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Pressurized Water Reactor (PWR):History [ ENERGY ]

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History

MHI Group completed the first Pressurized Water Reactor (PWR) nuclear power plant in Japan, Mihama Unit 1, in 1970.

Since then, we have made continuous technological advancements to improve PWR power plants. Today, we are proud to be able to deliver nuclear power plants, which are world-class in all aspects of reliability, safety, operability, and radiation exposure reduction. We will continue to develop our technologies further to improve the economic efficiency and operability of PWR plants.

HISTORY OF MITSUBISHI PWR PLANT

HISTORY OF MITSUBISHI PWR PLANT

1970 Mihama-1
  • Commence commercial operation on November 28 1970
  • 1st PWR in Japan(2-loop plant)
  • Pressurizer manufactured domestically
  • Turbine / generator manufactured domestically(with steam reheating system)
1972 Mihama-2
  • Commence commercial operation on July 25 1972
  • 1st PWR supplied by Mitsubishi as a main contractor
  • Steam generator manufactured domestically
  • Reactor vessel manufactured domestically
1974 Takahama-1
  • Commence commercial operation on November 14 1974
  • 1st 3-loop plant in Japan
  • Turbine EH Governor
  • Feed water treatment changed to AVT(All Volatile Treatment with hydrazine)
1975 Genkai-1
  • Commence commercial operation on October 15 1975
  • Core Internals manufactured domestically
  • Control Rod Drive Mechanism manufactured domestically
Takahama-2
  • Commence commercial operation on November 14 1975
1976 Genkai-1
  • High-purity feed water treatment by Condensate Demineralizer
Mihama-3
  • Commence commercial operation on December 1 1976
  • Pre-fabricated piping systems
1977 Ikata-1
  • Commence commercial operation on September 3 1977
  • 44-inch high-efficiency turbine blades
1979 Ohi-1
  • Commence commercial operation on March 27 1979
  • 1st 4-loop PWR in Japan
  • 17×17 fuel assemblies
  • Two-stage reheat turbine system
  • Ice condenser type reactor containment
  • Water-cooled generator stator coils
Ohi-2
  • Commence commercial operation on December 5 1979
1981 Genkai-2
  • Commence commercial operation on March 30 1981
  • Reactor coolant pump manufactured domestically
  • Up-flow design of core internals
1982 Ikata-2
  • Commence commercial operation on March 19 1982
1984 Sendai-1
  • Commence commercial operation on July 4 1984
  • 1st application of MITI improvement/standardization program
  • Titanium tube condenser
  • Integrated reactor vessel head
  • Super-size moisture separator reheater
1985 Takahama-3
  • Commence commercial operation on January 17 1985
  • Advanced reactor coolant pump
  • Thick-steel-plate reactor containment
  • Mono-block low-pressure turbine rotor
  • Compatible with house load operation
Takahama-4
  • Commence commercial operation on June 5 1985
Sendai-2
  • Commence commercial operation on November 28 1985
1987 Tsuruga-2
  • Commence commercial operation on February 17 1987
  • PCCV(pre-stressed concrete containment vessel)
  • Forged ring reactor vessel core region
1989 Tomari-1
  • Commence commercial operation on June 22 1989
  • 1st Japanese PWR for 50Hz service
  • Domestic supply of reactor coolant pumps for 50Hz service
1991 Tomari-2
  • Commence commercial operation on April 12 1991
  • Digital control system
  • Advanced control board
  • Generator load-break switch
Ohi-3
  • Commence commercial operation on December 18 1991
1993 Ohi-4
  • Commence commercial operation on February 2 1993
1994 Genkai-3
  • Commence commercial operation on March 18 1994
Ikata-3
  • Commence commercial operation on December 15 1994
  • 52-inch low pressure turbine blades
1997 Genkai-4
  • Commence commercial operation on July 25 1997
2009 Tomari-3
  • Commence commercial operation on December 22 2009
  • 54-inch low pressure turbine blades
  • Advanced control board design
  • Completely digitalized control/protection system

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