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

Takefumi Minakawa; Masaaki Ikeda; Naoshi Hirai; Yoshimichi Ohki

doi:10.1109/CEIDP.2018.8544872

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

Takefumi Minakawa, Masaaki Ikeda, Naoshi Hirai, Yoshimichi Ohki

Kagami Memorial Research Institute for Materials Science and Technology

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

2 Citations (Scopus)

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.

Original language	English
Title of host publication	2018 IEEE CEIDP Conference on Electrical Insulation and Dielectric Phenomena, CEIDP 2018
Publisher	Institute of Electrical and Electronics Engineers Inc.
Pages	602-605
Number of pages	4
Volume	2018-October
ISBN (Electronic)	9781538661925
DOIs	https://doi.org/10.1109/CEIDP.2018.8544872
Publication status	Published - 2018 Nov 26
Event	2018 IEEE CEIDP Conference on Electrical Insulation and Dielectric Phenomena, CEIDP 2018 - Cancun, Mexico Duration: 2018 Oct 21 → 2018 Oct 24

Other

Other	2018 IEEE CEIDP Conference on Electrical Insulation and Dielectric Phenomena, CEIDP 2018
Country	Mexico
City	Cancun
Period	18/10/21 → 18/10/24

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Electrical and Electronic Engineering

Access to Document

10.1109/CEIDP.2018.8544872

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Cite this

Minakawa, T., Ikeda, M., Hirai, N., & Ohki, Y. (2018). Aging State Analysis of Safety-related Cables for Nuclear Power Plants Exposed to Simulated Accident Conditions. In 2018 IEEE CEIDP Conference on Electrical Insulation and Dielectric Phenomena, CEIDP 2018 (Vol. 2018-October, pp. 602-605). [8544872] Institute of Electrical and Electronics Engineers Inc.. https://doi.org/10.1109/CEIDP.2018.8544872

Aging State Analysis of Safety-related Cables for Nuclear Power Plants Exposed to Simulated Accident Conditions. / Minakawa, Takefumi; Ikeda, Masaaki; Hirai, Naoshi ; Ohki, Yoshimichi.

2018 IEEE CEIDP Conference on Electrical Insulation and Dielectric Phenomena, CEIDP 2018. Vol. 2018-October Institute of Electrical and Electronics Engineers Inc., 2018. p. 602-605 8544872.

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

Minakawa, T, Ikeda, M, Hirai, N & Ohki, Y 2018, Aging State Analysis of Safety-related Cables for Nuclear Power Plants Exposed to Simulated Accident Conditions. in 2018 IEEE CEIDP Conference on Electrical Insulation and Dielectric Phenomena, CEIDP 2018. vol. 2018-October, 8544872, Institute of Electrical and Electronics Engineers Inc., pp. 602-605, 2018 IEEE CEIDP Conference on Electrical Insulation and Dielectric Phenomena, CEIDP 2018, Cancun, Mexico, 18/10/21. https://doi.org/10.1109/CEIDP.2018.8544872

Minakawa T, Ikeda M, Hirai N , Ohki Y. Aging State Analysis of Safety-related Cables for Nuclear Power Plants Exposed to Simulated Accident Conditions. In 2018 IEEE CEIDP Conference on Electrical Insulation and Dielectric Phenomena, CEIDP 2018. Vol. 2018-October. Institute of Electrical and Electronics Engineers Inc. 2018. p. 602-605. 8544872 https://doi.org/10.1109/CEIDP.2018.8544872

Minakawa, Takefumi ; Ikeda, Masaaki ; Hirai, Naoshi ; Ohki, Yoshimichi. / Aging State Analysis of Safety-related Cables for Nuclear Power Plants Exposed to Simulated Accident Conditions. 2018 IEEE CEIDP Conference on Electrical Insulation and Dielectric Phenomena, CEIDP 2018. Vol. 2018-October Institute of Electrical and Electronics Engineers Inc., 2018. pp. 602-605

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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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AB - 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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