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Saftey Injection(SI) Flashcards

1
Q

What provides capability for Reactivity Control of Core on the Safety Injection system ?

A

-HPSI
-LPSI
-Safety Injection Tank(SITs)

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2
Q

How does the Safety Injection provide short term and long term Heat removal ?

A

-HPSI
-LPSI
-Shutdown Cooling system
-Containment spray

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3
Q

How does the Safety Injection provide Pressure & inventory control ?

A

-HPSI
-LPSI
-Safety Injection Tanks (SITs)

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4
Q

What does Safety Injection provider for containment ?

A

Iodine removal

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5
Q

How does Safety Injection provide RCS inventory control during Station Blackout ?

A

-HPSI

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6
Q

How does Safety Injection prevent hydrogen build up in containment post-LOCA ?

A

Uses containment spray to reduce hydrogen build up

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7
Q

What events will cause Safety Injection system to be used ?

A

-Loss of Coolant Accident(LOCA)
-Control Element Assembly Ejection Accident
-Loss of secondary coolant including uncontrolled steam release or loss of Feedwater
-Steam Generator Tube Rupture

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8
Q

What are the Active Injection Equipment ?

A

-HPSI pumps
-LPSI pumps

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9
Q

What is the Passive Injection Equipment ?

A

Safety Injection Tanks

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10
Q

What kind of water is injected by the Safety Injection into the RCS ?

A

Borated water

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11
Q

SIAS ensures acceptable consequences during what kind of emergency events ?

A

-Loss of Coolant Accident( LOCA)
-Control Element Assembly ejection accident
-Steam Generator Tube Rupture(SGTR)
-Main Steam Line Breaks(MSLB) inside containment

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12
Q

ESFAS initiates a SIAS to actuate Saftey Injection when which 2-out-of-4 signals are met ?

A

-PZR pressure low 1837psia
-Containment Pressure high 3psig

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13
Q

How much time do the Refueling Water Tanks contain to maintain full safety injection flow ?

A

Has enough borated water for 20 minutes of injection flow with all pump on both trains operating at runout with 10% margin

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14
Q

When a SIAS is generated how much time does it take to deliver borated water to the core ?

A

Within a maximum of 29 seconds after SIAS

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15
Q

Which RCS legs do the HPSI pumps inject borated water into ?

A

HPSI injects water into all 4 cold legs

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16
Q

Which RCS legs do the LPSI pumps inject borated water into ?

A

Injects borated water into 2 RCS cold legs

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17
Q

When will all 4 Safety Injection Tanks inject into the RCS ?

A

They will inject when RCS Pressure drops below Safety Injection Tank Pressure

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18
Q

What happens when Refueling Water Tank reaches 9.4% ?

A

-A Recirculation Actuation Signal is actuated
-Containment Recirc. Sump Isolation valves will automatically open to supply both trains of HPSI pumps

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19
Q

What valves automatically close when a RAS actuates? What valves must be manually closed on a RAS ?

A

-All safety Injection Pump Recirculation valves close
-RWT outlet valves must be manually closed by the control room following a RAS

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20
Q

Post LOCA initiation how long will it take to establish Long Term Core Cooling ?

A

2-3 hours Long Term Cooling will be Established

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21
Q

What flow paths does Long Term Cooling use ?

A

1.)Containment Recirc. pump supplies both train HPSI pumps
2.) HPSI pumps discharge flow is split 50% to 4 Cold Legs; 50% Hot Leg

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22
Q

How is the HPSI flow discharge split during Active Injection Long Term Cooling ?

A

The control room manually operates MOVs to split the flow 50/50 between the cold legs and hot leg by

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23
Q

Why is there a 50/50 split of flow between the 4 cold legs & the hot leg during Long Term Cooling ?

A

-Maintains subcooling

-Insures flushing to prevent boiling induced boron precipitation in Reactor Core, which could cause heat removal to be diminished

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24
Q

What happens to Safety Injection Pump Recirc. Valves during a RAS ?

A

All safety Injection Pump Recirculation valves are closed

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25
Q

What two functions do the LPSI pumps serve ?

A

-Inject Large quantities of borated water into RCS in event of LOCA

-Provides shutdown cooling flow through Reactor Core and Shutdown Cooling heat exchangers for normal plant shutdown cooling

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26
Q

What do the HPSI pumps do for RCS during a LOCA ?

A

-Prevent fuel cladding failure during injection mode following small LOCA

-Provides continuous flow during LOCA after SITs emptied

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27
Q

How fast do LPSI pump motors get up to designed running speed under load ?

A

They can get up to designed running speed within 5 seconds, while underload

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28
Q

What is the rated flow for LPSI pump ?

A

4300GPM

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29
Q

What is the runout flow for LPSI pump ?

A

5500GPM

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30
Q

What is the shutoff head for LPSI pump ?

A

210psig is shutoff head

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31
Q

What is the sizing of the LPSI pump governed by?

A

-Governed by shutdown cooling function
-Single LPSI pump is able to maintain delta T at an acceptable level at initiation of shutdown cooling

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32
Q

What’re LPSI pumps normal condition ?

