Japan nuklir power plant sedang diambang meltdown!!!! (nah lohh)

[kullatiro]

wah tambah ngeri saja nihh, katanya tidak mungkin seperti chernobyl tetapi ada yang mengatakan japan nuclear disaster ini mungkin akan lebih hebat dari chernobyl.

   

[at] Maria D: Regarding the danger of spent fuel ponds, this gives an idea: blogs.forbes.com — "The pool cooling water must be continuously circulated. Without circulation, the still thermally hot irradiated nuclear fuel in the storage pools will begin to boil off the cooling water. Within a day or two, the pool's water could completely boil away. Without cooling water, the irradiated nuclear fuel could spontaneously combust in an exothermic reaction. Since the storage pools are not located within containment, a catastrophic radioactivity release to the environment could occur. Up to 100 percent of the volatile radioactive Cesium-137 content of the pools could go up in flames and smoke, to blow downwind over large distances. Given the large quantity of irradiated nuclear fuel in the pool, the radioactivity release could be worse than the Chernobyl nuclear reactor catastrophe of 25 years ago."

Here is the original Forbes article quoted on the Reuters live blog. The article written over two days ago quotes a nuclear expert who states that fuel rods catching on fire would be a worse case scenario and in fact worse than Chernobyl.

The Institute for Public Accuracy issued the following statement by nuclear expert, Kevin Kamp, about the risk of nuclear disaster in post-Earthquake Japan:  "The electrical grid is down. The emergency diesel generators have been damaged. The multi-reactor Fukushima atomic power plant is now relying on battery power, which will only last around eight hours. The danger is, the very thermally hot reactor cores at the plant must be continuously cooled for 24 to 48 hours. Without any electricity, the pumps won't be able to pump water through the hot reactor cores to cool them. Once electricity is lost, the irradiated nuclear fuel could begin to melt down. If the containment systems fail, a catastrophic radioactivity release to the environment could occur."

"In addition to the reactor cores, the storage pool for highly radioactive irradiated nuclear fuel is also at risk. The pool cooling water must be continuously circulated. Without circulation, the still thermally hot irradiated nuclear fuel in the storage pools will begin to boil off the cooling water. Within a day or two, the pool's water could completely boil away. Without cooling water, the irradiated nuclear fuel could spontaneously combust in an exothermic reaction. Since the storage pools are not located within containment, a catastrophic radioactivity release to the environment could occur. Up to 100 percent of the volatile radioactive Cesium-137 content of the pools could go up in flames and smoke, to blow downwind over large distances. Given the large quantity of irradiated nuclear fuel in the pool, the radioactivity release could be worse than the Chernobyl nuclear reactor catastrophe of 25 years ago."

Kamps is a specialist in nuclear waste at Beyond Nuclear and conducted research last year assessing the state of nuclear facilities in Japan.

http://blog.alexanderhiggins.com/2011/03/15/japan-confirms-disaster-worse-chernobyl-exposed-spent-fuel-rods-fire-8397/     

ehm, mesti di ngat yang diatas itu berita blog bukan berita resmi dari mayor newspaper

[kullatiro]

seberapa efektif Pil Iodine yang katanya anti radiasi nuklir??
mungkin ada yang tau?

yang ini mesti tanya saudara forte jadi lebih jelas , selain pil iodine ada nori ( rumput laut juga mengandung iodine, kebetulan wa ada membaca tentang nori ini di wikipedia )

http://en.wikipedia.org/wiki/Iodine

Nori is about 1/3 protein and 1/3 dietary fiber. It contains high proportions of iodine, carotene, vitamins A, B and C1, as well as significant amounts of calcium and iron. While the nutritional value varies, one example of 100 g of dry yaki-nori contains 41.4 g of protein, 3.7 g of fat, 36.0 g of dietary fiber, 280 mg of calcium, 300 mg of magnesium, 2.4 mg of potassium, 3.6 mg of zinc and 11.4 mg of iron. That same 100 g of dry yaki-nori also contains 25,000 μg of vitamin A (β-carotene), 4.6 mg of vitamin E, 390 μg of vitamin K, 0.69 mg of vitamin B1, 2.33 mg of vitamin B2, 11.7 mg of niacin, 0.59 mg of vitamin B6, 57.6 μg of vitamin B12, 1.90 μg of folic acid, 1.18 mg of pantothenic acid and 210 mg of vitamin C.[5]

