Experimental Class 5 Steam Generator 2015.05.15

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

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

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

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

Experimental Class 6 Pump 2015.05.15

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

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

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

Rotordynamic pump VS Positive displacement pump 4/20/2017 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

Rotor-dynamic pump VS Positive displacement pump 400,000 L/min: 400ton/min http://www.pdhengineer.com/Course%20Files/Completed%20Course%20PDF%20Files/Pumps%20Centrifugal%20vs%20Positive%20Displacement%20Word%20Document.htm

Cavitation-Vaporous (H2O) 4/20/2017 Cavitation-Vaporous (H2O) <Pressure profile inside a centrifugal pump>

Cavitation-Gaseous(Air) 4/20/2017 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>

4/20/2017 Cavitation

4/20/2017 Reactor Coolant Pump

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.