Shield Cooling Flashcards

1
Q

What is the purpose of the Shield Cooling System

A

Designed to maintained structural concrete temperature less than 165 F, preventing weakening of the concrete due to moisture loss

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

When is the Shield Cooling System required to be in service?

A

When PCS temperature > 165 F

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

What is required if concrete temperature can’t be maintained below 165 F?

A

Commence a controlled plant shutdown

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

What are the power supplies for P-77A/B, Shield Cooling Pumps

A

P-77A - MCC-2

P-77B - MCC-1

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

What are the control room controls for the shield cooling pumps?

A
  • 3 position handswitch CLOSE/TRIP/PULL TO STANDBY
  • CLOSE - starts pump
  • TRIP - stops pump
  • PULL TO STANDBY - places pump in standby. pump will auto start on low pressure of 35 psig
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

What is the low discharge pressure alarm setpoint for the shield cooling pumps?

A

35 psig

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

How many shield cooling coil sets are there?

A

2 (A and B)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

How many coils are in each shield cooling coil set?

A

1 floor slab coil and 3 wall coils

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

What are the shield cooling temperature and flow alarms?

A

120 F

80 gpm

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

CV-0932/0934, Coil Inlet Supply Valves, design features

A
  • Fail open
  • OPEN/CLOSE keyswitch in Control Room
  • Interlocked so when the valve is closed, its coil set low flow alarm is bypassed
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

Shield Cooling Surge Tank design features

A
  • Sized such that the tank will not overflow from a temperature rise from 60 F to 212 F
  • Makeup water is from T-81
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

CV-0939, Shield Cooling Containment Isolation Valve

A
  • Closes on CHP/CHR

- Normally closed to isolate makeup water from the tank, because CV-0927, Surge Tank Makeup Valve, leaks by

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

How are chemicals added to the Shield Cooling System?

A

Chem add tank on east mezzanine is no longer used. Sodium Nitrite is added directly to the tank

How well did you know this?
1
Not at all
2
3
4
5
Perfectly