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Japan Tsunami
8.8, 8.9, 9.0 and even 9.1 earthquake in Japan March 11th 2011,  <br>Earthquake & Tsunami aftermath,  <br>Fukushima
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Japanese admit nuclear failures

Japanese admit nuclear failures | Japan Tsunami | Scoop.it
Japan was unprepared for a nuclear accident on the scale of the one at the Fukushima plant, the government said in a report to be submitted to the IAEA.

The report says poor oversight may also have contributed to the crisis.

The authorities have pledged to make the country's nuclear regulator (Nisa) independent of the industry ministry, which also promotes nuclear power.

It comes after Nisa doubled its initial estimate of leaked radiation in the first week after the disaster.

The nuclear safety agency now says 770,000 terabecquerels escaped into the atmosphere following the 11 March disaster - more than double its earlier estimate of 370,000 terabecquerels.

Although the amount is just 15% of the total released at Chernobyl in Ukraine in 1986 - the world's worst nuclear disaster - it suggests the contamination of the area around the plant is worse than first thought.

More than 80,000 local residents living within a 20km (12 mile) radius of the plant have been evacuated from their homes. A voluntary evacuation policy is operating in the area 20-30km from the plant.

Nearly three months into the crisis, the Fukushima Daiichi plant is still leaking radioactive material.

Chief Cabinet Secretary Yukio Edano says more evacuations are being considered. Monitoring shows the lie of the land and wind patterns may be causing a build-up of radiation in other areas.

Lessons learned
The government admitted that it was unprepared for a severe accident, in a report by Japan's nuclear emergency taskforce, to be handed in to the IAEA later this month.

''We are taking very seriously the fact... that consistent preparation for severe accidents was insufficient.

"In light of the lessons learned from the accident, Japan has recognised that a fundamental revision of its nuclear safety preparedness and response is inevitable,'' the taskforce said in an outline of the report.

The report also confirms that three reactors went into meltdown earlier than previously thought when the earthquake and tsunami knocked out cooling systems and back-ups.

Earlier, Nisa said that in reactor No 1, molten nuclear fuel dropped to the bottom of the pressure vessel within five hours of the quake - 10 hours earlier than initially estimated by operator Tepco.

The safety agency also said a meltdown damaged the No 2 reactor after 80 hours, and the No 3 reactor after 79 hours of the twin natural disasters.

But the government says it is still on track to bring the reactors at Fukushima to a cold shutdown by January at the latest.

The government report comes as an independent 10-member expert panel begins an investigation into the causes of the nuclear accident.

An investigation by the UN's nuclear watchdog, the IAEA, has already pointed out a key failure - admitted by Japan - to plan for the risk of waves crashing over the sea wall and knocking out the plant's back-up generators.

Even though a major faultline lies just offshore, the sea wall at Fukushima was less than 6m (20ft) high. The height of the tsunami wave was about 14m.

In its draft report, the IAEA said continued monitoring of the health and safety of the nuclear workers and the general public was necessary.

The report also emphasised the importance of independent regulators in the nuclear industry.

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IAEA Fact Finding Mission to Japan : un album sur Flickr

The International Atomic Energy Agency (IAEA) organized and dispatched to Japan an International Fact-finding Mission on 22 May, following its agreement with the Government of Japan. It includes fact-finding activities at Tokyo Electric Power Company's Fukushima Dai-ichi Nuclear Power Station and other locations. From 24 May to 2 June 2011, international experts from a dozen countries and IAEA experts are participating in the mission led by Mr. Mike Weightman, HM Chief Inspector of Nuclear Installations of the United Kingdom. They will make a preliminary assessment of the safety issues linked with TEPCO's Fukushima Dai-ichi Nuclear Power Station accident following the Great East Japan Earthquake and Tsunami. Also, they will identify areas that need further exploration or assessment based on the IAEA safety standards. In the course of the IAEA mission, the international experts will become acquainted with the Japanese lessons learned from the accident and will share their experience and expertise in their fields of competence with the Japanese authorities.

Mr. Weightman will present the mission's report at the Ministerial Conference on Nuclear Safety organised by the IAEA in Vienna from 20 to 24 June 2011, as an important input in the process of reviewing and strengthening the global nuclear safety framework that will be launched by the Conference.
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