company:tokyo electric power co

  • JAPON : Record outdoor radiation level that ‘can kill in 20 min’ detected at Fukushima
    http://www.brujitafr.fr/article-japon-record-outdoor-radiation-level-that-can-kill-in-20-min-detec

    http://rt.com/files/news/21/6d/00/00/fukushima.si.jpg

    Outdoor radiation levels have reached their highest at Japan’s Fukushima nuclear plant,warns the operator company.Radiation found in an area near a steel pipe that connects reactor buildings could kill an exposed person in 20 minutes,local media reported. The plant’s operator and the utility responsible for the clean-up Tokyo Electric Power Company (TEPCO) detected record radiation levels on a duct which connects reactor buildings and the 120 meter tall ventilation pipe located outside on Friday. TEPCO measured radiation at eight locations around the pipe with the highest estimated at two locations - 25 Sieverts per hour and about 15 Sieverts per hour, the company said. This is the highest level ever detected outside the reactor (...)

    #NUCLEAIRE


  • #Fukushima : défauts dans un dispositif bloquant les passage d’éléments radioactifs
    http://lemonde.fr/japon/article/2013/09/26/fukushima-des-defauts-dans-un-dispositif-bloquant-les-passage-d-elements-rad
    Rho mais non, c’est pas grave

    Tokyo Electric Power Company (Tepco), la compagnie exploitant la centrale accidentée de Fukushima a indiqué jeudi avoir découvert un trou dans un rideau sous-marin qui bloque le passage d’éléments radioactifs dans la mer.

    Ce problème a été constaté devant les réacteurs 5 et 6 (peu endommagés) par un technicien d’une entreprise œuvrant sur le site pour le compte de Tepco. Une sorte de rideau vertical a été installé par Tepco pour bloquer les éléments radioactifs dans le port de la centrale et les empêcher de filer dans l’océan Pacifique.

    L’entreprise n’a pas précisé quelles pouvaient être les conséquences de cette avarie, mais a indiqué que les mesures de radioactivité en mer n’avaient pas montré d’augmentation notable. « La radioactivité est très faible à proximité des réacteurs 5 et 6 et le risque de diffusion d’éléments radioactifs est peu probable », a expliqué la compagnie.

    #nucléaire #radioactivité


  • How everything went so wrong at #Fukushima - Salon.com
    http://www.salon.com/2013/08/23/how_everything_went_so_wrong_at_fukushima

    The plant’s operator, Tokyo Electric Power Company, or Tepco, had “rigged a makeshift system of pipes and hoses” to continue cooling the reactors. From the beginning, that contaminated water has been leaking. As much as possible was contained in the plant’s storage tanks, but some made its way into the sea. For the past two and a half years, a “massive underground reservoir” of contaminated water has been building up underneath the plant. Tepco is widely alleged to have not done enough to contain it.

    The slow, seeping buildup of a second catastrophe came to a head this summer. On July 10, Japan’s nuclear watchdog announced it “highly suspected” that the plant was leaking contaminated water into the ocean.

    #nucléaire


  • Et pendant ce temps à Fukushima... - Arrêt sur images
    http://www.arretsurimages.net/articles/2013-08-08/Et-pendant-ce-temps-a-Fukushima-id6047

    Situation hors de contrôle à Fukushima. Si l’opérateur japonais Tepco (Tokyo Electric Power Company) le niait depuis longtemps, il l’a désormais reconnu : de l’eau radioactive se déverse bel et bien dans l’océan (300 tonnes par jour, selon un chiffre communiqué aujourd’hui par le gouvernement). Cette déclaration remet momentanément Fukushima au centre des préoccupations médiatiques. Depuis deux ans, les médias internationaux et français ne suivent plus la situation que de loin. Selon des blogueurs de Fukushima, Tepco continue d’occulter des éléments sur la situation dans la centrale et ses conséquences.


  • #Fukushima et le casse-tête des eaux contaminées | Monde - lesoir.be
    http://www.lesoir.be/279649/article/actualite/monde/2013-07-11/fukushima-et-casse-tete-des-eaux-contaminees

    Une brusque montée des taux de césium radioactif a été mesurée dans la nappe phréatique. Elle pourrait venir des cœurs fondus des réacteurs

    J’avais loupé ce superbe usage du conditionnel ! #journaliste_c_est_un_metier #catastrophe_nucleaire #pollution

    Du coup je découvre cet euphémisme réjouissant :

    Fukushima : fuite d’eau radioactive
    http://www.gentside.com/japon/fukushima-fuite-d-039-eau-radioactive_art24266.html

    Quinze tonnes d’#eau_radioactive se sont échappées ce mardi de la centrale nucléaire japonaise Fukushima, fragilisée par le séisme et le tsunami de mars dernier.

