Willkommen zum Fukushima-Info- und -Diskussions-Forum des physikBlogs.

Die Zahl der Kommentare auf unsere Fukushima-Beiträge ist jenseits der 1000er Marke. Es wird zu unübersichtlich!
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Zu einer kleinen Einführung, hier entlang.

Ihr seid neu hier? Das physikBlog hat in vier Artikeln den Unfall von Fukushima begleitet. Eine Lektüre, zumindest des Aktuellsten, empfiehlt sich vor dem Mitdiskutieren!

Es sei erwähnt, dass wir bei der Moderation der Kommentare hier weniger streng sind, als im Blog. Ihr seid freier in eurer Themenwahl.

Viel Spaß, André & Andi vom physikBlog.

Fukushima 2 Daini
  • TimTim Juni 2011
    Ein eigener Thread macht wohl Sinn.
  • TimTim Juni 2011
    Vorsicht geht um Fukushima 2 Daini (die Anlage im Süden von I im Cold Shutdown)

    > #Fukushima II (Not I) Nuke Plant Wants to Dump 3,000 Tons of Water into the Ocean
    http://ex-skf.blogspot.com/2011/06/fukushima-ii-not-i-nuke-plant-wants-to.html

    Did you even know that there was water in the basement of Fukushima II ("Daini")? And that water needs to be treated to remove the radioactive materials?

    TEPCO fears that the power supply equipments in the basements may degrade from the salt water from tsunami, but if they have been sitting in the salt water for nearly 3 months, they are practically worthless, I would assume.



  • TimTim Juni 2011
    Silene:
    Ich kann ja nachvollziehen, dass nach dem Tsumami auch bei Daiini Wasser im Keller steht, aber warum zum Teufel ist es radioaktiv?
  • TimTim Juni 2011
    > #Fukushima II's Contaminated Water: Cobalt-60, Cesium-134, Cesium-137
    http://ex-skf.blogspot.com/2011/06/fukushima-iis-contaminated-water-cobalt.html

    TEPCO disclosed on June 8 that it has entered into negotiations with the government agencies and local municipalities to treat the contaminated water in the basements of the buildings at Fukushima II Nuclear Power Plant and release it into the ocean.

    The water is from the tsunami [on March 11], and it contains radioactive cobalt-60 which probably came from the rusty pipes, and cesium-137 and cesium-134 which are considered to have flown from Fukushima I Nuclear Power Plant 10 kilometers north. The level of contamination is 10 to 30 times the limit allowed for the discharge into the ocean.


    Mainichi Shinbun Japanese reports the level of radioactive materials is "normal" for a nuclear plant during the normal operation.
    Hmmm. So, in a normal operation, radioactive cesium will fly from a nearby nuke plant and somehow land on the basement of the enclosed reactor building. Right.

    TEPCO's press release on the subject is not up yet.


  • TimTim Juni 2011
    Kommentar von Nigel W.:

    Indeed, HOW COME the water in the basements is so radioactive that they have to treat it before they release it?

    And how come its sea water?

    If the reactors themselves were leaking then I would expect the event would trend towards Fuk 1′s condition fairly promptly.

    A more likely source is one or more spent fuel pools, since they are full of radioactive water, and probably now cracked by the earthquake, and apparently being cooled with sea water!

    3000 tonnes accumulated (unnoticed, apparently, which seems strange?) over the last 84 days works out to be 35 tonnes a day, equals about 25 litres a minute. Thats a decent leak.

    Ooh darn!


    Source: http://ex-skf.blogspot.com/2011/06/fukushima-ii-not-i-nuke-plant-wants-to.html
  • SileneSilene Juni 2011
    [EX-SKF] Fukushima II's Contaminated Water: Cobalt-60, Cesium-134, Cesium-137
    From Yomiuri Shinbun (1:28PM JST 6/8/2011):
    The water is from the tsunami [on March 11], and it contains radioactive cobalt-60 which probably came from the rusty pipes, and cesium-137 and cesium-134 which are considered to have flown from Fukushima I Nuclear Power Plant 10 kilometers north. The level of contamination is 10 to 30 times the limit allowed for the discharge into the ocean.

    Der zulässige Grenzwert zur Einleitung in den Ozean liegt m.W. bei 60 Bq/l für Cs-134 und 90 Bq/l für Cs-137. Das bedeutet, dass im Keller von Daiini 3000 m³ Salzwasser mit 1500-4500 Bq/l Radiocaesium herumschwappen. Und diese Menge Caesium soll über die Luft eingetragen worden sein?

    Co-60 (HWZ: über 5 Jahre) kann, wenn ich das richtig sehe, durch Betazerfall aus Titan-60 (über Vanadium-60, Chrom-60, Mangan-60 und Eisen-60) entstehen. Eine mögliche Quelle wären demnach neutronenbestrahlte Titan- oder Edelstahlbauteile. Ist in Daiini etwa der primäre Kühlkreislauf undicht?
  • SileneSilene Juni 2011
    Die Asahi Shimbun schreibt dazu:
    The contaminated water at the No. 2 plant contains radioactive elements such as manganese and cobalt, which usually originate from metal corrosion, but elements such as iodine and caesium that originate from damaged nuclear fuel have not been detected, said Hidehiko Nishiyama, deputy director general of the Nuclear and Industrial Safety Agency (NISA) which oversees TEPCO's activities.
    Radioaktive Isotope entstehen also durch Korrosion von Metallen? Na klar. Und das Caesium, das eben noch 10-30fach über dem Grenzwert lag, ist nun plötzlich nicht mehr nachweisbar.
  • TimTim Juni 2011
    Ich verstehe den Kontext der Meldung nicht. Gibt es einen Zusammenhang zu vorherigen Meldungen oder ist das ein neues Problem?
  • SileneSilene Juni 2011
    Zwischen dem radioaktiven Wasser im Keller und dem Schaden am Abluftkanal besteht vermutlich kein kausaler Zusammenhang (wenn man mal davon absieht, dass es sich bei beiden Problemen um Folgen des Bebens handelt). Wirft jedenfalls kein gutes Licht auf den Zustand der Anlage.
  • SileneSilene Juni 2011
    Überraschung:

