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Section 1 (first 2 Weeks) > Tech Specs & Electrical Distribution > Flashcards

Tech Specs & Electrical Distribution Flashcards

0
Q

How many appendices are there for the license?

A

2
Tech specs
Environmental protection plan

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1
Q

What is the CFR?

A

General permanent rules by Federal Govt.
Divided into 50 titles
10CFR is energy
Covers aspects of design criteria, operating licensing, Radwaste disposal, security, and use of radioactive materials.

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2
Q

What is the final safety analysis report?

A

Document submitted with application for license.

Includes facility, design basis, limits for operation, & presents safety analysis of structures, systems, and components of facility as a whole.

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4
Q

What are the tech specs?

A

Document designed to:

1) define safety limits for plant operation
2) place time limits on degraded conditions
3) place surveillance requirements on equipment
4) define plant design features
5) designate admin controls related to plant ops and ST’s

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5
Q

Do all plant operations have to comply with the technical specs?

A

Yes, they are the law

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6
Q

What is the criteria for an item becoming an LCO?

A

If an item meets one or more of the following:

1) is an instrument that detects or indicates in the control room a significant abnormal degradation of the RX coolant pressure boundary
2) if it’s something that is an initial condition of a design basis accident or transient analysis that either assumes the failure of or presents a challenge to the integrity of a fission product barrier.
3) an item is par of the primary success path and can mitigate a design basis accident or transient that could challenge the integrity of a fission product barrier
4) an item which OE or risk assessment has shown to be significant to public health and safety.

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7
Q

Describe mode 1

A

Power Operation

  • keff >/= .99
  • > 5% rated thermal pwr
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8
Q

Describe mode 2.

A

Startup

  • keff >/= .99
  • </= 5% thermal rated pwr
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9
Q

Describe mode 3.

A

Hot standby
- keff < .99
Tc >/= 350F

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10
Q

Describe mode 4

A

Hot shutdown with all RX vessel head closure bolts fully tensioned
350F >Tc > 210F
Keff< .99

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11
Q

Describe mode 5

A

Cold shutdown with all RX vessel head closure bolts tensioned

  • keff < .99
  • Tc </= 210F
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12
Q

Describe mode 6.

A

Refueling with one or more RX vessel head closure bolts less than fully tensioned

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14
Q

Describe the operating license.

A 
Gives us permission from NRC to operate.
Valid for 40 years.
It's really 4 licenses in one:
   Possess byproduct material
   Possess new fuel
   For the plant and operation
   Possess spent fuel
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15
Q

RX core safety limits

A

1) in modes 1&2, DNB ratio > 1.34

2) in modes 1&2, fuel PCT < 5080F (decreasing by 58F per 10,000 MWD/MTU for burn up and adjusting for burn able poisons)

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16
Q

RCS pressure safety limits

A

Modes 1,2,3,4,&5 RCS pressure < 2750 psia

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17
Q

If you exceed either of the Core safety limits you should:

A

Restore compliance and be in mode 3 within1 hr

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18
Q

If you violate RX coolant system pressure safety limits then:

A

In mode 1 or 2 get back in compliance and move to mode 3 within an hr.

Modes 3-5 restore compliance w/in 5 minutes

Notify the NRC

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19
Q

What is in the design features section of tech specs?

A

Site
Reactor core
Fuel storage (not IFSFSI)

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20
Q

Main loads off 13.8kV system

A

RX coolant pumps
Circ water pumps
480V load centers

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21
Q

Start up transformers

A 
NAN-X01 - 03
Located in startup yard
One primary and 2 secondary windings
4 outputs per transformer
Supply normal and alternate sources of power to the NAN-S05 & 06 loads (varies which depending on which xfrmr)
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22
Q

Which startup transformer feeds which unit for normal power?

