anda1
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anda link a spus:
se pare ca nu sint singura revoltata
http://www.cotidianul.ro/140338-Nu-e-nici-iad-nici-apocalipsa-Aici-nimeni-nu-s-a-batut-pe-zahar
-
Bine ati venit! Acesta este noul server al forumului Cutremur.net!
Fukushima 2011
- Autor subiect anda1
- Dată creare
se pare ca nu sint singura revoltata
http://www.cotidianul.ro/140338-Nu-e-nici-iad-nici-apocalipsa-Aici-nimeni-nu-s-a-batut-pe-zahar
Alin Todor
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[font=Verdana,]
[font=Verdana,]Ultimele informatii despre contaminarea radioactiva in Tokio[/font]
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[/font]Radiation leaked from a crippled nuclear plant in tsunami-ravaged northeastern Japan after a third reactor was rocked by an explosion Tuesday and a fourth caught fire in a dramatic escalation of the 4-day-old catastrophe. The government warned anyone nearby to stay indoors to avoid exposure. Tokyo reported slightly elevated radiation levels but officials said the increase was too small to threaten anyone in the capital. In a nationally televised statement, Prime Minister Naoto Kan said radiation has spread from four reactors of the Fukushima Dai-ichi nuclear plant in Fukushima province, one of the hardest-hit in Friday's 9.0-magnitude earthquake and the ensuing tsunami that has killed more than 10,000 people.[/font]
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[font=Verdana,]Situation Update No. 1
On 19.03.2011 at 14:49 GMT+2
Public health fears were raised after traces of radioactive iodine were found in Tokyo's tap water Saturday and Japanese authorities stopped food sales in the areas around the Fukushima nuclear plant. Government sources told Kyodo News that radioactive iodine reached the water supply of the country's capital -- home to 36 million people -- in the wake of the emergency at the quake-hit Fukushima No. 1 power plant. Abnormal levels of radioactive iodine were also found in the water supply in the central prefectures of Gunma, Tochigi, Saitama, Chiba and Niigata, an official at Japan's science ministry told AFP. But the levels were far below Japan's legal limit, added the official, who did not want to be named. A 5.9 magnitude earthquake rattled Japan's Ibaraki Prefecture south of the stricken Fukushima No 1 nuclear plant late last night, the US Geological Survey said, but no tsunami warning was issued.[/font]
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[/font]
[font=Verdana,]Sursa[/font]
[font=Verdana,]Ultimele informatii despre contaminarea radioactiva in Tokio[/font]
[font=Verdana,]
[/font]Radiation leaked from a crippled nuclear plant in tsunami-ravaged northeastern Japan after a third reactor was rocked by an explosion Tuesday and a fourth caught fire in a dramatic escalation of the 4-day-old catastrophe. The government warned anyone nearby to stay indoors to avoid exposure. Tokyo reported slightly elevated radiation levels but officials said the increase was too small to threaten anyone in the capital. In a nationally televised statement, Prime Minister Naoto Kan said radiation has spread from four reactors of the Fukushima Dai-ichi nuclear plant in Fukushima province, one of the hardest-hit in Friday's 9.0-magnitude earthquake and the ensuing tsunami that has killed more than 10,000 people.[/font]
[font=Verdana,]
[/font]
[font=Verdana,]Situation Update No. 1
On 19.03.2011 at 14:49 GMT+2
Public health fears were raised after traces of radioactive iodine were found in Tokyo's tap water Saturday and Japanese authorities stopped food sales in the areas around the Fukushima nuclear plant. Government sources told Kyodo News that radioactive iodine reached the water supply of the country's capital -- home to 36 million people -- in the wake of the emergency at the quake-hit Fukushima No. 1 power plant. Abnormal levels of radioactive iodine were also found in the water supply in the central prefectures of Gunma, Tochigi, Saitama, Chiba and Niigata, an official at Japan's science ministry told AFP. But the levels were far below Japan's legal limit, added the official, who did not want to be named. A 5.9 magnitude earthquake rattled Japan's Ibaraki Prefecture south of the stricken Fukushima No 1 nuclear plant late last night, the US Geological Survey said, but no tsunami warning was issued.[/font]
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[font=Verdana,]Sursa[/font]
anda1
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Gray smoke spews from No. 3 reactor at stricken Japanese nuclear plant
Tokyo (CNN) -- Gray smoke spewed Monday out of the Fukushima Daiichi nuclear power plant's No. 3 reactor, a setback that came despite fervent efforts to prevent the further release of radioactive materials at the stricken facility.
Those who had been working nearby were evacuated to safety shortly after the smoke was spotted around 4 p.m. Monday, a Tokyo Electric Power Company official told reporters.
This is the same reactor that has been authorities' top priority -- and concern -- in recent days.
A Japanese nuclear and industrial safety official estimated that, between roughly 9 p.m. Sunday to 4 a.m. Monday, 1,170 tons of water were sprayed on the reactor and its overheating nuclear spent fuel pool to guard against overheating. Authorities fear that the evaporation of water might further expose fuel rods and release more radioactive vapors.
Experts track fallout from Fukushima Why spent fuel rods should matter to you Lawmaker: Japan's government doesn't lie
Explainer: Producing nuclear energy
Earlier, officials said that they were monitoring that reactor to determine whether to release gas in order to reduce mounting pressure in the containment vessel. The pressure buildup, specifically from excess hydrogen gas, had caused explosions at that reactor and at the Nos. 1 and 2 reactors. Late last week, three holes apiece were drilled into the Nos. 5 and 6 reactors in order to alleviate pressure.
This development came shortly after a Tokyo Electric official told CNN that electrical cables had been laid to connect the No. 3 reactor and the neighboring No. 4 reactor with an outside power source.
That meant that power could now be funneled to all six of the plant's reactors for its cooling systems. But electricity was still not moving to Nos. 1, 2, 3 and 4, because the March 11 mammoth earthquake and subsequent tsunami -- including seawater that had rushed into the reactors -- had damaged numerous pumps and other apparatus. The Tokyo Electric official said that spare parts were being brought in, so that everything could work again.
