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Talk:Fukushima nuclear accident (Unit 2 Reactor)

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"Radiation spike"

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Latest comment: 7 years ago3 comments2 people in discussion

I removed a section about a radiation "spike". This was taken out of context by media organizations and not accurate (see link below) Cameras were sent into the containment directly underneath the reactor for the first time ever in Jan 2017 and measured very high radiation dose rates. This was a first time measurement and is expected for this location under the reactor because that is where the core melt is located. Radiation levels outside and around the plant remain unchanged. Furthermore, this is not a radiation increase, spent fuel produces over 10000 Sv/hr of radiation, so this radiation is due to the core melt from 2011 and not a new increase. There is also no evidence that the unit 2 core melted through the containment, and the camera recordings suggest that only a limited amount of core material melted out of the reactor vessel, not enough to cause containment melt.

http://www.tepco.co.jp/en/announcements/2017/1374451_10494.html — Preceding unsigned comment added by 50.81.208.229 (talk)

Please sign your edits. Please refrain from removing sections with credible references, as that is NPOV behavior. The work "spike" has been modified to elevated levels. Netherzone (talk) 17:51, 8 February 2017 (UTC)Reply
The radiation levels aren't the real story here. The real story is that for the first time, TEPCO has been able to get a camera directly underneath the unit 2 reactor vessel and get a picture of the core melt and damage. The radiation measurement is only one piece of the story which the media incorrectly picked up as an "increasing level", and did not report the actual noteworthy news, that these measurements indicate that the core melt is located in the bottom head and the "subpile" pit below the reactor. I'm working on modifying the section to better present the information.
The sources are not credible, as many are incorrectly reporting the original TEPCO press releases, which is why TEPCO had to release another statement today clarifying that.— Preceding unsigned comment added by 50.81.208.229 (talk)
MSM sources were about factual. But as IP said, it seems the yellow press tried to "make news" by dramatic headers. Tweaking of "highest observed radiation level inside the building" to oddities like "shocking elevation in the radiation readings." --J. Sketter (talk) 20:41, 8 February 2017 (UTC)Reply
Forbes, Smithsonian, Japan Today and Japan Times are not the "yellow press". Please discontinue removing citations, as it is disruptive. Netherzone (talk) 22:12, 8 February 2017 (UTC)Reply
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Temp holding spot for excess info

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The heat and pressure of the melting Unit 2 reactor caused a reaction between the nuclear fuel metal cladding and the remaining water producing explosive hydrogen gas. As workers struggled to cool and shut down the reactor, several hydrogen-air chemical explosions occurred.[1][2] Concerns about the repeated small explosions, the atmospheric venting of radioactive gasses, and the possibility of larger explosions led to a 20 km (12 mi)-radius evacuation around the plant. During the early days of the accident workers were temporarily evacuated at various times for radiation safety reasons. At the same time, sea water that had been exposed to the melting rods was returned to the sea heated and radioactive in large volumes for several months until recirculating units could be put in place to repeatedly cool and re-use a limited quantity of water for cooling. The earthquake damage and flooding in the wake of the tsunami hindered external assistance. Electrical power was slowly restored for some of the reactors, allowing for automated cooling.[3]

Japanese officials initially assessed the accident as Level 4 on the International Nuclear Event Scale (INES) despite the views of other international agencies that it should be higher. The level was later raised to 5 and eventually to 7, the maximum scale value.[4] The Japanese government and TEPCO have been criticized in the foreign press for poor communication with the public and improvised cleanup efforts.[5][6][7] On 20 March, the Chief Cabinet Secretary Yukio Edano announced that the plant would be decommissioned once the crisis was over.

