Plant Protection System (PPS) Flashcards by Joshua McDowell

State the setpoint, actuation, and instrument for the following:
Variable Over Power Trip

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State the setpoint, actuation, and instrument for the following:
Hi Log Power

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State the setpoint, actuation, and instrument for the following:
Hi Local Power Density

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State the setpoint, actuation, and instrument for the following:
Low Departure from Nucleate Boiling Ration (DNBR)

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State the setpoint, actuation, and instrument for the following:
Hi Presssurizer Pressure

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State the setpoint, actuation, and instrument for the following:
Low Pressurizer Pressure

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State the setpoint, actuation, and instrument for the following:
Low Steam Generator Pressure

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State the setpoint, actuation, and instrument for the following:
Low Steam Generator Water Level

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State the setpoint, actuation, and instrument for the following:
Hi Steam Generator Water Level

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State the setpoint, actuation, and instrument for the following:
High Containment Pressure

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State the setpoint, actuation, and instrument for the following:
High-High Containment Pressure

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State the setpoint, actuation, and instrument for the following:
Low Reactor Coolant Flow

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State the setpoint, actuation, and instrument for the following:
Low Refueling Water Level

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State the setpoint, actuation, and instrument for the following:
Supplementary Protection System

High-High Pressurizer Pressure
2409 psia
Reactor Trip
PT-199 A, B, C, & D, four additional narrow range (1500 - 2500 psia)

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How does PPS respond to a loss of 1 logic matrix relay?

1 RTSG opens

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How does PPS respond to a loss of PNB?

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2 RTSG breakers open

Loss of PN:
Loss of power to one leg of 3 matrices.
Loss of power (1/2) to one leg of each ARC
No auto actuations

How does PPS respond to a loss of PKC?

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1 RTSG breaker opens

RTSG (Reactor trip breakers / RTBs / TCBs)
* UV relay / Shunt trip coils actuate concurrently from auto or manual signal.
* Separate manual trip buttons for each RTB on B05. (A&C or B&D only will NOT trip the reactor)
* Trip path status indications (1-3 and 2-4 lights) (White lights on PPS and ROM C/D)
* Breaker indication on PPS cabinets.
* Control power: 125Vdc PK (RTB1-PKA / RTB2-PKB / RTB3-PKC / RTB4-PKD)

Are PPS setpoints more or less conservative than Tech Spec limits?

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more conservative i.e. you will trip before exceeding the Tech Spec limit

How does placing a parameter in bypass affect PPS?

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Trip/actuation logic becomes 2/3

RPS Trip Channel bypass interlock
* Electrical interlock prevents bypassing more than one trip channel (i.e. two low PZR pressure trip bistables).
* If second channel is bypassed, only the highest priority channel will be bypassed. (A highest, D lowest)

What are the logic matrix power supplies?

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How far does the Pressurizer Pressure variable setpoint lower when the “LO PZR PRESS SETPOINT RESET” button is pushed?

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Low PZR pressure variable setpoint (Trip, SIAS/CIAS)
* Setpoint Reset Push-button on ROMs
* ↓ setpoints 400 psia below current PPZR per PB push
* 100 psia is the lowest setpoint possible
* 10 second TD between PB adjustments
* Setpoint ↑ if PPZR ↑ (lags by 400 psia) until 1837 psia.

How far does the Steam Generator Pressure variable setpoint lower when the “LO SG PRESS SETPOINT RESET” button is pushed?

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Lo SG Pressure variable setpoint (Trip, MSIS)
* Setpoint Reset Push-button on ROMs
* ↓ setpoints 200 psia below existing SG Pressure
* 10 second TD between PB adjustments
* Setpoint ↑ if PSG ↑ (lags by 200 psia)

How would an RCP sheared shaft be diagnosed?

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Rx trip on Low RCS Flow

RCP sheared shaft protection. (not seen by CPCs)
Limits fuel failure and maintains 10CFR100 limits.

