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RO34 - Revised and Upgraded Decks > SSPS > Flashcards

SSPS Flashcards

1
Q

What does the Bistable Test Switch in test do?

A
  • Gives SSPS a trip signal for both trains
  • 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 in bypass do?

A
  • Prevents getting 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.

(keyed switch)

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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 power failure will prevent an actuation of ESF equipment?

A
  • A loss of either CRID I or CRID IV (Train Specific) will prevent an ESF actuation
  • (Master and Slave Relays are normally de-energized. Loss of a supplying CRID won’t allow the SLAVE Relays to energize on a trip)
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6
Q

Where does the SSPS General Warning come from?

A

Logic Cabinets

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7
Q

What will cause an SSPS General Warning?

A
  • Bypass Bkr Closed
  • Output mode selector switch in test
    As well as:
  • Loss of 48v DC or 15v DC (CRID lost)
  • 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
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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

How do the Trip Coils on the RTBs cause the Reactor Trip Breakers to trip?

A

Energize to trip

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10
Q

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

A

Deenergize to Trip (loss of 48v DC)

does NOT need control power

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11
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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12
Q

What does the Shunt Coil do for the RTB?

A

Energizes the trip coil
(RTBs only, they are not on the Rx Trip Bypass Bkrs)

uses control power

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13
Q

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

A

Trips both Bypass Breakers

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14
Q

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

A

Trips (actuates) bistables with the exception of CTS

(CTS bistables are bypassed. They are energize to actuate)

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15
Q

What is provided power directly from the SSPS Input Bays?

A

Input Bay Direct Feeds

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16
Q

What are the Input Bay Nondirect feeds powered by?

A

Protection racks

17
Q

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

A

Yes, it is visible on the Logic Bays

18
Q

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

A
  • Rx Trip Bkr A
  • Rx Trip Bypass Bkr B
19
Q

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

A
  • Rx Trip Bkr B
  • Rx Trip Bypass Bkr A
20
Q

What will happen if you get a General Warning on Both Trains of SSPS?

A

Reactor will trip

21
Q

What does the Isolation Amplifier do?

A

Ensures failure in control system does not cause the same issue in the protection system

22
Q

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

A

Disables all slave relays for an entire train
(by replacing 120 vAC power with 15 vDC)

23
Q

What does the Input Error Inhibit Switch do?

A

Keeps logic cards from sensing a change in input. The signals will NEVER get to the logic cabinet, which allows testing.

SI Switch for that Train WILL work

24
Q

What does the MULTIPLEXOR DO?

A

Only goes to status lights, alarms, PPC

25
Q

What are the inputs to OTΔT? What does it protect from?

A

RCS ΔT, Tavg, AFD and Pzr Pressure
(Protects from DNB)

26
Q

What are the inputs to OPΔT? What does it protect from?

A

RCS ΔT and Tavg
(Protects from KW/ft)

No P in OPΔT!!!

27
Q

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

A

Steamline Isolation

28
Q

What is the high level flowpath for SSPS from a signal in the field to the pump and valve actuations?

A
29
Q

If CRID 1 is lost, what is the significance for SSPS?

A

Train A Slave Relays are lost, so auto actuations for that train won’t work. Train A SI Switches will NOT work. Pumps and valves can be aligned manually

30
Q

If CRID 4 is lost, what is the significance for SSPS?

A

Train B Slave Relays are lost, so automatic ESF actuations won’t happen. Train B SI switches will NOT work. Pumps and valves would have to be aligned manually

31
Q

The following conditions exist:
- Containment pressure instrument Channel #1, 2-PPP-303 (PT-937) declared inoperable.
- Required actions per 2-OHP-4022-013-011 Containment Instrumentation Malfunction have been completed.
- Required Technical Specification Actions have been taken for Channel #1, 2-PPP-303 (PT-937)

What is the REMAINING coincidence for the SAFETY INJECTION ACTUATION and CTS ACTUATION?

A

SI = 2/3
CTS= 2/3

(The CTS Actuation Bistable is placed in the BYPASSED condition to prevent inadvertent actuation. This changes the remaining channel coincidence to 2/3 instead of the previous 2/4. Only 3 channels (Channels 2, 3, & 4) feed the SI Actuation This channel does NOT feed SI so the SI coincidence remains at 2/3)

32
Q

Given the following plant conditions:
- Unit 2 is at 100% power
- Containment pressure instrument Channel #3, 2-PPP-301, declared inoperable
- Required actions per 2-OHP-4022-013-011 CONTAINMENT INSTRUMENTATION MALFUNCTION have been completed
CRID 2 has just lost power.

Explain the impact on the Safety Injection system.

A

Train ‘A’ and ‘B’ Safety Injection actuation logic were satisfied. Both Trains equipment will automatically actuate.

33
Q

Will the Manual SI Switches work if the Output Mode Selector Switch is in TEST?

A

No! Must be done manually if required.

34
Q

Will the Manual SI Switches work if the Input Error Inhibit Switch is in INHIBIT?

A

Yes!

35
Q

Does a loss of 250 vDC control power result in a Reactor Trip? Why or why not?

A

YES!

The trip is a result of loss of DC power to the underfrequency relays that sense a Low Frequency condition that requires a reactor trip.

36
Q

What happens if you lose CRID 1 and 2?

A

Both Train A 48 and 15 vDC power supplies go away. Reactor trips

37
Q

What does the Mode 5 and 6 switch do?

A

Maintains 120 vAC to slave relays for CVI relays, even with the Output Mode Selector Switch in Test.

38
Q

What is the normal source of power to the Rod Control Logic Cabinets?

A

120 vAC stepped down from 260 vAC Rod Drive MG Set Output

RO34 - Revised and Upgraded Decks (84 decks)

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