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ANO1 ILO 2022 > NNI > Flashcards

NNI Flashcards

1
Q

NNI system function

A

Provides alarms, indications, and control signals for system variable such as temp, press, flow, and level.

Encompasses all instrumentation other than Nuclear Instrumentation.

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2
Q

discuss a Type A variable

A

provides info req’d to allow operators to take manual actions for which no auto control is provided AND
are req’d for a safety system to do its safety function

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3
Q

Discuss Type B Variable

A

provide info to indicate whether plant safety functions are being accomplished such as:

  • reactivity control
  • core cooling
  • maintain RCS integrity
  • maintain containment integrity
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4
Q

Discuss Type C Variable

A

Provide info to indicate potential for breach of barriers to fission product release.

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5
Q

Discuss Type D variables

A

provide info to indicate the operations of ind. safety systems

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6
Q

Discuss Type E variables

A

provide info req’d to determine the magnitude of the release of radioactive materials and for continuously assessing such releases

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7
Q

Which variables are category 1? the most stringent cat.

A

A, B, & C

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8
Q

Which variables fall into category 2?

A

Type D & E

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9
Q

Which variables fall into category 3?

A

all backup variables fall into this cat.

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10
Q

What is a key variable?

A

single variable that most directly indicates the accomplishment of a safety function or indication of radioactive release

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11
Q

What is a backup variable?

A

additional variables to provide info to backup the key variables and allow diagnosis

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12
Q

NNI X is powered from ____.

NNI Y is powered from ____.

A

RS-1 or Y-02

RS-4 or Y-01

each channel has normal seeking ABT

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13
Q

Power supply monitor will trip the S-1 and S-2 switches when any DC power is lost for ____ seconds.

A

> 0.5 seconds

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14
Q

Smart Automatic Signal Selector (SASS) System does what?

A

SASS transfers to a redundant input when a rapid signal failure is detected.

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15
Q

Placing the mismatch alarm bypass switch to ON has ___ effect on auto transfer capabilities.

A

no effect

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16
Q

Ranges for RCS hot leg instruments and systems that use them.

A

3 dual element RTDs on each hot leg

Narrow range (520F-620F) -> remote shutdown, SASS, RCS Flow, Plant Computer

Wide Range (50-700F) -> SPDS

17
Q

What does green dot (snake eyes) on a gauge mean?

A

This denotes a Reg Guide 1.97 instrument.
This instrumentation is acceptable to NRC for complying with regulations to provide instrumentation to monitor plant variables following an accident.

18
Q

Ranges for RCS cold leg instruments and systems that use them.

A 
Wide rang (50-700F) -> dasey panel and SPDS
--also inputs to RCP I/L for 4th pump >465F

Narrow Range (520-620) -> Tave, Tdelta, cold leg Tdelta

19
Q

Tave calculation and NNIs

A

NNI X calculates Loop ‘A’ average temp
NNI Y calculates Loop ‘B’ average temp

Unit Tave is calculated from the average Thot and Tcold signals

20
Q

Tave, RCS Flow: which loop controls and when

A

Normally Unit Tave is in control

EITHER loop flow <95%, opposite loop auto selected for Tave control

BOTH loops <95% flow = either may be selected for Tave control

21
Q

How is deltaT cold calculated?

A

Loop ‘A’ cold leg temp - Loop ‘B’ cold leg temp

Range is +-10F

22
Q

How many RCS pressure instruments and where?

A
  • 10 pressure transmitters
  • Located on instrument racks 1 and 2 inside RB
  • Tap into the hot legs on vertical piping leading to OTSGs
23
Q

How many RCS pressure instruments feed into what.

A
  • 4 supply the 4 RPS channels
  • 3 supply the 3 ES channels
  • 2 supply EFIC
24
Q

Alarms for PZR hihi lolo and cv-1235 are on what paneL.

A

dasey panel

25
Q

Interaction with RPS

A

RPS sense flow for input to the flux/delta flux/flow trip

RPS channel ‘A’ supplies Loop A/B flow to NNIX

RPS ‘B’ supplies RCS loop A/B flow to NNI Y

26
Q

Purpose of ICCMDS (inadequate Core Cooling Monitor and Display System)

A
  • advance warning and annunciation of approach to ICC
  • tracking coolant inventory
  • CET indication
  • RCS level
  • SCM calculation
  • RV head fluid temp and level
27
Q

what constitutes operability for hot leg level sensors?

A

1 wide range

2 narrow range

28
Q

Each channel of ICCMDS uses what to calculate subcooling margin?

A

RCS pressure input AND

the average CET temp

29
Q

Core Exit Thermocouples Tech Spec requirements

A

2 CET per core quadrant to be operable

30
Q

4 modes of ICCMDS

A
  • Maintenance = applicable train is considered inop
  • Normal
  • Shutdown = operator can adjust setpoints and disable points
  • Refueling = used when reactor head is to be removed
31
Q

what is the purpose of current buffer in the NNI system?

A

converts signal to usable range.

ANO1 ILO 2022 (12 decks)

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