What BOP-ESFAS actuation is not initiated on trend?

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RAS
Recirculation Actuation Signal

What does the High Pressurizer Pressure trip protect against?

Prevent exceeding pressure safety limit. Protects RCPB in conjunction with PZR and SG Safeties during: * Loss of Condenser Vacuum (AOO) * CEA Withdrawal from Low Power (AOO) * CVCS Malfunction (AOO) * **MFW Pipe Break (Accident).**

When is the High Log Power trip automatically placed in service?

The Hi Log Power trip and pre-trip bypasses are automatically removed when logarithmic power level **falls below 1E-4 %** neutron rated thermal power.

When does the DNBR/LPD Operational Bypass automatically get removed?

DNBR/LPD Bypass Defeats CPC trips during start-up due to abnormal CEA configuration. Each channel is individually bypassed. Manually bypassed < 1x10-5% (key switches at remote CPC modules on B05) **≥ 1x10-4%: Automatically un-bypassed** Log 2 bistable - safety channel NIs Can be manually un-bypassed. 1x10-5% (setpoint used for initial start-up)

Does the High Log Power bypass get placed in service manually or automatically?

High Logarithmic Power Level Bypass * **Manually bypassed** on each channel from BCPs or ROMs. o ROM bypass switch (white off, amber permissive, red bypassed lights) * Bypassed when Permissive lights are LIT (> 1x10-4%) * Automatically un-bypassed ≤ 1x10-4% o Log 1 bistable – safety channel NIs * Permissive alarm: > 1x10-4% and not bypassed.

Describe the Low Pressurizer Pressure Bypass

Low PZR Pressure Bypass (Trip, SIAS/CIAS) * **Manually bypassed** on each channel (**< 400 psia** RCS pressure) * **Auto un-bypass when > 500 psia** * Bypass and un-bypass from PPS cabinets, ROMs, or RSPs. o ROM bypass switch (white off, amber permissive, red bypassed lights) * Lo PPZR Bypass alarm actuated when any channel is bypassed.

Does the Remote Shutdown Panel have Pressurizer Pressure Reset Push buttons? Steam Generator?

Remote Shutdown Panel (RSP) * 4 PPS modules on RSP contain: * **Low PZR Press ** o Bypass Switch / Bypass Permissive Indicators o Reset Switch o Pretrip Indicator * **Low SG Press Reset Switch** and Pretrip Indicator * Manual MSIS actuation (both trains)

Does the Remote Shutdown Panel have Pressurizer Pressure Reset Push buttons? Steam Generator?

If the OATC manually initiates a RAS using the B&D channels ONLY, will RAS initiate?

No Manual ESFAS Initiation Four actuation switches on B05 (Use all four) A&C or B&D alone **will NOT actuate** ESFAS (same train HSs) Only actuates one leg on each train

How does an Operator manually actuate an ESFAS at the Auxiliary Relay Cabinent? Reset?

Auxiliary Relay Cabinets (ARCs) * 2 ARCs (one per train) * Local actuation (not AFAS): **Simultaneously push both trip buttons** to remove power from relays. o 2 buttons per train. **Local reset** (not AFAS): **Press one reset per train** (leg 1-3 or leg 2-4)

How does the plant respond to low RWT level on Channels A&C? Will B LPSI stop?

The RAS is provided to initiate recirculation of borated water from the containment sump, by opening Containment sump suctions to SI pumps, **tripping operating LPSIs**, and closing SI pump RWT recirculation valves to avoid contamination of the RWT. Must manually open 530

Is Supplementary Protection System trip logic 2/4?

It is **SELECTIVE 2/4** (not A&C or B&D) The SPS trips on High Pressurizer Pressure. The TRM requires a reactor trip when the SPS senses a pressurizer pressure of > 2409 psia. Each SPS channel will trip its associated RTSG so **not all combinations of two channels** tripping will result in a reactor trip.

Plant Protection System (PPS) Flashcards

(35 cards)