A flat ceramic membrane has a separating function and is a novel type of material membrane. High temperature resistance, superior mechanical strength, huge permeation flow, and reusability are all advantages. It’s been employed in water treatment industries like food, medicine, and fine chemicals with great success. However, there has been no mention of application research in nuclear power plants so far. This paper evaluates the feasibility of ceramic membranes in a primary coolant water environment in terms of filtration materials and fluid compatibility. The researchers tested the chemical stability of the flat ceramic membranes and observed the variation of dissolved elements concentration with time, mass and temperature. The dissolved elements are mostly Al, Si, Mg, and Ti, according to the results. The leachable Si element is the most abundant, followed by Al and Mg, with a very low eluted Ti percentage. With increasing duration, mass, and temperature, the dissolved elements of the flat ceramic membrane in the simulated primary coolant water environment rise. With time, the rate of dissolved element release diminishes. The dissolving rate tends to a constant value until a particular concentration (about 10 mg/L in this experiment) is reached. The existing flat ceramic membrane is not suited for the primary coolant water environment of PWR nuclear power plants due to the high dissolving rate of each element.
The tensile strength of nuclear graphite is an important parameter in evaluating and calculating the structural strength of High Temperature Reactor-Pebbled Modules (HTR-PM). The tensile strength of nuclear graphite with varied sizes and surface roughness was tested, and the size effect tensile strength formula was created. The results reveal that when the size of nuclear graphite increases, its tensile strength falls. However, in the 4 mm to 8 mm range, the size impact is less noticeable. The Weibull modulus m0.95 value is calculated based on the experimental data, and the size effect formula is established. The difference between the estimated value and the experimental value computed using the size effect formula is less than 10%. Tensile strength may be calculated using the size effect formula for nuclear graphite specimens of various sizes. The impact of surface roughness on tensile strength is linked to the grinding direction and specimen size. After a certain level of surface roughness, the tensile strength diminishes when the surface scratches are perpendicular to the tensile force. The stronger the effect, the smaller the specimen size. When surface scratches are parallel to the tensile tension, the tensile strength does not vary much as the surface roughness increases.
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