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Overview of facility of Fukushima Daini Nuclear Power Station

  Unit 1 Unit 2 Unit 3 Unit 4
Main specifications Electric output(MW) 1,100 1,100 1,100 1,100
Start of Constraction Work 1975/11 1979/2 1980/12 1980/12
Start of Commercial Operation 1982/4 1984/2 1985/6 1987/8
Reactor type Boiling Water Reactor(BWR)
Type of PCV Mark II Mark II
Domestic Content(%) 98 99 99 99
Main contractor Toshiba Hitachi Toshiba Hitachi
Nuclear reactor Heat output(MW) 3,293
Number of Fuel Assemblies Loaded(Pieces) 764
Full length of Fuel Assemblies(m) approx.4.5
Number of Control rod(Pieces) 185
Reactor Pressure Vessel(RPV) Inner dia.(m) approx.6.4
Height(m) approx.23
Total weight(ton) approx.750
Primary Containment Vessel(PCV) Height(m) approx.48
Diameter of spherical portion(m) approx.26 approx.29
Suppression pool Water Amount(ton) 3,400 4,000
Steam turbine Number of Revolutions(rpm) 1,500
Steam temp.(℃) 282
Steam pressure(kg/cm2g) 66.8
Fuel type Uranium dioxide
Uranium(ton) 132
Fuel Assemblies(Pieces) 764
Building Reactor Building Ground height approx.58m, Under ground depth approx.18m(6 floors above ground,two below floors)
Turbine Building Ground height approx.33m, Under ground depth approx.15m
Radioactive Waste Bilding(common facility) Ground height approx.41m, Under ground depth approx.18m(6 floors above ground,two below floors)
Exhaust Stack Ground height approx.120m, above sea level approx.150m

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