The Japanese government estimates the total amount of radioactivity released into the atmosphere was approximately one-tenth as much as was released during the Chernobyl disaster.[8] Significant amounts of radioactive material have also been released into ground and ocean waters. Measurements taken by the Japanese government 30–50 km from the plant showed caesium-137 levels high enough to cause concern,[9] leading the government to ban the sale of food grown in the area. Tokyo officials temporarily recommended that tap water should not be used to prepare food for infants.[10][11] In May 2012, TEPCO reported that at least 900 PBq had been released "into the atmosphere in March last year [2011] alone" although it has been said staff may have been told to lie, and give false readings to try and cover up true levels of radiation.[12][13]

On 16 December 2011, Japanese authorities declared the plant to be stable, although it would take decades to decontaminate the surrounding areas and to decommission the plant altogether.[14] On 5 July 2012, the parliament appointed The Fukushima Nuclear Accident Independent Investigation Commission (NAIIC) submitted its inquiry report to the Japanese parliament,[15] while the government appointed Investigation Committee on the Accident at the Fukushima Nuclear Power Stations of Tokyo Electric Power Company submitted its final report to the Japanese government on 23 July 2012.[16] Tepco admitted for the first time on 12 October 2012 that it had failed to take stronger measures to prevent disasters for fear of inviting lawsuits or protests against its nuclear plants.[17][18][19][20]

The highest level of radiation released by reactor #2 was recorded on 2 February 2017, at 730 Sieverts per hour.[21][22][23]

References

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References

  1. ^ Cite error: The named reference IAEA15March was invoked but never defined (see the help page).
  2. ^ Hydrogen explosions Fukushima nuclear plant: what happened? Archived 2 December 2013 at the Wayback Machine
  3. ^ Stricken reactors may get power Sunday, The Wall Street Journal, 19 March 2011
  4. ^ Justin McCurry. Japan raises nuclear alert level to seven. The Guardian. 12 April 2011
  5. ^ Wagner, Wieland (15 March 2011). "Problematic public relations: Japanese leaders leave people in the dark". Der Spiegel. Retrieved 19 March 2011.
  6. ^ "China urges Japan's openness amid panic buying of salt". Channel NewsAsia. Agence France-Presse. 17 March 2011. Archived from the original on 22 April 2018. Retrieved 17 March 2011.
  7. ^ Cite error: The named reference Hackenbroch was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference Frank N. von Hippel 27–36 was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference NewScie2 was invoked but never defined (see the help page).
  10. ^ Japan mulls Fukushima food ban: IAEA, Reuters, 19 March 2011
  11. ^ Justin McCurry in Osaka (23 March 2010). "Tokyo water unsafe for infants after high radiation levels detected". The Guardian. London. Retrieved 23 March 2011.
  12. ^ "TEPCO puts radiation release early in Fukushima crisis at 900 PBq". Kyodo News. 24 May 2012. Archived from the original on 24 May 2012. Retrieved 24 May 2012.
  13. ^ Kevin Krolicki (24 May 2012). "Fukushima radiation higher than first estimated". Reuters. Retrieved 24 May 2012.
  14. ^ "Japan PM says Fukushima nuclear site finally stabilised". BBC Online. 16 December 2011. Retrieved 7 January 2012.
  15. ^ National Diet of Japan Fukushima Nuclear Accident Independent Investigation Commission. "国会事故調 | 東京電力福島原子力発電所事故調査委員会のホームページ". National Diet of Japan Fukushima Nuclear Accident Independent Investigation Commission. Archived from the original on 19 January 2013. Retrieved 9 July 2012.
  16. ^ "UPDATE: Government panel blasts lack of 'safety culture' in nuclear accident". The Asahi Shimbun. 23 July 2012. Archived from the original on 13 April 2014. Retrieved 29 July 2012.
  17. ^ Fackler, Martin (12 October 2012). "Japan Power Company Admits Failings on Plant Precautions". The New York Times. Retrieved 13 October 2012.
  18. ^ Sheldrick, Aaron (12 October 2012). "Fukushima operator must learn from mistakes, new adviser says". Reuters. Retrieved 13 October 2012.
  19. ^ Yamaguchi, Mari (12 October 2012). "Japan utility agrees nuclear crisis was avoidable". Boston.com. Associated Press. Retrieved 13 October 2012.
  20. ^ "Japanese nuclear plant operator admits playing down risk". CNN Wire Staff. CNN. 12 October 2012. Retrieved 13 October 2012.
  21. ^ Cite error: The named reference Japan Today was invoked but never defined (see the help page).
  22. ^ Cite error: The named reference Forbes was invoked but never defined (see the help page).
  23. ^ Cite error: The named reference Japan Times was invoked but never defined (see the help page).
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