1. Experimental Class 5 Steam Generator

2. Experiment 5. Steam Generator
PWR system configuration and S/G
S/G : Steam Generator
Cross point between 1st and 2nd sides of the NPP
Delivers heat
Primary Barrier for safety
Height : 21m
Weight : 800t
Reactor
S/G
Turbine

3. Experiment 5. Steam Generator
S/G consists of;
U-tubes
Moisture Separator (Steam Dryer)
Primary water
Secondary water
water

4. Experiment 5. Steam Generator
U-tubes isolate primary loop from the secondary loop
If leak of the tubes -> Shut-down
Prevention of Radioactive primary water release
Degradation :
Strict inspection & Repair process
For Corrosion Problem
Water Chemistry strictly monitored
Chemical Treatment
Tube Material Changes : Inconel 600 ->690

5. Experiment 5. Steam Generator
Moisture separators comprises of two principles :
Centrifugal Force
Pocket

6. Experimental Class 6 Pump

7. Experiment 6. pump Pump Type Cavitation Reactor Coolant Pump
Rotor-dynamic pump
Positive displacement pump
Rotary Pump
Reciprocating Pump
Cavitation
Reactor Coolant Pump

8. Experiment 6. pump Rotor-dynamic Pump
Centrifugal( Volute ) pump Uses Rotational centrifugal force
Axial Flow Pump converts kinetic Energy into Pressure

9. Experiment 6. pump Positive Displacement Pump
Using mechanical force to generate pressure head
Rotary Pump (Robe type, Vane Type)
Reciprocating Pump : Piston’s movement in the cylinder

10. Rotordynamic pump VS Positive displacement pump
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Rotordynamic pump VS Positive displacement pump
Both are used in nuclear reactors but have different applications.
Characteristic curve of Rotor-dynamic pump
Characteristic curve of Positive Displacement pump

11. Rotor-dynamic pump VS Positive displacement pump
400,000 L/min: 400ton/min

12. Cavitation-Vaporous (H2O)
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Cavitation-Vaporous (H2O)
<Pressure profile inside a centrifugal pump>

13. Cavitation-Gaseous(Air)
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Cavitation-Gaseous(Air)
In the context of centrifugal pumps, the term cavitation implies a dynamic process of formation of bubbles inside the liquid, their growth and subsequent collapse as the liquid flows through the pump.
<Performance reduction due to air in the pumps>

14. 4/20/2017
Cavitation

15. 4/20/2017
Reactor Coolant Pump

16. Exp. 5: S/G - write down in your own words within 1 page
4/20/2017
Assignment
Exp. 5: S/G - write down in your own words within 1 page
Find types of SG degradation and suggest solutions with your point of view in 1 page
Exp.6: Pump - write down in your own words within 1 page
Explain why 1) pumps follow an isentropic line theoretically, 2) pumps deviate from the isentropic line in real applications
Explain where rotor-dynamic pumps and positive displacement pumps are applied in NPP. Add reasons.
Give some measures to avoid cavitation.