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2022-08-12
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Korean scientists use 3D printing to manufacture nuclear safety valves

as we all know, nuclear energy is a cleaner energy, which can help countries stay away from air pollution and other problems caused by fossil fuels (oil, coal, etc.). However, the disaster caused by the problems of nuclear power plants is also shocking, so the safety maintenance and repair of nuclear power plants is very important. In order to equip nuclear power plants with

as we all know, nuclear energy is a cleaner energy, which can help countries stay away from air pollution and other problems caused by fossil fuels (oil, coal, etc.). However, the disaster caused by the problems of nuclear power plants is also shocking, so the safety maintenance and repair of nuclear power plants is very important. In order to equip the nuclear power plant with more sufficient spare parts production sources, scientists at the Korean Institute of atomic energy (KAERI) have 3D printed a large safety valve with sufficient resistance characteristics, so that it can be used in nuclear reactors

3d printed nuclear safety valve

take the United States as an example. Since 2007, the United States has put into operation, for example, 2351 excess investors have paid additional "packaging waste management assistance" 24 reactors. In order to ensure that these plants continue to operate safely and avoid the recurrence of past disasters, please maintain and repair them frequently. However, the KAERI team found a shortage of some safety critical components, such as chemical and volume control system (CVCs) valves used to reduce core pressure

specifically, CVCs is used to perform fluid supply or flow tasks in the reactor, and although it can be deployed elsewhere, safety class valves must always meet certain standards. For example, nuclear components must pass water pressure, operation and flow tests before deployment, and it has previously proved difficult to create sufficiently resilient components on demand

valve equipment is composed of three independent parts

it can be used in the stretching of various metal materials, steel cables, chains, lifting belts, commonly used metal products, building structures, ships, ordnance and other fields. According to KAERI scientists, metal 3D printing alone is not enough to replace traditional production to manufacture nuclear spare parts. However, by combining directional energy deposition (DED) technology with 5-axis CNC processing, the team found that they were able to produce replicas with the required high accuracy

the researchers' chromium and nickel based valves have 3D printed body, bonnet and cage. After assembly, the 300mm device was strictly evaluated. During the pressure test, it was found that the layer boundary of the equipment acted as the focus of residual stress, and the strength was reduced by% from 2. Trial production

similarly, when CVCs is post processed in a 1100 ℃ hot isostatic press (hip), its integrity is reduced by 33%, which is 18% higher than that of traditional valves. However, in terms of stable performance and its "fatigue limit", the tensile strength of the equipment made of this additive is 202.6 MPa, which is better than that of commercial products

in general, the research team concluded that despite the reaction to heat treatment, the constant strength of its additional valve was sufficient for its final use. Considering that the CECS of this group duplicates the components of category 1, the nuclear regulatory agency of the International Atomic Energy Agency will classify them as "the parts whose failure will lead to high severity consequences". The strength of 3D printing components has indeed been highly praised

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