Sealed cable entry devices passing through the outer and inner walls of the containment vessel of a nuclear power plant

Abstract

The invention relates to the field of electrical engineering, in particular to a device for introducing circuit sealing into the sealing area of ​​a nuclear power plant's multi-layer containment shell. The device may be used in penetrations through internal and external walls that are susceptible to displacement relative to each other by earthquakes or thermal expansion of the walls and penetrations. The object of the present invention is to improve the reliability of sealed cable entries using difficult-to-bend high voltage wires. In order to achieve the proposed purpose, there is provided a sealed cable entry device passing through the outer wall and inner wall of the containment vessel of a nuclear power plant, which includes an embedded sleeve (3) arranged in the inner wall (1), said sleeve The entry portion (44) of the cable (2) is fixed rigidly inside. A device for compensating relative movement between the cable (2) and the outer wall (11) is installed on the outer wall (11) along the axis of the bushing (3). The compensating device has a pipe (19) with a bellows (24) on the outer end (20) of the pipe and on the other end (21) of the pipe on the inner surface (18) of the outer wall (11). A second similar bellows (25) is mounted symmetrically. The active ends (30) and (31) of the bellows (24) and (25) are set in a conical shape, and their inner surfaces (28) and (29) are supports for the outlet portion (46) of the cable (2), said The outlet portion (46) of the cable (2) is freely disposed within the duct (19) with a gap (47) relative to the inner surface (49) of the duct (19). The gap 47 between the sheath (48) of the outer surface of the cable (2) and the inner surface (49) of the pipe (19) is selected according to design calculations. The gap (47) should not be less than the maximum orthogonal thermal-seismic displacement amplitude in one plane of the inner wall (1) relative to the outer wall (11) and the change in coaxial position of the cable (2) in the duct (19).

Description

technical field [0001] The present invention relates to the field of electrical engineering, and in particular to a device for introducing circuit sealing into the sealing area of ​​a nuclear power plant's multi-layer containment vessel, which can be opposed to each other when passing through, which is easily affected by earthquakes or thermal expansion of walls and penetrations Used in penetrations of displaced interior and exterior walls. Background technique [0002] A sealed power entry through the reinforced concrete walls of the containment vessel of a nuclear power plant is known, which consists of a sleeve with a biological shield and electrical leads inside (cf. USSR Invention Certificate No. 1551142 of 14.04.1988, State Classification No.: H01B 17 / 26). [0003] The sealed cable entry can only lead electrical conductors into the containment vessel of a nuclear power plant having a reinforced concrete wall. In order to improve the safety of nuclear power plant oper...

AI Technical Summary

Problems solved by technology

When using stiffer wires with larger diameters that cannot be bent in the spanning region between the inner and outer walls of the containment when one end is displaced relative to the other, the wire exit in the compensator will experience a torsional moment and squeeze. Press the supporting element at the outlet of the conductor in the pipe, as a result, damage to the insulation sheath

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