CVCS: Chemical & Volume Control System Flashcards Preview

LOIT Systems 2018 > CVCS: Chemical & Volume Control System > Flashcards

Flashcards in CVCS: Chemical & Volume Control System Deck (14):
1

From where does Letdown tap off of the RCS?

Between the #2 SG and the 2B RCP.

2

What is the purpose in the Delay Coils? How do they work?

They allow for the decay of N-16 gammas. They are 2 12 foot long 16" diameter pipes that dramatically slow the letdown flow.

3

How does CHB-UV-515 fail on a loss of air or power?

Closed

4

How does CHA-UV-516 fail on a loss of air or power?

Closed

5

How does CHB-UV-523 fail on a loss of air or power?

Closed

6

What signals will automatically close CHB-UV-515?

SIAS
Regen Heat Exchanger Outlet temp > 413F

7

What signals will automatically close CHA-UV-516?

CIAS
SIAS

8

What signals will automatically close CHB-UV-523?

CIAS
LDHX outlet temp > 135F

9

On what component specifically does the RHX minimize thermal shock?

The Reactor Vessel inlet nozzles

10

Under what temperature does the RHX maintain letdown outlet temperature under normal operating conditions?

450F

11

How do the Letdown Control Valves (CHE-LV-110P/Q) fail on a loss of air?

Closed

12

How does a loss of NNN-D11 affect the Letdown Control Valves (CHE-LV-110P/Q)?

PLCS will lose power which will cause these valves to fail closed.

13

How does a loss of NKN-D42 affect the Letdown Control Valves (CHE-LV-110P/Q)?

They will lose indication only.

14

During normal operation, how many Letdown Control Valves are in service? Why?

One.
Sufficient differential pressure exists between the RCS and CVCS to drive the required flowrate.