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RO31 ILT > SSPS > Flashcards

SSPS Flashcards

1
Q

What does the Bistable Test Switch do?

A
  • Placing switch in “Test” or up position removes power from associated input relay and gives SSPS a trip signal**
  • Trip signal will be to both trains of SSPS
  • Used to place bi-stable in “Trip” (if it fails in its non trip direction)
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2
Q

What does the RPS Bypass Switch do (Keyed Switch)?

A
  • If switch is in bypass, you never get a trip signal ***
  • Puts power to logic bay regardless of input, allowing you to test the input drawer (using bistable test switch) without chance of causing an actuation.
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3
Q

What powers Train A Slave Relays?

A
  • CRID I (120v AC)
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4
Q

What powers Train B Slave Relays?

A
  • CRID IV (120v AC)
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5
Q

What will prevent an actuation of ESF equipment?

A
  • A loss of either CRID I or CRID IV ** (Train Specific) will prevent an ESF actuation
  • (Since Master and Slave Relays are normally de-energized, it won’t allow them to energize on a trip) **
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6
Q

Where does the SSPS General Warning come from?

A
  • Logic Bay
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7
Q

What will cause an SSPS General Warning?

A
  • Bypass Bkr Closed**
  • Output mode selector switch in test**
  • Loss of 48v DC or 15v DC
  • Input Error inhibit switch in INHIBIT
  • Multiplexer switch in INHIBIT
  • Any circuit board removed except isolation boards
  • Permissive switch out of OFF
  • Memories switch out of OFF
  • Grounded return fuse blown
  • Loss of CRID power from 1 CRID
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8
Q

A loss of which SSPS power supplies will cause a Rx trip?

A
  • Both 15v DC pwr supplies **
    OR
  • Both 48v DC pwr supply **
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9
Q

What provides power to SSPS Train A 48/15v DC?

A
  • CRID I and CRID II
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10
Q

What provides power to SSPS Train B 48/15v DC?

A
  • CRID III and CRID IV
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11
Q

How do the Trip Coils on the RTBs cause the RTB to trip?

A
  • Energize to trip ***
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12
Q

How do the UV Coils on the RTBs cause the RTB to trip?

A
  • Deenergize to Trip (48v DC) ***

- Sent from the Logic Bay

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13
Q

How do the Rx Trip switches trip the Rx?

A
  • Either Rx Trip Switches will energize both Rx Trip and Bypass Breaker Trip Coils (all 4)*
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14
Q

What does the Shunt Coil do for the RTB?

A
  • Another method to energize the trip coil (RTBs only, they are not on the Rx Trip Bypass Bkrs)
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15
Q

What will cause the RTB Trip Coils to energize? ***

A
  • Manual SI
  • Rx Trip
  • Shunt Coil (From Ctrl Sw)
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16
Q

If both Rx Trip Bypass Bkrs are closed in at the same time, what will happen?

A
  • Will cause both Rx Trip Bypass Bkrs to open **
17
Q

If you but bistable test switch to test, what happens?

A
  • Trips (actuates) bistables with the exception of CTS

- CTS bistables are bypassed*** (Energize to actuate)

18
Q

What is provided power directly from the SSPS Input Bays?

A
  • Input Bay Direct Feeds ***
19
Q

What are the Input Bay Direct Feeds?

A
  • NIs
  • Turbine Stop Valves / EHC
  • RCP Breakers
  • RCP lo volt
  • RCP lo freq
  • Manual operation Switches
20
Q

What are all other Input Bay Nondirect feeds powered by?

A
  • Protection racks **
21
Q

Is the General Warning light visible with the Logic Cabinet door closed?

A
  • Yes, it is visible on the Logic Bays **
22
Q

Which RTB and Rx Trip Bypass Bkrs are tripped by Train A SSPS?

A
  • Rx Trip Bkr A

- Rx Trip Bypass Bkr B

23
Q

Which RTB and Rx Trip Bypass Bkrs are tripped by Train B SSPS?

A
  • Rx Trip Bkr B

- Rx Trip Bypass Bkr A

24
Q

What will cause the RTBs and Rx Trip Bypass Bkrs to get an open signal?

A
  • Auto Rx Trip
  • Manual Rx Trip
  • Auto SI
  • Manual SI
  • General Warning on both Trains of SSPS
25
Q

What does the isolation amplifier do?

A
  • Ensures failure in control system does not cause the same issue in the protection system**
26
Q

Will losing 250v DC cause a Rx trip?

A
  • Yes it will
27
Q

If the Output Mode Selector Switch is taken to test, what happens?

A
  • Disables all slave relays for an entire train by
    replacing 120v AC Slave Relay power with 15v DC
  • Operated for SSPS testing
28
Q

What happens if wrong Output Mode Selector switch is operated?

A
  • General warning on both trains cause a Rx Trip
29
Q

What does the Input Error Inhibit Switch do?

A
  • Removes grounds from all input relay contacts.

- Keeps the universal logic cards from sensing a change in input.

30
Q

What does the MULTIPLEXOR DO?

A
  • Doesn’t DO anything.

- Goes to status lights , alarms, PPC

31
Q

Where does a General Warning come from?

A
  • Comes from Logic Bay
32
Q

What are the inputs to OTΔT?

A
  • RCS ΔT, Tavg, AFD (NIs), Pzr #

- Protects from DNB

33
Q

What are the inputs to OPΔT?

A
  • RCS ΔT, Tavg

- Protects from KW/ft

34
Q

What does the Input Error Inhibit Switch do?

A
  • If switch is in inhibit, ALL Rx Trips and ESFAS input trip signals are disabled
  • Trip signals can not be sent to Logic Bay
35
Q

What powers the slave relays?

A
  • 120v AC
36
Q

What’s the only ESFAS trip that cannot be reset with a trip signal still standing?

A
  • Steamline isolation

RO31 ILT (56 decks)

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