LOT 201.20 SSPS Flashcards
- LOT 201.20 SSPS*
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What is the purpose of the first out annunciator panel?
Indicate cause of Rx Trip, SI, or Turbine Trip
Rx Trip and SI located on CP005.
Turbine Trip located on CP006.
- LOT 201.20 SSPS*
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Which actuation train’s urgent alarm will result in a logic train’s urgent alarm?
Actuation Train “A” → Logic Train “R”
Actuation Train “B” → Logic Train “S”
Actuation Train “C” does NOT result in a logic train’s urgent alarm.
Actuation Train “C” trouble alarm does result in a Logic Train “R” AND Logic Train “S” trouble alarm.
- Note:*
- Urgent alarms on CP026.*
- LOT 201.20 SSPS*
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Plant Conditions:
- Unit 2 is in the process of performing SSPS Logic Train “R” surveillance testing.
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What is the function of the System Logic Train “R” INPUT ERROR INHIBIT Switch when placed in the “INHIBIT” position?
Substitutes normal 48 VDC with 15 VDC
Results in a logic train urgent alarm. [1/2]
Allows for testing of master relays w/o actuating slave relays.
- Note:*
- Rx trip occurs if other logic train generates an urgent alarm.*
- LOT 201.20 SSPS*
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What are the bases for the different regions of the Reactor Core Safety Limits - 4 Loops in Operation COLR graph (Tavg vs RTP)?
Flat Region (Green)
Ensures that no bulk boiling will occur at the core exit so that the OPΔT and OTΔT trips remain functional
Steep Region (Pink)
Assures that DNB does not occur (DNBR is maintained >1.52)
- LOT 201.20 SSPS*
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What three systems should not be tested concurrently?
- *Rx trip system**
- Rx Trip / Bypass Breakers*
- *Rx Protection System**
- Instruments*
- 7300 cabinets*
- Rx Trip part of logic cabinets*
- *SSPS**
- Rest of logic / actuation cabinets*
- LOT 201.20 SSPS*
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Plant Conditions:
- Rx Trip
- One of the Rx trip breakers does not open (P-4 not met)
How would the operator stop SI equipment following an inadvertant SI actuation?
- SI signal still active:*
- *Pull to lock**
- Set / Reset → Set is dominant so SI reset will NOT work*
- SI signal clear:*
- *Reset SI**
- (CP001)*
- *Reset sequencer**
- (CP003)*
- *Stop equipment**
- Latch/ Reset → Reset is dominant so SI reset will work*
If SI signal comes back, SI equipment will restart if not in pull to lock.
- LOT 201.20 SSPS*
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What ESF actuations are NOT defeated when the master relay defeat switch is in the “defeat/cvi available” position?
- *CVI**
- Will be defeated in “Defeat All” Position*
- *COMS**
- LTOP Relief*
PZR PORVs
- *PZR Level - Low (17%)**
- Letdown Isolation*
- *VCT Level - Low**
- Swapover to RWST*
Boric Acid Tank Level - Low 2
RHR Flow - Low
- *SI Auto Recirc**
- LHSI / HHSI takes suction on containment sump vice RWST*
- LOT 201.20 SSPS*
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Where are the Rx Trip switches in the MCR?
- *CP005**
- Shows position of Rx Trip and Bypass Breakers*
CP007
- LOT 201.20 SSPS*
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How does the American Nuclear Society (ANS) classify events?
- Condition I:*
- *Normal Operations / Operational Transients**
- No fuel cladding damage*
- Condition II:*
- *Faults of moderate frequency**
- No fuel cladding dmg / No fuel melting / rad release < 10CFR20*
- Worst case Rx trip followed by return to power*
- Condition III:*
- *Infrequent Faults**
- Small amount of fuel dmg / rad release small fraction of 10CFR50.67*
- Considerable outage time*
- Condition IV:*
- *Limiting Faults**
- Rad release < 10CFR50.67*
Condition IV Events:
- Large break LOCA
- Major steamline breaks
- Rod ejections
- Single Reactor Coolant Pump locked rotor
- LOT 201.20 SSPS*
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What supplies power to the Solid State Protection System (SSPS) logic cabinets?
- Channels 1 and 3 of Logic R:*
- *DP1201 / DP1203**
- *E1A11**
- (125 VDC for shunt trip)*
- Channels 2 and 4 of Logic S:*
- *DP1202 / DP1204**
- *E1B11**
- (125 VDC for shunt trip)*
Rectifies 120VAC from DP1201 - DP1204 to 48 VDC and 15 VDC.
- Note:*
- DP1201 supplies Actuation Train A
- DP1203 supplies Actuation Train B
- DP1204 supplies Actuation Train C
- LOT 201.20 SSPS*
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What pressure transmitter does tech specs allow you to bypass rather than place in trip?
- *Containment Pressure (PT-937)**
- Used for Containment Spray*
- Containment Pressure - High 3 (9.5#) [2/4]*
Changes coincidence for Containment Spray to [2/3] vice [1/3] if channel was placed in trip.
- LOT 201.20 SSPS*
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With regards to the Rx Trip Breakers and Bypass Breakers, what happens to the UV relays and shunt trip relays when an auto or manual Rx trip signal is received?
Undervoltage
- Auto Rx Trip:*
- *Same Train Rx Trip Breaker**
- *Opposite Train Bypass Breaker**
- Manual Rx Trip:*
- *All UV Coils de-energize**
- SI Switches in series*
Shunt Trip
- Auto Rx Trip:*
- *Same Train Rx Trip ONLY**
- Manual Rx Trip:*
- *All Shunt Trip Coils energize**
- SI Switches in parallel*
- LOT 201.20 SSPS*
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What is the function of the 7300 cabinets?
Signal conditioning
Determines if setpoint reached prior to sending signal to logic cabinets
- Note:*
- Powered by DP1201 - DP1204 for Channels I-IV respectively.*
- LOT 201.20 SSPS*
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What Rx trips are defeated when the master relay defeat switch is in the “defeat/cvi available” or the “defeat all” positions?
SG Level - Low 2 (20%) [2/4 on 1/4]
- *2 Urgent Alarms**
- Alarms will still come in but no Rx Trip*
- ≥ P-11 will trip the Rx (PZR Pressure ≥ 1985 psig) [2/3]
- Prevents S/U with no ESF actuations
- SR HV OFF disabled
- Prevents loss of Source Range while S/D
- Note:*
- Must go through the Rx trip position to reach “defeat/cvi available” or “Defeat all” positions.
- Must pull out switch to operate
