuclear reactions, known as fission.

"In a meltdown you lose the coolant and the fuel rods get hot enough to actually physically melt, which is a couple of thousand degrees Celsius," Professor Byrne said.

"The Japanese reactors [also] have a containment vessel around them, and the hope here is that as with Three Mile Island, if there is a meltdown then it will be within that containment vessel."

Some reports are comparing the situation at Fukushima with the Chernobyl disaster of 1986.

In that accident, nuclear fission ran unchecked and the reactor lacked the multi-barrier containment strategy that exists in the 40-year-old Fukushima plant.

Professor Byrne says that unlike Chernobyl, Fukushima's nuclear reactors have been shut down and control rods have been inserted stopping the fission chain reaction.

The main concern is if the reactor is not cooled down, the radioisotopes in the fuel rods and decay-heat will heat up the container.

According to Japanese authorities, seawater mixed with boric acid is being used to cool the reactor down, which should reduce the risk of a fission reaction restarting.

Worst-case scenario

Currently the reactors are releasing small amounts of xenon-137 and iodine-131, which have a half life of 3.8-minutes and eight days respectively.

But experts are more concerned by the release of cesium-137, which has a 30-year half-life.

Professor Byrne says there is still a chance the Japanese reactors could go into meltdown.

"It's not impossible because they have problems with the coolant," he said.

"The Three Mile Island accident which is the previous one similar to this certainly did have a core meltdown, so it could happen in one or maybe even two of these [reactors].

"The anxiety here is that it ruptures explosively and projects stuff into the atmosphere ... but even then it would not be of the magnitude of the Chernobyl reactor."

Professor Byrne says it is not possible to speculate on how bad the health effects would be because it would depend on the amount of radiation released and where the prevailing winds took the particles.

But he says as long as efforts to cool the reactors continue, the likelihood of a complete meltdown will decrease.

[MarcoAntonio]

os 3 reactores estao fora de controlo, e a situacao do ultimo que explodiu é mesmo grave.

Epá, ó sombrio, não é por escreveres repetidamente a mesma coisa que tecnicamente e em concreto não diz nem demonstra coisa nenhuma que o que disseste passa a estar provado!

Se não tens a noção das diferenças entre os dois casos e porque é que não são directamente comparáveis tens info aqui no tópico e uma série de sites na internet que esclarecem...

[sombrio]

os 3 reactores estao fora de controlo, e a situacao do ultimo que explodiu é mesmo grave.

[MarcoAntonio]

este texto so prova o que eu disse.

O que tu disseste foi isto:

fdxx, este desastre ainda vai ser pior que o de chernobyl

Queres esclarecer onde é que esse texto prova o que disseste?

[MarcoAntonio]

Tem uma boa noite

Já conto três posts onde mostras um sorriso...

Eu estou aqui a debater um assunto sério de uma situação séria que está a decorrer.

Obviamente não estamos de todo na mesma onda...


Uma boa noite para ti também, naturalmente, mas sem sorrisos.

[sombrio]

Entretanto mais info actualizada...

Radiation Leak Feared At Nuke Plant, People Urged To Stay Indoors

TOKYO (Kyodo)--The crisis at the quake-hit Fukushima No. 1 nuclear plant reached a critical phase Tuesday with radiation feared to have leaked after apparent hydrogen blasts at two more reactors, triggering growing fears of widespread contamination.

Prime Minister Naoto Kan urged people living between 20 and 30 kilometers of the plant to stay indoors, after radiation equivalent to 400 times the level to which people can safely be exposed in one year was detected near the No. 3 reactor in the plant.

Residents within a 20-km radius have already been ordered to vacate the area following Saturday's hydrogen blast at the plant's No. 1 reactor.

''The danger of further radiation leaks (from the plant) is increasing.'' Kan warned the public at a press conference, while asking people to ''act calmly.''

Chief Cabinet Secretary Yukio Edano said the high radiation level detected at 10:22 a.m. after the explosions at the No. 2 and No. 4 reactors ''would certainly have negative effects on the human body.''

The plant operator Tokyo Electric Power Co. said the problem could develop into a critical ''meltdown'' situation after part of the No. 2 reactor's container vessel was damaged following the apparent hydrogen explosion at 6:10 a.m.

TEPCO ordered some workers at the site to temporarily evacuate the area, but the utility has been continuing operations to pour seawater into the troubled No. 2 reactor to prevent overheating and further damage to its container.

The possibility of a meltdown, in which fuel rods melt and are destroyed, ''cannot be ruled out'' as the fuel rods have been damaged, the utility said.

