SSPS

Question 1

What does the Bistable Test Switch do?

Answer 1

• 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)

Question 2

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

Answer 2

• 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.

Question 3

What powers Train A Slave Relays?

Answer 3

• CRID I (120v AC)

Question 4

What powers Train B Slave Relays?

Answer 4

• CRID IV (120v AC)

Question 5

What will prevent an actuation of ESF equipment?

Answer 5

• 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) **

Question 6

Where does the SSPS General Warning come from?

Answer 6

• Logic Bay

Question 7

What will cause an SSPS General Warning?

Answer 7

• 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

Question 8

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

Answer 8

• Both 15v DC pwr supplies **
  OR
• Both 48v DC pwr supply **

Question 9

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

Answer 9

• CRID I and CRID II

Question 10

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

Answer 10

• CRID III and CRID IV

Question 11

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

Answer 11

• Energize to trip ***

Question 12

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

Answer 12

• Deenergize to Trip (48v DC) ***

- Sent from the Logic Bay

Question 13

How do the Rx Trip switches trip the Rx?

Answer 13

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

Question 14

What does the Shunt Coil do for the RTB?

Answer 14

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

Question 15

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

Answer 15

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

Question 16

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

Answer 16

• Will cause both Rx Trip Bypass Bkrs to open **

Question 17

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

Answer 17

• Trips (actuates) bistables with the exception of CTS

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

Question 18

What is provided power directly from the SSPS Input Bays?

Answer 18

• Input Bay Direct Feeds ***

Question 19

What are the Input Bay Direct Feeds?

Answer 19

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

Question 20

What are all other Input Bay Nondirect feeds powered by?

Answer 20

• Protection racks **

Question 21

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

Answer 21

• Yes, it is visible on the Logic Bays **

Question 22

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

Answer 22

• Rx Trip Bkr A

- Rx Trip Bypass Bkr B

Question 23

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

Answer 23

• Rx Trip Bkr B

- Rx Trip Bypass Bkr A

Question 24

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

Answer 24

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

Question 25

What does the isolation amplifier do?

Answer 25

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

Question 26

Will losing 250v DC cause a Rx trip?

Answer 26

- Yes it will

Question 27

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

Answer 27

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

Question 28

What happens if wrong Output Mode Selector switch is operated?

Answer 28

- General warning on both trains cause a Rx Trip

Question 29

What does the Input Error Inhibit Switch do?

Answer 29

- Removes grounds from all input relay contacts. | - Keeps the universal logic cards from sensing a change in input.

Question 30

What does the MULTIPLEXOR DO?

Answer 30

- Doesn’t DO anything. | - Goes to status lights , alarms, PPC

Question 31

Where does a General Warning come from?

Answer 31

- Comes from Logic Bay

Question 32

What are the inputs to OTΔT?

Answer 32

- RCS ΔT, Tavg, AFD (NIs), Pzr # | - Protects from DNB

Question 33

What are the inputs to OPΔT?

Answer 33

- RCS ΔT, Tavg | - Protects from KW/ft

Question 34

What does the Input Error Inhibit Switch do?

Answer 34

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

Question 35

What powers the slave relays?

Answer 35

- 120v AC

Question 36

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

Answer 36

- Steamline isolation