    L’Agence japonaise de sûreté nucléaire et industrielle a annoncé ce mardi la fuite de quinze tonnes d’eau radioactive dans le sol. L’exploitant de la centrale TEPCO, pour Tokyo Electric Power Co, a demandé l’ouverture d’une enquête sur les causes de l’écoulement.

    On était trois mois après l’explosion. La centrale "fragilisée" :-p. Et l’exploitant demandait une enquête sur les causes de l’écoulement ! Bravo.

    Et puis aujourd’hui :

    « Urgence » nucléaire à Fukushima | Sciences et santé - lesoir.be
    http://www.lesoir.be/294994/article/actualite/sciences-et-sante/2013-08-07/urgence-nucleaire-fukushima

    Le Premier ministre japonais a annoncé que les autorités allaient davantage s’impliquer dans la gestion de l’eau contaminée de la centrale nucléaire de Fukushima, dont la fuite dans la mer constitue selon lui un problème « urgent ».

    Une situation d’urgence a été déclarée ce mercredi par l’Autorité de régulation nucléaire japonaise (NRA). De l’eau hautement radioactive se déverse dans l’océan Pacifique depuis la centrale nucléaire de Fukushima.

    Apparemment, pour les communicants de crise, après 30 mois on peut commencer à parler des problèmes et donner l’impression qu’on est en mesure d’y faire face.

    A la radio, on annonce que 300 m3 d’eau contaminée partent à l’océan chaque jour. Goutte d’eau dans l’océan ?

    #eau_contaminée

    • Magnifique encore (mai 2013 ce coup-ci) ! TEPCO maîtrise grave : juste ils envisagent de rejeter de l’eau stockée. Cela se gère un peu comme un supermarché une catastrophe nucléaire, en fait.

      Fukushima : Tepco envisage de rejeter en mer l’eau radioactive stockée dans la centrale - WikiStrike.com
      http://www.wikistrike.com/article-fukushima-tepco-envisage-de-rejeter-en-mer-l-eau-radioactive-sto

      Tepco, l’exploitant de Fukushima, ne sait plus quoi faire des dizaines de milliers de tonnes d’eau contaminée stockée dans les réservoirs de la centrale accidentée. Alors que la compagnie pensait pouvoir rejeter ces eaux dans l’océan Pacifique, les pêcheurs japonais s’y opposent farouchement, craignant une contamination environnementale.

      La compagnie d’électricité Tepco fait encore des siennes à Fukushima. Après avoir connu une série d’incidents à la centrale accidentée, l’opérateur est en effet de nouveau la cible de vives critiques. La raison ? L’idée que Tepco a eu pour se débarrasser de l’eau stockée à Fukushima.

      Avec les pêcheurs dans le rôle des vilains citoyens limite écologistes qui s’opposent pour le plaisir.

    • Une dernière (juillet 2013) :

      Fukushima : des éléments radioactifs à nouveau découverts dans l’eau souterraine | Fil info Monde - lesoir.be
      http://www.lesoir.be/276678/article/actualite/fil-info/fil-info-monde/2013-07-07/fukushima-des-elements-radioactifs-nouveau-decouverts-dans-l-eau-sou

      « Selon les échantillons analysés le 5 juillet (...), nous avons détecté un niveau record de 600.000 becquerels par litre » de tritium, dix fois supérieurs aux recommandations gouvernementales de 60.000 becquerels par litre, a indiqué l’opérateur Tepco.

      « Nous poursuivons nos efforts pour empêcher que la pollution prenne de l’ampleur (...) et allons renforcer tout le processus de contrôle », a de nouveau promis l’opérateur.

      A noter, le taux de radioactivité par litre excède juste une « recommandation gouvernementale », ils font des efforts et vont « renforcer » le contrôle. On sent bien que le renforcement est flagrant là depuis 2,5 ans ;-)

    • Ah oui... (je laisse passer plein de seens intéressants par manque de temps :-/).

