Effects of cable tray configuration on fire spread
Résumé
Fires involving electrical cables are one of the main fire hazards in Nuclear Power Plants (NPPs). The aim of this work is to study the impact of cable tray configuration on fire spread over multiple cable trays. Two real-scale cable tray fire tests were thus carried out as part of the OECD PRISME-2 Project (CORE campaign) for studying the effect of a protected cable tray (CORE-2) and slanted ladder cable trays (CORE-3) on the main fire characteristics. By considering new configurations, these tests completed the preliminary CFSS tests of the PRISME-2 project which involved five horizontal ladder cable trays. The CORE-2 test implemented the same horizontal trays set-up except that the lower tray was a protected cable tray. Compared with the five ladder cable trays set-up, the protected cable tray delayed the ignition of about 16 min and led to decrease the total mass loss (TML). Furthermore, the fire growth rates and the heat release rate (HRR) were slightly higher for the CORE-2 test. The CORE-3 test used five horizontal ladder cable trays 1 m long followed by five slanted ladder cable trays 2 m long with a 30 degree angle. This configuration shortened the ignition of about 4 min, led to similar TML and increased the fire spread over the cable trays meaningfully and the HRR peak compared with the horizontal ladder trays configuration. Finally, the other fire characteristics such as the average effective heat of combustion or the gas and soot yields were not affected by the presence of the lower protected cable tray or the ladder cable trays orientation (horizontal or slanted).
Domaines
Physique [physics]
Origine : Fichiers produits par l'(les) auteur(s)
Licence : Copyright (Tous droits réservés)
Licence : Copyright (Tous droits réservés)