Also, a fire occurred around 9:40 a.m. at the plant's No. 4 reactor, where spent nuclear fuels are stored, but it was extinguished later, according to TEPCO. Edano said it was likely caused by another hydrogen explosion.

The nuclear agency said the explosion at the No. 2 reactor may have damaged the ''suppression chamber,'' a facility connected to the reactor's container which is designed to cool down radiation steam and lower the pressure in the reactor. It said a sharp decline in the pressure level of the chamber suggests damage.

Given that the building that houses the No. 2 reactor has already been damaged by Monday's hydrogen blast at the neighboring No. 3 reactor, a spread of radiation outside the plant has become a serious threat, experts say.

In Ibaraki Prefecture, just south of Fukushima, an amount of radiation up to about 100 times the usual level was measured Tuesday morning. In Kanagawa Prefecture, southwest of Tokyo, radiation of up to nine times the normal level was also briefly detected.

The Tokyo metropolitan government also said it has detected a small amount of radioactive materials such as iodine and cesium in the air of the metropolis.

The wind was blowing from north to south when the incidents occurred at the Fukushima plant.

The cores of the No. 1, No. 2 and No. 3 reactors at the plant are believed to have partially melted following Friday's magnitude 9.0 earthquake that hit northeastern and eastern Japan.

The country's biggest recorded quake, which is also one of the largest in global history, caused the three reactors, which were all operating at the time, to automatically shut down. The No. 4 reactor and two others at the plant were not then in service.

Earlier in the day, the government and TEPCO set up an integrated headquarters, headed by Kan, to tackle the nuclear crisis.

''A worrisome situation remains but I hope to take the lead in overcoming this crisis,'' Kan said of the nuclear power plant. ''I will take all measures so that damage will not expand.''

At the headquarters set up at the TEPCO head office, Kan confronted TEPCO officials about their delay in reporting an earlier blast.

The development follows hydrogen blasts at both of the plant's No. 1 and No. 3 reactors on Saturday and Monday.

The cooling system for the No. 2 reactor broke down on Monday, causing water levels to rapidly fall and fully exposing its fuel rods for several hours.

As of 6:28 a.m., the water level had recovered to cover about 1.2 meters of the fuel rods, about one-third of their height, TEPCO said.

Meanwhile, the No. 4 reactor of TEPCO's Fukushima No. 2 nuclear plant, which is adjacent to the No. 1 plant, has successfully cooled down, meaning the plant no longer has a reactor in an emergency situation after three of its four reactors were once in that state after the quake, the firm said.

Japan has asked the United States to provide more cooling equipment to help deal with the crisis, Gregory Jaczko, chairman of the U.S. Nuclear Regulatory Commission, said in Washington. The NRC has already sent two technological experts and is fully supporting Japanese efforts, he said.

este texto so prova o que eu disse.

[amon.rosa]

Tem uma boa noite

[MarcoAntonio]

Entretanto mais info actualizada...

Radiation Leak Feared At Nuke Plant, People Urged To Stay Indoors

TOKYO (Kyodo)--The crisis at the quake-hit Fukushima No. 1 nuclear plant reached a critical phase Tuesday with radiation feared to have leaked after apparent hydrogen blasts at two more reactors, triggering growing fears of widespread contamination.

Prime Minister Naoto Kan urged people living between 20 and 30 kilometers of the plant to stay indoors, after radiation equivalent to 400 times the level to which people can safely be exposed in one year was detected near the No. 3 reactor in the plant.

Residents within a 20-km radius have already been ordered to vacate the area following Saturday's hydrogen blast at the plant's No. 1 reactor.

''The danger of further radiation leaks (from the plant) is increasing.'' Kan warned the public at a press conference, while asking people to ''act calmly.''

Chief Cabinet Secretary Yukio Edano said the high radiation level detected at 10:22 a.m. after the explosions at the No. 2 and No. 4 reactors ''would certainly have negative effects on the human body.''

The plant operator Tokyo Electric Power Co. said the problem could develop into a critical ''meltdown'' situation after part of the No. 2 reactor's container vessel was damaged following the apparent hydrogen explosion at 6:10 a.m.

TEPCO ordered some workers at the site to temporarily evacuate the area, but the utility has been continuing operations to pour seawater into the troubled No. 2 reactor to prevent overheating and further damage to its container.

The possibility of a meltdown, in which fuel rods melt and are destroyed, ''cannot be ruled out'' as the fuel rods have been damaged, the utility said.

