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RPS Flashcards

1
Q

LCO 3.3.1 “RPS Instrumentation” requirement

A

4 RPS trip units, associated instrument channels, and associated ZPM Bypass removal channels for each trip function shall be operable

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2
Q

LCO 3.3.1 “RPS Instrumentation” applicability

A
  • High SUR - Modes 1-2. Trip may be bypasse when wide range power is < 1E-4%, or when thermal power > 13% RTP
  • Loss of Load - Mode 1 when thermal power is >= 17% RTP
  • All others are Modes 1-2, and Modes 3-5 with more than 1 full length control rod capable of being withdrawn and PCS boron concentration less than refueling boron concentration
  • TM/LP, Low PCS Flow, Low S/G A Pressure, and Low S/G B Pressure trips may be bypassed when wide range power < 1E-4% RTP, and automatically removed when wide range power is >= 1E-4% RTP
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3
Q

LCO 3.3.1 “RPS Instrumentation” required action if 1 or more ZPM Bypass Removal channels inoperable

A

IMMEDIATELY remove the affected ZPM Bypasses, or declare the affected trip units inoperable

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4
Q

LCO 3.3.1 “RPS Instrumentation” required action if 1 or more functions with 2 RPS trip units or associated instrument channels inoperable

A

WITHIN 1 HOUR place 1 unit in trip

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5
Q

LCO 3.3.2 “RPS Logic and Trip Initiation” requirement

A

6 channels of RPS Matrix Logic, 4 channels of RPS Trip Initiation Logic, and 2 channels of RPS Manual Trip shall be operable

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6
Q

LCO 3.3.2 “RPS Logic and Trip Initiation” applicability

A

Modes 1-2
Modes 3-5 with more than 1 full length control rod capable of being withdrawn and PCS boron concentration less than refueling boron concentration

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7
Q

LCO 3.3.2 “RPS Logic and Trip Initiation” required action if 1 channel of Trip Initiation Logic inoperable

A

WITHIN 1 HOUR de-energize the affected clutch power supplies

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8
Q

LCO 3.3.2 “RPS Logic and Trip Initiation” required action if 2 channels of Trip Initiation Logic affecting the same trip leg inoperable

A

IMMEDIATELY de-energize the affected clutch power supplies

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9
Q

What is the logic required for RPS trips and pre-trips (alarms)?

A
  • Trips - 2/4

- Pre-trips - 1/4

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10
Q

What is the purpose of the Variable High Power Trip (VHPT)?

A
  • Protects against positive reactivity excursions during power operations, and while shutdown.
  • Input comes from TMM Variable High Power output
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11
Q

What are the VHP pre-trip/trip setpoints?

A
  • Min - 28.5%/30%
  • Max - 105%/106.5%
  • Variable - 13.5%/15% above power level when reset button is pushed
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12
Q

What is the purpose of the High Power Rate Trip?

A

Protects against an uncontrolled rod withdrawal or boron dilution while the reactor is critical, but at low power levels
-Input comes from wide range NIs (Channel A/C from NI-3, channel B/D from NI-4)

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13
Q

When is the High Power Rate Trip bypassed?

A

Below 1E-4% and above 15% power

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14
Q

What are the High Power Rate pre-trip/trip setpoints?

A

1.5 DPM/2.6 DPM

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15
Q

What is the purpose of the Low PCS Flow Trip?

A

Protects against fuel damage on a loss of coolant flow (DNB).

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16
Q

What are the Low PCS Flow pre-trip/trip setpoints?

A

97%/96%

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17
Q

What is the purpose of the S/G Low Level (A/B) Trips?

A

Protects against the loss of heat removal capability from the PCS

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18
Q

What are the S/G Low Level (A/B) pre-trip/trip setpoints?

A

31%/28%

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19
Q

What is the purpose of the S/G Low Pressure (A/B) Trips?

A

Protects against excessively high steam flow caused by a steam line break

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20
Q

What are the S/G Low Pressure (A/B) pre-trip/trip setpoints?

A

570 psia/512 psia

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21
Q

What is the purpose of the PZR High Pressure Trip?

A

Prevents operation when the reactor is generating more power than the secondary system is accepting

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22
Q

What are the PZR High Pressure pre-trip/trip setpoints?

A

2185 psia/2235 psia

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23
Q

What is the purpose of the TM/LP Trip?

A

Prevents the violation of minimum DNBR

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24
Q

What are the TM/LP pre-trip/trip setpoints?

A

Variable from TMMs or 1810 psia (whichever is higher)/variable from TMMs or 1760 psia (whichever is higher)

