KEPCO E&C is preparing to take a new leap forward in the Gimcheon new office building.

APR+

APR+ picture

APR+ was developed in accordance with ‘Nu-Tech 2012’, which was established to overcome the restriction requirements in independent exportations through the complete self-reliance of some core technology, which had been dependent on foreign technology. APR+ was developed with pure domestic technology, so it is a 100% native nuclear power plant, which has no obstacle for exportation. APR+ has secured the last dependent core technology in APR1400 such as Reactor Coolant Pump (RCP), Man-Machine Interface System (MMIS), and Safety and Performance Analysis Code (SPACE).

APR+ was designed so that even during the power needed for cooling the reactor is cut off when the reactor is suddenly stopped, the coolant would still be provided for maximum of 3 days. Furthermore, the frequency of serious accidents such as melting of reactor core is under once per 100,000 years for the existing nuclear power plants, but APR+ is designed so that it would be under once per 1 million years. On top of that, to protect the safety functions of the nuclear control system from cyber attacks, the basic requirements of design for the cyber security of APR+ was set based on the domestic regulatory policies. Also, the major facilities such as the Main Control Room, which corresponds to the brain of the power plant, and Remote Shutdown Room was designed to be perfectly protected from huge scale external shocks such as airplane crashes. In the APR+, 16 nuclear fuel rods were added compared to APR1400, and the diameter of nuclear reactor has gotten 30㎝ bigger. Like this, APR+ has gotten bigger in the power size, but the efficiency had gotten even higher.

KEPCO E&C has put in a lot of effort into technological development in SC Structure and Complex Modules, which are the core technology for duration reduction. Consequently, construction period has been reduced 1 year compared to that of APR1400. Moreover, the electricity generation can be reduced flexibly like a thermal power plant, so it can respond flexibly to the power demands, which constantly change.

APR+, in accordance with the 7th Basic Plan for Long-term Electricity Supply and Demand of Korea, has been first applied in designing Cheonji Units 1 & 2 and will be completed in 2028 and 2029, respectively.

Major Design Characteristics

Advanced Power Reactor Plus
Features
  • TypePressurized Water Reactor
  • Capacity1,500MW class (4,308MWt)
  • Design Lifetime60 Years
  • Seismic DesignSSE 0.3g
Performance
  • AvailabilityAverage of 94% or Higher
  • Unplanned Trip0.6 Time/Year or Less
  • Refueling Interval18 Months or Higher
  • Load Rejection CapabilityMaintain House Load in Complete Load Rejection
Safety
  • Core Damage Frequency10-6/RY
  • Containment Failure Frequency10-7/RY or Less
  • Occupational Radiation Exposure Dose1man-Sv/RY or Less
  • Thermal Margin10% or Higher
  • Station Blackout Coping Time8 Hours Minimum
  • Containment BuildingPS Concrete Structure

Design and Operation Data

  • Nuclear Steam Supply System
    Number of Coolant Loops
    2
    Primary Circuit Volume, including Pressurizer
    493.1㎥
    Steam Flow Rate at Normal Conditions
    8,770,000㎏/hr
  • Reactor Coolant System
    Primary Coolant System Flow Rate
    78.0 x 10 kg/hr
    Operating Pressure
    158.2㎏/㎠
    Coolant Inlet Temperature at RV Inlet
    291.7℃
    Coolant outlet Temperature at RV Outlet
    326.1℃
  • Reactor Core
    Active Core Height
    381㎝
    Equivalent Core Diameter
    366.7㎝
    Average Linear Heat Rate
    118.56㎾/m
    Number of Fuel Assemblies
    257
    Number of Control Element Assemblies
    18 months
    Operating Cycle Length(Full Cycle Length)
    109
  • Reactor Pressure Vessel
    Cylindrical Shell Inner Diameter
    490.86cm
    Wall Thickness of Cylindrical Shell
    25.30cm minimum
    Total Height
    1,476cm
  • Steam Generator
    Type
    Vertical U-Tube with Integral Economizer
    Heat Transfer Surface Area
    15,683 6㎡
    Primary/Secondary Operating Pressure
    158.2/71.7㎏/㎠
    Maximum Moisture Content at SG
    0.25% or Less
  • Reactor Coolant Pump
    Type
    Single Stage, Centrifugal, Vertical
    Rated Flow Rate
    476.6㎥/min
    Rated Pump Head
    119m
    Pump Speed
    1,190rpm
  • Pressurizer
    Total Volume
    80.7㎥
    Steam Volume (Full Power)
    40.9㎥
    Design Temperature / Pressure
    371℃/175.8㎏/㎠
    Heating Power of the Heater Rods
    3,000㎾
  • Containment Building
    Type
    Prestressed Cylindrical Concrete with Steel Liner
    Inside Diameter
    46.63m
    Height
    77.19m
    Normal Operating Temperature
    10~48.9℃
  • Turbine
    Type
    1HP-3LP Tandem-Compound, Reheat & Regeneration
    Speed
    1,800rrpm
  • Generator
    Type
    Synchronous, 4 Poles
    Voltage
    27㎸, 3 Phases
    Frequency
    60㎐