AGEING MANAGEMENT OF LOW VOLTAGE CABLES AT DARLINGTON NUCLEAR STATION


11th International Conference on CANDU® Maintenance and Nuclear Components - 2017 Oct. 01-04

Presented at:
11th International Conference on CANDU® Maintenance and Nuclear Components
2017 Oct. 01-04
Location:
Toronto, ON Canada
Session Title:
Aging Management 1 - Major Components

Authors:
D. Rouison (Kinectrics Inc)
A. Ghaforian (Ontario Power Generation)
M. Riahinezhad (Kinectrics Inc)
  

Abstract

Low voltage (LV) power, control and instrumentation cables are used in all systems essential to the safe and reliable operation of nuclear power plants. A number of CANDU power plants are currently planning or going through refurbishment which will extend their life for another 30 to 40 years. This process is based on the replacement of major components and a detailed assessment of other assets to ensure their continued operation for the remaining life of the plant. The vast number of LV cables found in each nuclear plant does not allow full replacement to occur, therefore aging management programs have to be implemented to determine and monitor their condition. In this presentation, Darlington NGS and Kinectrics present key aspects of the Ontario Power Generation Cable Surveillance program. This program ensures the implementation of the Cable Condition Monitoring program which relies on the precise identification and characterization of LV cables insulation and jacket in key areas of the plant. The field assessment of these cables is based on material based techniques such as Near Infrared Spectroscopy (NIR) and indenter modulus. Sacrificial cables installed in the plant at its inception are also analyzed in the laboratory at regular intervals to provide further evidence of the condition of the cables. The implementation of the program is illustrated with results obtained in recent years on instrument and control cables in the field and in the laboratory. The test results have shown limited aging for most cables and support their continued operation.

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