A

-Maintained in standby condition
Locked open:
-Motor operated suction valve
-Manually operated discharge valve
Isolated from RCS by motor operated loop injection valves

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33
Q

What signals will LPSI pumps auto start on ?

A

-SIAS
-CSAS

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34
Q

What happens to LPSI pump when a RAS happens ?

A

-LPSI pump will shuts off

-Both LPSI Recirc. & safety injection trains common Recirc. Header solenoid operated valve to the RWT

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35
Q

Where do LPSI pumps received power from ?

A

Class 4.16kv buses PBA-S03 & PBB-S04

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36
Q

What is the LPSI pumps Rumble Region ?

A

-2500-3500gpm
-Rumble Region should be avoided

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37
Q

What does HPSI pump provide ?

A

-RCS injection flow to reactor core following small break LOCA
-Flow exceeds decay heat boil-off rate
-Long Term Cooling for reactor core cooling & flushing to prevent boron precipitation
-Able to fill B train only SIT

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38
Q

How fast can HPSI pumps get up to designed speeds under load ?

A

Within 5 seconds

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39
Q

What HPSI pump flow rated for ?

A

-900GPM

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40
Q

What is the HPSI pump runout flow ?

A

1130GPM

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41
Q

What is the minimum shutoff head for the HPSI pump ?

A

Shutoff head is 1775psig

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42
Q

What’re the HPSI pumps sized for ?

A

Sized for one HPSI pump to supply adequate water to match Decay-heat boil off rates soon enough to minimize core uncover

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43
Q

What’re the HPSI pumps normal conditions ?

A

-Maintained in standby
-Manually operated suction & discharge isolation valves that are normally locked
-Isolated from RCS motor operated loop injection valves, which automatically open on SIAS

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44
Q

How is Long Term Core Cooling established with the HPSI pumps ?

A

-It’s established 2-3 hours post LOCA
-Manually realigning HPSI discharge for simultaneous cold legs and hot leg

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45
Q

What’re the automatic actuations for the HPSI pumps ?

A

Auto starts upon receipts of:
-SIAS
-CSAS

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46
Q

What happens to HPSI Recirc. Valve and SI Train Common Recirc. Header to the RWT ?

A

These valves BOTH close going back to the RWT

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47
Q

Where does HPSI pump receive power from ?

A

CLASS 4.16 KV; PBA-S03 & PBB-S04

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48
Q

What is the purpose of Safety Injection Tanks ?

A

Passives means to flood core during a Large LOCA, UNTIL Safety Injection pumps are available

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49
Q

How much water does each SIT contain ? How much is it pressurized ?

A

-Contains 140,000 gallons of borated water
-Pressurized by nitrogen to 600psig

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50
Q

What is supposed to be assumed about the SIT when cold leg breaks ?

A

Entire contents of one SIT is supposed to be assumed completely lost

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51
Q

Why does SIT have MOV & two check valves ?

A

They’re used for isolation of the RCS

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52
Q

During SIT normal operation what position is the MOV in ?

A

MOV is open & with its power removed to prevent inadvertent closure

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53
Q

When will SIT inject water into RCS Cold Leg ?

A

SIT will automatically inject into cold leg when RCS pressure drops below SIT pressure

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54
Q

Why does SIT provide the sole source of makeup water to RCS during a LOCA & LOOP at the same time ?

A

This is because LPSI & HPSI pumps can’t provide flow until the diesel generators startup

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55
Q

During a controlled cooldown what is the RCS depressurized to? What happens to SIT tanks during a controlled cooldown ?

A

The RCS is depressurized to 750psia, then SIT pressure is lowered to 300psig by venting nitrogen to containment

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56
Q

During a controlled cooldown and depressurization what must happen to SIT MOVs when RCS pressure is <430psia ?

A

SIT MOVs may be closed to isolate them from being discharged into RCS during a RCS cooldown & depressurization

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57
Q

What is done to the SIT MOVs during a controlled heat up & pressurization ?

A

When RCS pressure is raised above 430psia, then SIT MOVs will be opened, power removed, & breakers locked open

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58
Q

What is the interlock between SIT MOVs & PZR pressure ?

A

Ensure MOVs will open automatically as RCS pressure increases above SIT pressure & prevents closure

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59
Q

What are the Recirculation Sumps used for ?

A

Collects water released into containment from a break in the RCS & recirculates back into RCS

60
Q

Which pumps are used during Recirculation Mode ?

A

-HPSI to cool and cover reactor core
-Containment spray to cool containment

61
Q

Which pumps will trip on a RAS ? What valves are closed on a RAS ?

A

-LPSI pump will trip to ensure NPSH to the HPSI & CS pumps

-All SI pump recirculation valves to the RWT will be closed to prevent RWT from being contaminated

62
Q

What is used to prevent blockage of the ESF components inside the Recirculation Sump ?

A

Baffles and intake screen limit Max. particle size entering the Recirc. Sump

63
Q

What is the purpose of Containment Spray ?

A

Sprays cool borated water into containment

64
Q

When does containment spray have to be used ?