The disaster has killed more than 8,600 people and left more than 13,000 missing, many of them killed soon after a wall of water rushed in with the tsunami. Ever since, authorities have been work to avert further crisis -- and prevent more deaths -- at the Fukushima Daiichi plant, some 240 kilometers (150 miles) north of Tokyo.
Those efforts include a move to possibly encase one or more of the reactors in concrete, a last-ditch effort similar to what was done after the 1986 meltdown at the Chernobyl nuclear plant in the former Soviet Union -- considered the worst nuclear disaster at a plant.
On Monday, an official with Japan's nuclear and industrial safety agency told reporters that tests are expected to be conducted in the afternoon on how to use what he called a "concrete pump engine."
The engine would pump a mix of mortar and water into the reactor's spent nuclear fuel pool and containment vessel, the official said. The pool contains nuclear fuel rods that could give off radioactive material, if exposed and overheated, while the containment vessel is a steel and concrete shell that insulates radioactive material inside.
CNN reporter reflects on tsunami damage Pouring tons of water on power plant TEPCO official reports on power plant
While he did not indicate when or even if the concrete pump would be used, the official did say the target would be the plant's No. 4 reactor. In just over two hours on Monday morning alone, 13 fire engines sprayed about 90 tons toward that reactor in an attempt to cool it down.
A Tokyo electric official told CNN that six workers trying to restore electricity to that reactor have been exposed to more than 100 millisieverts of radiation. For reference, an individual in a developed country naturally is exposed to 3 millisieverts of radiation a year -- though Japan's health industry has set a 250 millisievert limit for those trying to combat the crisis at the Fukushima plant.
These efforts came as concerns remained high about the impact that already emitted radiation has had on food, water and people within range of the Fukushima facility.
Very small amounts -- far below the level of concern -- of radioactive iodine have been detected in tap water in Tokyo and most prefectures near the plant.
The health ministry said levels of radioactive iodine three times greater than the regulated standard were found in drinking water in a village near the plant and asked residents not to drink from the tap, Kyodo News reported Sunday.
The Japanese government has banned the sale of raw milk from Fukushima Prefecture, where the plant is located, and prohibited the sale of spinach from neighboring Ibaraki Prefecture after finding levels of radioactive iodine and cesium higher than government standards, the country's health ministry reported. And officials in Fukushima halted the distribution of locally grown vegetables outside the prefecture.
Edano said the contaminated milk detected in Fukushima Prefecture had not been distributed or sold.
On Saturday, officials said tainted milk was found 30 kilometers (18 miles) from the plant, and spinach was collected as far as 100 kilometers (65 miles) to the south, almost halfway to Tokyo.
The latest results accumulated and posted online by Japan's education, science and technology ministry showed slight but notable upticks in airborne radiation readings around Japan in recent days. But even the highest readings, .11 millisieverts some 30 kilometers northwest of the plant, were still considered significantly below what's considered dangerous to humans.
Nature has helped to minimize such airborne exposure since the quake, as winds from the northwest have blown many emissions from the plant out to sea.
But the wind direction is expected to change through Wednesday, potentially pushing more of the material to the southwest and over land.
"People are watching," said Akira Shioi, who lives in Kawasaki. "And people have greater concern than ever about the nuclear power plant incident."
Sursa
Tokyo (CNN) -- Gray smoke spewed Monday out of the Fukushima Daiichi nuclear power plant's No. 3 reactor, a setback that came despite fervent efforts to prevent the further release of radioactive materials at the stricken facility.
Those who had been working nearby were evacuated to safety shortly after the smoke was spotted around 4 p.m. Monday, a Tokyo Electric Power Company official told reporters.
This is the same reactor that has been authorities' top priority -- and concern -- in recent days.
A Japanese nuclear and industrial safety official estimated that, between roughly 9 p.m. Sunday to 4 a.m. Monday, 1,170 tons of water were sprayed on the reactor and its overheating nuclear spent fuel pool to guard against overheating. Authorities fear that the evaporation of water might further expose fuel rods and release more radioactive vapors.
Experts track fallout from Fukushima Why spent fuel rods should matter to you Lawmaker: Japan's government doesn't lie
Explainer: Producing nuclear energy
Earlier, officials said that they were monitoring that reactor to determine whether to release gas in order to reduce mounting pressure in the containment vessel. The pressure buildup, specifically from excess hydrogen gas, had caused explosions at that reactor and at the Nos. 1 and 2 reactors. Late last week, three holes apiece were drilled into the Nos. 5 and 6 reactors in order to alleviate pressure.
This development came shortly after a Tokyo Electric official told CNN that electrical cables had been laid to connect the No. 3 reactor and the neighboring No. 4 reactor with an outside power source.
That meant that power could now be funneled to all six of the plant's reactors for its cooling systems. But electricity was still not moving to Nos. 1, 2, 3 and 4, because the March 11 mammoth earthquake and subsequent tsunami -- including seawater that had rushed into the reactors -- had damaged numerous pumps and other apparatus. The Tokyo Electric official said that spare parts were being brought in, so that everything could work again.
The disaster has killed more than 8,600 people and left more than 13,000 missing, many of them killed soon after a wall of water rushed in with the tsunami. Ever since, authorities have been work to avert further crisis -- and prevent more deaths -- at the Fukushima Daiichi plant, some 240 kilometers (150 miles) north of Tokyo.
Those efforts include a move to possibly encase one or more of the reactors in concrete, a last-ditch effort similar to what was done after the 1986 meltdown at the Chernobyl nuclear plant in the former Soviet Union -- considered the worst nuclear disaster at a plant.
On Monday, an official with Japan's nuclear and industrial safety agency told reporters that tests are expected to be conducted in the afternoon on how to use what he called a "concrete pump engine."
The engine would pump a mix of mortar and water into the reactor's spent nuclear fuel pool and containment vessel, the official said. The pool contains nuclear fuel rods that could give off radioactive material, if exposed and overheated, while the containment vessel is a steel and concrete shell that insulates radioactive material inside.
