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Neutronic Calculations of Various Fuel Management Options of HTTR
, M.Sc. Thesis Sharif University of Technology ; Ghofrani, Mohammad Bagher (Supervisor) ; Vosoughi, Naser (Supervisor)
Abstract
HTGRs are considered as 4th generation reactors & have major characteristics such as inherent safety & high temperature applications. In this thesis, HTTR reactor has been selected as a reference reactor &studied at cold zero power (CZP) & hot full power (HFP) states with probabilistic MCNPX 2.6.0 code. At CZP state, radial & axial flux distribution, control rod criticality height with & without considering nitrogen as impurity in fuel blocks, effective multiplication factor at experimental criticality height & finally effective delayed neutron fraction (βeff) have been evaluated. Moreover, at HFP state, prompt neutron life time (λ), effective multiplication factor versus time curve for...
Neutronic Simulation of Generation IV Prismatic High Temperature Reactors and Noise Analysis
, Ph.D. Dissertation Sharif University of Technology ; Ghofrani, Mohammad Bagher (Supervisor)
Abstract
This thesis has been done with the goal of comprehensive neutronic calculation of a small size High Temperature Gas Cooled Reactor and HTTR was selected as a reference reactor for simulations. Calculations are divided into four parts of zero and full power stochastic calculations, deterministic calculations and noise analysis. In zero power calculations, an algorithm is proposed for modeling random arrangement of TRISO particles in the fuel compacts of HTTR. The effect of this arrangement on criticality calculations, i.e. effective multiplication factor and critical position of control rods, is then compared with regular arrangement. In the second part, full power calculations with the use...