Terremoto in Giappone 11 marzo 2011: cause, eventi e conseguenze

[ConteZero]

Buone notizie dall'impianto di purificazione delle acque di Tokyo:

Radiation levels in tap water at a Tokyo water purification plant declined further Friday, remaining within the normal range for consumption, the Tokyo metropolitan government said.

The local government's Bureau of Waterworks detected 51 becquerels of radioactive iodine per kilogram of water, sampled Friday morning, at the Kanamachi water purification plant in the capital's Katsushika Ward.

The figure is below 100 becquerels, the central government's safe limit for consumption by infants. It is also below the safe limit for adults at 300 becquerels, the local government said.

At the Kanamachi plant, the waterworks bureau detected 210 becquerels Tuesday and 190 becquerels Wednesday, leading the metropolitan government to issue on Wednesday an advisory for people in Tokyo's 23 wards and five of its suburban cities -- Musashino, Mitaka, Machida, Tama and Inagi -- not to let infants drink tap water.

The metropolitan government lifted the advisory Thursday following a decline in the radiation levels to 79 becquerels.

The rise in the radiation levels in Tokyo's tap water is apparently linked with the crippled Fukushima Daiichi nuclear power station which was damaged by the March 11 killer earthquake and tsunami. The nuclear power plant run by Tokyo Electric Power Co. is located some 220 kilometers northeast of central Tokyo.

On Thursday, water with radiation levels considered to be unsafe for infants was found at several purification plants outside of Tokyo as well, such as Hitachi in Ibaraki Prefecture and Matsudo in Chiba Prefecture.

[Dumah Brazorf]

Originariamente inviato da ConteZero

Oh, per nota, il governo giapponese ha detto agli abitanti nella fascia fra i 20 ed i 30 km dalla centrale che è meglio che si trasferiscano altrove.
Non è un ordine perentorio ma è caldamente consigliato.

Sì, visti i tempi che si prospettano farebbero bene a trasferirsi definitivamente.

[frankytop]

Originariamente inviato da pirandello

La presenza di nucleotidi radioattivi misurata nell'aria nel giorno 23/03/2011 è risultata come invariata per il cesio-137 ed invece il doppio del normale per lo iodio-131, comunque nei limiti del trascurabile.

Queste misurazioni si riferiscono alle masse d'aria che seguono agli incidenti dei primissimi giorni, ma le emissioni da Fukushima persistono a tutt'oggi, percui è plausibile aspettarsi ulteriori sviluppi (pur di verosimilmente entità non differente).



I dati sono dell'ente ministeriale italiano per la tutela dell'ambiente.

In serata mi aspetto le rilevazioni su di ieri, che dovrebbe esser stato più colpito rispetto al giorno 23.

Il fatto comunque un incidente definito di "gravità locale" mostri i suoi effetti anche a 10.000 km di distanza, ovvero dalla parte opposta del globo, dovrebbe però essere un momento di riflessione (non intesa politicamente), anche per i pro-nucleare, sulla necessità di un ente di controllo indipendente ed internazionale.

Non c'è nessun effetto.Il fatto che esista qualche atomo radioattivo "svolazzante" con densità inconsistente nell'atmosfera non significa che la sua presenza determini effetti.

E' molto più significativa la radioattività naturale.(per non parlare del cesio sparpagliato a seguito delle bombe nucleari fatte esplodere negli anni 50' e forse anche 60' nell'atmosfera)

[ConteZero]

Originariamente inviato da frankytop

Non c'è nessun effetto.Il fatto che esista qualche atomo radioattivo "svolazzante" con densità inconsistente nell'atmosfera non significa che la sua presenza determini effetti.

E' molto più significativa la radioattività naturale.(per non parlare del cesio sparpagliato a seguito delle bombe nucleari fatte esplodere negli anni 50' e forse anche 60' nell'atmosfera)

Non sono effetti deleteri, ma sono comunque presenti e verificabili.

[ConteZero]

High-level radiation detected Thursday in water at the No. 3 reactor's turbine building at the crisis-hit Fukushima Daiichi nuclear plant appears to have originated from the reactor core, the government's Nuclear and Industrial Safety Agency said Friday.

