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B21 NBPI > General > Flashcards

General Flashcards

1
Q

What is the level range for Shutdown Range Level Instruments?

A

165” - 570”

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2
Q

What are the calibration conditions for Shutdown Range Level Instruments?

A

1) 120 F in the RPV
2) 0 psig
3) 90 F in the Drywell

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3
Q

What is the level range for Upset Range Level Instruments?

A

165” - 350”

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4
Q

What are the calibration conditions for the Upset Range Level Instruments?

A

1) Saturated water/steam mixture
2) 1025 psig in the RPV
3) Normal Drywell temperature

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5
Q

What is the level range for Narrow Range Level Instruments?

A

165” - 230”

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6
Q

What are the calibration conditions for the Narrow Range Level instruments?

A

1) Saturated water/steam mixture
2) 1025 psig in the RPV
3) Normal Drywell temperature

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7
Q

What is the level range for Wide Range Level Instruments?

A

5” - 230”

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8
Q

What are the calibration conditions for the Wide Range Level Instruments?

A

1) Saturated water/steam mixture
2) 1025 psig in the RPV
3) Normal Drywell temperature
4) 20 BTU/lbm subcooling
5) No Jet Pump flow

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9
Q

What is the level range for Fuel Zone Level Instruments?

A

50” - (-150”)

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10
Q

What are the calibration conditions for the Fuel Zone Level Instruments?

A

1) Saturated water/steam mixture
2) 212 F in the RPV
3) 212 F in the Drywell
4) No Jet Pump flow
5) 0 psig in the RPV

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11
Q

How many thermocouples are used to measure Reactor Vessel metal temperature?

A

There are 6 total thermocouples.

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12
Q

Where are the thermocouples located that measure Reactor Vessel metal temperature?

A

1) Two measure Vessel Top Head Flange temperature.
2) Two measure Vessel Shell Flange temperature.
3) Two measure Vessel Bottom Head Region temperature.

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13
Q

What Vessel Metal Temperature will cause an alarm on P680?

A

Any Vessel metal temperature less than 85F will alarm on P680. The concern is excessive cooldown and brittle fracture.

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14
Q

What type of level detector is used to measure Reactor Pressure Vessel level?

A

Differential pressure detectors are used to indicate Vessel level by measuring level in the Downcomer.

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15
Q

Where does the Reference leg of the Differential Pressure level detector tap into the Reactor Vessel?

A

The Reference Leg taps into the RPV steam volume through a Condensing Pot.

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16
Q

What type of temperature compensation do our level instruments use?

A

NONE, that is why there are five ranges of level instruments.

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17
Q

Where does the Variable leg of the Differential Pressure level detector tap into the Reactor Vessel?

A

The Variable Leg taps into the Downcomer.

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18
Q

What system provides the water for the Reference Leg Purge?

A

Control Rod Drive Hydraulics

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19
Q

Do all of the Level Ranges use Reference Leg Purge?

A

Shutdown and Upset don’t use Reference Leg Purge, but all other ranges do.

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20
Q

What is the level offset between the Downcomer and actual Vessel level inside the Core Shroud? What causes this phenomenon?

A

The level offset between the Downcomer and the Core Shroud is approximately 5 inches at 100% power. This occurs due to the higher pressure inside the Core Shroud caused by the two phase boiling resistance to flow.

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21
Q

What signals are provided by Narrow Range Level 3(178”)?

A

1) ADS Confirmation
2) RPS Low Level Scram
3) B33 Downshift
4) NS4 RHR Isolation
5) Setpoint Setdown

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22
Q

What signals are provided by Narrow Range Level 4(197”)?

A

1) Low Level Alarm

2) B33 FCV Runback

23
Q

What signals are provided by Narrow Range Level 7(205”)?

A

High Level Alarm

24
Q

What signals are provided by Narrow Range Level 8(219”)?

A

1) RCIC Injection Valve Closure
2) RPS Scram
3) Turbine Trips

25
Q

What signals are provided by Wide Range Level 1(16.5”)?

A

1) LPCS/LPCI Start
2) Division 1 & Division 2 Diesel Generator Start
3) ADS Initiation
4) AEGTS Start
5) MSIV Auto Closure
6) Level 1 Isolation

26
Q

What signals are provided by Wide Range Level 2(130”)?

A

1) HPCS/RCIC Initiation
2) NS4 BOP Isolation
3) RRCS B33 Pump Trip
4) Division 3 Diesel Generator Start
5) G33 Isolation

27
Q

What signals are provided by Wide Range Level 8(219”)?

A

1) E51-F045 Closure

2) E22-F004 Closure

28
Q

What is the basis for the Level 8 Main Turbine Trip?

A

1) Prevent damage from carryover

2) RFPT

29
Q

What functions occur at Level 8(219”)?

