Aging State Analysis of Safety-related Cables for Nuclear Power Plants Exposed to Simulated Accident Conditions

2018 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP) Pub Date : 2018-10-01 DOI:10.1109/CEIDP.2018.8544872

T. Minakawa, M. Ikeda, N. Hirai, Y. Ohki

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引用次数: 6

Abstract

Several cables in safety-related systems in nuclear power plants are required to maintain their intended electrical insulating function while they are exposed to harsh environmental conditions in the primary containment vessel during assumed accidents. This must be satisfied even after the cables are operated for their full service period. For such cables, the behavior of their insulation under accidents is a matter of concern. In this research, after silicone rubber insulated cables were pre-aged by simultaneous thermal and radiation exposure, they were irradiated or exposed to high temperature steam to simulate the environmental conditions during the accident, or subjected to the combination of these conditions. The resultant changes in various properties were analyzed by instrumental analyses. As a result, it has been confirmed that the pre-aging and radiation exposure induce cross-linking and depolymerization of siloxane chains to produce cyclic siloxanes, whereas the steam exposure causes significant depolymerization and the generation of low-molecular cyclic siloxanes.

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核电厂安全相关电缆在模拟事故条件下的老化状态分析

核电站安全相关系统中的几条电缆在假定发生事故时暴露在主安全壳中的恶劣环境条件下，需要保持其预期的电气绝缘功能。即使电缆在其全部服务期内运行，也必须满足这一要求。对于这类电缆，其绝缘在事故下的性能是一个值得关注的问题。在本研究中，硅橡胶绝缘电缆在经过热辐射同时暴露预老化后，将其辐照或暴露于高温蒸汽中模拟事故发生时的环境条件，或进行这些条件的组合。通过仪器分析分析了各种性质的变化。结果表明，预老化和辐射暴露诱导硅氧烷链交联解聚生成环硅氧烷，而蒸汽暴露则引起明显的解聚并生成低分子环硅氧烷。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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2018 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP)

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