CNN reporter reflects on tsunami damage Pouring tons of water on power plant TEPCO official reports on power plant
While he did not indicate when or even if the concrete pump would be used, the official did say the target would be the plant's No. 4 reactor. In just over two hours on Monday morning alone, 13 fire engines sprayed about 90 tons toward that reactor in an attempt to cool it down.
A Tokyo electric official told CNN that six workers trying to restore electricity to that reactor have been exposed to more than 100 millisieverts of radiation. For reference, an individual in a developed country naturally is exposed to 3 millisieverts of radiation a year -- though Japan's health industry has set a 250 millisievert limit for those trying to combat the crisis at the Fukushima plant.
These efforts came as concerns remained high about the impact that already emitted radiation has had on food, water and people within range of the Fukushima facility.
Very small amounts -- far below the level of concern -- of radioactive iodine have been detected in tap water in Tokyo and most prefectures near the plant.
The health ministry said levels of radioactive iodine three times greater than the regulated standard were found in drinking water in a village near the plant and asked residents not to drink from the tap, Kyodo News reported Sunday.
The Japanese government has banned the sale of raw milk from Fukushima Prefecture, where the plant is located, and prohibited the sale of spinach from neighboring Ibaraki Prefecture after finding levels of radioactive iodine and cesium higher than government standards, the country's health ministry reported. And officials in Fukushima halted the distribution of locally grown vegetables outside the prefecture.
Edano said the contaminated milk detected in Fukushima Prefecture had not been distributed or sold.
On Saturday, officials said tainted milk was found 30 kilometers (18 miles) from the plant, and spinach was collected as far as 100 kilometers (65 miles) to the south, almost halfway to Tokyo.
The latest results accumulated and posted online by Japan's education, science and technology ministry showed slight but notable upticks in airborne radiation readings around Japan in recent days. But even the highest readings, .11 millisieverts some 30 kilometers northwest of the plant, were still considered significantly below what's considered dangerous to humans.
Nature has helped to minimize such airborne exposure since the quake, as winds from the northwest have blown many emissions from the plant out to sea.
But the wind direction is expected to change through Wednesday, potentially pushing more of the material to the southwest and over land.
"People are watching," said Akira Shioi, who lives in Kawasaki. "And people have greater concern than ever about the nuclear power plant incident."
Sursa
anda1
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Personalul centralei nucleare Fukushima a fost evacuat după ce nori de fum au început să iasă de la reactorul numărul 3. Reprezentanţii Tokyo Electric Power au precizat că reactorul numărul trei este cel mai avariat şi este încărcat cu un amestec de substanţe nocive. Pericolul de explozie a reapărut imediat după ce oficielii japonez anunţau primele veşti bune de la Fukushima şi anume că toate reactoarele au fost conectate la cabluri de electricitate.
http://www.antena3.ro/externe/peric...kushima-personalul-a-fost-evacuat-121024.html
http://www.antena3.ro/externe/peric...kushima-personalul-a-fost-evacuat-121024.html
Alin Todor
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ady24
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Radioactivitate anormală în apa mării din apropiere de Fukushima
Niveluri anormal de ridicate ale unor substanţe radioactive au fost detectate în apa de mare în apropiere de centrala nucleară japoneză de la Fukushima, a anunţat marţi compania exploatatoare Tepco, citată de AGERPRES.
Ratele de iod 131 şi de cesiu 134 erau de 126,7 ori şi respectiv 24,8 ori mai ridicate decât normele fixate de autorităţile nipone, a precizat Tokyo Electric Power /Tepco/.
De asemenea, nivelul de cesiu 137 era de 16,5 ori mai ridicat decât media normală, iar cel al cobaltului 58 era inferior normei, a declarat un responsabil al Tepco, Naoki.
Realitatea.net
Niveluri anormal de ridicate ale unor substanţe radioactive au fost detectate în apa de mare în apropiere de centrala nucleară japoneză de la Fukushima, a anunţat marţi compania exploatatoare Tepco, citată de AGERPRES.
Ratele de iod 131 şi de cesiu 134 erau de 126,7 ori şi respectiv 24,8 ori mai ridicate decât normele fixate de autorităţile nipone, a precizat Tokyo Electric Power /Tepco/.
De asemenea, nivelul de cesiu 137 era de 16,5 ori mai ridicat decât media normală, iar cel al cobaltului 58 era inferior normei, a declarat un responsabil al Tepco, Naoki.
Realitatea.net
Alin Todor
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[font="Georgia, Arial, Helvetica, sans-serif"]
JAPONIA: Nivelul radiaţiilor, tot mai crescut la centrala Fukushima
Nivelul radiaţiilor pe o rază de 20 km în jurul centralei nucleare Fukushima este de 1.600 de ori mai mare decât limita normală, potrivit unor oficiali ai Agenţiei Internaţionale pentru Energie Atomică (AIEA), citaţi de Kyodo, potrivit Agerpres.
[/font]
[font="Georgia, Arial, Helvetica, sans-serif"]Testele efectuate de specialiştii AIEA în diferite locaţii în jurul centralei au arătat niveluri de radiaţie între 2 şi 160 de microsieverţi pe oră, în timp ce nivelul normal în zonă n-ar trebui să depăşească 0,1 microsieverţi pe oră.
Cel mai mare nivel de radiaţii, de 161 de microsieverţi pe oră, a fost detectat în oraşul Namie, din prefectura Fukushima.
Guvernul nipon a dispus evacuarea populaţiei pe o rază de 20 de kilometri în jurul centralei şi a făcut apel la locuitorii aflaţi dincolo de această zonă, de la 20 la 30 de kilometri, să stea în case.
Fukushima, luptă contracronometru
Între timp, cele şase reactoare ale centralei nucleare Fukushima dispun de acum de o linie electrică externă, după instalarea unui cablu până la distribuitorul unităţilor 3 şi 4, a anunţat azi Agenţia pentru siguranţă nucleară.
Unităţile 3 şi 4 au fost conectate azi-dimineaţă, în timp ce 1-2 şi 5-6 au fost conectate în zilele precedente. Echipamentele lor nu sunt totuşi mereu alimentate, în afară de unităţile 5 şi 6.