A

X03 X02 X01. X03. X02. X01
U1. U1. U2. U2. U3. U3
S05. S06. S05. S06. S05. S06

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23
Q

Describe PBB-S04

A

P - Class
B- 4160kV
B- train b
S- switchgear

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24
Q

What is NK?

A

Non Class 125vDC control power to NA switchgear

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25
Q

What is NB?

A

Non Class 4160vAC

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26
Q

What is NH?

A

Non Class 480vAC MCC System that supplies power to transformer and bus cooling

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27
Q

Describe NAN-S06

A

N-non class
A- 13.8kV
N-non train
S- switchgear

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28
Q

What is NG?

A

Non Class 480V Load Center system that gets power from NA

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29
Q

What is PB?

A

4160V Class power that gets power from NA via ESF Transformer

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30
Q

Red Light

A

Breaker closed & power through trip coil.

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31
Q

Green Light

A

Breaker open

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32
Q

Brighter than normal green

A

Either breaker tripped on a fault OR breaker is racked to test

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33
Q

White light

A

Lockout relay is reset and there is power through it (not tripped)

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34
Q

Clear light

A

Closing spring is charged

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35
Q

Control Power Fuse UC

A

Closing circuit fuse supplies power to the Green light and closing circuit

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36
Q

Control Power Fuse UT

A

Tripping Fuse

power to tripping circuit & red light

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37
Q

Control Power Fuses UA & UE

A

Control Room Fuses

in line with tripping and closing circuits for control room switch

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38
Q

Control Power Fuse UL

A

Lifting Fuse

Supplies power to LB connector for breaker elevating motor

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39
Q

Where are NAN-S05 and NAN-S06?

A

startup yard

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40
Q

Where are NAN-S03 & NAN-S04?

A

outside turbine building; South side

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41
Q

Where do NAN-SO5/S06 & NAN-S03/S04 get power from during normal operations?

A

Normal Startup Transformer

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42
Q

What is the Main Generator supplying power to during normal operations?

A

NAN-S01/S02

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43
Q

At what % Rx power is the Main Generator paralleled onto NAN-S01/S02 & the S03/S04 tie breaker opened?

A

16-20%

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44
Q

Why does the plant trip when you lose power to NAN-S01/S02?

A

loss of RCPs

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45
Q

Can NAN-S01/S02 remain energized on the loss of a Main Generator or Unit Aux Transformer? How?

A

Yes. Fast bus transfer automatically parallels and transfers power across the NAN-S03/S04 breaker allowing the S01/S02 to stay energized

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46
Q

What happens when you lose power to NAN-S05/S06?

A

lose power to the associated ESF transformer and normal power to the PB system bus. Also unit 1 loses normal power to Water Rec., TSC, and switchyard loads.

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47
Q

What happens to the 13.8Kv system on a loss of 480vAC (NH)?

A

power to the transformer cooling fans is lost and the transformers would eventually fail.

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48
Q

What AC electrical sources are required to operate in Modes 1-4?

A

1) 2 circuits between off site transmission network & on site class 1E Power
Distribution
2) 2 diesels, each able to supply 1 train of Class 1E
3) 1 Automatic load sequencer for each train A and train B (diesel autostart and load stripping)

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49
Q

What AC sources must be available per tech specs for shutdown modes 5 & 6?

A

1) 1 circuit between off site transmission and on site class 1E
2) 1 diesel capable of supplying 1 train of Class 1E power

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50
Q

List 4160v Non Class loads

A 
A Condensate Pump (NBN-S01)
B Condensate Pump (NBN-S01)
C Condensate Pump (NBN-S02)
Htr Drn Tnk Pump A (S02) & B (S01)
Plant Clg Wtr pump A (S01) & B (S02)
Turb Clg water pump A (S01) & B (S02)
Nuclear Clg Wtr pump A (S01) & B (S02)
Normal Chillers E01B (S01), E01C (S02), & E02 (S02)
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51
Q

Draw 13.8Kv to 4160v system

A

see drawing

52
Q

What does NH (480v MCC) supply on the 4160v system (NB)?