http://en.wikipedia.org/wiki/Nori



http://www.edenfoods.com/store/product_details.php?products_id=108980

http://www.itmonline.org/arts/seaweed.htm

[kullatiro]

The French government said on Wednesday that Japan was losing control of the situation at the Fukushima nuclear power plant and urged its nationals in Tokyo to leave the country or head to southern Japan.

http://uk.reuters.com/article/2011/03/16/uk-japan-quake-france-idUKLNE72F04W20110316

TOKYO — Japan's nuclear crisis intensified on Wednesday after the authorities announced that a second reactor unit at the stricken Fukushima Daiichi plant in northeastern Japan may have ruptured and appeared to be releasing radioactive steam.

The break, at the No. 3 reactor unit, worsened the already perilous conditions at the plant, a day after officials said the containment vessel in the No. 2 reactor had also cracked.

http://www.nytimes.com/2011/03/17/world/asia/17nuclear.html?_r=1

Companies in North America have reported selling out of potassium iodide supplements, which can prevent the body absorbing radioactive iodine, while in the UK one chemical manufacturer has reported a "surge" in inquiries about the chemical.

http://www.guardian.co.uk/world/2011/mar/16/anti-radiation-tablet-sales-soar-us

[ryu]

'Suicide squad' struggles to cool reactors as radiation levels rise

By David McNeill in Tokyo

Friday, 18 March 2011

Japan yesterday deployed army helicopters and police water cannon manned by what the media are calling "suicide squads" in a frantic attempt to cool overheating fuel rods and prevent meltdown at a nuclear power plant ravaged by an earthquake and tsunami one week ago.

Operations were hampered by dangerously high radioactivity around the Fukushima Daiichi complex, which forced the authorities to evacuate the heavily protected workers periodically throughout the day. The plant's operator, Tokyo Electric Power (Tepco), admitted last night that the tactics had so far failed to cut radiation levels, which were about 3,600 microseiverts per hour, nearly four times the exposure considered safe in a year.

Tepco has been sending a rotating team of about 180 workers into the plant to prevent more contamination leaking from its six reactors, after a series of explosions tore away the buildings housing them. The cores of at least three reactors are believed to have partially melted since diesel-fuelled cooling systems were knocked out by last Friday's earthquake and tsunami.

Fuel pods in reactors 3 and 4 are thought to be dangerously short of water, meaning they are overheating and leaking radioactivity. A team from the US Nuclear Regulatory Commission warned yesterday that the cooling pond for the most troubled reactor 4 is completely dry, exposing fuel rods inside to air and increasing the risk of overheating. Tepco has not ruled out the possibility of a nuclear fission chain reaction.

Throughout the day television showed army Chinook helicopters dumping tons of sea water onto the Fukushima plant, about 150 miles from Tokyo, to try and refill the damaged pond in reactor 3. But state broadcaster NHK said the plan had to be abandoned because the pilots were exposed to gamma rays from the crippled complex. Riot police were also deployed yesterday with water canons to spray through holes in the number 3 reactor building. The Sankei newspaper dubbed the police team "Kesshitai", meaning a "unit that expects to die". The UN said engineers had connected a power line to reactor 2. This would allow the restart of pumps to cool the reactor.

The crisis at the plant's six reactors forced the government last night to warn that a Tokyo-wide blackout could occur following a surge in energy demand caused by the use of heaters in unseasonably cold weather, which is already adding to the misery of hundreds of thousands of people left homeless by the twin disasters.