Zeci de electricieni, pompieri şi ingineri sunt într-o cursă contracronometru la Fukushima pentru a evita noi accidente din cauza supraîncălzirii combustibilului radioactiv.
O parte din echipamentele centralei au fost distruse de seism şi tsunami, catastrofe care au lovit nord-estul Japoniei pe 11 martie. Bilanţul provizoriu al victimelor a ajuns la peste 20.000 de morţi şi dispăruţi.
Sursa
[/font]
JAPONIA: Nivelul radiaţiilor, tot mai crescut la centrala Fukushima
Nivelul radiaţiilor pe o rază de 20 km în jurul centralei nucleare Fukushima este de 1.600 de ori mai mare decât limita normală, potrivit unor oficiali ai Agenţiei Internaţionale pentru Energie Atomică (AIEA), citaţi de Kyodo, potrivit Agerpres.
[font="Georgia, Arial, Helvetica, sans-serif"]Testele efectuate de specialiştii AIEA în diferite locaţii în jurul centralei au arătat niveluri de radiaţie între 2 şi 160 de microsieverţi pe oră, în timp ce nivelul normal în zonă n-ar trebui să depăşească 0,1 microsieverţi pe oră.
Cel mai mare nivel de radiaţii, de 161 de microsieverţi pe oră, a fost detectat în oraşul Namie, din prefectura Fukushima.
Guvernul nipon a dispus evacuarea populaţiei pe o rază de 20 de kilometri în jurul centralei şi a făcut apel la locuitorii aflaţi dincolo de această zonă, de la 20 la 30 de kilometri, să stea în case.
Fukushima, luptă contracronometru
Între timp, cele şase reactoare ale centralei nucleare Fukushima dispun de acum de o linie electrică externă, după instalarea unui cablu până la distribuitorul unităţilor 3 şi 4, a anunţat azi Agenţia pentru siguranţă nucleară.
Unităţile 3 şi 4 au fost conectate azi-dimineaţă, în timp ce 1-2 şi 5-6 au fost conectate în zilele precedente. Echipamentele lor nu sunt totuşi mereu alimentate, în afară de unităţile 5 şi 6.
Zeci de electricieni, pompieri şi ingineri sunt într-o cursă contracronometru la Fukushima pentru a evita noi accidente din cauza supraîncălzirii combustibilului radioactiv.
O parte din echipamentele centralei au fost distruse de seism şi tsunami, catastrofe care au lovit nord-estul Japoniei pe 11 martie. Bilanţul provizoriu al victimelor a ajuns la peste 20.000 de morţi şi dispăruţi.
Sursa
[/font]
Alin Todor
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- FLASH: Black smoke from Fukushima's no.3 reactor gradually settling down - Kyodo7 minutes ago via web
- FLASH: Japan chief cabinet secretary: No need to widen evacuation zone now around Fukushima nuclear plant7 minutes ago via web
- FLASH: Japan agency says radiation level at Fukushima plant had been 435 microsieverts 2 hours before smoke seen7 minutes ago via web
- FLASH: Japan agency: Radiation level at Fukushima was 283.7 microsieverts shortly after smoke first seen7 minutes ago via web
- FLASH: Japan nuclear agency: Cause of smoke at Fukushima no.3 unit is still unknown31 minutes ago via web
- FLASH: Japan nuclear agency: Smoke at Fukushima no.3 unit is from building that houses reactor31 minutes ago via web
- FLASH: No flames seen from no.3 unit at Fukushima plant - NHKabout 1 hour ago via web
- FLASH: Black smoke seen rising from no.3 nuclear reactor at Fukushima plant - NHKabout 1 hour ago via web
Sursa
ady24
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Norul radioactiv ajunge în România. Vezi care sunt riscurile
Particule radioactive, emise de reactoarele avariate ale centralei nucleare japoneze Fukushima, au fost depistate în Islanda şi în Franţa şi, în urmatoarele zile, vor ajunge şi deasupra României, potrivit experţilor.
Ţara noastra este în afara unui pericol radioactiv, iar riscul la care se expun românii este nesemnificativ, garantează Lucian Biro, expert în securitate nucleară.
"Acest nor încărcat cu particule radioactive a ajuns deasupra Franţei, a ajuns deasupra Islandei, se îndreapta spre noi, dar nu există absolut niciun pericol radioactiv pentru populaţie", a subliniat Lucian Biro pentru Ziare.com.
De aceeaşi părere este şi Ionel Purinca, expert în energie nucleară, care spune că, deşi este posibil ca frontul de aer radioactiv, format în urma emanaţiilor de la Fukushima, să fi ajuns deja deasupra ţării noastre, riscurile sunt neglijabile.
El a precizat ca perioada de radioactivitate a iodului 131 este de doar 8 zile. Potrivit specialistului român, nivelul de radiaţii din Japonia a fost mai ridicat în momentul exploziilor de la Fukushima, însă, între timp, concentraţia s-a diminuat, astfel că acum nu reprezintă o ameninţare la adresa cetăţenilor.
Sursa realitatea.net
Particule radioactive, emise de reactoarele avariate ale centralei nucleare japoneze Fukushima, au fost depistate în Islanda şi în Franţa şi, în urmatoarele zile, vor ajunge şi deasupra României, potrivit experţilor.
Ţara noastra este în afara unui pericol radioactiv, iar riscul la care se expun românii este nesemnificativ, garantează Lucian Biro, expert în securitate nucleară.
"Acest nor încărcat cu particule radioactive a ajuns deasupra Franţei, a ajuns deasupra Islandei, se îndreapta spre noi, dar nu există absolut niciun pericol radioactiv pentru populaţie", a subliniat Lucian Biro pentru Ziare.com.
De aceeaşi părere este şi Ionel Purinca, expert în energie nucleară, care spune că, deşi este posibil ca frontul de aer radioactiv, format în urma emanaţiilor de la Fukushima, să fi ajuns deja deasupra ţării noastre, riscurile sunt neglijabile.
