Reactor Coolant pumps

Question 1

What is the purpose of the Reactor Coolant Pumps (RCPs)? How many are there? Where are they located?

Answer 1

Provide the motive force to circulate reactor coolant for heat transfer from the Reactor Core to the Steam Generators.
4.
They are located in containment.

Question 2

What system powers the RCPs and what buses do each run off of?

Answer 2

6.9kV electric powers the RCPs and the electrical buses that power them are 35A, 35B, 35C, and 35D respectively

Question 3

Define “departure from nucleate boiling”. What is the ratio of DNBR that we want?

Answer 3

the formation of a local vapor layer, causing a dramatic reduction in heat transfer capability
>1.30

Question 4

Name and define all 4 distinct flow paths associated with controlled leakage.

Answer 4

1. Pump Flow - coolant flow through the pump
2. Thermal Barrier Heat Exchanger Flow - coolant flow through the Thermal Barrier Heat Exchanger
3. Seal Flow - RCP Seal Water Flow
4. Thermal Barrier Heat Exchanger Cooling Water Flow - RPCCW flow for cooling the coolant flow through the heat exchanger tubes

Question 5

Describe the function and location of the Thermal Barrier

Answer 5

Designed to cool water coming FROM the RCS

Question 6

Describe the function and location of the Shaft Seal Assembly

Answer 6

Impose a pressure breakdown from loop pressure to ambient, limiting coolant losses

Question 7

Describe the function and location of the Stator

Answer 7

The stator provides a location for the inducement of a rotating magnetic field, which is used for rotating the rotor

Question 8

Describe the function and location of the Rotor

Answer 8

The stators rotating magnetic field induces an electrical current flow in the rotor windings, thereby developing a torque capable of driving the pump impeller

Question 9

Describe the function and location of the Upper and Lower Oil Reservoirs

Question 10

Describe the function and location of the Upper bearing assembly

Question 11

Describe the function and location of the Flywheel

Question 12

Describe the function and location of the Anti Reverse Rotation Device

Question 13

Describe the function and location of the Oil Lift System

Question 14

What happens to this system in response to a