Classification of Steam Generators in Power Plants

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What is the cost of plant downtime per day due to SG failure?

$300,000 (correct)

$200,000

$400,000

$100,000

How many hours had the SG at the South Ukrainian NPP been in operation before it broke down?

6900 hours (correct)

8000 hours

5000 hours

10000 hours

What is the design lifetime of the SG that broke down at the South Ukrainian NPP?

30 years (correct)

20 years

40 years

50 years

What is one of the pros of using water as a coolant?

Low chemical activity Signup and view all the answers

What is a significant con of using water as a coolant?

Dependence of density on temperature Signup and view all the answers

Which coolant has a capture cross-section of 0.003 barn?

Water Signup and view all the answers

What is a property that makes water an attractive coolant option?

Low cost and high availability Signup and view all the answers

What is a limitation imposed on water coolants due to corrosive activity?

Corrosion product content must be minimized Signup and view all the answers

Which coolant has the highest thermal capacity?

CO2 Signup and view all the answers

What is the main function of a NPP steam generator?

To produce nonradioactive steam in the secondary circuit Signup and view all the answers

Which best describes the coolant used in NPP steam generators?

A medium that draws off heat from the fuel elements Signup and view all the answers

What are the requirements for a NPP steam generator?

Must be cheap in production and installation Signup and view all the answers

What is the purpose of a steam generator's design?

To provide for the required lifespan with maintenance Signup and view all the answers

Which statement about NPP steam generators is true?

Elements must be reliable, safe, and resistant to corrosion Signup and view all the answers

What is a notable fact about the cost of a SG complex for a WWER-1000 plant?

$30 million in 2003 Signup and view all the answers

What are the constituent elements of a SG in the most general case?

Economizer, Evaporator, Primary Superheater, Secondary Superheater Signup and view all the answers

How are SGs classified based on the working fluid motion pattern in the evaporator and economizer?

SG with natural circulation; SG with multiple forced circulation; once-through SG Signup and view all the answers

Which of the following is NOT a type of NPP SG coolant?

Nitrogen Signup and view all the answers

What are the requirements for nuclear physical properties of a coolant?

High radiation stability and small capture cross-section Signup and view all the answers

Which element is NOT included in the constituent elements of a SG in the most general case?

Condenser Signup and view all the answers

What is the main difference between once-through SG and SG with natural circulation?

Working fluid motion pattern Signup and view all the answers

What does the pH value characterize in water?

Concentration of free hydrogen ions Signup and view all the answers

In pure water, what is the pH value?

7 Signup and view all the answers

What characterizes water with a pH greater than 7?

Alkaline reaction Signup and view all the answers

What requirements are needed for thermal physical properties of water?

High thermal conductivity and capacity Signup and view all the answers

How is water characterized with an increased content of hydrogen ions?

Acid reaction Signup and view all the answers

What does the hydrogen index (pH) represent in water?

Logarithm of hydrogen ion concentration with a negative sign Signup and view all the answers