    [TEPCO] Installation of the temporary differential pressure gauge at Fukushima Daini Nuclear Power Station
    Install a temporary lack (differential pressure gauge and pressure gauge in the dotted line) to the permanent pressure gauge and fill water. Monitoring and confirmation of the indicated value of the differential pressure gauge and the pressure gauge will be implemented afterwards.
  • dirkdirk Juni 2011
    evtl Übersetzungsfehler??
  • SileneSilene Juni 2011
    Hoffentlich...
  • dirkdirk Juni 2011
    Man scheint einen neuen Übersetzer zu haben der es scheinbar nicht ganz so drauf hat.
  • Der Nutzer und alle zugehörigen Inhalte wurden gelöscht.
  • dschroedschroe Juli 2011
    [TEPCO] Press Release (Jul 07,2011)
    Plant Status of Fukushima Daini Nuclear Power Station (as of 3:00 pm, July 7)

    At 2:05 pm on July 7, a labor found a spark in the breaker of power panel
    while a labor investigated the power panel in the first floor of basement
    of reactor building of Unit 1. At 2:30 pm on July 7, TEPCO workers confirmed.
    Afterwards, we will open the connecting breaker that supplies electricity
    to the breaker and investigate the cause of a spark.

    Due to the investigation, we will stop residual heat removal system (B) and
    continue to operation to manage the temperature of reactor building and
    spent fuel pool.

    http://www.tepco.co.jp/en/press/corp-com/release/11070714-e.html
  • Der Nutzer und alle zugehörigen Inhalte wurden gelöscht.
  • Der Nutzer und alle zugehörigen Inhalte wurden gelöscht.
  • TimTim Januar 2012
    > Japan Nuclear Energy Safety Organization | Activity Information | Operational Status of Nuclear Facilities in Japan | 2011 Edition
    http://www.jnes.go.jp/english/activity/unkan/e-unkanhp2/e-unkanhp2-2011/book1/index.html#page=1

    715 Seiten Report für den Zeitraum April 2010 bis März 2011. Insofern ist das jetzige Unglück darin kaum n Thema.
    Zu Daini gibt es jedoch Bilder und Details der Überschwemmung des Tsunamis.

    Am besten als PDF laden. Die Ansicht im Browser ist sehr lahm..
  • TimTim Januar 2012
    > Just In: Japanese Expert Says Fukushima II (not I) Nuke Plant's Containment Vessel Has Been Damaged by the Quake | EX-SKF
    http://ex-skf.blogspot.com/2012/01/japanese-expert-says-fukushima-ii-not-i.html

    Information from Iwakami Yasumi's USTREAM channel netcasting the workshop of an Osaka citizens' group "Kansai network to stop the disaster-debris acceptance" with a panel of experts including European experts.

    One Japanese expert, Hiromitsu Ino, said a Containment Vessel at Fukushima II (Daini) is broken, and they are trying to repair it. It was probably caused by the earthquake, not tsunami.

    The workshop is on-going at this link:
    http://www.ustream.tv/channel/iwj-osaka1#utm_campaign=t.co&utm_source=8481429&utm_medium=social

    Hiromitsu Ino is professor emeritus at Tokyo University. His area of specialty is metallic materials science. He is the head of the Group of Concerned Scientists and Engineers Calling for the Closure of the Kashiwazaki-Kariwa Nuclear Power Plant.

    I still remember a tweet last summer (I think) saying an acquaintance fleeing from the area near Fukushima II Nuke Plant right after the earthquake saw a smoke coming out of one of the reactor buildings (there are 4). Fukushima II, unlike Fukushima I, has 4 Mark-II type boiling water reactors built by Toshiba and Hitachi.


  • TimTim Januar 2012
    < Gov't tells TEPCO to prepare repair plan for Fukushima Daini equipment - The Mainichi Daily News
    http://mdn.mainichi.jp/mdnnews/news/20120112p2g00m0dm035000c.html

    The Nuclear and Industrial Safety Agency told Tokyo Electric Power Co. on Wednesday to prepare a report by the end of January on how to repair equipment at its Fukushima Daini nuclear power plant damaged by the March 2011 earthquake and tsunami, a senior agency official said.

    The report is needed to "further ensure" the plant will remain in a stable state of cold shutdown, Kenji Matsuoka, chief of the disaster prevention section at the agency, said at a press conference, denying it is aimed at requiring the utility, known as TEPCO, to prepare for restarting the plant.

    A cold shutdown is defined as a condition in which the bottom part of a reactor pressure vessel is kept below 100 C and exposure from the release of radioactive substances is being significantly contained.

    The Fukushima Daini nuclear power plant was not so fatally damaged as the nearby Fukushima Daiichi plant by the magnitude-9.0 earthquake and subsequent tsunami. In December, the government lifted its declaration of a state of emergency at the Fukushima Daini plant.

    But facilities at the plant, including the emergency power generator and the cooling system for spent nuclear fuel pools, have been damaged, according to the agency.


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