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http://dx.doi.org/10.7731/KIFSE.2016.30.5.074

Effect of the HVAC Conditions on the Smoke Ventilation Performance and Habitability for a Main Control Room Fire in Nuclear Power Plant  

Kim, Beom-Gyu (KHNP Central Research Institute)
Lim, Heok-Soon (KHNP Central Research Institute)
Lee, Young-Seung (KHNP Central Research Institute)
Kim, Myung-Su (KHNP Central Research Institute)
Publication Information
Fire Science and Engineering / v.30, no.5, 2016 , pp. 74-81 More about this Journal
Abstract
This study evaluated the habitability of operators for main control room fires in nuclear power plants. Fire modeling (FDS v.6.0) was utilized for a fire safety assessment so that it could determine the performance of the smoke ventilation and operator habitability with the main control room. For this study, it categorized fire scenarios into three cases depending on the conditions in the HVAC system. As a result of fire modelling, it showed that Case 1 (with HVAC) would give rise to the worst situation associated with the absolute temperature, radiative heat flux, optical density, and smoke layer height as deliberating the habitability and smoke ventilation. On the other hand, it showed that Cases 2 (w/o HVAC) and 3 can maintain much safer situations than Case 1. In the case of temperature at 820 s, Cases 2 and 3 were up to approximately 63% greater than Case 1 in the wake of ignition. In addition, the influence of radiative heat flux of Case 1 was even larger than Cases 2 and 3. That is, the radiative heat fluxes of Cases 2 and 3 were approximately 68% higher than Case 1. Furthermore, when it comes to considering the optical density, Case 1 was approximately 93% greater than Cases 2 and 3. Accordingly, it expected that the HVAC system can influence a the performance on the smoke ventilation that can be sustainable for operator habitability. On the other hand, it revealed an inconsecutive pattern for the smoke layer height of Cases 2 and 3 because supply vents and exhaust vents were installed within the same surface.
Keywords
FDS v.6.0; HVAC; Habitability; Main control room; Smoke ventilation;
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