NUMERICAL AND EXPERIMENTAL INVESTIGATION OF PASSIVE HEAT REMOVAL FROM POROUS BED IN PATH FACILITY
In case of a hypothetical core disruptive accident in a Fast
Breeder Reactor (FBR) heat removal from core debris is
essential to avoid breach of main vessel. Towards achieving
this objective, natural convection heat transfer experiments
along with numerical simulations are carried out to assess
debris bed coolability settled on the in-vessel core catcher.
The numerical investigation with debris bed using effective
thermal conductivity model as well as porous media heat
transfer from debris in PATH facility is carried out. This study is helpful to understand the influence of different boundary conditions and effect of internal components on passive heat transfer from the core debris. The numerical results obtained are validated against in- house experimental data of 1:4 scale model of PFBR i.e. PATH experimental facility. The study confirmed the convective flow through the porous debris bed and better coolabilty of debris as compared to effective thermal conductivity model. However, a significant higher fluid temperature in chimney location is observed. This also suggested increasing in existing chimney height to ease the flow of fluid through passage from bottom of core catcher.