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<p>Electrical cable fires in nuclear power plants (NPPs) are considered a major risk scenario. This study conducted blind simulations by applying the pyrolysis input parameters based on mass flux release from the cable tray surface in the Fire Dynamics Simulator to cable tray fires occurring in nuclear power plants. The results were compared and validated against the BCM-S1 (Benchmark) and CFP-D1 (Cable Fire Propagation) experiments of PRISME-3 (Propagation d’un incendie pour des scénarios multi-locaux élémentaires). The thermophysical properties of electrical cables were adopted from the literature and SFPE Handbook. The numerical reliability of the model was assessed through a grid sensitivity analysis (D*/dx = 4, 10, and 16; dx = 0.20, 0.10, and 0.05&#xa0;m). For BCM-S1, the predicted heat release rate profiles qualitatively agreed with the experiments at dx = 0.05–0.10&#xa0;m, and the global error remained within 14.38%. In CFP-D1, the local error was within − 27.25% at dx = 0.05–0.10&#xa0;m; however, over-prediction was observed at dx = 0.20&#xa0;m. Considering both accuracy and computational efficiency, a mesh size of dx = 0.10&#xa0;m is recommended. The seven-step modeling procedure and verification metrics presented in this study are expected to enhance the reliability and reproducibility of cable fire analyses in NPPs safety compartments.</p>

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Validation Study of Electrical Cable Fires Using Pyrolysis Inputs Based on Mass Flux Release in the FDS Model

  • 期刊论文

  • 发表日期：

    2026年4月11日

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  • Hyun-Min Kang,
  • Jaiho Lee,
  • Ho-Young Lee

摘要

Electrical cable fires in nuclear power plants (NPPs) are considered a major risk scenario. This study conducted blind simulations by applying the pyrolysis input parameters based on mass flux release from the cable tray surface in the Fire Dynamics Simulator to cable tray fires occurring in nuclear power plants. The results were compared and validated against the BCM-S1 (Benchmark) and CFP-D1 (Cable Fire Propagation) experiments of PRISME-3 (Propagation d’un incendie pour des scénarios multi-locaux élémentaires). The thermophysical properties of electrical cables were adopted from the literature and SFPE Handbook. The numerical reliability of the model was assessed through a grid sensitivity analysis (D*/dx = 4, 10, and 16; dx = 0.20, 0.10, and 0.05 m). For BCM-S1, the predicted heat release rate profiles qualitatively agreed with the experiments at dx = 0.05–0.10 m, and the global error remained within 14.38%. In CFP-D1, the local error was within − 27.25% at dx = 0.05–0.10 m; however, over-prediction was observed at dx = 0.20 m. Considering both accuracy and computational efficiency, a mesh size of dx = 0.10 m is recommended. The seven-step modeling procedure and verification metrics presented in this study are expected to enhance the reliability and reproducibility of cable fire analyses in NPPs safety compartments.