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

A cable insulation and life evaluation technology, applied in the direction of analyzing materials, using stable tension/pressure to test material strength, measuring resistance/reactance/impedance, etc., can solve problems such as inaccuracy and short cable life

Active Publication Date: 2020-06-26
CGN DELTA TAICANG TESTING TECH CO LTD +1
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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, and its purpose is to solve the technical problem that the existing single-factor elongation at break method for evaluating cable life is too short and not accurate enough

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

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Embodiment

[0040] A method for evaluating the life of a polyolefin cable insulation material for a nuclear power plant, comprising the following steps:

[0041] Step 1. The polyolefin cable insulation material is subjected to radiation crosslinking and then plate vulcanization simulation to obtain cable insulation samples for nuclear power plants.

[0042] Step 2. The cable insulation sample obtained in step 1 is subjected to thermal oxygen aging treatment for 48h, 96h, 168h, 336h, 504h, 672h, and 840h at four temperature points of 135°C, 150°C, 165°C, and 180°C, respectively. Simulate the cable aging process. And take the elongation at break as the ordinate, and the aging time as the abscissa, draw the relationship diagram of mechanical properties and aging time (see attached figure 1 ).

[0043] At the same time, the mechanical properties, insulation properties, and infrared microscopic parameters of the cable insulation samples at different temperatures and aging times are obtained, a...

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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...

Claims

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Application Information

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IPC IPC(8): G01N17/00G01N3/08G01N21/3563G01R27/02G01R27/26G01R31/12
CPCG01N17/00G01N3/08G01R31/1272G01N21/3563G01R27/2694G01R27/02
Inventor 曹丹李建喜费楚然刘鹏
Owner CGN DELTA TAICANG TESTING TECH CO LTD
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