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Module 2 - Instrumentation > B2101 - RPV Level Instrumentation > Flashcards

B2101 - RPV Level Instrumentation Flashcards

1
Q

What are the immediate operator actions for pressure control malfunction

A
  1. Pressure can’t be maintained < 1050 psig
  2. Throttle pressure can’t be maintained > 900 psig
  3. Control System malfunction and APRMs oscillating peak to peak > 10% rated thermal power
  4. Cooldown rate can’t be maintained < 90 deg F/Hr

Take mode switch to shutdown

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2
Q

What range does the remote shutdown panel show?

A

Wide range -160” to + 140”

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3
Q

Where can each range be read in the control room?

A
  1. Shutdown P601
  2. Upset P680
  3. Narrow P680
  4. Wide P680, P601, RSDP
  5. Fuel Zone P601
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4
Q

What are the Cal conditions for upset range?

A

CTMT 80 deg F
DW 135 deg F
Pressure 1025 psig

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5
Q

What are the cal conditions for wide range?

A 
CTMT 80 deg F
DW 135 deg F
Rx Press 1025 psig
No recirc Flow
20 BTU/lbm FW subcooling
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6
Q

what are the cal conditions for fuel zone range?

A

DW 212 deg F
Rx press 0 psig
Rx temp 212 deg F
No jet pump flow

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7
Q

what are the cal conditions for shutdown range?

A

CTMT 80 deg F
DW 80 deg F
Rx press 0 psig
Rx temp 120 deg F

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8
Q

Where are the fuel zone level taps located?

A

Jet pumps #6 and #18

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9
Q

How will level read in the fuel zone range at full jet pump flow?

A

High

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10
Q

What 2 ranges share the same reference leg?

Will it indicate in mode 5?

A

Upset and shutdown

NO

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11
Q

What is used for reference leg of the fuel zone range?

A

the variable leg of narrow range is the reference leg for fuel zone

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12
Q

What are the 9 levels of the RPV? and what happens on each level?

A
  1. 58” RFPT trip and Turbine trip
  2. 53.5” HPCS wide, RCIC narrow isolate. Rx Scram
  3. 40.7” High level alarm
  4. 38” Normal
  5. 36” Normal
  6. 32.7” Low level alarm, FCV runback if feed pump
    tripped
  7. 11.4” P - Post accident recorder to fast
    R - Recirc pumps to slow
    A - ADS lvl 3 confirmation
    N - NSSSS group 2 & 3 isolation
    S - SCRAM
    S - Setpoint setdown - <11.4”, lvl set to 54”.
    After 10s or when >12.4”, sets lvl to 4”
  8. -41.6” E - ECCS initiations - HPCS and RCIC
    D - Div III DG start
    R - Recirc pumps trip
    A - ATWS - ARI
    N - NSSSS group 6,7,8, & 10 isolation
    S - SBGT initiation signal
    S - SPMU initiation signal
    S - SBFA starts
  9. -150.3” D - Div 1/2 DG start
    E - ECCS initiations - LPCS/RHR A,B,C
    A - ADS initiation signal
    N - NSSSS group 1 & 5 isolation
    S - SPMU initiation signal
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13
Q

What are the cal conditions for narrow range?

A

CTMT 80 deg F
DW 135 deg F
Rx 1025 psig

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14
Q

What ranges have density compensation?

A

Upset and Fuel Zone (PDS and SPDS)

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15
Q

What provides back-up signal to feedwater level control?

A

Upset

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16
Q

What’s the indicator # for shutdown and upset range?

A

D002

17
Q

What’s the indicator # for Narrow and fuel zone?

A

D004

18
Q

What’s the purpose for reference leg purge?

A

Ensure condensing pots remain full of liquid during normal ops and minor transients

19
Q

What system provides reference leg purge?

A

CRD

20
Q

What is the flow rate for the reference leg purge?

A

2-6 lbm/hr from CRD

21
Q

When does RCIC initiate?

A

-41.6” WIDE range

22
Q

When does RCIC isolate?

A

53.5” NARROW range

23
Q

When does HPCS initiate?

A

-41.6” WIDE range

24
Q

When does HPCS isolate?

A

53.5” WIDE range

25
Q

What are the 5 level ranges of the RPV?

A
  1. Shutdown 0-400”
  2. Upset 0-180”
  3. Narrow 0-60”
  4. Wide -160 - +60”
  5. Fuel Zone -320 to -20”
26
Q

What’s the purpose of the condensing pot?

A

condenses steam from the Rx to water in reference leg

27
Q

What is the high pressure and low pressure sides?

A

High pressure - Reference

Low pressure - Variable

28
Q

How does wide range read in reference to narrow range?

A

15” lower than narrow range

29
Q

purpose of rpv level instrumentation?

A

monitors rpv level during normal ops, start-up, shutdown, and post-accident conditions

30
Q

explain how indicated level respond to DP changes

A

DP up - level down

DP down - level up

Module 2 - Instrumentation (12 decks)

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