ATS Flashcards

1
Q

What is the purpose of ATS?

A

To take information from various transmitters and to provide interlocks and protective features and trips for various systems and provide control room indication for those systems

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2
Q

That does the information from ATS help to prevent?

A

Vessel Overpressure

Prevent uncovering core and flodding separators

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3
Q

What will cause the ATS Gross Failure light to come on?

A

When transmitters are de-energized or disconnected.
Power Lost
Card Removed

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4
Q

What are teh minimum components for an ATS Module?

A

Power supply
Master Trip Unit
Transmitter
Master Trip Relay

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5
Q

What does it mean when an ATS Trip Relay is “Normal”? Reverse?

A

Normal Means relay is energized when parameter is above teh setpoint
Reverse means that relay is energized when parameter is below the setpoint

IE: For -59” RPS Relay - it is normally energized and kept above the low setpoint - when it drops below the -59” level the relay drops out and actuates

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6
Q

What are teh conditions of the ATS trip lights when the Trip Switch is in Normal? Reverse?

A

Normal means the light is on when the relay is energized

Reverse means the light is on when relay is de-energized (unless loss of power).

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7
Q

For ATS what is meant by “Normal-Normal”?

A

Normal Trip Relay and Normal Trip Light OR

Relay Energized above Setpoint and Light on when relay energized

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8
Q

What is the basic logic flowpath for ATS?

A

Output of XT (transmitter) is set to MTU which drives one MTR (Master Trip Relay) and provides signal through an isolator/converter for the MCR indication

In some cases the MTU provides signal to a Slave Trip Unit (STU) which drives one or more slave trip relay

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9
Q

What happens to ATS Division instruments if the division power source is lost?

A

Atleast some of the instruments are de-energized and signal lost. May cause divisional trips

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10
Q

What are the power sources for the ATS System?

A

Div I: AC from MCC28-1 120VAC Dist Pnl
DC from 125vdc 2A-1 (Same scheme for U3)
Div II: AC from MCC29-1 120VAC Dist Pnl
DC from 125 vdc 2B-1 (Same scheme for U3)q

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10
Q

What are the power sources for the ATS System?

A

Div I: AC from MCC28-1 120VAC Dist Pnl
DC from 125vdc 2A-1 (Same scheme for U3)
Div II: AC from MCC29-1 120VAC Dist Pnl
DC from 125 vdc 2B-1 (Same scheme for U3)q

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11
Q

What happens with loss of all ATS AC power?

A

Lose all control room level indication except narrow range because it is backed up by ESS 250vdc

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12
Q

Which ATS Trip Units have meters?

A

Master Trip Units

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13
Q

What is the Purpose of the ATS Isolator?

A

Prevents an issue from a potentially NS MCR component from affecting the SR ATS components

ALSO converts voltage to current to prevent line losses

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14
Q

What signals cause the ATS Trouble Alarm?

A

Gross Failure
Card Out
Power Failure
Card in Test

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15
Q

What is the power voltage to the ATS System?

A

24VDC - supplied by 120vac to the ATS power supply

16
Q

What does the ATS look like with a loss of power?

A

The local panel has all METERS DOWNSCALE AND LIGHTS OUT

17
Q

What are teh major trips tied to ATS?

A
RPS Hi Pressure and Lo Level Scram
PCIS Grp 1,2, & 3 Initiation
RR Pp Rx Lo Lvl Trip (NPSH)
HPCI Isolation
SBGT Start opposite train and heater on low flow
Torus to RB Vacuum Breaker