THERMAL ANALYSIS of the reactor vault

I carried out this project in IGCAR.As a part of this project we have developed a Computational Fluid Dynamic model comprising of main vessel, safety vessel and reactor vault of PFBR.Steady and transient thermal hydraulic analysis of the system have been performed considering natural convection of nitrogen, surface radiation among the main vessel , safety vessel, and the reactor vault and heat conduction through the support shell .The focus of the study has been to estimate the temperature evolution in the vault during the loss of cooling.It has been established that 4 hours after the loss of cooling, the vault attains a temperature of only 96 degree , which is much less than the limiting value of 177 degree On restoration of cooling , the vault temperature is brought down to the nominal value in 1 hour.These data are very important in deciding the safety action to be taken.The Design of the layout of reactor vault was done using GAMBIT and the analysis was carried out using STAR_CD aCFD code software.The validation of the code was done considering a parallel plate flow.