EXPERIMENTAL CLASS 5STEAM GENERATOR2015.05.15

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

heat S/G heat Turbine

Primary water

Secondary water

S/G consists of; U-tubes

Moisture Separator (Steam Dryer) 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

EXPERIMENT 5. STEAM GENERATOR

EXPERIMENTAL CLASS 6PUMP2015.05.15

Pump Type 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

EXPERIMENT 6. PUMP

ROTORDYNAMIC PUMP VS POSITIVE DISPLACEMENT PUMP

10

Characteristic curve of Rotor-dynamic pumpCharacteristic curve of Positive Displacement pump

Rotor-dynamic pump VS Positive displacement pump

CAVITATION-VAPOROUS (H2O)

12

<Pressure profile inside a centrifugal pump>

CAVITATION-GASEOUS(AIR)

13<Performance reduction due to air in the pumps>

CAVITATION

14

REACTOR COOLANT PUMP

15

ASSIGNMENT

16

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.