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Area 3 > Reactor Coolant System > Flashcards

Reactor Coolant System Flashcards

1
Q

What is core bypass flow for?

A

prevent stagnant areas of water and keeps water in the head below Tsat.

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2
Q

What is our normal RCS pressure?

A

2250 PSIA

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3
Q

What is our cold leg temp?

A

557 degrees F

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4
Q

What is our hot leg temp?

A

617 degrees F

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5
Q

What is the motive force for main spray?

A

RCP’s

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6
Q

What is the Steam generator separates the primary and secondary side?

A

Tube sheet and U-tubes

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7
Q

What normally provides heat removal for the RCS system?

A

Main Steam and FW

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8
Q

Where can the primary sampling system get a sample from?

A

Loop 1 hot leg, surge line, pressurizer steam space

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9
Q

What are the three types of CEA’s?

A

Regulating, part strength, and shutdown

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10
Q

How many CEA’s are there?

A

89

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11
Q

What is the 4 spring-loaded pressurizer safety valves setpoint?

A

2750 psia

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12
Q

Why is a fuel rod pressurized with helium

A

Preclude clad collapse

Improve thermal conductivity

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13
Q

Describe the construction of a typical fuel rod

A

Slightly enriched UO2 pellet
Round wire compression spring
Spacer discs at each end of the fuel column

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14
Q

Where do the pressurizer over-pressure relief valves go to on an overpressure?

A

Reactor Drain Tank

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15
Q

What cools the RCP’s?

A

NCW

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16
Q

What does NCW cool on the RCP’s?

A
  • RCP motor air cooler
  • RCP motor lube oil cooler
  • RCP thrust bearing oil cooler
  • RCP seal coolers
17
Q

How many regulating groups are there and how are they designated?

A

five groups

1,2,3,4,5

18
Q

What components makeup a fuel assembly?

A

Fuel spacer grids, upper end fitting, hold down plate, lower end fitting, guide tubes, fuel rods

19
Q

Describe a fuel rod?

A

U02 pellets
Round wire SS compression spring with a spacer disc located at each end of the fuel column all encapsulated in a seal welded tube and pressurized with helium

20
Q

What components makeup a steam generator?

A 
Primary chamber
tube sheet and u-tubes
secondary side shell 
feedwater ring 
economizer
wrapper plate
moisture separators
steam dryers
21
Q

How is oil supplied during normal RCP operation?

A

Impeller that is keyed to the main drive shaft assy of the pump.

22
Q

Will the lift pump start in auto if the RCP trips?

A

No, the operator must start the pump. There is no auto start, only the auto stop after 2 minutes of the RCP running

23
Q

What are the three fission barriers?

A

Fuel Cladding
Reactor Coolant Boundary
Containment

24
Q

How do we regulate RCS pressure?

A

Pressurizer heaters and Main Spray
Pzr Heaters- (36 of them) Boil water to increase mass of steam in vapor space.
Main Spray- Condense steam in vapor space with subcooled water.

25
Q

How do we regulate pressurizer level?

A

PZR level control system

26
Q

Explain the main spray valves?

A
  • 100E/F
  • Start to open- 2275 psia
  • Full open - 2300 psia
27
Q

Describe the pressurizer?

A
  • Acts as a surge volume to minimize pressure changes
  • Ensures primary system integrity by preventing over pressurization
  • Maintains RCS subcooled
28
Q

How is main spray bypass flow rate controlled?

A

Bypass valves around the main spray bypass valves. Manually adjusted to achieve a flow rate to establish a delta-T between the CL and spray nozzle of the PZR of 70 degrees F.

29
Q

What does IA supply air to in the RCS system?

A
  • Pzr spray valves
  • Controlled bleedoff containment iso valves
  • Bleedoff isolation to RDT
30
Q

What are the starting permissives for a RCP?

A

No motor faults
Oil lift flow sufficient
NCW flow sufficient
RCP seal bleedoff valve fully open

31
Q

RCP automatic trips

A

Undervoltage
Coastdown
Overcurrent
Speed less then 600 RPM 14 seconds after start

32
Q

Describe the flow path of seal injection through RCP shaft seal assembly.

A
  • 6.6 gpm from CVCS enters HP piping thru jet pump
  • mixes with 16 gpm from lower journal bearing
  • 22.6 gpm flows thru HP cooler
  • Splits. 20 gpm to aux impeller thru journal bearings
  • Of that 20 gpm, 16 gpm goes back to jet pump
  • Of that 20 gpm, 4 gpm goes to the RCS
  • 2.6 of the 22.6 gpm flows thru labyrinth seals
  • 3 stages (42%/42%/16%)
  • Most flow back to VCT (of the 2.6 gpm)
  • Any leakage past vapor seal to RDT

Area 3 (6 decks)

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