C11 - CRD Flashcards

1
Q

How much flow maintained in the CRD flow control station?

A

60 gpm

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

How much flow is allowed through the flow control valve in the closed position due to mechanical stop?

A

5 gpm

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

How does flow control valve react to changes in flow?

A

> 60 gpm valve closed

< 60 gpm valve opens

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

What powers ARI?

A

E and K

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

What powers the SCRAM valves?

A

RPS A and B

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

Where are the CRD pumps controlled from?

A

601 panel and remote shutdown panels

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

What’s the CRD pump trips?

A

> 6.4” Hg low suction pressure (approx 20’ in the CST)

< 3.0 low oil pressure

ESF load shed

MPD

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

What’s the purpose of the pressure control valve?

A

maintain drive water pressure 250 psig above Rx pressure

Maintain cooling water pressure < 20 psig about Rx pressure

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

What can high cooling water pressure cause?

A

Control rod drive

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

What will excessive drive water pressure cause?

A

internal damage to CRD drive mechanism

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

When does Aux oil pumps start for CRD?

A

3-5 psig AND pump breaker open

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

When does Aux oil pump trip?

A

10 psig

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

What’s the purpose of equalizing valves?

A

Prevents large DP on CRD piston

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

What does the SCRAM air header supply?

A

Air to SCRAM valves and SCRAM discharge volume (SDV) vent and drain valves, vents air on SCRAM signal

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

What pressures are HCUs charged to?

A

1250 psig water

1775 psig water/nitrogen

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

What’s the purpose of SCRAM discharge volume (SDV)?

A

collects water from CRD mechs during SCRAM. it’s normally empty (drains to suppression pool)

17
Q

how many stab valves close to insert and withdraw a control ROD?

A

Insert - 2 valves close

withdraw - 2 valves close at first (to lift off collet fingers) then 1 valve for withdraw

18
Q

How much flow is required for the process of inserting and withdrawing a control rod (stab valves)

A

Insert 5.2 gpm

withdraw 4.2 gpm

19
Q

What is the tech spec time for inserting a control rod?

A

7 seconds

20
Q

when does the alarm come in for HCU pressure?

A

1600 psig

21
Q

What is the tech spec limit for HCU pressure?

A

1520 psig

22
Q

What is the alarm, rod block, and SCRAM setpoints for SDV?

A

Alarm 2.5” 3 gallons

Rod block 32” 13 gallons

SCRAM 64” 26 gallons

23
Q

What’s the purpose of collet fingers?

A

prevents rod drift, prevents rod from moving downward, allows for incremental adjustments

24
Q

What’s the purpose of the ball-check valve in CRD system?

A

Allows Rx pressure to SCRAM Rx with loss of CRD pressure used in HCU failure

25
Q

What’s the purpose of the velocity limiter?

A

Reduced fall rate to 5 ft/s in Rod drop accident to protect fuel (excessive reactivity)

26
Q

What’s the coupling spud?

A

connects rod to mech

27
Q

What slows down the rod after a SCRAM?

A

Buffer piston

28
Q

What happens if under piston line breaks?

A

Nothing (Collet fingers hold it in place)

29
Q

What happens if over piston (P-over) ruptures?

A

Rod inserts with cooling water (control rod drift)