Also, a fire occurred around 9:40 a.m. at the plant's No. 4 reactor, where spent nuclear fuels are stored, but it was extinguished later, according to TEPCO. Edano said it was likely caused by another hydrogen explosion.

The nuclear agency said the explosion at the No. 2 reactor may have damaged the ''suppression chamber,'' a facility connected to the reactor's container which is designed to cool down radiation steam and lower the pressure in the reactor. It said a sharp decline in the pressure level of the chamber suggests damage.

Given that the building that houses the No. 2 reactor has already been damaged by Monday's hydrogen blast at the neighboring No. 3 reactor, a spread of radiation outside the plant has become a serious threat, experts say.

In Ibaraki Prefecture, just south of Fukushima, an amount of radiation up to about 100 times the usual level was measured Tuesday morning. In Kanagawa Prefecture, southwest of Tokyo, radiation of up to nine times the normal level was also briefly detected.

The Tokyo metropolitan government also said it has detected a small amount of radioactive materials such as iodine and cesium in the air of the metropolis.

The wind was blowing from north to south when the incidents occurred at the Fukushima plant.

The cores of the No. 1, No. 2 and No. 3 reactors at the plant are believed to have partially melted following Friday's magnitude 9.0 earthquake that hit northeastern and eastern Japan.

The country's biggest recorded quake, which is also one of the largest in global history, caused the three reactors, which were all operating at the time, to automatically shut down. The No. 4 reactor and two others at the plant were not then in service.

Earlier in the day, the government and TEPCO set up an integrated headquarters, headed by Kan, to tackle the nuclear crisis.

''A worrisome situation remains but I hope to take the lead in overcoming this crisis,'' Kan said of the nuclear power plant. ''I will take all measures so that damage will not expand.''

At the headquarters set up at the TEPCO head office, Kan confronted TEPCO officials about their delay in reporting an earlier blast.

The development follows hydrogen blasts at both of the plant's No. 1 and No. 3 reactors on Saturday and Monday.

The cooling system for the No. 2 reactor broke down on Monday, causing water levels to rapidly fall and fully exposing its fuel rods for several hours.

As of 6:28 a.m., the water level had recovered to cover about 1.2 meters of the fuel rods, about one-third of their height, TEPCO said.

Meanwhile, the No. 4 reactor of TEPCO's Fukushima No. 2 nuclear plant, which is adjacent to the No. 1 plant, has successfully cooled down, meaning the plant no longer has a reactor in an emergency situation after three of its four reactors were once in that state after the quake, the firm said.

Japan has asked the United States to provide more cooling equipment to help deal with the crisis, Gregory Jaczko, chairman of the U.S. Nuclear Regulatory Commission, said in Washington. The NRC has already sent two technological experts and is fully supporting Japanese efforts, he said.

[MarcoAntonio]

Repara eu referi os Açores.. claro que não há provas....

Sabes perfeitamente que te estou a pedir informação relevante relativamente à situação que decorre no Japão, sobre a qual dizes que é evidente o que se está a passar e só um cego não vê.

Não desconverses...

Eu não pretendo adicionar nada, além da história que me contam, mas não pretendo contar rapsódias...

Estamos esclarecidos!

[amon.rosa]

Repara eu referi os Açores.. claro que não há provas.... logo deixa de ser verdadeiro... Mas pergunta tu isso a um acoreano? Onde está isso retratado? Não está? então é falso!... e nãas o é bem assim!
Eu não pretendo adicionar nada, além da história que me contam, mas não pretendo contar rapsódias...
Detectar a ignorancia é uma virtude... mas já dizia numa das palavras sagradas "veste-te de jumento e a ti será te dado o reino dos céus" ...
que seja jumento... e agora entendes o meu sorriso a minha "jumentaria"... e sorrio pelos sábios... e pelo jumento que sou )))

[MarcoAntonio]

Marco, pela maneira como falas, ate parece que nao aconteceu nada lol.

Confessa lá que não estás a ler nada do que eu estou a colocar...

[sombrio]

Marco, pela maneira como falas, ate parece que nao aconteceu nada lol.

[MarcoAntonio]

Nem tudo que se conta é contável e nem tudo o que é contável se conta...

Isso é a tua forma de dizer que não tens nada de substantivo para acrescentar?

esse talvez seja o teu erro Marco..

Qual erro?

Eu nada posso dizer sobre os efeitos da radiação (não sou perito... e humildemente sou ignorante na área...