      Il y en a une belle (au moins) aussi là :

      L’eau hautement radioactive qui se déverse dans l’océan à partir de la centrale nucléaire de Fukushima endommagée par un séisme et un tsunami il y a deux ans créée une « situation d’urgence » que son opérateur a du mal à contenir, a déclaré lundi un responsable de l’autorité nucléaire japonaise.

      Elle est « endommagée » parce qu’il n’y a que deux cœurs officiellement en train de fondre ? J’aurais tendance à parler de « site de la catastrophe nucléaire de Fukushima » plutôt que de « centrale nucléaire endommagée »...

    • Râââ, il faut suivre le tag #fukushima ^^.

      On trouve encore une réécriture à caractère rassurant amoindrissant apaisante magnifique (les adjectifs me manquent) http://seenthis.net/messages/154973

      L’autorité de sûreté nucléaire japonaise a indiqué mercredi qu’elle craignait que de l’eau contaminée souterraine de la centrale accidentée de Fukushima ne s’écoule dans la mer.

      A noter que c’est une remarquable initiative de prudence à caractère journalistique vu que d’après la même citation les experts parlent eux de « forts soupçons que l’eau hautement radioactive accumulée dans le sol ne se répande dans la mer ».

      Forts soupçons vs. craintes... Si on avait confié le dossier Berlusconi à ce genre de presse on en serait encore à « craindre » qu’il ait magouillé ? (rien à voir ok, je -> [ ])



  • Japan’s ’nuclear gypsies’ face radioactive peril at power plants - latimes.com
    http://www.latimes.com/news/nationworld/world/la-fg-japan-nuclear-gypsies-20111204,0,347252.story

    Temporary workers at the #Fukushima plant in 2010 also faced radiation levels 16 times higher than did employees of the plant’s owner-operator, Tokyo Electric Power Co., because contractors are called in for the most dangerous work, according to the government’s industrial safety agency.

    “This job is a death sentence, performed by workers who aren’t being given information about the dangers they face,” said Hiroaki Koide, an assistant professor at Kyoto University’s Research Reactor Institute and author of the book “The Lie of Nuclear Power.”

    #nucléaire #japon #travail


  • TEPCO: Radioactive substances belong to landowners, not us - AJW by The Asahi Shimbun
    http://ajw.asahi.com/article/behind_news/social_affairs/AJ201111240030

    During court proceedings concerning a radioactive golf course, Tokyo Electric Power Co. stunned lawyers by saying the utility was not responsible for decontamination because it no longer “owned” the radioactive substances.

    “Radioactive materials (such as cesium) that scattered and fell from the Fukushima No. 1 nuclear plant belong to individual landowners there, not TEPCO,” the utility said.

    #nucléaire #propriété

    • Dans le cadre de la campagne « humour, politesse du désespoir », j’ai éclaté de rire en lisant ça. Si, si, si, si... #lol donc.

      J’ai pas tout lu mais amha il auraient pu aussi dire « Le plaignant ne peux pas prouver que ces trucs viennent de chez nous... »


  • Inside Japan’s Fukushima Nuclear Power Station
    http://blogs.denverpost.com/captured/2011/11/14/inside-japans-fukushima-nuclear-reactor/5085

    Associated Press photographer David Guttenfelder, along with other reporters, was allowed inside the Fukushima nuclear power station to witness the devastation, for the first time, caused by Japan’s March 12th earthquake and tsunami.

    http://denverpost.slideshowpro.com/albums/001/496/album-281158/cache/powerplant043.sJPG_950_2000_0_75_0_50_50.JPG

    The Unit 4 reactor building at the crippled Tokyo Electric Power Co. (Tepco) Fukushima Dai-Ichi nuclear power station is seen through a bus window in Okuma Town, Fukushima Prefecture, Japan, on Saturday, Nov. 12, 2011. Tepco is struggling to contain the worst nuclear disaster in 25 years. Photographer: David Guttenfelder/Pool via Bloomberg


  • #Fukushima Desolation Worst Since Nagasaki as Residents Flee - Bloomberg
    http://www.bloomberg.com/news/2011-09-26/fukushima-desolation-worst-since-nagasaki-as-population-flees.html

