Plant Cooling Water

Question 1

At what pressure does the standby PW Pump auto start?

Answer 1

At 40 psi
The Amber light will illuminate and control switch will remained green flagged.

ref: Lesson Plan

Question 2

State the power supplies for:
PWN-P01A
PWN-P01B

Answer 2

PWN-P01A powered from NBN-S01
PWN-P01B powered from NBN-S02

ref: Lesson Plan

Question 3

Unit 1 is at 100% power with all systems in a normal lineup.
‘A’ PW pump trips on overcurrent and the 86 lockout relay actuates.
With no operator action, what is the status of the ‘B’ PW pump?
A. ‘B’ PW pump is not running.
B. ‘B’ PW pump started when the 86 relay actuated for the ‘A’ pump
C. ‘B’ PW pump started when the ‘A’ pump breaker opened
D. ‘B’ PW pump started on low PW header pressure

Answer 3

D

Question 4

Plant Cooling Water supports:

Answer 4

Nuclear Cooling Water
Turbine Cooling Water
Condenser Air Removal
Chlorine Injection System

ref: Lesson Plan

Question 5

What is the minimum level required for PW pump operation?

Answer 5

19ft, this is to prevent losing suction to the PW pumps.

Question 6

When power is lost and restored to NBN-S01 what is the delay timing for the pump starts?

Answer 6

• NC Pumps 10 seconds
• TC Pumps 15 seconds
• PW Pumps 20 seconds

Question 7

Losing Plant Cooling Water will require:

Answer 7

Because of the loss of cooling to the turbine and FWP components, a loss of PW will require a reactor trip if cooling cannot be restored.

Question 8

State the purpose of Plant Cooling Water (PW).

Answer 8

Removes heat from Nuclear Cooling Water, Turbine Cooling Water and Condenser Air Removal Pump seal coolers and rejects this heat to the CW system.
Fills the condenser water boxes and CW piping during start up or after maintenance