A

power to transformer and bus cooling fans

53
Q

What do the service transformers (NBN-X01/X02) do?

A

convert 13.8Kv to 4160v between NAN-S01/S02 & NBN-S01/S02

54
Q

What protective devices do the normal service transformers have installed?

A

1) Sudden pressure relay (monitor for arc faults in the xfrmr windings)
2) Undervoltage relay (monitors power supply to cooling fans)
3) Automatic transfer relay (transfer on a loss of normal power)

55
Q

Where are the normal service transformers?

A

outside, south side of turbine building (plant west of main power xfrmrs)

56
Q

Where are NBN-S01/S02?

A

in the turbine building on 100’ level, south side

57
Q

What will cause a fast bus transfer for the NBN-S01/S02 buses?

A

1) differential and high side winding ground
2) sudden pressure
3) high side winding overload and low side winding neutral ground over current

58
Q

What 86 lockout relays are associated with the NBN-S01/S02 switchgear?

A

1) under voltage
2) negative sequence (current imbalance betw. 3 phases)
3) motor feeder ground fault over current
4) motor phase over current
5) differential relay (some motors) (difference between current entering and leaving the winding)

59
Q

What happens when you lose a single NB bus?

A

Plant Cooling water, Turbine Cooling water, and Nuclear cooling water pumps will trip and the standby pumps will auto start

60
Q

If you lose NBN-S01 at 100% power, ______

A

Rx will trip due to loss of S/G water level due to 2 condensate pumps and 1 feed heater drain pump loss

61
Q

If you lose NBN-S02 at 100% power _____

A

Rx cutback and decrease in turbine loading to match Rx power.

62
Q

What does the NG system do?

A

takes 13.8kV and transforms it to 480V and sends it to non class loads >50HP and 480V MCCs

63
Q

If you lose both NBN-S01/S02, _____

A

Rx will trip (no cooling water or condensate pumps)

64
Q

What does NH do?

A

takes the 480V power and distributes it to non class loads <50HP not fed directly from load centers and to 120V AC distribution panels

65
Q

Which non class 480V MCCs get power from a class 1E load center (PG)?

A

NHN-M19, M20, M71, & M72 (all stripped on a SIAS)

66
Q

When do the charging springs re-charge on a 480V load center breaker?

A

upon opening of the breaker

67
Q

Draw Non Class 125V DC

A

see drawing

68
Q

Where does the control power for MCC breakers that need it come from?

A

They supply it themselves ==> if you have a motor operated valve, and you lose 480V power, you not only lose the ability to operate electrically, you will also lose remote valve position indication

69
Q

How long will the non-class batteries last?

A

2 hrs

70
Q

How does the NK system impact the condensate system?

A

Provides DC control power to the mini flow valve solenoids

71
Q

How does the NK system affect the HVAC Diesel Generator building (HD)?

A

supplies DC control power to the diesel generator room A & B HVAC control panels

72
Q

What will you find on the face of the battery charger cabinets?

A

1) Toggle switch in either “Float” or “Equalize”
2) adjustable 24 hour equalizing timer
3) AC Pilot lamp to show when there is an AC voltage
4) DC Voltmeter and Ammeter

73
Q

What do the NK battery chargers do?

A

convert 3 phase 480V AC to 125VDC to supply the batteries and non-class DC loads

74
Q

Where are the battery chargers located?

A

115’ level of turbine building in the DC room

75
Q

What is the normal voltage of the batteries in the NK system?

A

130-135V DC

76
Q

What does NKN-M45 supply power to?

A

1) normal source of power for plant computer
2) controls, instrumentation, and annunciation of all non-class 1E equppment connected
3) control power to NAN-S05 (normal) & NAN-S06 (alt).

77
Q

Where are the batteries located?

A

100’ turbine building in battery room

78
Q

Where can the NK battery bus breakers operated from?

