Old System Cards > Reactor Coolant System > Flashcards

Reactor Coolant System Flashcards

(52 cards)

Study These Flashcards
1
Q

What is the purpose of the RX coolant system

A

-Transfer thermal energy from core to SG
-Secondary barrier for fission product release
-Sufficient core cooling for all evolutions/transients to
prevent core damage

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

What is the design pressure of the RX Coolant system

A

2500 PSIA

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

What are the design flow characteristics of the RCS

A

-Minimum flow ensures adequate heat removal in all
modes
-Maximum flow limits uplift forces on the core

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

What do the Primary Safeties ensure

A

RCS remains less than 2750 PSIA during:

  • loss of external load
  • Turbine trip
  • Loss of condenser vacuum
  • MSIV Closure
  • LOOP
  • Loss of feedwater
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

How much water volume does the PZR provide

A

Prevent PZR heaters from being uncovered during:

  • Step load decrease 25% to 15%
  • Ramp decrease 100% to 15% @5%/min
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

How is the RCS maintained subcooled?

A

Maintaining a system pressure of 2250 PSIA

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

Where does the PZR connect to the RCS

A
  • Surge Line: Loop 1 Hot leg

- Spray Valves: Loop 1 cold legs

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

How many RCS safety valves are there

A

4

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

How much of the SG tubes need to be covered to ensure RCS remains subcooled during Natural Circulation?

A

1/3 of the tubes must remain covered

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

What feature is installed to limit loss of coolant via sample lines

A

sample lines and instrumentation have flow restrictors installed to limit leakage within capacity of charging pumps and RCS press > 2200PSIA

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

How does CVCS interact with RCS

A
  • CH and LD for PLC
  • Chemistry control
  • Boron concentration
  • Collects RCS disch: drainage, bleedoff, safties
  • supplies Aux spray
  • Constant purification
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

How does NC interact with RCS

A

-Cools RCP’s: motor air cooler, Lube cooler, thrust
cooler, seal coolers
-intermediate barrier RCS to PW

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

What are the design requirements of the SG’s

A
  • transfer 3990 MWt from core to SG
  • produce 17.2x10▲6 lbm/hr
  • steam quality 99.99%
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

What will cause a RX trip?

A 
-VOPT - 110% power, 9.7% above ss power, rate change      
     of 10.6%/min
-High Log Power  - >0.01%
-High Local Power Density - >21kw/ft
-High PZR press. - >2383 psia
-Low PZR press. - <1837 psia
-Low SG press. - <960 psia
-Low SG level - <44.2% WR
-High SG level - >91% WR
-High CNTMT press. - >3 psig
-Low RX coolant flow - variable
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

What will cause a SIAS?

A
  • Low PZR press. - <1837 psia

- High CTNMT press. - >3 psig

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

What will cause a CIAS?

A
  • Low PZR press. <1837 psia

- High CTNMT press. >3 psig

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

What will cause a CSAS?

A

-Hi Hi CNTMT press. >8.5 psig

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

What will cause a MSIS?

A
  • Low SG press - <960 psia
  • High SG level - >91% WR
  • High CNTMT press. - >3 psig
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

What will cause a RAS?

A

-Low RWT level - <9.4%

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
20
Q

What will cause an AFAS lockout?

A

-SG dp >185 psia, lowest sg press is locked out

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
21
Q

What will cause an AFAS initiation?

Study These Flashcards
A

-Low SG level <25.8% WR

22
Q

What is the purpose of the SPS trip?

Study These Flashcards
A

Help assure the RCS integrity during a loss of all feedwater event with an ATWS

23
Q

What is the SPS high PZR trip set point?

24
Q

What is the purpose the RCP’s

Study These Flashcards
A
  • maintain required flow

- add heat to RCS during s/u

25
What is the Flow characteristics of the RCP's?
- Capacity - 144,000 gpm - Minimum - 111,400 gpm - Maximum - 129,225 gpm
26
How many RCP's can be run below 500°F
Limited to 3 or less RCP's
27
How many RCP's can be run below 200°F
Limited to 2 or less RCP's
28
How much charging flow is provided to each RCP for seal injection?
6.6 gpm
29
How much water is added to the CH seal injection water?
16 gpm
30
How much Seal Injection is routed down to lower journal bearing vs directed to Seals?
- 20 gpm directed to lower journal bearing | - 2.6 gpm directed towards seals
31
What is the design capacity of the RCP seals?
There are 3 seals each with a 100% design pressure drop
32
What is the interlock with seal bleed off and RCP's
Seal bleed off valves will not close if RCP is running
33
What are the 2 systems of the RCP oil system
- Main oil system | - Lift oil system
34
Describe the RCP main oil system
-Impeller attached to pump RCP shaft -lubricates Journal and Thrust bearings while RCP is running
35
Describe the RCP Lift oil system
-Consists of: Lift oil pump, reservoir, filter, and accumulator -Lubricates Thrust bearing while RCP is not running
36
Describe Lift oil pump modes of operation
-RCP secured: if Lift oil pump started will run until stopped -RCP is started: Lift oil pump auto stops after 2 MIN -When RCP stopped: Lift oil pump run until stopped
37
What are the START permissive for a RCP?
- No motor fault trips - Lift oil flow sufficient - NC flow sufficient - Bleed off vlv FULLY open
38
What is the normal position of RCP high pressure cooler isolation valves
Normally OPEN with power removed
39
What does an abnormally high or low RCP seal inlet temperature indicate?
Seal failure
40
What does RCP Bleed Off High press alarm indicate
Complete seal failure
41
What does RCP Seal Bleed Off Flow alarm indiacate
Gross Seal failure
42
What is the purpose of the PZR?
- maintain RCS subcooled - surge volume for RCS during trainsients - prevents RCS over pressurization (spray and safeties)
43
How does the PZR connect to the RCS
- Surge Line: Loop 1 Hot leg | - Spray valves: Loop 1 Cold Legs
44
What is PZR spray bypass flow
≈1.5 gpm constant flow: - maintain spray/surge line temps. - limit stratification - maintain uniform chemistry
45
Describe PZR Spray valve operation
- Varies amount of spray flow based on PZR press(auto) - mode of force is core DP - Begin opening @ 2275 psia(auto) - Fully open @ 2300 psia(auto)
46
What is the setpoint for PZR safeties?
2475 psia
47
Where do PZR safeties discharge to?
RDT
48
How are PZR safeties designed to open?
Rapid opening feature, opens valve to 70% and then fully open at 3% over pressure
49
What is used to monitor PZR Safeties
-Acoustic monitors downstream of reliefs: 0, 9, 100% indications in CR smaller increments at back panel -Temperature indicators also available
50
Describe how PZR heaters are organized
- 8 total banks - 2 proportional banks - 6 backup banks - 2 of the backup banks are class powered PGA & PGB
51
How are PZR heaters operated
- Manually on/off - Automatic: controlled by PZR press controller - Proportional always on with variable output - Backup on/off operation as needed
52
What is the power supply for PZR Safety acoustic monitors?
NNN-D11
Old System Cards
flashcards
Decks in class (34)
# Cards
Brainscape helps you reach your goals faster, through stronger study habits.
© 2026 Bold Learning Solutions. Terms and Conditions