Doosan Heavy Industries & Construction owns core technologies and ongoing performance with the three core components of the power generation business - boilers, turbines and generators. Doosan is also making substantial inroads into the eco-friendly power generation business including wind power, ESS (Energy Storage System) and microgrid.
Doosan Heavy Industries & Construction is writing the history of nuclear power development in Korea.
We have supplied the major equipment to numerous nuclear power plants in Korea (23 in total), beginning with Hanbit nuclear power plants units 1 and 2. We have also supplied main equipment for total 12 units of the OPR1000, beginning with Hanbit nuclear power plants units 3 and 4, by participating in the development of the first domestic model, OPR1000. Furthermore, we have successfully localized the nuclear power plant by developing a design/manufacturing technology for Reactor Coolant Pumps (RCP) and Instrumentation and Control (I&C) System in 2012, and beginning with Shin Hanul nuclear power plant units 1 and 2, we completely localized the entire equipment of APR1400, which is the next generation of the OPR1000, from design to manufacturing.
Doosan Heavy Industries & Construction is now taking the lead in exporting to the global nuclear power plant market based on its outstanding technological accomplishment.
We have been recognized globally for its technology and quality after supplying the Replacement Steam Generator (RSG) for Sequoyah in the U.S., and the AP1000® Reactor Vessel (RV) and Steam Generator (SG) to China and U.S., beginning with the contract to supply steam generators for the Qinshan Phase III nuclear power plant units 1 and 2 in China in 1997. We participated in the Barakah nuclear power plant units 1,2,3 & 4, which were first exported with the APR1400, as a member of Team Korea in 2010. We have also earned recognition for its technological excellence among overseas customers by supplying all major equipment “on time and within budget”. The APR1400 is considered the most cost-effective nuclear power plant model. We plan to provide safe and reliable maintenance services by signing a Maintenance Service Agreement (MSA) for the Barakah nuclear power plants, based on its equipment supplying know-how.
Doosan Heavy Industries & Construction aims to be the best in the world while refusing to become complacent about its current success.
We are speeding up the development of technology related to spent fuel transportation and storage casks and nuclear facility decommissioning, and are expanding the scope of its participation to the service market at home and abroad. We have also announced strategic cooperation in supplying the main equipment for America’s first small modular reactor. Thus, we are constantly developing technology and diversifying its business areas in a bid to become a global leader in the nuclear power plant market, and actively supports local supplier recruitment and technology transfer in order to strengthen the nuclear power industry of any country that introduces a nuclear power plant.
Doosan Heavy Industries & Construction is Korea’s only major equipment supplier for nuclear power plants and boasts a high level of technology and manufacturing experience.
Nuclear reactor and internal structure
A nuclear reactor, a core element of a nuclear power plant, is designed for self-control and the maintenance of chain nuclear reactions, and makes use of heat energy from nuclear fission within the reactor. Doosan Heavy Industries & Construction provides reactor model APR1400, a 3rd-generation and Korean standard nuclear power plant, and the AP-1000 from Westinghouse to Korea, the U.S., the UAE, China and other countries.
A reactor vessel is designed to withstand high temperatures and high pressures in order to provide a space for containing nuclear fuel and chain reaction. It contains reactor internal components with a bottom head welded at the lower part of its cylindrical body.
The reactor vessel closure head assembly is a flanged hemispherical component bolted to the vessel by studs, nuts and washers to facilitate refueling and inspection.
The steam generator converts the secondary feedwater into the saturated steam and supplies it to the turbine system, using the primary coolant that is heated while circulating the reactor core. The heat-transfer tubes inside the steam generator form a pressure boundary between the primary system, which is the reactor coolant system, and the secondary system, which is the turbine/generator system.
Nuclear Reactor Coolant Pump
A nuclear reactor coolant pump is installed at the primary system of the nuclear power plant. The large capacity vertical pump is a key part of the nuclear steam supply system and delivers the heat generated by nuclear reaction to the steam generator by compulsively circulating the high-temperature and high-pressure coolant.
Control Element Drive Mechanism
The CEDM (control element drive mechanism) is an electric device that controls the level of nuclear reaction at the nuclear core, by withdrawing, inserting, stopping, and dropping the control rod in the vertical direction inside the nuclear reactor, according to the operating signal received from the CEDM control system.