    What’s emerging in Japan six months since the nuclear meltdown at the Tokyo Electric Power Co. plant is a radioactive zone bigger than that left by the 1945 atomic bombings at Hiroshima and Nagasaki. While nature reclaims the 20 kilometer (12 mile) no-go zone, Fukushima’s $3.2 billion-a-year farm industry is being devastated and tourists that hiked the prefecture’s mountains and surfed off its beaches have all but vanished.
    (...)
    The bulk of radioactive contamination cuts a 5 kilometer to 10 kilometer-wide swath of land running as far as 30 kilometers northwest of the nuclear plant, surveys of radiation hotspots by Japan’s science ministry show. The government extended evacuations beyond the 20-kilometer zone in April to cover this corridor, which includes parts of Iitate village.

    voir aussi la #carte de la radioactivité :
    http://radioactivity.mext.go.jp/ja/distribution_map_around_FukushimaNPP/0002/11555_0830.pdf

    #nucléaire #cartographie #japon



  • Two Other Nuclear Reactors Suffer Serious Damage - WSJ.com

    By MITSURU OBE

    TOKYO—Substantial damage to the fuel cores at two additional reactors of Japan’s Fukushima Daiichi nuclear complex has taken place, operator Tokyo Electric Power Co. said Sunday, further complicating the already daunting task of bringing them to a safe shutdown while avoiding the release of high levels of radioactivity. The revelation followed an acknowledgment on Thursday that a similar meltdown of the core took place at unit No. 1.

    View Full Image
    0515tepco
    European Pressphoto Agency

    Junichi Matsumoto, an official of Tokyo Electric Power Co. listens to questions during a press conference regarding the meltdown of Fukushima Daiichi nuclear power plant at the company headquarters in Tokyo, Japan, May 13, 2011.
    0515tepco
    0515tepco

    The operator of Japan’s stricken nuclear plant is using remote-controlled robots inside reactor buildings damaged by a hydrogen explosions to gauge radiation and temperature levels. Video courtesy of AFP and image courtesy of Associated Press.

    Workers also found that the No. 1 unit’s reactor building is flooded in the basement, reinforcing the suspicion that the containment vessel is damaged and leaking highly radioactive water.

    The revelations are likely to force an overhaul of the six- to nine-month blueprint for bringing the reactors to a safe shutdown stage and end the release of radioactive materials. The original plan, announced in mid-April, was due to be revised May 17.

    The operator, known as Tepco, said the No. 1 unit lost its reactor core 16 hours after the plant was struck by a magnitude-9 earthquake and a giant tsunami on the afternoon of March 11.

    The pressure vessel a cylindrical steel container that holds nuclear fuel, “is likely to be damaged and leaking water at units Nos. 2 and 3,” said Junichi Matsumoto, Tepco spokesman on nuclear issues, in a news briefing Sunday.

    He also said there could be far less cooling water in the pressure vessels of Nos. 2 and 3, indicating there are holes at the bottom of these vessels, with thousands of tons of water pumped into these reactors mostly leaking out.

    Tepco found the basement of the unit No. 1 reactor building flooded with 4.2 meters of water. It isn’t clear where the water came from, but leaks are suspected in pipes running in and out of the containment vessel, a beaker-shaped steel structure that holds the pressure vessel.

    Additional nuclear evacuations begin outside a 30 kilometer exclusion zone on fears of high levels of accumulated radiation. Video courtesy of Reuters and photo courtesy of Getty Images.

    The water flooding the basement is believed to be highly radioactive. Workers were unable to observe the flooding situation because of strong radiation coming out of the water, Tepco said.

    A survey conducted by an unmanned robot Friday found radiation levels of 1,000 to 2,000 millisieverts per hour in some parts of the ground level of unit No. 1, a level that would be highly dangerous for any worker nearby. Japan has placed an annual allowable dosage limit of 250 millisieverts for workers.

    The high level of radioactivity means even more challenges for Tepco’s bid to set up a continuous cooling system that won’t threaten radiation leaks into the environment.
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    Tepco separately released its analysis on the timeline of the meltdown at unit No. 1. According to the analysis, the reactor core, or the nuclear fuel, was exposed to the air within five hours after the plant was struck by the earthquake. The temperature inside the core reached 2,800 degrees Celsius in six hours, causing the fuel pellets to melt away rapidly.