But no data, such as on the pressure level, have suggested the reactor vessel has been cracked or damaged, agency spokesman Hidehiko Nishiyama emphasized at an afternoon press conference, backing down from his previous remark that there is a good chance that the reactor has been damaged. It remains uncertain how the leakage happened, he added.

A day after three workers were exposed Thursday to water containing radioactive materials 10,000 times the normal level at the turbine building connected to the No. 3 reactor building, highly radioactive water was found also at the No. 1 and No. 2 reactors' turbine buildings.

The latest development in Japan's worst nuclear crisis raises the risk of more workers being exposed to radioactive elements, hampering their efforts to restore the plant's crippled cooling functions that are key to putting the crisis under control.

The three workers were transferred to the National Institute of Radiological Sciences in Chiba Prefecture Friday afternoon, after two of them were taken Thursday to a Fukushima hospital for possible radiation burns to their feet, the plant operator Tokyo Electric Power Co. said.

Following the incident, the nuclear regulatory agency ordered the utility known as TEPCO to improve radiation management at the power station, located about 220 kilometers northeast of Tokyo.

Nishiyama said the high-level radiation is suspected to have come from the reactor, where overheating fuel rods are believed to have partially melted.

He said further verification is needed to find out how the radioactive water reached the underground site where the workers were exposed. Huge volumes of water have been poured into the reactor as well as its apparently boiling spent fuel pool since they lost their cooling functions.

The government, which has set the exclusion zone covering areas within a 20 kilometer radius of the Fukushima plant, meanwhile, encouraged residents within a 30 kilometer radius of the power station to voluntarily leave, while the official directive is for them to stay indoors.

The Nuclear Safety Commission of Japan, a government panel, recommended voluntary evacuation as the release of radioactive materials from the plant is expected to continue for some time.

Despite the partial halt of restoration work due to the technicians' radiation exposure, TEPCO on Friday began injecting freshwater into the No. 1 reactor core, as it prepares to inject freshwater into all the troubled three reactor cores and four spent fuel pools, instead of seawater currently used.

As a step to bring the reactors under control, authorities are eager to replace seawater with fresh water in cooling the reactor cores and the pools, as crystallized salt could form a crust on the fuel rods and prevent smooth water circulation, thus diminishing the cooling effect.

Defense Minister Toshimi Kitazawa told a news conference Friday that U.S. forces in Japan will provide some freshwater to be sprayed at the fuel pools to ensure ample water supply. TEPCO currently uses freshwater from a dam near the plant.

Following the March 11 quake-tsunami disaster, the cooling functions failed at the No. 1, No. 2 and No. 3 reactors and their reactor cores partially melted at the plant on the Pacific coast, prompting seawater to be pumped in to prevent the fuel from being exposed.

The cooling functions of the pools storing spent nuclear fuel at the three units, as well as at the No. 4 unit, were also lost. The No. 4 reactor, halted for a regular inspection before the quake, has had all of its fuel rods stored in the pool for the maintenance work.

The nuclear agency said black smoke, which had been observed intermittently, stopped billowing from the No. 3 reactor building Friday morning, but that white smoke, possibly steam, is still seen rising from the No. 1, No. 2 and No. 4 units.

Se non la smettono di dare le notizie in questa maniera finisce che comincio a gufargliela...

[frankytop]

Originariamente inviato da ConteZero

Non sono effetti deleteri, ma sono comunque presenti e verificabili.

La rilevabilità ha interesse esclusivamente scientifico ma non ha interesse sul piano medico.

[ConteZero]

Originariamente inviato da frankytop

La rilevabilità ha interesse esclusivamente scientifico ma non ha interesse sul piano medico.

Relativamente.
Qui non ha rilevanza medica, ma siamo anche dall'altra parte del mondo.
C'è da vedere se "altrove" in posti un po'meno lontani (tipo negli USA) la storia non è già diversa.

[frankytop]

Originariamente inviato da ConteZero

Relativamente.
Qui non ha rilevanza medica, ma siamo anche dall'altra parte del mondo.
C'è da vedere se "altrove" in posti un po'meno lontani (tipo negli USA) la storia non è già diversa.

Gli Usa continuano ad essere dall'altra parte del mondo.



L'Oceano Pacifico è immenso e dubito parecchio che ci possa essere una corrente atmosferica così collimata da dirigere la nube in una zona specifica degli USA.