The pressurizer acts as a surge tank that provides an expansion and contraction space for the reactor coolant during normal operation, and keeps the reactor coolant pressure constant using the spray nozzle at the top of the pressurizer and the heater at the bottom.
Integrated Head Assembly
Located at the top of a reactor, an integrated head assembly (IHA) lifts and transports both itself and the reactor vessel’s top cover simultaneously when reloading nuclear fuel, and cools the CEDM by forming a cooling air flow path to remove the heat generated by the CEDM
Nuclear Fuel Handling Equipment
Nuclear fuel handling equipment is used to transport and handle the nuclear fuel and the control element assembly in a nuclear power plant. It is composed of a nuclear refueling machine, spent fuel handling equipment, control element assembly change platform, fuel transfer equipment, a new fuel elevator, and control element assembly elevator. The equipment is operated under various control conditions set for the safe loading and removal of the nuclear fuel and the control element assembly.
Fuel Storage Rack
A fuel storage rack is a structure designed to store nuclear fuel used inside a power plant safely. It is composed of a new fuel storage rack and a spent fuel storage rack. The fuel storage rack keeps the temperature of nuclear fuel below a certain level by controlling the chain reaction of nuclear fuel and designing the coolant inflow, and protects nuclear fuel from external force such an earthquake.
Post-tensioning System of the Containment Building
The post-tensioning system of the containment building is a method of construction that applies internal stress to the nuclear reactor containment building in advance, in order to prevent the occurrence of tensile stress and deformation exceeding the allowable value for a concrete structure due to abnormal pressure inside the containment building. In this way, the post-tensioning system maintains the structural integrity of the reactor containment building under design basis accident conditions, such as loss of coolant.
A heat exchanger is a kind of pressure vessel that is used to transfer heat energy from a high-temperature fluid to a low-temperature fluid without allowing any direct contact between the two fluids. Doosan Heavy Industries & Construction designs, manufactures, and supplies various tubular heat exchangers – such as shutdown cooling heat exchangers, regenerative heat exchangers, and letdown heat exchangers – that are installed in nuclear power plants.
Pressure Vessels and Tanks
A pressure vessel is used to maintain and prevent the pressure of gas or fluid exceeding the atmospheric pressure inside the vessel. Doosan Heavy Industries & Construction designs, manufactures, and supplies various types of pressure vessels – such as safety injection tanks, volume control tanks, and reactor drain tanks – that are installed in nuclear power plants.
Instrumentation and Control (I&C) System
An instrumentation and control (I&C) system ensures the safe operation of a power plant and performs the function of preventing various types of accidents.
Supply of Total Nuclear Power Plant I&C Package
The Man-Machine Interface System (MMIS) corresponds to the brain and neural network of the nuclear power plant, and manages the operation, control, monitoring, instrumentation, and safety functions in an integrated manner in the event of an emergency. It is an instrumentation and control (I&C) system that ensures the safe operation of a nuclear power plant and prevents accidents as the fusion of digital and human engineering technology by using a state-of-the-art computer and controller. Doosan Heavy Industries & Construction has successfully localized the MMIS facility, which is a representative safety-critical field in which safety and reliability are the main priority, and has supplied it to Shin Hanul Units 1 and 2. The system will also be supplied to Shin Kori plant units 5 and 6, and worldwide marketing campaigns aimed at overseas nuclear power plants are also under way.
Doosan Heavy Industries & Construction is striving to provide the best technical services and solutions for operational nuclear power plants based on its engineering capabilities and equipment manufacturing experience.
Provision of Device for Replacement, and Construction Work
Doosan manufactures OPR-1000/APR1400 replacement equipment for Westinghouse and Framatome, and also supplies it to customers at home and in the U.S. and China, in order to prevent primary water stress corrosion cracking (PWSCC) of alloy 600 materials – which are widely applied to the control element drive mechanism (CEDM/CRDM) nozzle of the reactor vessel head and welding part, and the heat-transfer pipes of the steam generator – due to the long-term operation of a nuclear power plant.
Doosan designs, manufactures, and supplies high-density fuel racks which are used to store and transport spent fuel during operation; casks for storing and transporting spent nuclear fuel; feeders that are replaced when deteriorated due to long-term operation; studs, nuts and washers; gaskets; measurement instrument parts; and CPTS stands.
