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    UK Government grants consent for Vattenfall’s Norfolk Vanguard Offshore Wind Farm

    New DNV GL class rules for floating offshore wind energy expands industry horizon

    Norway to launch 1.5 gigawatt offshore wind tender

    Atlas and Hitachi to develop energy storage systems for renewable projects

    Velto Renewables supports the 360 MW offshore wind farm London Array

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    Array Technologies increased revenue 35% to US$872.7 million in 2020

    Array Technologies increased revenue 35% to US$872.7 million in 2020

    Nordex Group: half-year sales rise to EUR 2 billion, earnings impacted by COVID-19

    Nordex Group: half-year sales rise to EUR 2 billion, earnings impacted by COVID-19

    GE Renewable Energy connects the world's most powerful hydro unit to the grid in Wudongde, China

    GE Renewable Energy connects the world’s most powerful hydro unit to the grid in Wudongde, China

    Ferroglobe Hydro power

    Ferroglobe completes sale of Spanish hydro facilities to TPG Sixth Street Partners

    Intersolar, EES and Power2drive NA Acquired by Diversified Communications

    Intersolar, EES and Power2drive NA Acquired by Diversified Communications

    Summit Energy Services Announces Merger with Schneider Energy Consulting

    SeaMade secures €250m European loan for Belgian offshore wind farms

    SeaMade secures €250m European loan for Belgian offshore wind farms

    Xcel Energy agrees to buy Mankato Energy Center for $650m

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    Intersolar Europe 2022: Solar Energy in Germany Takes Center Stage

    Protermosolar adds value to the Spanish concentrated solar power industry in China

    SPI Energy Develops Utility Scale Solar Project in Maryland

    Lightsource BP pioneers UK's first night-time solar service

    Altus Power and Heliene Establish Strategic Partnership to Support U.S. Solar Module Manufacturing

    EDP signs a Build & Transfer Agreement for a 200 MWac solar project in the U.S.

    I&M is Powering the Next Tomorrow with Plans to Add More than 2,000 MW of Solar

    WindEurope Annual Event 2022 in Bilbao - Registrations Open, Conference Programme Available

    WindEurope Annual Event 2022 in Bilbao – Registrations Open, Conference Programme Available

    RWE chooses Chantiers de l'Atlantique as key supplier for its F.E.W Baltic II wind farm - design, construction and installation of the electrical offshore substation

    RWE chooses Chantiers de l’Atlantique as key supplier for its F.E.W Baltic II wind farm – design, construction and installation of the electrical offshore substation

    EGAT deploys Siemens software solutions for the worlds largest Hydro-Floating Solar Hybrid Project

    EGAT deploys Siemens software solutions for the world’s largest Hydro-Floating Solar Hybrid Project

    Protermosolar adds value to the Spanish concentrated solar power industry in China

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    GE’s digital power transformers selected for multiple projects across the globe

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Home Asia Pacific

Fukushima Dai-Ichi Nuclear Power Station

in Asia Pacific, Nuclear Power, Projects

The Fukushima Dai-Ichi Nuclear Power Station is located in the towns of Futaba and Ohkuma, 250km north of Tokyo city in Japan. The first unit of the nuclear station was commissioned in 1971. In total the station has six boiling water reactors which together have a power generation capacity of 4.7GW.

Fukushima Dai-Ichi was the first nuclear plant to be constructed and operated entirely by Tokyo Electric Power Company (TEPCO).

Units 1, 2, 3 and 4 of the nuclear complex were damaged in a series of events after the 11 March 2011 earthquake (Tohoku-Chihou-Taiheiyou-Oki Earthquake) and tsunami that struck the nation.

The earthquake had cutoff the power supply needed to pump cooling water into the damaged reactors. A portion of the fuel rods which create heat through nuclear reaction was exposed due to the failure of the cooling system caused by the tsunami. This failure resulted in nuclear explosion in the reactors.

Efforts to cool the reactor vessels with seawater and boric acid failed. The evacuation zone around the nuclear complex was doubled from six to 12 miles and was further extended to 30km radius after the explosion of Unit 3.

Plant details

 

The total installed capacity of the six boiling water reactor units is 4,696MW. Unit 1 has an installed capacity of 460MW, Units 2, 3, 4 and 5 each have 784MW capacity and Unit 6 is rated at 1,100MW.

“The total installed capacity of the six boiling water reactor units is 4,696MW.”

Units 1 to 5 are Mark I type while Unit 6 is a Mark II built with containment structures. All the reactors except Unit 3 continued using low enriched uranium (LEU). Unit 3 was being fed with mixed-oxide (MOX) fuel since September 2010.
Unit 1 was scheduled for closure in 2011. It was however granted an extension of further 10 years by the Japanese regulators in February 2011.

Development

 

The six reactors were designed by GE. The architectural design was provided by Ebasco.
GE also supplied the Units 1, 2 and 6. Units 3 and 5 were supplied by Toshiba and Unit 4 by Hitachi.
The nuclear complex was constructed by Kajima.

Reactors

 

The reactor units 1, 3 and 4 were automatically shut down following the earthquake.

The earthquake measured 8.9 on the Richter magnitude scale, which was much more than the plant’s bearing capacity. The remaining two units 5 and 6 were also shut down for regular inspection.

The emergency onsite generation had failed to provide the necessary backup power needed to support the critical instruments and control systems. Even the special cooling system known as the reactor core isolation cooling system that uses waste heat to run the critical systems could not provide the power needed to operate the control systems.

“Fukushima Dai-Ichi was the first nuclear plant to be constructed and operated by TEPCO.”

Unit 1 exploded on 12 March 2011 knocking down the external concrete building. However, the reactor and the steel containment structure remained intact. The radiation levels rose to 1015 microsievert, which is equivalent to the maximum permissible level for a year in a single day.

The explosion of Unit 1 has been classified as a ‘level 4 accident with local consequences’ on the International Nuclear and Radiological Event Scale (INES). This scale measures 0-7 (from deviation-no safety significance – major accident) and is used to communicate the safety significance of events associated with radiation sources.

Unit 3 exploded due to hydrogen ignition on 14 March 2011. Pressure in the reactor was built-up to 530 kiloPascals (kPa) even while sea water was being injected into the reactor to control the radiation.

On the same day, the fifth floor of Unit 4 building was damaged. Fire was sighted in the north-west part of the fourth floor and efforts to put it out were initiated immediately.

The reactor Core Isolation system of Unit 2 had also stopped functioning, resulting in a third explosion in the suppression chamber.

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