A

1) Reactor Scram 2) Main Turbine trips 3) Reactor Feed Pump Turbines trip 4) Motor Feed Pump trips 5) HPCS Injection Valve, E22-F004, closes 6) RCIC Steam Isolation valve, E51-F045, closes

30
Q

What function occurs at Level 7(205”)?

A

High level alarm

31
Q

What function occurs at Level 5(201”)?

A

Normal operating band prevents Carryover and Carryunder.

32
Q

What functions occur at Level 4(197”)?

A

1) Low level alarm 2) Reactor Recirc FCV runback coincident with a RFPT trip to 17% valve position equal to 48 % Core Flow.

33
Q

What functions occur at Level 3(178”)?

A

1) Reactor Scram 2) Reactor Recirc Pumps shift to slow speed 3) RHR Shutdown Cooling isolates(NS4) 4) ADS confirmatory signal 5) Setpoint Setdown activated

34
Q

What functions occur at Level 2(130”)?

A

1) HPCS starts 2) RCIC starts 3) Division 3 Diesel starts 4) NS4 BOP Isolation 5) Reactor Recirc Pumps trip off 6) RWCU isolates

35
Q

What is the basis for the Level 8 Reactor Scram? What instrument range is utilized?

A

1) Stop positive reactivity addition to the Reactor 2) Narrow Range

36
Q

What is the basis for the Level 8 Main Turbine Trip? What instrument range is utilized?

A

1) Avoid carryover and damage to the Main Turbine 2) Narrow Range

37
Q

What is the basis for the Level 8 Reactor Feed Pump Turbine and Motor Feed Pump trip? What instrument range is utilized?

A

1) Avoid overfeeding the vessel 2) Narrow Range

38
Q

What is the basis for the Level 8 closure of the HPCS Injection Valve, E22-F004? What instrument range is utilized?

A

1) Avoid overfeeding the vessel 2) Wide Range

39
Q

What is the basis for the Level 8 closure of the RCIC Steam Isolation Valve, E51-F045? What instrument range is utilized?

A

1) Avoid overfeeding the vessel 2) Wide Range

40
Q

What is the basis for the Level 7 annunciator? What instrument range is utilized?

A

1) Alert the operator of a problem 2) Narrow Range

41
Q

What is the basis for the Level 5 normal operating band? What instrument range is utilized?

A

1) The normal operating band prevents carryover/carryunder 2) The normal band provides adequate NPSH for the Reactor Recirc Pumps 3) Narrow Range

42
Q

What is the basis for the Level 4 annunciator? What instrument range is utilized?

A

1) Alerts the operator of a problem 2) Narrow Range

43
Q

What is the basis for the Level 4 Reactor Recirc Flow Control Valve Runback concurrent with a RFPT trip? What instrument range is utilized?

A

1) Reduce reactor power to allow the running RFPT to handle the feed demand 2) Narrow Range

44
Q

What is the basis for the Level 3 Reactor Scram? What instrument range is utilized?

A

1) Avoid carryunder 2) Narrow Range

45
Q

What is the basis for the Level 3 Reactor Recirc Pump Downshift? What instrument range is utilized?

A

1) Low NPSH for the Reactor Recirc Pumps 2) Narrow Range

46
Q

What is the basis for the Level 3 RHR Shutdown Cooling Isolation? What instrument range is utilized?

A

1) Isolates possible source of leakage 2) Narrow Range

47
Q

What is the basis for the Level 3 ADS confirmatory signal? What instrument range is utilized?

A

1) Allows Level 1 signal to actuate ADS 2) Narrow Range

48
Q

What is the basis for the Level 3 Setpoint Setdown activation? What instrument range is utilized?

A

1) Setpoint Setdown activates at Level 3 to lower the level setpoint to prevent overfeeding the vessel reestablishing level 2) Narrow Range

49
Q

What is the basis for the Level 2 HPCS and RCIC initiation? What instrument range is utilized?

A

1) Recover vessel inventory prior to Level 1 2) Wide Range

50
Q

What is the basis for the Level 3 Division 3 Diesel Generator start? What instrument range is utilized?

A

1) Division 3 Diesel is started in preparation for loading the bus 2) Wide Range

51
Q

What is the basis for the Level 2 NS4 BOP isolation? What instrument range is utilized?

A

1) Anticipates a possible LOCA 2) Wide Range

52
Q

What is the basis for the Level 2 trip of Reactor Recirc pumps? What instrument range is utilized?

A

1) Inserts negative reactivity for an ATWS 2) Wide Range

53
Q

What is the basis for the Level 2 isolation of RWCU? What instrument range is utilized?

A

1) Isolates a possible source of leakage 2) Wide Range

B21 NBPI (2 decks)

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