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Advanced Systems > TMM > Flashcards

TMM Flashcards

1
Q

LCO 3.2.4 “Axial Shape Index” requirement

A

The ASI shall be within the limits specified in the COLR

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2
Q

LCO 3.2.4 “Axial Shape Index” applicability

A

Mode 1 with thermal power > 25% RTP

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3
Q

LCO 3.3.1 “RPS Instrumentation” requirement for TMMs

A

4 RPS trip units, associated instrument channels, and associated ZPM Bypass removal channels for VHPT and TM/LP shall be operable

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4
Q

LCO 3.3.1 “RPS Instrumentation” applicability for TMMs

A

Modes 1-2
Modes 3-5 with more than 1 full length control rod capable of being withdrawn and PCS boron concentration less than refueling boron concentration

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5
Q

LCO 3.4.1 “PCS Pressure, Temperature, and Flow DNB Limits” requirement

A

PCS DNB parameters for PZR pressure, cold leg temperature, and PCS total flow rate shall be within limits specified in the COLR

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6
Q

LCO 3.4.1 “PCS Pressure, Temperature, and Flow DNB Limits” applicability

A

Mode 1

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7
Q

What are the power supplies for the TMMs?

A

Y-10/20/30/40 for channel A/B/C/D respectively

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8
Q

What are the inputs into the TMMs?

A
  • 2 Tcold
  • 2 Thot
  • Power Range NI Upper
  • Power Range NI Lower
  • Power Range NI Upper + Lower
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9
Q

What are the outputs from the TMMs?

A
  • VHPT trip and alarm
  • TM/LP trip and alarm
  • NI/Delta-T Power deviation
  • ASI alarm
  • Comparator alarm
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10
Q

How is the ASI alarm generated?

A
  • The first signal is generated from the Excore NI upper and lower inputs to generate ASI signal
  • ASI signal is sent to ASI Function that uses Incores to correct the ASI signal for bleed over and outputs and axial offset signal
  • The second signal is generated from the higher of NI Power or Delta-T power, which is sent through the LOCA Peaking Function
  • The output of the LOCA Peaking Function is sent to the Local Power Density Function, which generates the ASI alarm setpoint for the sensed reactor power
  • These 2 signals are sent to the ASI alarm comparator, and if the axial offset signal exceeds alarm setpoint, then ASI alarm comes in
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11
Q

How is the TM/LP Trip and Alarm generated?

A
  • The first signal is the Tcal signal, which is generated by using the higher of the 2 Tcold inputs, which is converted to a Tcal signal
  • The second signal is the power penalty (Qdnb), which is generated by multiplying the axial function (axial offset) and the power peaking function (generated using the higher of NI power and Delta-T power)
  • Tcal and Qdnb are then summed to output Pvar
  • A comparator then takes the larger of either Pvar or 1760 psia and outputs Ptrip, which is the TM/LP trip setpoint
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12
Q

What is the TM/LP pre-trip setpoint?

A

Approximately 50 psi above the trip setpoint

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13
Q

How is the VHPT trip and alarm generated?

A
  • Max of NI power and Delta-T power inputs into VHP function
  • Output of VHP function is input into a comparator, where it is compared to a pre-set value.
  • If it is larger than the pre-set value, a signal is sent to trip the reactor, or provide the pre-trip alarm
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14
Q

What are the minimum, maximum, and normal VHPT setpoints?

A
  • Minimum - 30% power
  • Maximum - 106.5% power
  • Normal - 15% above reset power level
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15
Q

What are the minimum, maximum, and normal VHP pre-trip setpoints?

A
  • Minimum - 28.5%
  • Maximum - 105%
  • Normal - 13.5% above reset power level
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16
Q

How are the VHP trip/pre-trip setpoints changed?

A
  • Setpoints auto change when power decreases
  • Setpoints need to be manually changed when power increases by pushing the “VHP Trip Reset” button on C-02 or from the TMM itself
17
Q

What are the requirements to reset the VHP trip/pre-trip setpoints?

A
  • Reactor power hasn’t changed more than 0.5% for 10 minutes following a transient
  • Control rods are withdrawn above PDIL
  • PZR pressure within 2010-2100 psia, controlled, and approaching NOP of 2060 psia
  • PZR level within 40%-60%
  • Both S/G levels between 60%-70%
  • Tave within 3% of Tref
18
Q

What are the Tcold setpoints for the “Calculator Trouble” alarm?

A

Tcold-max > 543.5 F or < 525 F

19
Q

How is Delta-T power calculated?

A

Delta T between the highest of the 2 Tcolds and the average of the 2 Thots

20
Q

How is NI power calculated?

A

Upper + Lower from the excore

21
Q

What causes “NI/Delta-T Deviation” alarm?

A

Deviation between NI Power and Delta-T Power > 3% for > 18 seconds

22
Q

How do we respond to “NI/Delta-T Deviation” alarm?

A

If alarm is in, and power will be stable for >= 1 hour, then perform a heat balance and calibrate power range/Delta-T power

Advanced Systems (36 decks)

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