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Calculation of Distribution and Variation of Hydrogen Concentration After LB-LOCA Accident in the Containment of Bushehr NPP Using MELCOR Code

Salahshour, Fatemeh | 2016

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 49217 (46)
  4. University: Sharif University of Technology
  5. Department: Energy Engineering
  6. Advisor(s): Ghofrani, Mohammad Bagher
  7. Abstract:
  8. In this study, the determination of the distribution and the differences concentration of hydrogen in containment of Bushehr power plant by modeling of containment and Hydrogen removal system of Bushehr power plant during LB-LOCA accident is accomplished. In Bushehr nuclear power plant, which has a unique design, the containment is similar to PWR power plants with a metal sphere, but the installed reactor is a VVER-1000. After a full study on the containment and its systems, the required data for modeling is gathered and afterwards, the engineering handbook is prepared for MELCOR input code and then the modeling and size classification of the containment is done in 4 different ways, including the control volumes of 1, 9, 23 and 30 and then density of hydrogen is examined. The result of studying control volume sensitivity reveals that 30 control volumes for the hydrogen concentration inside the containment, is proper for LOCA accident. 96 PARs are used in the power plant. when 18% failure occur, PAR numbers are reduced to 80. In this research, the Hydrogen removal System is modeled and results prove that the hydrogen recombiner in the case of a 10% damage has the capability to decrease hydrogen concentration to the threshold of hydrogen gas igniter after the loss of coolant accident. The best time step for MELCOR code convergence in the case of LOCA accident is 0.001 s. Also best efficiency with considering the time step error for PAR is 65%
  9. Keywords:
  10. Containment ; Safety Systems ; Bushehr Nuclear Power Plant ; Large Break Less-of-Coolant Accident (LB-LOCA) ; Hydrogen Removal System ; Hydrogen Volume Concentration

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