Evaluation of combustion characteristic of thermal degraded cables in nuclear power plant

In this study, combustion character of thermal degraded electrical cable for the nuclear power plant was evaluated. To make aging degradation electrical cables, accelerated thermal ageing tests were carried. The electrical cable combustion tests on a simple cable tray were applied to evaluate combustion character of thermal degraded electrical cable. Temperature of the accelerated thermal ageing tests were 90degC. 80degC, 70degC and period of tests were 10, 20, 40 days respectively. Finally, combustion tests on the simple cable tray was analyzed by FDS (Fire Dynamics simulation). FDS analysis software apply two fire models (one model was based on heat released rate: HRR model, the other was based on chemical reaction: CR model). In this case, the HRR model was applied. Heat released rate calculated by the FDS analysis was similar to it by the electrical cable combustion tests. (author)