A

Control Room panel B01 normally

Can be operated locally using the trip or close push buttons

79
Q

What breaker light indications are available for the NK battery breakers?

A

Red (closed), Green (open), brighter than normal green (overcurrent trip or withdrawn to test)

80
Q

What lights are available for NK distribution panel indication?

A

local red light & control room alarm for undervoltage as shown on the panel & local red light at the panel and alarm in the control room for ground detection

81
Q

What happens if you lose the NKN-M45 bus?

A

1) turbine thinks it had a Rx trip b/c power to trip relay comes from the M45 bus. Rx will trip after pressurizer pressure reaches set point due to not steaming off.
2) Steam bypass control vlvs won’t work so S/G safetys will open
3) Fast bus transfer won’t happen, so RCP will lose power

82
Q

What happens when you lose NKN-M46?

A

Lose Emergency lube oil pumps

83
Q

What does 120VAC (NN) system supply power to?

A

NNN-D11 & -D12 supplies ungrounded, non-essential, Rx control instrumentation and other station service loads
2) NNN-D15 & D-16 supply grounded power to BOP and misc station loads

84
Q

What happens when NNN-D15 loses power?

A

When the selected power source is lost or has an undervoltage, it will automatically transfer if the manual transfer handle is selected to automatic.

85
Q

What does the TRANSFER TO NORMAL pushbutton do on NNN-D15?

A

If the transfer switch is on the EMERGENCY source AND the manual transfer handle is selected to AUTOMATIC, then when you press the pushbutton it will automatically switch to the normal power supply if it’s available

86
Q

What does the STATIC Transfer switch on NNN-D11 & D12 do?

A

seeks power when power is lost, but it transfers in about 4 cycles instead of 30-90 cycles

87
Q

When manually transferring via the Static Transfer switch, where must power be supplied from and why?

A

Must be supplied by off site power because the switch does not keep the power supplies in synchronism. if power was coming from a diesel or SBOG an out of synch transfer would occur.

88
Q

What is lost when NNN-D11 is lost?

A

1) letdown is lost
2) makeup to VCT is lost
3) steam bypass control vlvs fail closed
4) Rx power cutback is disabled

89
Q

What is lost when NNN-D12 is lost?

A

1) letdown is lost
2) VCT level instrumentation is lost ==> charging pump suction swaps to RWT resulting in boration
3) 2 condensate mini flow vlvs fail open ==> Rx cutback
4) automatic control of control rods is lost
5) steam bypass control vlvs fail closed

90
Q

What happens when NNN-D15 or D16 is lost?

A

1) MFP’s lose control power and speed drops to 300 RPM

2) if the operator sees the loss and trips the correct pump, then cutback. If not, then Rx trip.

91
Q

What does the NQ system do?

A

supplies uninterruptible power to the plant monitoring system.
The system also supplies interruptible power to the alarm systems, fire detection systems, and secondary chemical control system

92
Q

Where does power come from for the NQ system?

A

Normal - from NKN-M45

Alternate - from either NHN-M08 (primary) or NHN-M72 (SIAS load shed MCC)

93
Q

What does the PMS UPS inverter do in the NQ system?

A

supplies continuous AC power to PMS system I/O cabinets & accessories

94
Q

How do you shift power sources for NQN-D01?

A

1) ensure new power source is available
2) if going from alternate to normal, verify “In Synch” light is lit
3) press the correct pushbutton
4) verify transfer by lights

95
Q

What does the isolation transformer in the NQ system do?

A

provides isolation between the primary and secondary to eliminate electrical noise due to switching and leakage currents

96
Q

How does a loss of NQ affect the plant?

A

plant computer and core monitoring computer will both lose power but the plant can stay at power with increased monitoring

97
Q

What is the purpose of the PB system?

A

Supply Class 4160VAC to safety related loads and some loads that are not safety related, but are deemed important to plant ops

98
Q

Draw the PB (Class 1E) system

A

see drawing

99
Q

How are the ESF transformers cooled?

