A nuclear facility stainless steel cladding structure and construction technology

Abstract

The invention relates to a stainless steel cladding structure for nuclear facilities. The stainless steel cladding structure comprises a bottom layer (4) and a stainless steel surface layer (1) arranged above the bottom layer (4), between the bottom layer (4) and the stainless steel surface layer (1) An interlayer support (3) connected to the bottom layer (4) and an interlayer connector (2) connected to the bottom layer (4) and the stainless steel surface layer (1) are provided; the stainless steel cladding structure is made of concrete (10) It is the foundation and the bottom layer (4) is rooted and anchored in contact with the concrete (10). The invention also provides the construction technology of the stainless steel cladding structure of the nuclear facility. The stainless steel cladding structure of nuclear facilities provided by the present invention is a double-layer structure composed of the bottom layer and the stainless steel surface layer, which can form drainage channels and maintenance channels, which is convenient for in-service monitoring, inspection and maintenance of the stainless steel cladding structure, and can ensure that the stainless steel The installation cleanliness of the surface layer can avoid stress corrosion of the stainless steel surface layer, simplify the construction conditions and shorten the construction period.

Description

technical field [0001] The invention belongs to the technical field of nuclear facility structure design, and in particular relates to a nuclear facility stainless steel cladding structure and construction technology. Background technique [0002] The 304L single-layer stainless steel cladding structure is often used in the fuel storage and transfer building structures of nuclear facilities. The main construction techniques include: 1) Installing the anchoring-splicing embedded parts of the stainless steel cladding structure on the primary concrete; 2) Secondary concrete construction , including opening drainage grooves; 3) Paint the secondary concrete surface (including concrete drying, concrete surface treatment, painting, etc.); 4) Install and weld a single-layer stainless steel cladding structure on the embedded parts. The disadvantages of the stainless steel cladding structure obtained by the above construction process are: a. It is difficult to ensure the cleanliness o...

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Problems solved by technology

The disadvantages of the stainless steel cladding structure obtained by the above construction process are: a. It is difficult to ensure the cleanliness of the side of the stainless steel cladding structure and the concrete in the secondary concrete construction and painting, which often leads to the failure of the welding seam radiographic inspection when the stainless steel cladding is installed. ; b. Secondary concrete construction needs to strictly control chloride ions and halogen elements to avoid possible stress corrosion of the stainless steel cladding, which will lead to increased construction costs, but due to reasons such as management and extensive construction, chloride ions and halogen elements are not strictly controlled. Corrosion and leakage of the stainless steel cladding of nuclear facilities also occurs from time to time after the nuclear facility has been in operation for several years or more than ten years, resulting in additional outages for maintenance, which often lead to large economic losses; c. When painting the secondary concrete surface , in order to ensure the quality of the paint film, high requirements are placed on the surface of the concrete such as the degree of dryness, which leads to a longer construction period, and the quality and life of the paint film are affected by factors such as paint varieties and construction operations, and are often not easy to maintain for a long time. It is almost the same as nuclear facilities. The ten-year lifespan varies greatly

[0003] In addition, the existing single-layer stainless steel cladding structure, especially the stainless steel cladding of the pool used to store spent fuel, in the event of corrosion leakage, if the spent fuel and the storage grid are not removed, it is difficult to locate the leak location and check due to space constraints. repair

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