Method for evaluating service life of polyolefin cable insulation material for nuclear power station

Abstract

The invention provides a method for evaluating the service life of the polyolefin cable insulation material for a nuclear power station. The method comprises the following steps: firstly, carrying outirradiation crosslinking and then carrying out plate vulcanization treatment simulation to obtain a cable insulation sample for the nuclear power station. Carrying out accelerated thermo-oxidative aging treatment on the obtained sample at different temperatures for different times, and simulating a cable aging process; Meanwhile, mechanical properties, insulating properties and infrared microcosmic parameters are obtained, and the aging state is represented. According to an elongation at break method, obtaining corresponding aging end point time tau1 at different temperatures T1. And carryingout DSC non-isothermal oxidation induction test on the obtained sample by adopting different heating rates, and calculating the activation energy of the cable insulation sample by adopting a Kissigerequation. And deducing a linear equation between the service life tau2 of the cable insulation sample to be tested and the reciprocal of the absolute temperature of accelerated aging by combining anArrhenius equation. The technical problems that an existing single-factor elongation at break method for evaluating the service life of the cable is short and not accurate enough are solved.

Description

technical field [0001] The invention relates to the technical field of diagnosis of insulating materials used in nuclear power plants, in particular to a method for evaluating the service life of polyolefin cable insulating materials used in nuclear power plants. Background technique [0002] Nuclear-grade cables are cables for 1E-level circuits in nuclear power plants. According to the French nuclear power standard "Rules for Design and Construction of Pressurized Water Reactor Nuclear Island Machinery" (RCC-E for short), polyolefin cable insulation materials for nuclear power plants can be classified into K1 categories. , K2 and K3 categories. K1 type cables are installed in the containment, which requires that the equipment and systems of the nuclear power plant can operate normally under normal operating conditions, accident conditions and sudden earthquake loads. K2 cables are used in the containment, and must ensure the normal operation of facilities and systems in th...

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Problems solved by technology

[0005] The purpose of the present invention is to provide a method for evaluating the life of polyolefin cable insulation materials used in nuclear power plants, a...

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