A

oil via natural circ and fans operated by RTD’s

100
Q

What are the loads on the PB system?

A

1) Safety injection and shutdown cooling pump motors
2) Essential Spray Pond pump motors
3) Essential cooling water pump motors
4) Aux feed pump motors
5) “A” normal chiller
6) Essential chillers
7) 1E 480V load centers (PG)

101
Q

What protections do the ESF transformers have?

A

1) sudden pressure relay
2) Automatic transfer relay
3) transformer differential (detects differential current)
4) phase and ground over current

102
Q

What happens when the PB system experiences degraded voltage?

A

4 UV relays actuate when Voltage drops <90% and stays for 90 seconds. prevent the bus from damaging other loads

103
Q

What happens to the PB system on under voltage?

A

4 UV relays actuate when voltage goes <75%. All 8 relays input to BOP ESFAS. It initiates Diesel start, load shed, closure of diesel bkr, starting of load sequencer.
UV condition exists if it gets 2/4 inputs.

104
Q

How is the plant affected by a loss of PB?

A

no losses, but lots of tech specs. If power can’t be restored, then S/D.

105
Q

What equipment makes up the Main Generating system?

A

Main Generator
an isolated phase bus
a bank of 3 generator step up transformers
a unit auxiliary transformer

106
Q

What is the output voltage of the main generator?

A

24kV

107
Q

What does the MB system do?

A

GENERREX provides regulated DC voltage to the generator for field excitation & provides trip signals to the generator trip logic

108
Q

What is hydrogen used for in the main generator?

A

provides cooling for the rotor

109
Q

What does the SO (Generator Seal Oil) system do?

A

controls hydrogen leakage at the annulus between the rotor and the generator casing and maintains hydrogen purity by preventing atmospheric contamination

110
Q

What is the MX system?

A

Remote Multiplex System

111
Q

Classify the main generator.

A 
Turbine driven
four pole
1800rpm
60Hz
synchronous 
revolving field
112
Q

What are the major components of the main generator?

A

stator frame
stator
rotor
generator support

113
Q

Where is the generated electrical power brought out of the generator?

A

from the bottom through the lower frame extension

114
Q

Why are the copper conductors that make up the stator hollow?

A

so that stator cooling water can flow through them.

115
Q

What does the isolated phase bus consist of?

A

3 aluminum conductors (one per phase) supported by porcelain insulators.
Isophase buses have heaters to remove moisture and coolers to remove heat.

116
Q

How can you tell if there is hydrogen in the isophase bus?

A

high hydrogen concentration or low detector sample flow alarm in the control room

117
Q

How many alarms are there on the unit aux transformer?

A

11

118
Q

How is the main transformer cooled?

A

by forced air and forced oil circulation

119
Q

Where can the main generator disconnect be operated from?

A

locally or from the control room

120
Q

Where does generator excitation power come from after the field has been flashed?

A

The generator itself provides it.

121
Q

What does the excitation transformer do and where is it located?

A

located in the excitation dome and it is a combination of current and potential transformers that sense stator AC voltage and sends the output to the regulator to control DC voltage to the field.

122
Q

What components are located in the exciter cubicle?

A 
DC regulator
field flashing circuit
de-excitation breaker (field shorting bkr)
alarms and relays
power rectifiers
123
Q

What does the shorting breaker do?

A

provides a mechanical means of disabling the generator field by short circuiting the field. It can be re-set on the cubicle via a reset pushbutton (RPB)

124
Q

When will NBN-S01/S02 transfer on a fast bus transfer?

A

On a normal service transformer fault

125
Q

What is the normal service transformer?

A

NBN-X01/X02
It comes from NAN-S01/S02 to NBN-S01/S02
2 banks of fans, one on at startup and second on at 70F

Section 1 (first 2 Weeks) (2 decks)

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