PCCW

Question 1

State PCCW normal temps and basis

Answer 1

Train A: 65-75 for VCT and Seal injection temperature

Train B: 65-78 to help reduce containment temperature since we run fairly close to upper limit of 120F

Question 2

State PCCW high temp trip

Answer 2

135F for 60 seconds (2/2)

Question 3

State PCCW auto start feature

Answer 3

30 second time delay and

NO high temperature in.

Question 4

How is a Thermal Barrier HX Leak isolated

Answer 4

Flow element alarms at 71 GPM
NSO energizes MOV and valve auto closes
Other loops of TB may alarm due to increased flow after 1 loop is isolated

Question 5

State how EPS interacts with CC pumps

Answer 5

The Running PCCW pump will start at SR4
If 2 pumps in same loop were running preferred pump will start
To start standby pump EPS must be reset or RMO reset

Question 6

Discuss how the PCCW TCV and Bypass work together to cool PCCW

Answer 6

The two valves modulate together to maintain temperature per setpoint on the MCB.
On full flow HX outlet opens and HX bypass closes

Question 7

Discuss how PCCW responds on a T-Signal

Answer 7

Isolates: LTDN HX, SF HX, WPB.

Initiates CC to RHR HX

Question 8

Discuss how PCCW responds on a P-Signal

Answer 8

Isolates containment (not TB)
Initiates CC to CBS HX

Question 9

State how PCCW responds on a Low head tank level Setpoint and coincident

Answer 9

<42% 2 of 3 on 1 of 2 trains

Isolates WPB and Rad monitors

Question 10

State how PCCW responds on a Low-Low Head tank level, Setpoint and Coincident

Answer 10

<36% 2 of 3 on 1 of 2 trains

Isolates containment, not TB

Question 11

Discuss why MCB PCCW Flow indication does not represent total system flow

Answer 11

The flow element is down stream of:
SFHX
EAH AC units
CCP oil coolers