[X360X]

sul terremoto della birmania non credo ci siano altre notizie (75 morti e decine di feriti), speriamo che il bilancio non peggiori, nel caso penso che vada bene usare questo thread per aggiornare sulla situazione.

[litocat]

Altro terremoto di magnitudo 6.2...

[Ziosilvio]

Originariamente inviato da X360X

sul terremoto della birmania non credo ci siano altre notizie (75 morti e decine di feriti), speriamo che il bilancio non peggiori, nel caso penso che vada bene usare questo thread per aggiornare sulla situazione.

No, non va bene, perché i due eventi sono scollegati.
Se si vuole, si può aprire un thread apposta, evitando complottismi, "sono stati gli americani con HAARP", e affini.

[X360X]

Originariamente inviato da Ziosilvio

No, non va bene, perché i due eventi sono scollegati.
Se si vuole, si può aprire un thread apposta, evitando complottismi, "sono stati gli americani con HAARP", e affini.

si ho letto che non c'è collegamento

il thread apposito però è inutile (e a rischio post dei "complottisti"), al massimo si può venire a sapere che purtroppo ci sono più morti/feriti e come stanno messi nei soccorsi, per quello pensavo che un post ogni tanto quì andasse bene. sorry

edit
inutile nel senso che non ci sarebbe una discussione sopra ma solo sporadiche notizie di aggiornamento

[ConteZero]

I reattori "perdono"...

Tokyo Electric Power Co. said Friday it has begun injecting freshwater into the No. 1 and No. 3 reactor cores at the crisis-hit Fukushima Daiichi nuclear plant to enhance cooling efficiency, but highly radioactive water was later found leaking near all four troubled reactor units at the plant.

A day after three workers were exposed to water containing radioactive materials 10,000 times the normal level at the turbine building connected to the No. 3 reactor building, a water pool with similarly highly concentrated radioactive materials was found in the No. 1 reactor's turbine building, causing some restoration work to be suspended, it said.

Pools of water that may have seeped from either the reactor cores or spent fuel pools were also found in the turbine buildings of the No. 2 and No. 4 reactors, measuring up to 1 meter and 80 centimeters deep, respectively, while those near the No. 1 and No. 3 reactors were up to 40 cm and 1.5 meters deep.

The latest development in Japan's worst nuclear crisis raises the risk of more workers being exposed to radioactive substances, hindering their efforts to restore the plant's crippled cooling functions that are key to overcoming the crisis.

The No. 3 reactor is different from the others in that it was using plutonium-uranium mixed oxide fuel for so-called ''pluthermal'' power generation when it and two other operating reactors at the plant automatically shut down in the wake of the March 11 megaquake and tsunami. The No. 4 reactor was undergoing maintenance and not in service.

Freshwater is being injected to prevent crystallized salt from seawater already injected forming a crust on the fuel rods and hampering smooth water circulation, thus diminishing the cooling effect, the utility known as TEPCO said, adding it is preparing to inject freshwater into the No. 2 reactor core as well on Saturday.

Prime Minister Naoto Kan said at a press conference Friday evening that the situation at the plant involving leaks of radioactive materials and other serious problems ''still does not warrant optimism.''

He failed to address what the Japanese people and the international community most want to know -- whether the ongoing crisis will be brought under control soon -- only saying that the government is putting all its efforts into preventing a worsening of the situation.

Early Friday, concern grew that the high-level radiation leak detected with the workers' exposure Thursday could indicate possible damage to the No. 3 reactor vessel, but the government's nuclear safety agency later denied the possibility, saying no data, such as on the pressure level, have suggested the reactor vessel has cracked or been damaged.

While the high-level radiation is suspected to have come from the reactor, where overheating fuel rods are believed to have partially melted, it remains uncertain how the leak occurred, said Hidehiko Nishiyama, spokesman for the government's Nuclear and Industrial Safety Agency.

He said further verification is needed to find out how the radioactive water reached the underground site where the workers were exposed. Huge volumes of water have been poured into the No. 3 reactor as well as its apparently boiling spent fuel pool since they lost their cooling functions.

The three workers were transferred to the National Institute of Radiological Sciences in Chiba Prefecture on Friday afternoon, and two of them, who were hospitalized the day before for possible burns, were found likely to have suffered internal radiation exposure, the institute said, adding, however, that they have not shown early symptoms and do not require treatment.

