Environmental Preservation Measures at Kaminoseki

1.Plan Outline of the Kaminoseki Nuclear Power Station

Power station construction plan


Nagashima, Oaza, Kaminoseki-cho, Kumage-gun, Yamaguchi Prefecture


The planned construction site for this power station faces the Seto Inland Sea on the westernmost tip of Nagashima in Kaminoseki-cho, Kumage-gun in the southeast corner of Yamaguchi Prefecture.

Power station outline
  Nuclear reactor Output
Unit 1 Improved boiling water reactor (ABWR) 1.373 million kW
Unit 2 1.373 million kW

Power station site

A. Area of power station site
Approximately 1.6 million m2 (area reclaimed from the sea: approximately 140,000m2)

B. Area of power station facilities
Approximately 510,000m2

Construction process (planned)

  Start of plan Start of construction Start of commercial operations
Unit 1 June 2001 undetermined undetermined
Unit 2 June 2001 undetermined undetermined

(According to the 2012 power supply plan)

2.Arrangement Plan and Facility Outline for the Kaminoseki Nuclear Power Station

Overall power station arrangement plan

Overall power station arrangement plan

Facility outline

  Kaminoseki Nuclear Power Station
Units 1 and 2 (planned)
Nuclear reactor Model Improved boiling water reactor (ABWR)
Thermal output 39.26 million kW
Pressure, temperature Approximately 72 atm, 287°C (at outlet)
Fuel Type Low-enrichment uranium
Number of fuel assemblies 872
Containment vessel Type Pressure suppression system
Turbine Type Tandem-compound 6-flow exhaust condensing type (reheating type)
Output 1.373 million kW
Rotation speed 1,800 rpm
Steam flow Approximately 7,300 tons/hour
Generator Type Quadrature-axis cylindrical revolving-fiel
Three-phase synchronous
Capacity 1.53 million kVA

Biodiversity and Environmental Preservation at the Kaminoseki Nuclear Power Station

This pamphlet introduces our efforts for the preservation of biodiversity during the construction and operation of the Kaminoseki Nuclear Power Station.

Some of the details of these efforts are described below.

Terrestrial Environmental Preservation Measures

When locating a new power station, we strive to keep the area of land alteration and the amount of tree trimming and cutting to the necessary miniumum. In addition to working to preserve existing flora as much as possible, we perform afforestation as appropriate to the affected area.
Terrestrial Environmental Preservation Measures
Click to enlarge.

Environmental Preservation Measures for Terrestrial Life

In order to reduce the impact on the natural habitats of terrestrial life, the area of altered land and the range of tree trimming and cutting will be kept to the required minimum, as we make every effort to preserve the existing plant life. In addition, we will introduce plant life that matches the feeding patterns of local birds.
Further, before starting tree trimming and cutting work in the region to be altered, we will check for the presence of precious fauna and flora species. If any are discovered, they will be moved or transplanted to similar environments outside of the region to be altered.

Precious Fauna Flora Species that have been Relocated So Far

Environmental Preservation Measures in Nearby Marine Areas

This power station will be arranged so that the area for land reclamation can be limited to the required minimum of approximately 140,000 m2. Further, we will make every effort to preserve marine areas through the use of a “deep-water intake method/underwater discharge system” (which reduces the area in which thermal effluent is discharged) as a method for the intake and discharge of cooling water, and keep the volume of sodium hypochlorite injected into the intake to the required minimum.
Estimated Range of Thermal Effluent Dispersal (Surface)

Environmental Preservation Measures for Marine Life

Shellfish (family cornirostridae)
(This species has high academic value for research in the process of shellfish evolution.)

This species is an extremely small shellfish of only a few millimeters that is said to show the process of evolution in shellfish. It makes its home on the undersides of rocks in tide pools.

* This species has been discovered throughout a wide area from Iyonada to Suounada through surveys performed by Chugoku Electric Power.

Conceptual drawing of area around tide pool
Preservation Measures
  • Sites (and nearby tide pools) originally designated reclamation, but that are now confirmed habitats for shellfish, will be preserved.
  • During construction, barriers to prevent the dispersal of contaminants will be installed in front of tide pools.
  • Natural rock barriers will be built in front of preserved tide pools to reduce waves and allow the flow of water.
  • Follow-up surveys will be performed at preserved tide pools.
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