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25
What is the purpose of the Loss of Load Trip?
Limits the PCS stored energy and pressure caused by the suspension of normal steam removal (prevents lifting PZR/main steam safety valves)
26
What is the Loss of Load Trip setpoint?
Auto Stop Oil Pressure < 45 psig
27
When is the Loss of Load Trip bypassed?
Below 15% power
28
What is the purpose of the Containment High Pressure Trip?
Provides an earlier action that would be available with only the TM/LP trip or S/G Pressure Trip. Added to the RPS to provide diversity of reactor trip for a LOCA
29
What is the Containment High Pressure RPS Trip setpoint?
3.4 psig
30
What are the power supplies for the RPS channels?
Y-10/20/30/40 for Channel A/B/C/D respectively
31
How do the manual trip push buttons work to trip the reactor?
- C-02 de-energizes all 4 M coils, which de-energizes the power supplies to the CRDM clutches. - C-06 de-energizes an undervoltage relay, which opens the RPS breakers.
32
What is the normal voltage on the M coil volt meters?
20 VAC. Any other indicated voltage means there is a problem.
33
What is the purpose/function of M coil arc suppression?
When an M coil de-energizes, a voltage is induced into the M coil from its field collapsing, which could cause damage. Arc suppression is used to prevent this damage.
34
What is the purpose/function of the K relays?
1 relay from each CRD clutch power supply. When a reactor trip occurs, CRD clutch power supplies de-energize, which de-energizes the K relays. When the K relays de-energize, the following occurs: - CRDM Rundown - Trip Reset - Reset Lockout - Turbine Trip
35
What is the CRDM Rundown function associated with de-energizing the K relays?
Sends a ROD IN signal to all CRDs, except the part-length rods, so any rod with a stuck clutch will be driven into the core.
36
What is the Trip Reset function associated with de-energizing the K relays?
Prevents RPS from resetting when trip condition clears, because when the K relay de-energizes, a contact associated with the K relay opens. Prevents ratcheting damage that could occur if the clutches were re-energized before the rods fully dropped.
37
What is the Reset Lockout function associated with de-energizing the K relays?
Prevents manually resetting RPS for 30 seconds to prevent ratcheting damage that could occur if the clutches were re-energized before the rods fully dropped.
38
How does a turbine trip occur when the K relays are de-energized?
20/AST relay (solenoid trip on balance beam)
39
What are the 3 types of RPS Trip Bypasses?
- Trip Channel Bypass - Automatic Bypass - Zero Power Mode Bypass
40
What is the RPS Trip Channel Bypass used for?
- When a trip channel must be removed - To prevent a reactor trip during maintenance - When trip unit instrument is inoperable
41
How do we bypass an RPS Trip Channel?
Each trip unit (11 per channel, 4 channels, so 44 total) has a bypass key switch. There is only 1 key for each trip (11 keys total), and when the key is turned to bypass, it can't be removed, so only 1 channel of each trip can be bypassed at a time. To bypass, insert key, and turn 90 degrees clockwise. Verify yellow light illuminates, and log it.
42
What happens when an RPS Trip Channel is bypassed?
- Yellow light illuminates to indicate that the trip has been bypassed. - Trip logic goes to 2/3 instead of 2/4
43
What RPS trips are automatically bypassed, and when are they bypassed?
- Loss of Load - bypassed < 15% power - High Rate of Change (High SUR) - Bypassed below 1E-4% power by 1 of 2 source range/wide range NIs (NI 1/3 bypass A/C channels and NI 2/4 bypass B/D channels), and bypassed > 15% power by power range NI in that channel.
44
What is the Zero Power Mode Bypass used for?
Used when the reactor is shut down to allow control rods to be moved for testing or to reserve shutdown margin for operating conditions.
45
What trips are bypassed by the ZPM Bypass?
- PCS Low Flow - S/G Low Pressure - TM/LP
46
How do we place RPS into ZPM Bypass?
- All 4 channels must be in bypass - Ensure Wide Range NIs operable - Ensure power < 1E-4 - Verify boron concentration > cold shutdown concentration - Insert key and turn clockwise - Push each of the 4 test switches and ensure no lights lit
47
What are the yellow lights associated with the ZPM Bypass?
- 1 for each of the 4 trips that are bypassed (Low PCS Flow, S/G A Lo Pressure, S/G B Lo Pressure, and TM/LP) - 4 (1 for each trip that is bypassed) "ZPM Auto Disable" lights - Lights for the individual trips will only light when you push the test button, and that trip is not bypassed - "ZPM Auto Disable" will only light when you push the test button and power > 1E-4
48
How do you place an RPS Trip Unit in "trip"?
- Loosen 2 screws, and pull out at least 2 inches | - RPS now sees this trip as tripped, so logic is now 1/3 instead of 2/4
49
How long can an RPS Trip Unit be bypassed?
Can be bypassed for 7 days, then it must be placed in "trip"
50
What is the purpose of ATWS?
Provides a diverse means of tripping the reactor and main turbing, and actuating aux feed when a failure of the RPS system is sensed
51
What causes ATWS actuation?
PZR pressure > 2375 psia (2/4 logic)
52
What are the ATWS power supplies?
- Pressure switches - Y-10/20/30/40 - ATWS Matrix Relays - L-58/59 (from MCC-24/21, which come from LCC-12/11) - 2/4 logic matrix - Y-230, which is fed from D-204 (CFMS battery charger/inverter)
53
What action is required if a PZR pressure sensor fails high?
- ATWS shall be bypassed | - Operation with ATWS bypassed shall be minimized, and not to exceed 7 days
54
What conditions require a manual reactor trip?
- Safety of the core in jeopardy - RPS setpoint exceeded and no reactor trip - To protect equipment, personnel, and/or the public - Unusual circumstances
55
Who authorizes resetting the RPS, and how is it done?
- SM authorizes - Ensure no reactor trip signal is present - ATWS aligned - RPS breakers reset and closed - Push reset push button
56
How do you verify RPS is reset?
- Reactor trip alarm clear - 24 matrix relay lights energized - 4 arc suppression volt meters reading 20 VAC - Red "Trip" light not lit - "AC/DC on" lights lit - "AC Trouble" and "Ground" lights lit
57
When shall the ATWS switch be in NORMAL?
Whenever the reactor is critical, unless required for testing.
58
How should replacement of any RPS Trip Unit Red Matrix lamps be performed?
Per a planned work activity due to the potential for a shorted bulb to trip both auctioneered matrix ladder power supplies and cause a plant trip.
59
What are the clutch DC power supplies?
Y-30/40
60
When is the RPS placed in service?
While in Mode 3 with all 4 PCPs running, prior to entry into Mode 2

Advanced Systems (36 decks)

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