El a precizat ca perioada de radioactivitate a iodului 131 este de doar 8 zile. Potrivit specialistului român, nivelul de radiaţii din Japonia a fost mai ridicat în momentul exploziilor de la Fukushima, însă, între timp, concentraţia s-a diminuat, astfel că acum nu reprezintă o ameninţare la adresa cetăţenilor.
Sursa realitatea.net
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Imagini de la Fukushima
[attachment=20392:fukushima_00.jpg]
[attachment=20393:fukushima_10.jpg]
[attachment=20394:fukushima_11.jpg]
[attachment=20395:fukushima_12.jpg]
[attachment=20396:fukushima_13.jpg]
[attachment=20397:fukushima_14.jpg]
[attachment=20398:fukushima_17.jpg]
[attachment=20399:fukushima_18.jpg]
[attachment=20400:fukushima_19.jpg]
[attachment=20401:fukushima_20.jpg]
Sursa
[attachment=20392:fukushima_00.jpg]
[attachment=20393:fukushima_10.jpg]
[attachment=20394:fukushima_11.jpg]
[attachment=20395:fukushima_12.jpg]
[attachment=20396:fukushima_13.jpg]
[attachment=20397:fukushima_14.jpg]
[attachment=20398:fukushima_17.jpg]
[attachment=20399:fukushima_18.jpg]
[attachment=20400:fukushima_19.jpg]
[attachment=20401:fukushima_20.jpg]
Sursa
Alin Todor
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[font="Georgia, Times, sans-serif"][/font]
[font="'Lucida Grande"]The IAEA today released updated summary slides on reactor conditions at Fukushima Daiichi nuclear power plant.[/font]
Fukushima Daiichi Nuclear Accident Update (24 March 14:00 UTC)
[font="'Lucida Grande"]Spent Fuel Pools at Fukushima Daiichi Nuclear Power Plant - Updated[/font]
Spent fuel removed from a nuclear reactor is highly radioactive and generates heat. This irradiated fuel needs to be stored for one to three years in pools that cool the fuel, shield the radioactivity, and keep the fuel in the proper position to avoid fission reactions. If the cooling is lost, the water can boil and fuel rods can be exposed to the air, possibly leading to severe damage and a large release of radioactive materials.
Nuclear power plants must replace fuel every one to two years, and the Fukushima Daiichi reactors typically remove about 25 percent of the reactor's fuel -- to be replaced with fresh, or unirradiated, fuel -- during each refuelling outage. The spent fuel, which is hottest immediately after it is removed from the reactor, is placed in the spent fuel pool until it is cool enough to be moved to longer-term storage.
The concern about the spent fuel pools at Fukushima Daiichi is that the capability to cool the pools has been compromised. See diagram below for location of the pool in each reactor building.
[font="'Lucida Grande"]
[/font]
[font="'Lucida Grande"]
[/font]
[font="'Lucida Grande"]Number of Fuel Assemblies in Cooling Pools at Fukushima Daiichi[/font]
[font="'Lucida Grande"](Reported 17 March by Japan's Ministry of Economy, Trade and Industry)[/font]
Capacity Irradiated fuel assemblies Unirradiated fuel assemblies Most recent additions of irradiated fuel
[font="'Lucida Grande"]Unit 1 900 292 100 March 2010[/font]
[font="'Lucida Grande"]Unit 2 1,240 587 28 Sept 2010[/font]
[font="'Lucida Grande"]Unit 3 1,220 514 52 June 2010[/font]
[font="'Lucida Grande"]Unit 4 1,590 1,331 204 Nov 2010[/font]
[font="'Lucida Grande"]Unit 5 1,590 946 48 Jan 2011[/font]
[font="'Lucida Grande"]Unit 6 1,770 876 64 Aug 2010[/font]
Here is a summary of spent fuel conditions at Fukushima Daiichi nuclear power plant, based on documents and confirmed by Japanese officials :
Unit 1
Unit 1 experienced an explosion on 12 March that destroyed the outer shell of the building's upper floors. No precise information has been available on the status of the spent fuel pool.
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[font="'Lucida Grande"]Unit 2[/font]
Precise information on the status of the spent fuel pool was unavailable in the days following the earthquake, but Japan's Nuclear and Industrial Safety Agency began to release temperature data on 20 March:
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[font="'Lucida Grande"]20 March, 23:00 UTC: 49 °C[/font]
[font="'Lucida Grande"]21 March, 05:25 UTC: 50 °C[/font]
[font="'Lucida Grande"]21 March, 21:20 UTC: 51 °C[/font]
[font="'Lucida Grande"]22 March, 02:20 UTC: 53 °C[/font]
[font="'Lucida Grande"]22 March, 06:30 UTC: 50 °C[/font]
[font="'Lucida Grande"]22 March, 19:20 UTC: 51 °C[/font]
[font="'Lucida Grande"]23 March, 00:00 UTC: 51 °C[/font]
[font="'Lucida Grande"]23 March, 06:00 UTC: 51 °C[/font]
[font="'Lucida Grande"]23 March, 16:00 UTC: 52 °C[/font]
[font="'Lucida Grande"]24 March, 00:00 UTC: 47 °C[/font]
[font="'Lucida Grande"]Workers conducted an operation to spray 40 tonnes of seawater to the spent fuel pool on 20 March, and they added another 18 tonnes on 22 March.[/font]
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[font="'Lucida Grande"]Unit 3[/font]
Unit 3 experienced an explosion on 14 March that destroyed the outer shell of the building's upper floors. The blast may have damaged the primary containment vessel and the spent fuel pool. To address these concerns, authorities began spraying water into the building, first by helicopter on 17 March and then by fire trucks and other vehicles through 22 March. Starting 23 March, seawater was injected into the spent fuel using the cooling and purification line. By midday 24 March, 4-5 tonnes of seawater had been injected through this line.
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[font="'Lucida Grande"]Unit 4[/font]
This reactor was shut down 30 November 2010 for routine maintenance, and all the fuel assemblies were transferred from the reactor to the spent fuel pool, before the 11 March earthquake. The heat load in this pool is therefore larger than the others.
