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REACTOR PRESSURE VESSEL FLOWS

REACTOR PRESSURE VESSEL FLOWS. Dr A C Thompson C M Hodge. OVERVIEW. Introduction. Method - Phoenics VR model. Results: RPV inlet flows F low patterns & fixes Conclusions . INTRODUCTION. Design Study. Two core PWR. Single inlet/outlet RPVs. METHOD FLOW MODELLING.

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REACTOR PRESSURE VESSEL FLOWS

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  1. REACTOR PRESSURE VESSEL FLOWS Dr A C Thompson C M Hodge

  2. OVERVIEW • Introduction. • Method - Phoenics VR model. • Results: • RPV inlet flows • Flow patterns & fixes • Conclusions

  3. INTRODUCTION • Design Study. • Two core PWR. • Single inlet/outlet RPVs.

  4. METHOD FLOW MODELLING • Phoenics 3.1, VR. • Single Phase, unheated flow. • Simple turbulence model. • Polar Coordinates.

  5. METHOD - RPV MODEL • Vessel walls and base.

  6. METHOD - RPV MODEL • Vessel walls and base. • Barrel shields and nozzles.

  7. METHOD - RPV MODEL • Core Structures. • Core Inlets.

  8. CORE INLET FLOW

  9. SHIELD FLOW WITH DUAL INLET

  10. CORE INLET FLOW SINGLE INLET

  11. SHIELD FLOW WITH SINGLE INLET • Upward flow in both outer Shield paths.

  12. THE FLOW FIX DEVICE

  13. SHIELD FLOW WITH FIX 1 • Downward flow in outer Thermal Shield. • Upward flow in intermediate Shield.

  14. THE FINAL FLOW FIX DEVICE • 2 Concentric Scoops. • 1800 Circumference.

  15. SHIELD FLOW WITH FINAL FIX • Downward flow in all Thermal Shields.

  16. CORE INLET FLOW- FINAL FIX

  17. GRID AT CORE 1ST PASS INLETS

  18. CORE INLET VELOCITY PROFILE

  19. CONCLUSIONS • VR Interface Advantages: • Reduced Model build time. • Improved ability to adjust model. • Viewing of results much improved. • Highlighted unexpected area of concern. • Thermal shields. • Low loss fix easily developed. • Core inlet flow uniformity. • Grid sensitivity.

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