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ATR SRO Level of Knowledge > Plant Protective System > Flashcards

Plant Protective System Flashcards

TRA00055

1
Q

What are the two subsystems of PPS?

A
  1. Reactor Shutdown System (RSS)
  2. Engineered Safety Feature (ESF)
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2
Q

What is the purpose of the Reactor Shutdown System (RSS)?

A

Designed to protect the nuclear aspects (thermal margins and core limits) of the plant.

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3
Q

What is the purpose of the Engineered Safety Feature System (ESF)?

A

Designed to protect the mechanical nature of the plant (PCS piping, core configuration, and fission release to the environment.

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4
Q

What are the design features of RSS?

A

2/3 Logic
Single Failure Analysis
Fail-Safe Design
Solid-State Components
Physical Separation
Electrical Separation
Redundancy
Diversity
SATS
Quality Level Components

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5
Q

Draw RSS Actuation System

A
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6
Q

What is the fundamental mechanical purpose of the RSS?

A

To insert the safety rods.

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7
Q

What three forces work to insert the safety rod?

A

Safety Rod Drive Package Scram Spring
Core D/P
Gravity

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8
Q

List the RSS Functions.

A

Neutron Level
Wide Range Neutron Level
Quad DT
Fission Break
Vessel Inlet Temp
Vessel Outlet Temp
Emergency Pump Recirc Flow
Emergency Flow
Seismic
Manual Scram
Loop Scram
Vessel DP
Vessel Outlet Pressure

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9
Q

What is the purpose of Neutron Level Scram?

A

Limit power level.

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10
Q

What is the purpose of Wide Range Neutron Level Scram?

A

Limit power level and rate of change.

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11
Q

What is the purpose of Quadrant Differential Temperature Scram?

A

Slow power increases and power imbalance accidents.

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12
Q

What is the purpose of Fission Break Scram?

A

High radiation fields in the PCS detects fuel element cladding failure.

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13
Q

What is the purpose of the vessel inlet and outlet temperature scrams?

A

Protects the core and PCS.

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14
Q

What is the purpose of the Emergency Pump Recirculation Flow Scram?

A

Assures minimum flow through the core in the event of a loss of commercial power for the PCPs.

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15
Q

What is the purpose of the Emergency Flow Scram?

A

Protects against low primary coolant flow events during depressurized operation.

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16
Q

What is the purpose of the Seismic Scram?

A

Low-level acceleration that could be a precursor to a significant shock wave from a seismic event.

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17
Q

What is the purpose of the vessel DP Scram?

A

Terminate operation for low-flow events.

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18
Q

What is the purpose of the vessel outlet pressure scram?

A

Diverse scram to inlet pressure High.

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19
Q

List ESF/RSS Functions.

A

Vessel Outlet Pressure Low
Vessel Inlet Pressure High
Vessel Inlet Pressure Low
Vessel Differential Pressure High
Vessel Level Low

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20
Q

What does Vessel Outlet Pressure Low ESF do?

A

LOCA ESF secures the PCPs.

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21
Q

What does Vessel Inlet Pressure High ESF do?

A

Secures PZR and GSW Pumps.

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22
Q

What does Vessel Inlet Pressure Low ESF do?

A

LOCA ESF secures PCPs

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23
Q

What does Vessel Differential Pressure High ESF do?

A

DP ESF may secure PCPs

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24
Q

What does Vessel Level Low ESF do?

A

Alarm only.

25
Where are the PPS rooms located?
First Basement, East Side
26
What fire protection exists for PPS Rooms?
5 Zones, 1 per each and another common zone for all PPS rooms and SATS Halon system and dry pipe sprinkler.
27
Draw block diagram of PPS.
28
Where are the PPS Battery Rooms?
Diesel Area of 670.
29
What are the power supplies for the PPS Channel Battery Chargers?
A - E-15 Diesel Commercial B - E-10 Commercial C - E-12 Commercial D - E-11 Diesel
30
Give battery performance parameters for PPS.
>80% capacity, 50F electrolyte temp, SOC >90% and discharge rate of <1A, rated for 790 minutes
31
When does 32VDC distribution voltage low alarm annunciate?
<29.5V
32
What are the 32VDC charger trouble alarm setpoints?
38.5VDC High Voltage 29.5VDC Low Voltage
33
Describe ventilation arrangement for PPS Battery Rooms
1 fan per two rooms (A/B) (C/D)
34
What is the PPS DP setpoint?
200 psid
35
What is the PPS Outlet Pressure setpoint?
400 psig
36
What is the PPS Inlet Pressure setpoint?
500 psig
37
What is the PPS Emergency Flow setpoint?
7000 GPM
38
What is the PPS Emergency Recirc Flow setpoint?
300 GPM
39
What is the PPS Quadrant DT setpoint?
75F
40
What is the PPS Inlet Temp Setpoint?
150F
41
What is the PPS Outlet Temp Setpoint?
200F
42
What is the PPS Neutron Level setpoint?
1.5Nf
43
What is the PPS Fission Break setpoint?
50 R/hr, 1.4 Nf
44
What is the PPS vessel level trip setpoint?
100 in. H2O
45
How does Emergency Pump Recirc trip work in pressurized vs depressurized?
Pressurized: standby pump must start and reestablish flow in 10 seconds or scram will occur Depressurized: loss of both recirculation flows, reactor scram without a delay.
46
Which PPS function drawers are NOT located in the PPS rooms?
Fission Break
47
Describe Stack RMS system.
Monitors radiation levels at stack. >45mrem/hr, RMSS seals confinement of ATR building. 2/3 logic
48
What is the setback setpoint?
1.07 Nf
49
What is the SATS power supply?
120 VAC from E-390
50
Describe Pressurized Mode Selector Switch Position.
Used when PCS pressure above atmospheric Inhibits Emergency Flow Discharge scram Activates 10-second time delay on Emergency Pump Recirc Flow SCRAM
51
Describe Depressurized Mode Selector Switch Position.
Used when reactor is operated in depressurized mode. Neutron level signal X100 Inhibits Inlet Pressure, Outlet Pressure, Vessel DP Scrams Enables Emergency Flow Scram No time delay for EPRF scram WR NL up-ranging to ranges 9-12 inhibited.
52
What is the power supply for the RCC Control Cards?
Powered from 32 VDC PPS batteries.
53
Draw reactor thimble locations.
54
Typical trip time per TSR action statements on failed PPS?
30 minutes
55
Lessons learned at ATR on PPS?
Notify CR of impending alarm prior to action. Failed relay on M-8 PCP, questioning attitude.
56
Where are the seismic detectors located?
Rod Access Room ceiling.
57
Where are the fission break detectors located?
Pipe tunnel
58
Where are the vessel level detectors located?
Rod access area.
59
Where are Inlet, outlet and DP transmitters?
One in bypass demin, two in HDW equipment room.

ATR SRO Level of Knowledge (31 decks)

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