    Within 16 hours, the reactor core melted, dropped to the bottom of the pressure vessel and created a hole there. By then, an operation to pump water into the reactor was under way. This prevented the worst-case scenario, in which the overheating fuel would melt its way through the vessels and discharge large volumes of radiation outside.

    The nuclear industry lacks a technical definition for a full meltdown, but the term is generally understood to mean that radioactive fuel has breached containment measures, resulting in a massive release of fuel.

    “Without the injection of water [by fire trucks], a more disastrous event could have ensued,” said Mr. Matsumoto.

    Tepco also released its analysis of a hydrogen explosion that occurred at unit No. 4, despite the fact that the unit was in maintenance and that nuclear fuel stored in the storage pool was largely intact.

    According to Tepco, hyrogen produced in the overheating of the reactor core at unit 3 flowed through a gas-treatment line and entered unit No. 4 because of a breakdown of valves. Hydrogen leaked from ducts in the second, third and fourth floors of the reactor building at unit No. 4 and ignited a massive explosion.

    http://online.wsj.com/article/SB10001424052748703509104576325110776621604.html


  • Core of reactor 1 melted 16 hours after quake | The Japan Times Online
    http://search.japantimes.co.jp/cgi-bin/nn20110516a1.html

    Monday, May 16, 2011

    Core of reactor 1 melted 16 hours after quake
    New analysis shows damage to fuel rods was surprisingly quick
    Kyodo

    The meltdown at reactor No. 1 in Fukushima happened more quickly than feared, Tokyo Electric Power Co. said Sunday in a new analysis.

    The core of the heavily damaged reactor at the Fukushima No. 1 power plant is believed to have melted 16 hours after the March 11 mega-quake and tsunami rocked the complex in northeastern Japan.

    Preliminary analysis shows that No. 1 had already entered a critical state by 6:50 a.m. on March 12, with most of its fuel having melted and fallen to the bottom of the pressure vessel, the plant operator said. Tepco released data Thursday showing some of the fuel rods had melted.

    The reactor automatically halted operations immediately after the 2:46 p.m. quake, but the water level in the reactor dropped and the temperature began rising at around 6 p.m. The damage to the fuel rods had begun by 7:30 p.m., with most of them having melted by 6:50 a.m. the following day, the utility said.

    While the utility had planned to bring the nation’s worst nuclear accident under control in around six to nine months from mid-April, it now has no choice but to abandon a plan to flood the containment vessel of reactor 1 because holes have been created by the melted fuel, an adviser to Prime Minister Naoto Kan said earlier Sunday.

    Nevertheless, Goshi Hosono, the top official tasked with handling the nuclear crisis, told TV programs the government had yet to revise the timetable for bringing the crisis to an end.

    Asked about initial plans to completely submerge the 4-meter-tall fuel rods by entombing the vessel in water, Hosono said, “We should not cause the (radioactive) water to flow into the sea by taking such a measure.”

    Hosono said the government will instead consider ways to decontaminate the water being used to cool the fuel so that it can be recirculated instead of letting it flood the facility.

    Hosono made the remarks after Tepco discovered a pool of water more than 4 meters deep and exceeding 3,000 tons in the basement of reactor No. 1. This suggests that the water, which is likely highly radioactive, is seeping through the holes after being injected into the reactor core.

    From there, it is probably leaking from either the containment vessel or the suppression pool, which enclose the pressure vessel, and into the piping.

    In a related revelation concerning a major mixup after the six-reactor complex lost power, Tepco and other sources said the same day that the utility had assembled 69 power supply vehicles at the plant by March 12 but that these proved virtually useless.

    The inability to use the vehicles delayed the damage control work at the plant, significantly worsening the emergency.

    Tepco earlier said it had tried to connect the vehicles to power-receiving equipment needed to operate the water pumps intended to cool down the reactors. But this failed because the equipment was submerged in seawater from the tsunami, which posed the risk that the equipment would short out.

    Tepco’s account conflicts with the one detailed by the Nuclear and Industrial Safety Agency, which mentioned the first arrival of such a vehicle on the evening of March 11 but stopped mentioning it the following day, as the focus of attention had shifted to the need to release radioactive steam to relieve pressure that had built up inside the containment vessel of reactor 1.

    The different versions of the story given by Tepco and the agency might come to a head as investigations progress to determine why efforts to immediately contain the crisis failed.