Steam Generator

Question 1

Function

Answer 1

• Under normal operating conditions, the S/Gs provide sufficient heat transfer capacity to convert feedwater to steam, as required, for the turbine and auxiliaries during all modes of operation.
• Provides sufficient heat removal capacity to allow the main steam system to remove the total heat generated in the RCS during accident conditions.

Question 2

Steam Flow Limiter

7 Ventruis

Answer 2

• Protect the containment from exceeding its design pressure and prevent excessive cooldown rate of the RCS by limiting the steam flow that can result from a MSLB.
• Does not effect normal operations.

Question 3

Swirl Vane Moisture separator

Answer 3

• 1st stage moisture separation occurs in the swirl vanes where the velocity of the steam-water mix is converted to a rotary velocity, creating a centrifugal effect.
• 3 swirl vane assemblies per s/g
• Separated water is drained back to the downcomer where it combines with feedwater for another pass

Question 4

Quatrefoil tube

how many? does what?

Answer 4

-6 quatrefoil tube support plates provide lateral support, and minimize vibration

Question 5

What Rx trip is associated with S/Gs

Answer 5

-Lo-lo level (16%)