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Assessment of BNPP Containment Systems, Against LB-LOCA by MELCOR Code

Heydari Lari Nejad, Mohammad Amin | 2013

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 45770 (46)
  4. University: Sharif University of Technology
  5. Department: Energy Engineering
  6. Advisor(s): Ghofrani, Mohammad Bagher
  7. Abstract:
  8. In this study the modeling of Bushehr power plant containment is considered. In Bushehr atomic 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 date 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 the temperature, pressure and density of hydrogen is examined. The result of studying control volume sensitivity reveals that 23 control volumes for pressure and temperature fluctuations and 30 control volumes for the hydrogen concentration inside the containment, is proper for LOCA accident. In this research, the safety systems of the power plant are modeled as hydrogen recombiner and spray systems and their function reveals that the spray system with 600 m3/h flow rate would decrease the temperature and pressure resulting from the large break loss of coolant accident and also the hydrogen recombiner in the case of a 10% damage has the capability to decrease hydrogen concentration after the loss of coolant accident. The best time step for MELCORE code convergence in the case of LOCA accident is 0.001 s. Also the initial Humidity and the size of sprayed drops in the containment have not much effect on temperature and pressure fluctuations
  9. Keywords:
  10. Bushehr Nuclear Power Plant ; Pressure ; Themperature ; Containment ; Spray System ; Power Plant Safety System

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