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Overview of facility of Fukushima Daiichi Nuclear Power Station

  • *We abolished the units 1-4 of Fukushima Daiichi Nuclear Power Plant on April 19, 2012 in accordance with the Electric Utility Industry Law article9.
  • *We abolished the units 5,6 of Fukushima Daiichi Nuclear Power Plant on January 31, 2014 in accordance with the Electric Utility Industry Law article9
  Unit 1 Unit 2 Unit 3 Unit 4 Unit 5 Unit 6
Main specifications Electric output(MW) 460 784 784 784 784 1,100
Start of Constraction Work 1967/9 1969/5 1970/10 1972/9 1971/12 1973/5
Start of Commercial Operation 1971/3 1974/7 1976/3 1978/10 1978/4 1979/10
Reactor type Boiling Water Reactor(BWR)
Type of PCV Mark I Mark II
Domestic Content(%) 56 53 91 91 93 63
Main contractor GE GE,Toshiba Toshiba Hitachi Toshiba GE,Toshiba
Nuclear reactor Heat output(MW) 1,380 2,381 3,293
Number of Fuel Assemblies Loaded(Pieces) 400 548 764
Full length of Fuel Assemblies(m) approx.4.35 approx.4.47 approx.4.47
Number of Control rod(Pieces) 97 137 185
Reactor Pressure Vessel (RPV) Inner dia.(m) approx.4.8 approx.5.6 approx.6.4
Height(m) approx.20 approx.22 23
Total weight(ton) 440 500 750
Primary Containment Vessel (PCV) Height(m) approx.32 approx.33 approx.34 approx.48
Diameter of cylindrical portion(m) approx.10 approx.11 approx.10(top)
Diameter of spherical portion(m) approx.18 approx.20 approx.25(bottom)
Suppression pool Water Amount(ton) 1,750 2,980 3,200
Steam turbine Number of Revolutions(rpm) 1,500
Steam temp.(℃) 282
Steam pressure(kg/cm2g) 66.8
Fuel type Uranium dioxide
Uranium(ton) 69 94 132
Fuel Assemblies 400 548 764

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