On 14 March, the building's upper floors were severely damaged, possibly causing a reduction of cooling capability in the spent fuel pool. Emergency workers began spraying water into the building on 20 March, and have continued daily since then. On 22 March, workers began using a concrete pump truck that can deliver water more effectively, placing 150 tonnes of water on 22 March and 130 tonnes on 23 March.
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[font="'Lucida Grande"]Units 5 and 6[/font]
Instrumentation at these reactors began to indicate rising temperatures at their spent fuel pools starting on 14 March. Three days later, Japanese technicians successfully started an emergency diesel generator at Unit 6, which they used to provide power to basic cooling and fresh-water replenishment systems. Workers created holes in the rooftops of both buildings to prevent any hydrogen accumulation, which is suspected of causing earlier explosions at Units 1 and 3.
A second diesel generator came online on 18 March, and the next day, the higher-capability Residual Heat Removal (RHR) system recovered full function. External power was restored to Units 5 and 6 on 22 March. Temperatures in the spent fuel pools of Units 5 and 6 have gradually returned to significantly lower temperatures, although the Unit 5 pool temperature increased somewhat on 23 March after pumps for the RHR system were stopped when the diesel generators were removed from service.
Common Use Spent Fuel Pool
In addition to pools in each of the plant's reactor buildings, there is another facility -- the Common Use Spent Fuel Pool -- where spent fuel is stored after cooling at least 18 months in the reactor buildings. This fuel is much cooler than the assemblies stored in the reactor buildings. Japanese authorities confirmed as of 18 March that fuel assemblies there were fully covered by water, and the temperature was 57 °C as of 20 March, 00:00 UTC. Workers sprayed water over the pool on 21 March for nearly five hours, and the temperature on 23 March was reported to be 57 °C.
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[font="'Lucida Grande"]Sursa[/font]
[font="'Lucida Grande"]The IAEA today released updated summary slides on reactor conditions at Fukushima Daiichi nuclear power plant.[/font]
Fukushima Daiichi Nuclear Accident Update (24 March 14:00 UTC)
[font="'Lucida Grande"]Spent Fuel Pools at Fukushima Daiichi Nuclear Power Plant - Updated[/font]
Spent fuel removed from a nuclear reactor is highly radioactive and generates heat. This irradiated fuel needs to be stored for one to three years in pools that cool the fuel, shield the radioactivity, and keep the fuel in the proper position to avoid fission reactions. If the cooling is lost, the water can boil and fuel rods can be exposed to the air, possibly leading to severe damage and a large release of radioactive materials.
Nuclear power plants must replace fuel every one to two years, and the Fukushima Daiichi reactors typically remove about 25 percent of the reactor's fuel -- to be replaced with fresh, or unirradiated, fuel -- during each refuelling outage. The spent fuel, which is hottest immediately after it is removed from the reactor, is placed in the spent fuel pool until it is cool enough to be moved to longer-term storage.
The concern about the spent fuel pools at Fukushima Daiichi is that the capability to cool the pools has been compromised. See diagram below for location of the pool in each reactor building.
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[font="'Lucida Grande"]Number of Fuel Assemblies in Cooling Pools at Fukushima Daiichi[/font]
[font="'Lucida Grande"](Reported 17 March by Japan's Ministry of Economy, Trade and Industry)[/font]
Capacity Irradiated fuel assemblies Unirradiated fuel assemblies Most recent additions of irradiated fuel
[font="'Lucida Grande"]Unit 1 900 292 100 March 2010[/font]
[font="'Lucida Grande"]Unit 2 1,240 587 28 Sept 2010[/font]
[font="'Lucida Grande"]Unit 3 1,220 514 52 June 2010[/font]
[font="'Lucida Grande"]Unit 4 1,590 1,331 204 Nov 2010[/font]
[font="'Lucida Grande"]Unit 5 1,590 946 48 Jan 2011[/font]
[font="'Lucida Grande"]Unit 6 1,770 876 64 Aug 2010[/font]
Here is a summary of spent fuel conditions at Fukushima Daiichi nuclear power plant, based on documents and confirmed by Japanese officials :
Unit 1
Unit 1 experienced an explosion on 12 March that destroyed the outer shell of the building's upper floors. No precise information has been available on the status of the spent fuel pool.
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[/font]
[font="'Lucida Grande"]Unit 2[/font]
Precise information on the status of the spent fuel pool was unavailable in the days following the earthquake, but Japan's Nuclear and Industrial Safety Agency began to release temperature data on 20 March:
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[/font]
[font="'Lucida Grande"]20 March, 23:00 UTC: 49 °C[/font]
[font="'Lucida Grande"]21 March, 05:25 UTC: 50 °C[/font]
[font="'Lucida Grande"]21 March, 21:20 UTC: 51 °C[/font]
[font="'Lucida Grande"]22 March, 02:20 UTC: 53 °C[/font]
[font="'Lucida Grande"]22 March, 06:30 UTC: 50 °C[/font]
[font="'Lucida Grande"]22 March, 19:20 UTC: 51 °C[/font]
[font="'Lucida Grande"]23 March, 00:00 UTC: 51 °C[/font]
[font="'Lucida Grande"]23 March, 06:00 UTC: 51 °C[/font]
[font="'Lucida Grande"]23 March, 16:00 UTC: 52 °C[/font]
[font="'Lucida Grande"]24 March, 00:00 UTC: 47 °C[/font]
[font="'Lucida Grande"]Workers conducted an operation to spray 40 tonnes of seawater to the spent fuel pool on 20 March, and they added another 18 tonnes on 22 March.[/font]
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[/font]
[font="'Lucida Grande"]Unit 3[/font]
Unit 3 experienced an explosion on 14 March that destroyed the outer shell of the building's upper floors. The blast may have damaged the primary containment vessel and the spent fuel pool. To address these concerns, authorities began spraying water into the building, first by helicopter on 17 March and then by fire trucks and other vehicles through 22 March. Starting 23 March, seawater was injected into the spent fuel using the cooling and purification line. By midday 24 March, 4-5 tonnes of seawater had been injected through this line.
