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An Investigation on Counter Current Flow Limitation (CCFL) in Hot Leg of Boushehr Nuclear Power Plant Using CFX

Allahyari, Abdolhasib | 2025

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 58573 (46)
  4. University: Sharif University of Technology
  5. Department: Energy Engineering
  6. Advisor(s): Ghaffari, Mohsen
  7. Abstract:
  8. This research aims to numerically investigate the Counter-Current Flow Limitation (CCFL) phenomenon in the hot leg of the Bushehr Nuclear Power Plant, with a focus on its unique Emergency Core Cooling System (ECCS) design. To achieve this, Computational Fluid Dynamics (CFD) was utilized through the commercial software ANSYS CFX. A two-stage methodology was employed: Initially, the numerical model was validated against experimental data from the TOPFLOW facility to ensure its predictive accuracy for two-phase flow phenomena. Subsequently, the validated model was used to simulate the CCFL phenomenon in the real, full-scale geometry of the Bushehr power plant's hot leg, with boundary conditions derived from the RELAP system code. The results from the validation stage demonstrated excellent agreement with the experimental data. In the main simulation, the occurrence of CCFL in the Bushehr hot leg was clearly observed, where the high-velocity steam flow impeded the complete drainage of injected coolant towards the reactor core. These findings confirm that the specific ECCS configuration of this plant has the potential to impair the emergency core cooling process during Loss-of-Coolant Accident (LOCA) scenarios, offering a deeper insight into its thermo-hydraulic behavior
  9. Keywords:
  10. Emergency Core Cooling System (ECCS) ; Hot Leg ; Counter-Current Flow Limitation (CCFL) ; TOPflow Laboratory ; Loss-of-Coolant Accident (LOCA) Scenarios ; Computational Fluid Dynamics (CFD) ; Bushehr Nuclear Power Plant

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