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Provide a New Simulation of Pebble Bed Reactor

Bahrami, Ali Akbar | 2016

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 48824 (46)
  4. University: Sharif University of Technology
  5. Department: Energy Engineering
  6. Advisor(s): Vosoughi, Naser
  7. Abstract:
  8. High level of safety, environmental issues, economic efficiency and on-line refueling give the potential to pebble bed reactors to have a unique significance among the new generation of reactors. Here the reactor core is an assembly of the fuel pebbles and moderators which are randomly located in the core. This feature makes it difficult and ingenious for simulating, moreover this kind of distribution makes us unable to know the exact structure of the core. Fuel pebble is made of many tiny particles called TRISO which are again randomly located in the graphite lattice, therefore makes the reactor's simulation too difficult. Due to these problems, simulation of this reactor with certain codes based on diffusion equation, including CATATION is not possible. On the other hand Cartesian structure of Monte Carlo MCNP code, have made spherical geometries'¬ simulation more difficult and specific. Following the previous researches, this study is aimed to deliver an exact and real simulation of pebble bed reactor by using the Discrete Element Method (DEM) and the Monte Carlo MCNP code. Since the pebbles come from the top of the core and then affected by forces such as gravity, helium pressure, parapet and pebbles around and eventually is being removed from the end of the core, it is possible to the use discrete element method in the simulation of moderator and pebbles fuel motion in the reactor core. In most studies, this work has been made by static method. However these approaches have reasonable results but they are not match with the physics of reactor core, so they always accompanied by some objections. Using discrete element method, in addition to being consistent with the physics of the problem, it is also possible to simulate the core's dynamic. According to the stated problems this project is aimed to simulate pebble bed reactor's core more accurately. In this regard, at first fuel pebble in quite accurate and random arrangement of fuel particles has been simulated and then the simulation of reactor's core based on the MCNP extended FILL card's property and the results of each pebble's location over time in discrete element method has been done. To validate the accomplished simulation in this study, the initial loading of the HRT-10 reactor was selected in this way
  9. Keywords:
  10. Pebble Bed Reactor ; Discrete Element Method ; Dynamic Simulation ; Reactor Cores ; Dynamic Simulation of Pebble Bed Reactors Core

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