Separation Techniques in NPP Steam Generators

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Questions and Answers

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?

<p>Correct selection of steam flow rate (A)</p> Signup and view all the answers

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

<p>Considerable hydraulic resistances (D)</p> Signup and view all the answers

Where are separators typically fixed according to the text?

<p>Over the tube bundle (D)</p> Signup and view all the answers

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

<p>Superficial steam velocity (A)</p> Signup and view all the answers

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

<p>Separator (A)</p> Signup and view all the answers

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

<p>To decrease steam moisture content (D)</p> Signup and view all the answers

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

<p>Separation of steam-water mixture and steam drying (D)</p> Signup and view all the answers

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

<p>% moisture carryover by steam (D)</p> Signup and view all the answers

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

<p>$y \leq 0.2%$ (C)</p> Signup and view all the answers

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

<p>Reduction in efficiency of heat exchange in superheater (B)</p> Signup and view all the answers

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

<p>Steam inlet components (C)</p> Signup and view all the answers

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

<p>Decrease in turbine stage efficiency (C)</p> Signup and view all the answers

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

<p>Water droplets with dissolved salts and impurities (D)</p> Signup and view all the answers

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

<p>Reduce erosive-corrosive wear in turbines (A)</p> Signup and view all the answers

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

<p>High pressure cylinder metal (B)</p> Signup and view all the answers

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