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Neutronic Simulation of Generation IV Prismatic High Temperature Reactors and Noise Analysis

Torabi Ardekani, Abbas | 2015

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  1. Type of Document: Ph.D. Dissertation
  2. Language: Farsi
  3. Document No: 47232 (46)
  4. University: Sharif University of Technology
  5. Department: Energy Engineering
  6. Advisor(s): Ghofrani, Mohammad Bagher
  7. Abstract:
  8. 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 of cross sections generated in this study have been done and parameters such as fuel and moderator temperature coefficient and isothermal temperature coefficients have been calculated. In the third part, a complementary study, deterministic calculations have been done with the use of DRAGON and Donjone codes. Besides comparing the results with stochastic calculations, multi group macroscopic cross sections for the last part of thesis also have been also generated. A simultaneous stochastic and deterministic calculation in zero and full power states with approximately similar inputs and assumptions is one of the specific features of this research. In the last part of thesis, application of reactor noise analysis has been investigated for the first time on the HTTR
  9. Keywords:
  10. TRISO ; Critical Hight ; High Themprature Gas-Cooled Reactor (HTGR) ; Stochastic Calculations ; Multiplication Factor ; Deterministic Calculations ; Noise Analysis

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