''There were problems regarding radiation management. We will strengthen management further,'' Tokyo Electric Executive Vice President Sakae Muto said separately.

Despite the partial halt of restoration work due to the technicians' radiation exposure, TEPCO continued to make efforts to cool the overheating reactors and spent fuel pools.

In addition to the infusion of freshwater to the No. 1 and No. 3 reactors, it injected seawater to the spent fuel pools of the No. 2 and No. 4 reactors through pipes, and firefighters sprayed a massive amount of seawater onto the No. 3 fuel pool, the utility said.

The government, meanwhile, encouraged residents within 20 to 30 kilometers of the plant to leave voluntarily, citing concerns over access to daily necessities, while maintaining its directives for them to remain indoors and for residents within 20 km of the plant to evacuate.

The Nuclear Safety Commission of Japan, a government panel, also recommended voluntary evacuation as the release of radioactive materials from the plant is expected to continue for some time.

Following the March 11 quake and tsunami, the cooling functions failed at the No. 1, No. 2 and No. 3 reactors and their reactor cores partially melted at the plant on the Pacific coast around 220 km northeast of Tokyo, prompting seawater to be pumped in to prevent the fuel from being exposed.

The cooling functions of the pools storing spent nuclear fuel at the three units, as well as at the No. 4 unit, were also lost. The No. 4 reactor, halted for a regular inspection before the quake, had all of its fuel rods stored in the pool for the maintenance work.

[bjt2]

Originariamente inviato da ChristinaAemiliana

Sì, e andiamo a vivere in una bella caverna piena di Radon!

Mi scordo sempre di prendere in prestito ( ) il geiger della medicina nucleare per vedere se la mia casa (che è fatta parzialmente di tufo) ha molto radon e magari dare una occhiata in giardino per vedere se i precedenti proprietari ci hanno seppellito qualcosa...

[ConteZero]

Originariamente inviato da bjt2

Mi scordo sempre di prendere in prestito ( ) il geiger della medicina nucleare per vedere se la mia casa (che è fatta parzialmente di tufo) ha molto radon e magari dare una occhiata in giardino per vedere se i precedenti proprietari ci hanno seppellito qualcosa...

I rilevatori di Radon li vendono un po'ovunque e servono proprio a quello.

[LUVІ]

http://www.ilfattoquotidiano.it/2011...rnobyl/100032/

[Maverick18]

Originariamente inviato da LUVІ

http://www.ilfattoquotidiano.it/2011...rnobyl/100032/

Lo stavo per postare io.

Senza parole..., cioè di parole di ne avrei ma meglio evitare.

[Futura12]

Sono arrivati alla frutta,proprio come pensavo.
Il disastro se non è pari a quello di Chernobyl ogni giorno gli si avvicina di più...le famose parole ''una centrale nucleare è un impianto sicuro e che si può tenere sotto controllo'',infatti si sono visti i risultati.

[Ziosilvio]

Originariamente inviato da LUVІ

http://www.ilfattoquotidiano.it/2011...rnobyl/100032/

http://st.ilfattoquotidiano.it/wp-co..._fukushima.jpg

Originariamente inviato da Maverick18

Lo stavo per postare io.

Senza parole..., cioè di parole di ne avrei ma meglio evitare.

EDIT: sbagliato io a interpretare.

Originariamente inviato da Futura12

Sono arrivati alla frutta,proprio come pensavo.
Il disastro se non è pari a quello di Chernobyl ogni giorno gli si avvicina di più...le famose parole ''una centrale nucleare è un impianto sicuro e che si può tenere sotto controllo'',infatti si sono visti i risultati.

E così, secondo mia opinione personale, Fukushima è stata per quasi quarant'anni, finché non è arrivato un terremoto di entità mai registrata prima con annesso tsunami.

[fendermexico]

Vienna, 25 mar. (Adnkronos/Dpa) - L'Agenzia internazionale per l'energia atomica ha detto di non sapere quando i tecnici giapponesi saranno in grado di arrestare le perdite radioattive dall'impianto nucleare di Fukushima, sebbene la probabile fonte delle emissioni sia stata individuata. "Non sappiamo quanto dureranno queste perdite", ha detto a Vienna il consulente tecnico dell'Aiea Graham Andrew.


che cosa brutta...