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[/font]
[font="'Lucida Grande"]Unit 4[/font]
This reactor was shut down 30 November 2010 for routine maintenance, and all the fuel assemblies were transferred from the reactor to the spent fuel pool, before the 11 March earthquake. The heat load in this pool is therefore larger than the others.
On 14 March, the building's upper floors were severely damaged, possibly causing a reduction of cooling capability in the spent fuel pool. Emergency workers began spraying water into the building on 20 March, and have continued daily since then. On 22 March, workers began using a concrete pump truck that can deliver water more effectively, placing 150 tonnes of water on 22 March and 130 tonnes on 23 March.
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[/font]
[font="'Lucida Grande"]Units 5 and 6[/font]
Instrumentation at these reactors began to indicate rising temperatures at their spent fuel pools starting on 14 March. Three days later, Japanese technicians successfully started an emergency diesel generator at Unit 6, which they used to provide power to basic cooling and fresh-water replenishment systems. Workers created holes in the rooftops of both buildings to prevent any hydrogen accumulation, which is suspected of causing earlier explosions at Units 1 and 3.
A second diesel generator came online on 18 March, and the next day, the higher-capability Residual Heat Removal (RHR) system recovered full function. External power was restored to Units 5 and 6 on 22 March. Temperatures in the spent fuel pools of Units 5 and 6 have gradually returned to significantly lower temperatures, although the Unit 5 pool temperature increased somewhat on 23 March after pumps for the RHR system were stopped when the diesel generators were removed from service.
Common Use Spent Fuel Pool
In addition to pools in each of the plant's reactor buildings, there is another facility -- the Common Use Spent Fuel Pool -- where spent fuel is stored after cooling at least 18 months in the reactor buildings. This fuel is much cooler than the assemblies stored in the reactor buildings. Japanese authorities confirmed as of 18 March that fuel assemblies there were fully covered by water, and the temperature was 57 °C as of 20 March, 00:00 UTC. Workers sprayed water over the pool on 21 March for nearly five hours, and the temperature on 23 March was reported to be 57 °C.
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[font="'Lucida Grande"]Sursa[/font]
Alin Todor
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Miezul reactorului 3 de la Fukushima, deteriorat. Nivelul de radiaţii a depăşit preconizările
Agenţia Nucleară Japoneză a anunţat că miezul reactorului 3 ar putea fi deteriorat. Poluarea cu substanţe radioactive este mai mare decât se credea. În interiorul reactorului 3 de la Fukushima sunt 170 de tone de substanţe radioactive. Echipele de intervenţie au oprit operaţiunile de la Fukushima ca să măsoare nivelul de radiaţii.
"Este posibil ca incinta care conţine barele de combustibil în reactor sã fie avariatã", a declarat pentru AFP un oficial din cadrul companiei.
"S-au scurs substanţe radioactive departe de reactor", a explicat şi Hideyuki Nishiyama, purtãtorul de cuvânt al Agenþiei japoneze pentru siguranţa nuclearã. "Potrivit rezultatelor analizelor, credem cã proprietatea de etanºeizare a atins un anumit nivel, dar existã un risc mare ca reactorul sã fi fost avariat", a adãugat el.
Reactorul 3 a a fost grav avariat, dupã cutremurul din 11 martie. Acoperişul clãdirii superioare a fost distrus în întregime de o explozie puternicã.
10.000 de morţi, 17.500 de dispăruţi, 2.800 de răniţi
La două saptămâni de la tsunami, Japonia continuă să numere victimele. Potrivit unui anunţ făcut vineri de poliţia naţională niponă, citat de AFP, bilanţul cutremurului şi valului uriaş a depăşit pragul de 10.000 de decese confirmate, 17.500 de dispăruţi şi aproape 2.800 de răniţi.
Conform ultimelor date statistice publicate vineri la ora 11.00 (04.00, ora României), poliţia a declarat că 10.035 de morţi au fost confirmaţi şi că 17.443 de persoane erau date dispărute.
Numărul răniţilor a ajuns la 2.775, a adăugat poliţia, însărcinată să compileze statisticile provenind de la diferite prefecturi afectate şi să identifice cadavrele.
În plus, doi angajaţi ai centralei de la Fukushima au fost internaţi de urgenţă, după ce au călcat într-o baltă radioactivă. În ciuda incidentului, ceilalţi muncitori au reuşit să restabilească alimentarea cu energie electrică în sala de control a reactorului 1.
Aceştia au şi fotografiat interiorul. Din imagini se poate vedea ce a rămas cu adevărat din centrală. Între timp, locuitorii din Tokyo trăiesc cu frica de a nu fi şi ei contaminaţi din cauza apei de la robinet şi a alimentelor. Guvernul nipon a decis ca părinţii copiilor mici să primească apă îmbuteliată.
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Alin Todor
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Vesti rele de la Fukushima. Nivel foarte mare de iod radioactiv in ocean
Cand credeau ca situatia incepe sa se normalizeze, japonezii au mai primit o veste proasta. Echipele de interventie de la Fukushima au detectat in apa oceanului iod radioactiv in cantitate de 1.250 de ori mai mare decat nivelul normal.
Specialistii spera ca aceasta concentratie ridicata sa dispara, odata cu mareea.
Ingrijoratoare este si situatia angajatilor centralei care au fost iradiati accidental vineri. In plus, autoritatile inca nu stiu daca nu exista scurgeri masive din cuvele unde sunt depozitate barele de uraniu.
Pe de alta parte, echipele de interventie vor folosi de acum incolo apa dulce, pentru racirea reactoarelor. Cea sarata din Pacific nu pare sa dea rezultatele scontate.
Agentia japoneza pentru Siguranta Nucleara, citata de AFP, a precizat ca testele au fost realizate de compania de electricitate care administreaza centrala, Tokyo Electric Power (TEPCO), pornind de la apa prelevata in largul reactorului 1.
