Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

Weeks 1 & 2 Systems > Reactor Coolant System > Flashcards

Reactor Coolant System Flashcards

1
Q

What are the pressurizer level alarms?

A

Lo Lo: 55”

Lo: 200”

Hi: 240”

Hi HI: 275”

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

How much level change in the pressurizer is there for every 1 degree change?

A

5” pzr level

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

What are the relief setpoints for the ERV and PZR code safeties? When will the ERV close?

A

Code safeties: 2500#

ERV: Open @ 2450# and close @ 2395#

LTOP: opens @ 400#, closes @ 350#

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

What is the minimum pressurizer level requirement when pzr heaters are capable of being energized?

A

70”

Source: 1103.005 limits & precautions

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

What are the requirements for natural circulation?

A

1) Heat sink/source elevation difference
2) Hydraulic coupling
3) density change
4) steam release path

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

What are the 4 steam generator level instruments?

A

1) SU Range (0 - 250”)
2) Operate Range (102 - 394” indicated 0-100%)
3) Full range (272 - 861”)
4) EFIC Hi/Lo range (Lo 6 - 156”, Hi 102 - 500”)

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

What is the high pressure alarm and rupture disk setpoint for the quench tank?

A

Hi alarm: 90# Rupture disk: 100#

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

What is the purpose of maintaining water level in the quench tank and what are the level requirements?

A

Purpose: Provides sufficient quench cooling volume for pressurizer transients Level is maintained between 4000 and 8300 gallons Procedurally maintained 5100 - 8212 gallons (Hi Alarm)

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

What is the minimum required N2 pressure for the quench tank and why is this maintained?

A

Minimum pressure is 1 psig to prevent collapsing the tank.

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

What instrumentation is provided on the hot leg and what order?

A

Flow (gentile tube), Temperature, Pressure

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

What do the indications for ERV on C04 mean?

A

White light: indicates HS in ICS relay room is in auto

Red light: indicates solenoid is energized

Position indication: generated from acoustic monitor

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

What is required if a loss of seal cooling and seal injection occurs and what is the time constraint?

A

If unable to restore within 2 minutes, RCP operation shall be secured and seal isolated.

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

What would occur if A RCP seal bleedoff flow path were to be isolated?

A

Loss of seal staging with no flow through the seal could result in seal damage

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

What is the purpose of the RCP flywheels?

A

Increases the rotational inertia which prolongs the pump coast assuring flow to the core for as long as possible following loss of power.

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

Describe the RCP seal leak collection system?

A

Leakage past the 3rd seal collects in the drinking bird. Once drinking bird fills it dumps to the T-111 (40 gallon tank). A timer counts the time taken to fill T-111 and once filled will pump to the quench tank.

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

What parameters are indicative of steam bubble formation?

A

< 1# quench tank pressure change for 3 minute ERV blowdown and saturation conditions in the PZR.

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

What are the 7 locations for Vibration loose parts monitor?

A

2 on each SG, 2 on bottom of RV, 1 on top of RV

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

What are the TS requirements for pzr heaters?

A

TS 3.4.9 requires 2 trains of heaters with 126 KW available (modes 1-4 > 259 degrees) in the loss of offsite power concurrent with single failure of 1 EDG. To meet this Bank 1 & group 5 (red train) and Bank 2 proportional heaters and group 5 vital powered heaters (green train) are required. (If group 5 are declared inoperable, then both trains of pzr heaters are considered inoperable).

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

Why is CV-1009 (PZR spray isolation) required to be closed when using Aux Spray?

A

Due to thermal stress concerns on normal spray line due to lack of thermal sleeving on the normal spray line from RCS because spray flow would backflow to cold leg penetration.

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

What is the delta T limits for pressurizer fluid temp to pressurizer temperature?

A

TRM 3.4.3 requires delta T < 430 degrees F.

21
Q

What is the pressurizer cooldown rate limits?

A

TRM 3.4.3 requires pressurizer heatup and cooldown rate < 100 degrees/hr

22
Q

What is the max RCP seal cooler flow and what is it based on?

A

2.5 gpm - if exceeded can lead to overheating of seal due to exceeding max capacity of cooler.

23
Q

What is the purpose of the backstop lube oil system?

A

Lubricate the anti-reverse rotation device during pump S/U & S/D

24
Q

What are the purposes of bypass flow around the pzr spray valve?

A

1 gpm flow minimizes surge and spray line temperature differentials and maintain pressurizer boron concentration equalized

25
Q

What are the RCS cooldown limits per TS 3.4.3?