Growing concern about the status of the plant has also led to a series of stark warnings by embassies in the country. France advised its citizens to leave Tokyo. Britain, Ireland and many other countries have recommended its nationals reconsider travelling to Tokyo.

The US State Department has chartered planes to fly families of military and government personnel well away from the complex. Temple University's Japan campus announced yesterday that it is evacuating 200 students from the capital because of radiation fears.

Officials and experts have said that the levels of radiation detected in Tokyo are so far not harmful to human health, but thousands of foreigners have put their families on trains to the west or south of the country, or on planes to Asia, Europe or America. Many have quietly taken holidays from work.

The exodus of foreigners contrasts with the stoic resignation of millions of Japanese around them. Despite the supposed threat of nuclear Armageddon, black-suited salarymen can be seen going to work every day as usual. Housewives calmly queue for bread, water and petrol around the city.

The ongoing crisis has also forced two Japanese companies to halt plans to build new nuclear complexes. Tokyo Electric Power Co., operator of the stricken Fukushima complex, announced yesterday it had suspended the construction of a 1,380-megawatt complex – the country's largest – in Aomori Prefecture. Another huge plant in the same prefecture was shelved yesterday, three years into construction.

The desperate fight to prevent nuclear catastrophe in Fukushima has overshadowed the plight of nearly half a million people sheltering in refugee centres in the north-east of the country. Snow and freezing weather has hampered the delivery of relief to the worst affected areas. Fukushima's governor, Yuhei Sato, said that frustration at the lack of hot food, medicine and petrol had reached "boiling point".

Drained storage ponds present greatest danger

A chemical reaction that generates enough heat to melt the zirconium rods containing highly radioactive nuclear fuel is the biggest problem facing the stricken Fukushima nuclear plant, a British nuclear expert said yesterday.

It is likely that the water in one or more of the swimming-pool sized storage ponds used to keep nuclear fuel safe when it is stored outside the reactors has leaked to dangerously low levels, exposing the zirconium cladding of the fuel rods to steam and air, said Professor Andrew Sherry. This causes rapid oxidation and the generation of heat which can raise temperatures to 800C – high enough to start a fire or cause an explosion. This would send radioactive material directly into the air as the containment buildings have lost their roofs, said Professor Sherry.

"I think the storage ponds is the most serious issue, and the reason for that is that we have the possibility of radioactive release straight up, because there is no roof on the buildings," said Professor Sherry, director of the Dalton Nuclear Institute at Manchester University. "As the water level drops down and the zirconium oxidises, it oxidises more rapidly as the temperature goes up and it is exposed to steam. That reaction generates heat."

"The explosion in Reactor 3 seems to have damaged the two fuel storage ponds at the top of Reactor 3 and Reactor 4. We think this has probably meant that water has started to drain away," he added.

The storage pond in the building housing Reactor 4 may have drained totally, setting off a reaction that would raise temperatures to a point where a fire is almost inevitable, said Professor Sherry.


ada pasukan bunuh dirinya nih

[kullatiro]

namanya Fukushima 50, awal nya hanya 50 orang staff yang di sebut sekelton staff ( staff kerangka tulang)

http://en.wikipedia.org/wiki/Fukushima_50

[johan3000]

rasanya PLTN tsb agak telat dimatikan ?

[kullatiro]

perkembangan terakhir ada kabar baik penyiraman air oleh mobil pemadam kebakaran berhasil menurunkan suhu di reaktor no 3.

Toshimi Kitazawa told a news conference in Tokyo on Saturday that water-spraying proved to be effective in cooling down the temperature of the spent fuel rod pool of the No.3 reactor.

He said SDF officials measured the temperatures while observing the damage from a helicopter.

Kitazawa said the government's disaster task force reports that a temperature of less than 100 degrees Celsius shows the reactors are more stable than had been expected.

http://www3.nhk.or.jp/daily/english/19_24.html
 
kabar buruk biasa belakangan yahh, susu dan bayam terkontaminasi radiasi  yang melewati standrat baku terdeteksi dalam makanan tersebut

Chief Cabinet Secretary Yukio Edano says the government was informed around 5:30 PM on Friday that higher levels of radiation than the legal standard were detected in fresh milk from cows at a dairy farm in Fukushima Prefecture.

He also said that at 11:00 AM on Saturday, the government received information that six samples of spinach tested at a research institute in Ibaraki Prefecture contained higher levels of radiation than the official standard.

Early on Saturday morning, the health ministry asked Ibaraki Prefecture to determine where the spinach samples came from and their distribution route.

The prefecture was also asked to take measures under the Food Sanitation Law if necessary, including a ban on sales.

http://www3.nhk.or.jp/daily/english/19_21.html

[kullatiro]

minta ampun dah nih bencana nuklir masih terus berlangsung kapan bisa di kendalikan nya yah soalnya selama tidak dapat di kendalikan masih terus terusan mengeluarkan bahan radioaktif dan debu debunya itu lohh berbahaya bila terbawa angin dan hujan, kalau bom atom di nagasaki dan hirosima sekali meledak selesai debunya terbawa angin kemana gitu, kalau bencana nuklir ini dah lebih dari seminggu nihh?

dah mulai dah tanda tanda terkontaminasi radioaktif dari makanan, air minum dll, bencana tahap ke 2 ada makanan dan minuman tapi sebenarnya tidak bisa dan boleh di makan dan minum.

5 radioactive materials detected

Tokyo Electric Power Company says some of the nuclear fuel at the Fukushima Daiichi nuclear power plant has apparently been damaged, as higher levels of radioactive materials have been detected in the vicinity.

The utility on Monday released the results of a radiation survey carried out at the plant on Saturday.

Officials detected in the air 5 radioactive materials that are generated by nuclear fission.

The level of iodine 131 was 5.9 milibecquerels per cubic centimeter. That's about 6 times the permissible level for workers without protective masks.

http://www3.nhk.or.jp/daily/english/21_22.html

   

[rooney]

PESAN-PESAN memilukan dikirim para pekerja yang mencoba untuk mencegah bencana nuklir skala penuh di pembangkit listrik tenaga nuklir (PLTN) yang bermasalah di Jepang. Pesan-pesan itu mengungkapkan, mereka tahu betul bahwa mereka sedang menjalankan misi bunuh diri.

Seorang dari mereka, yang disebut sebagai Fukushima Fifty, mengatakan, mereka menerima dengan tabah nasib mereka seperti suatu hukuman mati. Seorang yang lain, setelah menyerap dosis radiasi yang hampir mematikan, mengatakan kepada istrinya, "Tolong terus lakoni hidup dengan baik, untuk sementara saya tidak bisa pulang."

Tingkat radiasi di pintu masuk PLTN itu berada pada level yang akan langsung membunuh para pekerja atau menyebabkan mereka menderita penyakit mengerikan dalam sisa hidup mereka. Para ahli mengatakan, pakaian kedap udara yang mereka kenakan hanya sedikit bisa menghentikan paparan radiasi.

Harian Inggris, The Dailymail, akhir pekan lalu melaporkan, kelompok Fukushima Fifty (Limapuluh Orang Fukushima) itu tetap bertahan setelah 700 rekan mereka melarikan diri saat tingkat radiasi menjadi terlalu berbahaya. Identitas mereka belum terungkap, tetapi para ahli mengatakan, mereka sepertinya para teknisi garis depan dan petugas pemadam kebakaran yang sangat mengetahui pembangkit itu.

Diperkirakan, kebanyakan dari mereka adalah laki-laki paruh baya yang menjadi sukarelawan karena mereka sudah memiliki anak—pekerja muda mungkin akan menjadi tidak subur oleh dosis radiasi yang tinggi. Mereka disebut Fukushima Fifty, tetapi sesungguhnya kelompok itu berjumlah 200 orang yang bekerja empat shift secara bergiliran. Mereka bekerja untuk menghidupkan kembali sistem pendingin reaktor Fukushima yang rusak akibat hantaman tsunami.