"Daca beti 50 de centilitri de apa curenta cu aceasta concentratie de iod, atingeti dintr-o data limita anuala pe care o puteti absorbi. Acesta este un nivel relativ ridicat", a explicat un purtator de cuvant al agentiei.
"In plus, concentratia de iod se reduce cu jumatate la opt zile, astfel ca atunci cand oamenii vor manca produse din mare, cantitatea sa va fi probabil diminuata puternic", a precizat acesta.
Aceasta centrala, situata la 250 de kilometri nord-est de Tokyo, a fost grav avariata de seismul urmat de un tsunami la 11 martie. Sistemele de racire de la patru reactoare sunt de atunci oprite, generand numeroase incidente si emisii de particule radioactive.
Sursa
Cand credeau ca situatia incepe sa se normalizeze, japonezii au mai primit o veste proasta. Echipele de interventie de la Fukushima au detectat in apa oceanului iod radioactiv in cantitate de 1.250 de ori mai mare decat nivelul normal.
Specialistii spera ca aceasta concentratie ridicata sa dispara, odata cu mareea.
Ingrijoratoare este si situatia angajatilor centralei care au fost iradiati accidental vineri. In plus, autoritatile inca nu stiu daca nu exista scurgeri masive din cuvele unde sunt depozitate barele de uraniu.
Pe de alta parte, echipele de interventie vor folosi de acum incolo apa dulce, pentru racirea reactoarelor. Cea sarata din Pacific nu pare sa dea rezultatele scontate.
Agentia japoneza pentru Siguranta Nucleara, citata de AFP, a precizat ca testele au fost realizate de compania de electricitate care administreaza centrala, Tokyo Electric Power (TEPCO), pornind de la apa prelevata in largul reactorului 1.
"Daca beti 50 de centilitri de apa curenta cu aceasta concentratie de iod, atingeti dintr-o data limita anuala pe care o puteti absorbi. Acesta este un nivel relativ ridicat", a explicat un purtator de cuvant al agentiei.
"In plus, concentratia de iod se reduce cu jumatate la opt zile, astfel ca atunci cand oamenii vor manca produse din mare, cantitatea sa va fi probabil diminuata puternic", a precizat acesta.
Aceasta centrala, situata la 250 de kilometri nord-est de Tokyo, a fost grav avariata de seismul urmat de un tsunami la 11 martie. Sistemele de racire de la patru reactoare sunt de atunci oprite, generand numeroase incidente si emisii de particule radioactive.
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anda1
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Radioactivitatea in apa de mare linga reactorul 2 este de 10 milioane ori peste nivelul normal, spun oficialii companiei care administreaza centrala. Lucratorii care incercau sa raceasca miezul reactorului pentru a evita un colaps, au fost evacuati. Agentia Nucleara a ONU a avertizat ca criza ar putea dura luni de zile.
CNN
va reamintesc ca aceasta radioactivitate este data de iodul 131 si cesiul 137, care sint produsi de fisiune. daca iodul are un timp de injumatatire de aprox 8 zile si va disparea curind dupa ce scurgerile vor fi oprite, cu cesiul este o problema fiindca timpul lui de injumatatire este de 30 de ani.
CNN
va reamintesc ca aceasta radioactivitate este data de iodul 131 si cesiul 137, care sint produsi de fisiune. daca iodul are un timp de injumatatire de aprox 8 zile si va disparea curind dupa ce scurgerile vor fi oprite, cu cesiul este o problema fiindca timpul lui de injumatatire este de 30 de ani.
Alin Todor
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TEPCO a calculat gresit nivelul radiatiilor la centrala de la Fukushima
Compania Tokyo Electric Power (TEPCO), care exploatează centrala nucleară Fukushima, a recunoscut că s-a înşelat când a anunţat, duminică dimineaţă, un nivel al radioactivităţii “de zece milioane de ori mai mare” decât cel normal, în apa scursă de la reactorul 2.
TEPCO a convocat de urgenţă o conferinţă de presă, după ce numărul de “zece milioane” a fost preluat de presa japoneză şi cea internaţională, alimentând psihoza referitoare la centrala avariată.
În schimb, anunţul privind nivelul măsurat de “1.000 de milisievert pe oră” în apa descoperită în subsolul sălii turbinei este exact, a dat asigurări compania.
Vicepreşedintele TEPCO, Sakae Muto, a explicat că elemente radioactive au fost confundate în cursul analizei asupra eşantioanelor prelevate din apă, relatează agenţia de presă Jiji.
“S-a produs o confuzie între iod 134 şi cobalt 56″, a declarat Muto, citat de Jiji. Noi analize vor fi realizate cât mai rapid, a adăugat el.
Noile precizări ale TEPCO au intervenit după ce Comisia privind Siguranţa Nucleară din Japonia, un organism guvernamental, a cerut companiei să revizuiască aceste calcule.
Sursa
Compania Tokyo Electric Power (TEPCO), care exploatează centrala nucleară Fukushima, a recunoscut că s-a înşelat când a anunţat, duminică dimineaţă, un nivel al radioactivităţii “de zece milioane de ori mai mare” decât cel normal, în apa scursă de la reactorul 2.
TEPCO a convocat de urgenţă o conferinţă de presă, după ce numărul de “zece milioane” a fost preluat de presa japoneză şi cea internaţională, alimentând psihoza referitoare la centrala avariată.
În schimb, anunţul privind nivelul măsurat de “1.000 de milisievert pe oră” în apa descoperită în subsolul sălii turbinei este exact, a dat asigurări compania.
Vicepreşedintele TEPCO, Sakae Muto, a explicat că elemente radioactive au fost confundate în cursul analizei asupra eşantioanelor prelevate din apă, relatează agenţia de presă Jiji.
“S-a produs o confuzie între iod 134 şi cobalt 56″, a declarat Muto, citat de Jiji. Noi analize vor fi realizate cât mai rapid, a adăugat el.
Noile precizări ale TEPCO au intervenit după ce Comisia privind Siguranţa Nucleară din Japonia, un organism guvernamental, a cerut companiei să revizuiască aceste calcule.
Sursa