Mechanism Elucidation of Degradation Dynamics of Ethylene Propylene Rubber Cable Insulations Sampled from Nuclear Power Containment using Additional Aging

被引：6
|
作者：
Fuse, N. [1 ]
Misaka, H. [1 ]
Homma, H. [1 ]
Okamoto, T. [1 ]
机构：
[1] Cent Res Inst Elect Power Ind, Elect Power Engn Res Lab, Yokosuka, Kanagawa 2400196, Japan
来源：
IEEE TRANSACTIONS ON DIELECTRICS AND ELECTRICAL INSULATION | 2016年 / 23卷 / 02期
关键词：
Boiling water reactor power plant; insulation in safety cables; ethylene propylene rubber; artificial additional aging; cross-linking; C-13; NMR; SEQUENCE DISTRIBUTION; PHOTOOXIDATION; POLYETHYLENE; COPOLYMERS; OXIDATION; LIFETIME;
D O I：
10.1109/TDEI.2015.005472
中图分类号：
TM [电工技术]; TN [电子技术、通信技术];
学科分类号：
0808 ; 0809 ;
摘要：
Ethylene propylene rubber insulation under operation for 16 years in boiling water reactor containments was subjected to additional thermal aging at 110 degrees C. After 70 days of aging, the mechanical property of the insulation was decreased such that the limit guaranteeing durability against design-basis events was breached. This degradation rate is three times slower than that predicted on the basis of an accelerated aging test with control samples. Infrared spectroscopic analysis revealed suppression in the formation of carbonyl products in the service-used cables. According to the gel fraction measurement, cross-linking is the dominant reaction in such service cables. The unique slow degradation dynamics observed in service cables could be attributed to such oxidation control and the cross-linking reaction. The present study also conducts nuclear magnetic resonance analysis to elucidate the cross-linking point in the main chain.
引用
收藏
页码：730 / 737
页数：8
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