Abstract
In this study, a 3-D transient model is established for simulation of the diffusion path of smoke and gaseous suppressant (CO2) in the maanshan NPP’s control building when fire disaster is occurred. The simulation tool is FDS (Fire Dynamics Simulator) developed by NIST. The 3-D transient model contains large objects and HVAC systems (Heating, Ventilation and Air Conditioning systems) in the control building. The study chooses the conservative conditions as some assumptions and initial conditions of the simulation. The study modifies the SFPE (Society of Fire Protection Engineers) safety standards to decide the fire zones are safety for human or not. Each fire zone could be divided three situations due to the different scenarios, the result of each situation affect the operators in control room. Fire will produce high temperature and high pressure and the automatic fire extinguishing system activated will produce high pressure due to the CO2 injected, this study discuss the two factors how to affect the movement of smoke particles and carbon dioxide and the change of the safe indicators, each factor will cause different impact of control room. This study only contains the consequences of fire zone 2 and fire zone 5, the conclusions from the consequences are (1) the safe regions are varied with the location of events, (2) the diffusion velocity of smoke will be different due to CO2 injected, (3) the control room and the auxiliary shutdown rooms are danger regions at the end of simulation.