Separation Techniques in NPP Steam Generators

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What is the purpose of a submerged perforated plate (SPP) in steam load equalization?

To cool down the steam-water mixture

To increase hydraulic resistance

To supply steam to the vane swirler

To remove water through holes by centrifugal force (correct)

Where are centrifugal separators commonly applied in PWR NPPs?

On the turbine blades

In vertical steam generators (correct)

In the condenser

In the reactor core

What happens to the water in a centrifugal separator according to the operating principle?

It is converted into steam

It is cooled down before being removed

It is stored in a separate tank

It is thrown onto the walls by centrifugal force and removed through holes (correct)

What is a key condition for the effective operation of centrifugal separators?

Correct selection of steam flow rate Signup and view all the answers

What is a disadvantage of centrifugal separators mentioned in the text?

Considerable hydraulic resistances Signup and view all the answers

Where are separators typically fixed according to the text?

Over the tube bundle Signup and view all the answers

What is the main factor that determines the efficiency of gravitational separation in steam generators?

Superficial steam velocity Signup and view all the answers

Which component is responsible for separating moisture drops by gravitational force in NPP steam generators?

Separator Signup and view all the answers

What is the main purpose of the louvre separator in the separation design of vertical steam generators (PWR)?

To decrease steam moisture content Signup and view all the answers

In NPP steam generators, what is the combination of two processes involved in steam separation?

Separation of steam-water mixture and steam drying Signup and view all the answers

To achieve high-purity steam in NPPs, what must be restricted according to the text?

% moisture carryover by steam Signup and view all the answers

What is the moisture content requirement for saturated steam turbine entry mentioned in the text?

$y \leq 0.2%$ Signup and view all the answers

What is one of the consequences of moisture (water droplets) in steam, generated in SG's evaporator?

Reduction in efficiency of heat exchange in superheater Signup and view all the answers

Which component of a turbine is vulnerable to erosive-corrosive wear due to moisture in steam?

Steam inlet components Signup and view all the answers

What is the primary issue associated with roughness growth on turbine blades?

Decrease in turbine stage efficiency Signup and view all the answers

In VVER (PWR) units, what contaminates the saturated steam at low pressures?

Water droplets with dissolved salts and impurities Signup and view all the answers

What is the main purpose of separation in NPP steam generators?

Reduce erosive-corrosive wear in turbines Signup and view all the answers

Where is the characteristic erosive damage typically found in saturated steam turbines?

High pressure cylinder metal Signup and view all the answers

Separation Techniques in NPP Steam Generators

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