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A 3-D and Time Dependent Software for Particles Tracking Base on Monte Carlo Method

Ghaderi Mazaher, Meysam | 2020

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  1. Type of Document: Ph.D. Dissertation
  2. Language: Farsi
  3. Document No: 52618 (46)
  4. University: Sharif University of Technology
  5. Department: Energy Engineering
  6. Advisor(s): Salehi, Ali Akbar; Vosoughi, Naser
  7. Abstract:
  8. A highly reliable tool for transient simulation is vital in the safety analysis of a nuclear reactor. Despite this fact most tools still use diffusion theory and point-kinetics that involve many approximations such as discretization in space, energy, angle and time. However, Monte Carlo method inherently overcomes these restrictions and provides an appropriate foundation to accurately calculate the parameters of a reactor. For this reason, in this thesis, a dynamic Monte Carlo code named MCSP (Monte Carlo dynamic Simulation of Particles tracking) is developed for both the steady state and time-dependent simulation of particle (neutrons, photons and electrons) tracking in an arbitrary 3D geometry. The MCSP is able to use either continuous or multi-group energy cross section as well as thermal-hydraulic feedbacks. In order to increase the speed of calculations the MCSP uses parallel programming.By applying the time-dependent methods, the MCSP code was adapted to construct four codes namely MCSP-K, MCSP-NOD, MCSP-Explicit and MCSP-VGE. The MCSP-K code examines the totality of a neutronic system and is unable to obtain the desired parameters in any subdivision of a system. On the other hand, MCSP-Explicit code, is able to obtain all the parameters required in any subdivision of the system. The MCSP-NOD code abilities are something between the properties of previous ones. it is able to examine and obtain the desired parameters in different parts of the system depending on the size of the nodes defined. Despite of the two previous codes, this code is not capable of using a continuous cross section and can only read one material per node. the shape and size of the nodes are not also important in this code and will not affect the results. Finally, MCSP-VGE is a code for transporting photon and electron in a system in which the geometry and materials change over time. The results of the verification show the ability of these codes to simulate the reactor and radiotherapy
  9. Keywords:
  10. Neatrons ; Photons ; Monte Carlo Method ; Particles Tracking ; Electron ; Time Dependent Particles Tracking

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