A

TS limits: >/= 280 F - rate is 100F/hr

280 F > T >/= 150 F - rate is 50F/hr

T < 150 F - rate is 25F/hr

Admin limit: 50 degress F/hr when temperature > 280 F

26
Q

What is the maximum pressurizer level per TS?

A

TS 3.4.9 requires pressurizer < 320”.

27
Q

What is required if one pzr safety valve becomes inoperable?

A

Per TS 3.4.10 if one safety valve becomes inoperable, then restore within 15 min or be in mode 3 in 6 hours.

28
Q

What pzr level are the pzr heaters interlocked off?

A

55”

29
Q

What are the setpoints for the pressurizer spray valve?

A

Normal: opens @ 2205 psig closes @ 2155 psig

MFP Trip > 80% opens @ 2080 psig closes @ 2030 psig

30
Q

How many total Reactor Vessel penetrations are there?

A

CRD/RVL monitor - 69

Incore - 52

DH/CFT nozzles - 2

Cold legs - 4

Hot legs - 2

31
Q

What are the RCP start interlocks?

A

1) RCP seal injection > 3 gpm
2) RCP motor cooling flow > 250 gpm
3) RCP Seal cooling flow > 30 gpm
4) A/C/D upper and lower motor bearing oil levels sat
5) A/C/D HP lift oil pressure > 1750#
6) No RCP reverse rotation (< 12.7 gpm oil flow)
7) RCS to SG downcomer delta T < 50 F for first RCP
8) Tcold > 241 F for 3rd pump
9) Tcold> 465 F for 4th pump
10) Power < 22%

32
Q

What are the heat transfer regions in the steam generator? What happens to these regions as power increases?

A

Preheat - occurs in the downcomer as feedwater is preheated nucleate boiling - best heat transfer occurs

Film boiling - heat transfer decreases as film builds up on tubes

Superheat - Additional heat above saturation temperature

As power rises, nucleate boiling region gets larger, film boiling is constant and superheat region gets smaller

33
Q

Where does the PZR tap into RCS? DH suction/discharge? Makeup line? Letdown?

A

PZR and DH suction come off A Hot leg, DH discharge into the reactor vessel, makeup line taps into D RCP discharge. Letdown comes off A RCP suction line.

34
Q

Where else can the ERV isolation be operated from?

A

Locally at breaker (B-61)

35
Q

What function does the thrust runner pump provide?

A

Thrust runner pump provides oil to the thrust bearing and ARD when RCP is running

36
Q

What occurs with the RCP oil pumps when breaker is opened or pump is stopped?

A

The oil pumps will start when breaker is opened unless they are in PTL.

37
Q

What would the upper and lower RCP seal cavity read if the first stage were to fail? 2nd stage? 3rd stage?

A

1st stage - lower cavity would read RCS pressure and upper cavity would read half of that (~1100#)

2nd stage - upper and lower cavity pressure would be ~ 1000#

3rd stage - upper cavity pressure would be close to makeup tank pressure and lower cavity would be around 1000#

38
Q

What pressure will the heater banks cycle on and back off?

A

Proportional - maintain 2155# proportionally/integrally

Bank 3 - On @ 2135#, off at 2155#

Bank 4 - On @ 2120#, off at 2140#

Bank 5 - On @ 2105#, off at 2125#

39
Q

What pressurizer level would require the reactor to be tripped?

A

290” requires a manual rx trip

40
Q

What are the RCS leakage thresholds per TS 3.4.13?

A

Pressure boundary - None

Unidentified - 1 gpm

Identified - 10 gpm

SG Tube Leakage - 150 gpd in 1 SG

Applicable in modes 1 - 4

41
Q

How much bypass is there through the core and what is its purpose?

A

5-6% to provide extra cooling to stagnant areas.

42
Q

What is the design criteria for pressure and temperature associated with the reactor vessel?

A

Temperature: 650 degrees F Pressure: 2500#

43
Q

Draw the RCS pressure V.

A
44
Q

What is the minimum PZR level when power is greater than 15%

A

190”

Reference: 1103.005 limits & precautions

45
Q

Why is one RCP in operation limited?

A

The 2nd RCP is started within 2 minutes of the first due to potential damage to the hydrostatic bearing due to low flow

46
Q

What is the maximum allowable seal injection temperature?

A

165 degrees F

Reference: 1103.006 limits & precautions

47
Q

What is the minimum temperature for criticality per TS 3.4.2 and what actions are required?

A

Minimum temperature is 525 degrees F

Be in mode 3 in 30 min.

48
Q

How long can 1 RCP be secured in modes 1 and 2 per TS 3.4.4?

A

18 hours

Weeks 1 & 2 Systems (6 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions