Special silicone sealant and sealing structure for nuclear power plant integral structure

Abstract

The invention relates to a special silicone sealant for a nuclear power plant integral structure. The special silicone sealant comprises the following components in parts by mass: 100 parts of 50000cs hydroxyl silicone oil, 5-10 parts of dimethyl silicone oil, 1-5 parts of a KH550 coupling agent, 1-5 parts of a KH560 coupling agent, 10-35 parts of flame retardant powder, 10-20 parts of heavy aluminum oxide, 15-30 parts of an inorganic filler, 1-5 parts of phenyltrissilane, 5-10 parts of dimethyl dibutanoneoximido silane and 0.5-1.5 parts of an organic tin catalyst. A nuclear power plant internal sealing structure comprises a CV steel plate and a concrete wall, and further comprises silicone sealant, wherein a pit is formed in a joint of the concrete wall and the CV steel plate; the silicone sealant is arranged in the pit. The special silicone sealant has the beneficial effects that after being subjected to 60-year accumulated irradiation dose of the nuclear power plant and a LOCA test, the special silicone sealant is free of pulverization and degradation, has good adhesive property and flexibility; during the process of stimulating the 66psig (455kPa) pressure intensity inside the CV, lin (25.4mm) relative displacement is generated between the CV and the concrete, so that good watertight and gastight performances are ensured.

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 ...

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Problems solved by technology

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

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