O meu erro portanto é o de tentar analisar objectivamente a informação disponível em lugar de embalar na tua opinião baseada no gosto pessoal, a qual tu entendes que todos deveriam ver?

mas também reconheço que não canto raposódias...) eu o que posso dizer é que já vi 4 explosões, vejo hoje o nikkei mais tenso... e que se vivesse lá estaria com medo...

Mas gostaria de ouvir os argumentos que tchernobil teve uma gravidade pior, se nem os peritos (supostamente) ainda não conseguiram avaliar como estão os reactores... 4 explosões... estas são reais.. o fumo ou vapor também são reais...

Porque insistes em contar explosões se admites a tua ignorância sobre o tema?

[amon.rosa]

Nem tudo que se conta é contável e nem tudo o que é contável se conta...e depois ainda há aqueles que contam o que foi contável, como de uma história se tratasse... Realmente a história do mundo sempre foi retratada por quem a contou.. e nunca pelo aconteceu, esse talvez seja o teu erro Marco.. Eu nada posso dizer sobre os efeitos da radiação (não sou perito... e humildemente sou ignorante na área... mas também reconheço que não canto raposódias...) eu o que posso dizer é que já vi 4 explosões, vejo hoje o nikkei mais tenso... e que se vivesse lá estaria com medo...

Mas gostaria de ouvir os argumentos que tchernobil teve uma gravidade pior, se nem os peritos (supostamente) ainda não conseguiram avaliar como estão os reactores... 4 explosões... estas são reais.. o fumo ou vapor também são reais...

[MarcoAntonio]

: )

É notável que se consiga sorrir perante uma situação que se considera tão grave como a que escreveste acima...

Uma forma estranha de wishfull thinking!

[MarcoAntonio]

Só pior que um cego é aquele que não quer ver,,,

Queres deixar informação factual que nos ajude a ver (como eu tenho feito por exemplo) com indicações dos níveis de radiação e outra informação relevante?

só quero ver se os reactores entram em fusão... Que consequências para o japão?

As consequências podem ser variadas. Se a medida for Chernobyl, é bastante improvável que venha a ser semelhante...

É evidente que o que está acontecer com as centrais nucleares nem tudo vem a publico, porque seria o caos no país!

Mais uma vez, queres apresentar as evidências?

E que consequências a nível mundial?

As consequências a nível mundial deverão ser virtualmente nulas...

Recordo que a radiação de tchernobli foi sentida em toda a europa..

O que se passa no Japão neste momento não é directamente comparável com o que ocorreu em Chernobyl a uma data de níveis.

[amon.rosa]

nikkei já cai 13.5%... também deve ser coincidência ninguém está assustado....

[amon.rosa]

Só pior que um cego é aquele que não quer ver,,, muito fiel ao nuclear.. só quero ver se os reactores entram em fusão... Que consequências para o japão?
É evidente que o que está acontecer com as centrais nucleares nem tudo vem a publico, porque seria o caos no país!
E que consequências a nível mundial? Recordo que a radiação de tchernobli foi sentida em toda a europa..
Será que o raio do país é assim tão grande?
Mais recordo... para quem não sabe que nos Açores dizem as populações que os americanos contaminaram os açores com radiações, nunca se soube nada, o certo é que os açores têm uma taxa elevada de Cancro da Tiroide... Coincidências

[Lion_Heart]

os 3 reactores estao fora de controlo, e a situacao do ultimo que explodiu é mesmo grave.

Não sei como vai ser , mas a situação para mim esta fora de controle.

E quando se trata de uma central nuclear nunca é boa coisa.

Marco, quanto ao raio de 30km devo ter percebido mal, era para as pessoas se manterem em casa, mas se fosse eu não ficava la.

[MarcoAntonio]

os 3 reactores estao fora de controlo, e a situacao do ultimo que explodiu é mesmo grave.

A situação não é nada comparável a Chernobyl.

Entre as autoridades com competências sobre a matéria a mais pessimista é a Agência Nuclear francesa e mesmo essa coloca Chernobyl numa ordem magnitude que é 10 a 100 vezes pior.

Os americanos não parecem tão pessimistas (já ignorando os japoneses).


Em que é que se traduz ao certo "a situacao do ultimo que explodiu é mesmo grave"? Tecnicamente isso traduz-se em quê?

[sombrio]

os 3 reactores estao fora de controlo, e a situacao do ultimo que explodiu é mesmo grave.

[MarcoAntonio]

fdxx, este desastre ainda vai ser pior que o de chernobyl

Isso baseia-se em?...

[sombrio]

fdxx, este desastre ainda vai ser pior que o de chernobyl