Jumat lalu, pesan-pesan menyayat hati mereka kepada keluarganya dipublikasikan televisi nasional Jepang yang telah mewawancarai kerabat mereka. Seorang anggota keluarga mereka berkata, "Ayah saya masih bekerja di pembangkit itu. Dia mengatakan, dia menerima nasibnya, seperti sebuah hukuman mati." Seorang perempuan mengatakan, suaminya yang berada di pembangkit itu terus bekerja dan sepenuhnya menyadari ia sedang dibombardir radiasi.

Perempuan yang lain mengatakan, ayahnya yang berusia 59 tahun secara sukarela mengajukan diri untuk tugas di Fukushima. Ia menambahkan, sebagaimana dikutip Dailymail, "Saya mendengar bahwa ia secara sukarela meskipun ia akan pensiun dalam waktu setengah tahun dan mata saya jadi penuh dengan air mata. Di rumah, ia tidak tampak seperti seseorang yang bisa menangani pekerjaan besar. Tapi hari ini, saya benar-benar bangga padanya. Saya berdoa agar dia kembali dengan selamat."

Gadis lain yang ayahnya bekerja di reaktor Fukushima itu berkata, "Saya tidak pernah melihat ibu saya menangis begitu kencang." Dia menulis di Twitter, "Orang-orang di pembangkit itu berjuang, mengorbankan diri mereka untuk melindungi Anda. Semoga Ayah kembali dalam keadaan hidup."

Dari semua mereka yang bertahan di pembangkit itu, lima diantaranya diketahui meninggal dan dua hilang. Sedikitnya 21 orang lainnya terluka. Seorang pekerja perempuan yang mengaku bertugas di reaktor Fukushima Nomor 2 saat tsunami melanda telah mem-posting di akunnya di internet tentang apa yang terjadi.

Michiko Otsuki, yang sejak saat itu mencari perlindungan, menulis pada sebuah situs jejaring sosial Jepang yang diterjemahkan The Straits Times sebagai berikut: "Di tengah suara alarm tsunami pada pukul 03.00 pada malam hari ketika kami tidak bisa melihat ke mana kami pergi, kami terus bekerja untuk memulihkan reaktor-reaktor di tempat kami, yang berada tepat di tepi laut, dengan kesadaran bahwa ini bisa berarti kematian. Mesin yang mendinginkan reaktor itu betul-betul berada di tepi laut, dan hancur oleh tsunami. Setiap orang bekerja mati-matian untuk mencoba memulihkannya."

"Memerangi kelelahan dan perut kosong, kami menyeret diri kembali bekerja. Ada banyak yang belum dapat berhubungan dengan anggota keluarga mereka, tetapi menghadapi situasi ini dan bekerja keras."

Dr Michio Kaku, seorang ahli fisika teoritis, mengatakan kepada jaringan televisi AS, ABC, bahwa situasi telah memburuk dalam hari-hari terakhir. "Kami berbicara tentang para pekerja yang masuk ke reaktor itu mungkin sebagai misi bunuh diri," katanya.

Michael Friedlander, yang telah bekerja di manajemen krisis di pembangkit nuklir yang sama di Amerika, menambahkan, para pekerja mungkin makan ransum militer dan minum air dingin untuk bertahan hidup. "Di tengah rasa dingin, gelap, dan Anda melakukan hal itu sambil mencoba untuk memastikan Anda tidak mencemari diri Anda saat Anda sedang makan," katanya.

"Saya dapat memberitahu Anda dengan kepastian 100 persen bahwa mereka benar-benar berkomitmen untuk melakukan apa pun yang secara manusiawi perlu untuk membuat pembangkit itu berada dalam kondisi aman, bahkan dengan risiko hidup mereka sendiri."


Sumber : Kompas