A special silicone sealant for internal structure of nuclear power plant and its sealing structure

Abstract

The invention relates to a special silicone sealant for the internal structure of a nuclear power plant, which comprises the following components in mass-number ratio: 100 parts of 50000cs hydroxyl silicone oil; 5-10 parts of dimethyl silicone oil; 1-5 parts of KH550 coupling agent ; 1-5 parts of KH560 coupling agent; 10-35 parts of flame retardant powder; 10-20 parts of heavy alumina; 15-30 parts of inorganic filler; 5-10 parts of dibutylketoxime silane; 0.5-1.5 parts of organotin catalyst. An internal sealing structure of a nuclear power plant includes a CV steel plate and a concrete wall, and silicone sealant. A depression is provided at the joint between the concrete wall and the CV steel plate, and the silicone sealant is provided in the depression. The beneficial effect of the present invention is: after the cumulative radiation dose and LOCA test of the 60-year lifetime of the nuclear power plant, there is no pulverization and degradation, and still has good bonding performance and flexibility; the pressure of 66psig (455kPa) inside the simulated CV Under this condition, a relative displacement of lin (25.4mm) occurs between the CV and the concrete, which can ensure good watertight and airtight performance.

Description

technical field [0001] The invention relates to the field of nuclear power, in particular to a special silicone sealant for the internal structure of a nuclear power plant and its sealing structure. Background technique [0002] The inside and outside of the containment building (CV) of a nuclear power plant are in contact with concrete at different elevations. In order to prevent moisture from penetrating into the surface in contact with the steel plate and concrete, thereby causing corrosion on the CV surface, it is necessary to set corresponding seals at these joints. Also in order to prevent moisture from entering the gap between the steel plate and concrete in other types of steel plate concrete structures (such as CA modules), causing corrosion of the steel panels, it is also necessary to set seals at these parts. [0003] In addition to meeting the environmental conditions under normal operating conditions, the sealing material inside the CV also needs to ensure that ...

AI Technical Summary

Problems solved by technology

However, in the prior art, there is no sealant that can meet all the above requirements.

Images