Replacement for Repair and Non-Destructive Testing
Doosan conducts design, construction work documentation, and on-site construction work for the replacement & repair work in the event of failure due to deterioration and breakdown during nuclear power plant operation. Doosan establishes the process of replacement & repair work according to the applied technical standards (ASME, KEPIC, etc.) required for on-site construction, and develops the procedure documents, quality control documents, qualification certification of welders, welding procedure specifications (WPS) and welding procedure qualification record (QPR) to conduct the replacement & repair work for the equipment in question.
Doosan conducts qualification and procedure qualification testing of non-destructive testers to run a non-destructive test of on-site construction work, which is required for replacement & repair work for the equipment in question. Doosan has secured the KPD (Korean Performance Demonstration) and Electric Power Research Institute (EPRI) Performance Demonstration (PD) to run a test, which are non-destructive test qualifications for the Control Element Drive Mechanism (CEDM/CRDM) and the Reactor Coolant System (RCS), for which special conditions are required concerning the qualification, procedure, and equipment verification of the non-destructive tester.
Engineering Technology Support
Doosan provides engineering services required for the operation and maintenance of nuclear power plants, based on its experience in the replacement, maintenance and performance improvement of the major equipment of nuclear power plants. As regards engineering services, Doosan conducts the Primary Water Stress Corrosion Cracking (PWSCC) evaluation of alloy 600, seismic performance assessment, stress data calculation, and tube plugging level upward of the steam generator heat-transfer pipe, by assessing the crack growth rate and welding residual stress.
Unlike nuclear power plants that are under construction, manual work cannot be performed at fully operational nuclear power plants due to interference when performing replacement & repair work and running a non-destructive test due to installed equipment, structures, piping, and radiation exposure. Therefore, replacement & repair work and non-destructive tests are carried out by developing the equipment and work procedures through technology development. Doosan is contributing to the integrity of fully operational nuclear power plants by developing and applying various proprietary technologies, such as a preventive maintenance technology for the nozzle of the Control Element Drive Mechanism (CEDM/CRDM); canopy seal repair and non-destructive testing technology; a half- nozzle repair technology; a remote thickness testing and repair technology for the containment building’s liner plate; anti-seismic gap overlay welding of the containment building and a non-destructive testing technology; a non-destructive testing technology of the sampling nozzle of the reactor cooling loop; a reactor lower head peening technology; a steam generator water chamber repair technology; and a heat-transfer extraction and welded-plugging technology for the steam generator.
Doosan supports Start-up Maintenance so that facilities and equipment are transferred to a power plant while maintaining its performance and integrity during its construction, carries out such services as facility maintenance and maintenance technology support so that Start-up Maintenance can be conducted smoothly by taking quick and safe measures against various types of equipment failure during the Start-up Maintenance period, including the major equipment of nuclear power plants, and performs the first fuel charge. Doosan also establishes a minor operation system in the early stages through the development of maintenance procedure documents and maintenance technology data, and its effective management, as a bridgehead for nuclear routine maintenance.
Upgrading the instrumentation and control system of operating nuclear power plants
Doosan Heavy Industries & Construction is striving to improve the safety of existing fully analog facilities at operating nuclear power plants by digitalizing their facilities to enable them to be operated more safely and efficiently, based on its rich providing experience in the nuclear power plant retrofits and upgrades business.
Spent fuel transportation and storage casks & nuclear power plant decommissioning
Doosan plans to increase its participation in the domestic and overseas markets by supplying products featuring an optimized design, based on its experience in producing spent fuel transportation and storage casks at home and abroad, and by accelerating the development of nuclear plant decommissioning technology.
Spent fuel transportation and storage casks
Spent fuel transportation and storage cask are used to prevent the nuclear fission (criticality) of spent fuel, and are designed to maintain their thermal and structural safety while containing radioactive materials and block radiation. Spent fuel should be stored in dry storage casks safely before the decommissioning of nuclear facilities. Doosan Heavy Industries & Construction has successfully developed various models of casks optimized for spent fuel transportation and storage in Korea based on its accumulated technology of manufacturing nuclear plant equipment, and plans to implement nuclear facility decommissioning and dry spent fuel storage projects in Korea.
Doosan Heavy Industries & Construction plays a significant role in driving the nation's economic development by supplying casting and forging products for industrial facilities, power generation facilities for nuclear and thermal plants, desalination plants as well as material handling systems to domestic and global plant markets.
Doosan Heavy Industries & Construction strives to become a company respected by communities through a blueprint that can enhance community competitiveness while establishing Doosan’s social contribution identity that instills pride in Doosan people.