A

-LOCA
-Main Steam Line Break(MSLB)
-Main Feedwater Line Break(MFLB)

65
Q

What’re the affects when containment spray is used during an accident ?

A

-Rapidly reduced containment press. & temp. below containment design
-Rapidly reduces iodine concentrations in containment
-Reduces DP between containment atmosphere & external environment

66
Q

How do Containment Spray interface with Trisodium Phosphate(TSP) ?

A

-TSP mixed with water in Containment Recirc Sump & achieves uniform PH
-Hydrogen mixes within containment to prevent localized accumulations of hydrogen

67
Q

What accidents will actuate a CSAS ?

A

-LOCA
-Main Steam Line Break(MSLB) inside containment
-Feedwater Line Breaks(FWLB) inside containment

68
Q

When will ESFAS initiate a CSAS ?

A

2 out of 4 signals of containment press high-high at 8.5 psig

69
Q

What is Shutdown cooling Heat Exchanger normally lined up with ?

A

Normally lined up for containment spray

70
Q

What happens to containment spray system when SIAS start ?

A

-Containment spray pump starts
-Containment isolation valve remains shut
-CS pump will operate with Min. flow from the RWT & Recirc. back RWT

71
Q

What happens when Containment spray when CSAS initiates ?

A

-Containment Spray isolation valve will open and allow flow to spray nozzle

-Recirc valves remain open to allow minimum flow to recirculate back to RWT

72
Q

What happens for Injection Mode on CSAS & RAS ?

A

-Containment spray will collect in Recirc. Sump and send it back through CS pump, SDC heat exchanger, back to CS nozzles
-CS pump Recirc valves will close to prevent contaminating RWT

73
Q

What functions do the Containment Spray pumps provide ?

A

-Pumps water into containment spray header to cool/depressurize containment
-Provides shutdown cooling flow during normal cooldowns
-Provides SFP cooling during outages

74
Q

How fast the the Containment spray pumps be brought up to designed speed under load ?

A

Will get up to speed in 6seconds

75
Q

What’re the Containment Spray Pumps flow rates ?

A

Rated flow:3890GPM
Runout flow: 5200GPM

76
Q

What is normal operation alignment for Containment Spray Pump ?

A

-Valve supplying water from RWT is locked open
-Other suction valve from SDC line is normally locked closed
-Containment spray pumps are isolated from containment & spray nozzles

77
Q

What is done to CS pumps when RCS temp is below 200, during shutdown cooling augment ?

A

CS pumps will realign and start in parallel with LPSI pump to provide more flow through SDC Heat Exchanger

78
Q

What is used to cool down spent fuel pool when SFP pumps can’t maintain temperature ?

A

Containment Spray pumps will be realigned and started for additional SFP cooling through SDC HEX

79
Q

What will automatically start Containment Spray Pumps ?

A

-SIAS
-CSAS

80
Q

What happens to recirculation valves for both CS pumps on RAS ?

A

All recirculation valves will close upon a RAS

81
Q

Where do Containment Spray Pumps receive there power from ?

A

Class 4.16KV PBA-S03 & PBB-S04

82
Q

What is the Rumble Region for Containment Spray Pump ?

A

1800-2800GPM should be avoided

83
Q

What is the SDC HEX used for ?

A

-Heat rejection for RCS temp in post shutdown for refueling temp & maintaining fuel temp
-Heat rejection for cooling plant to cold shutdown
-Heat rejection for SFP cooling system during refueling
-Heat rejection during Recirc. Mode following LOCA for containment heat removal

84
Q

What cooling water is sent through HEX to cool primary side ?

A

-Essential cooling water is sent through shell side of HEX
-Then Essential Cooling water sends the heat to the Essential Spray Ponds

85
Q

How is the temperature of the RCS controlled during shutdown cooling ?

A

Control room operator throttling SI side SDC HEX bypass valve

86
Q

How is the temperature of the RCS controlled during shutdown cooling ?

A

Control Room Operator throttles SI side of SDC HEX bypass valve

87
Q

What is the backup cooling water for SDC HEX if essential cooling water is unavailable?

A

Nuclear cooling water can be crossed tied to support essential cooling water when its unavailable

88
Q

What is the purpose of Shutdown Cooling subsystem ?

A

-Reduces RCS temp at a controlled rate
-Not to exceed 75F per hour
-Maintains proper RCS temperature during refueling

89
Q

What temperature does RCS get brought down to during Shutdown Cooling ?

A

-From 350F to a refueling temp of 135F

90
Q

What does Shutdown Cooling do during plant heat up ?

A

Maintains flow through core during plant heat up

91
Q

What’re the shutdown cooling system major components ?

A

-RCS & containment Isolation Valves
-Low Temp. Over-pressure relief valves( LTOPS)
-LPSI pumps
-Containment Spray(CS) Pumps
-Shutdown Cooling Heat Exchanger

92
Q

When does Shutdown Cooling get put into operation ?

A

-RCS temperature is reduced to 350F
-RCS pressure is reduced to 400psia

93
Q

Which pump initially accomplishes reducing RCS temp & pressure to refueling temperature ?

A

LPSI pump will initially accomplish

94
Q

What happens when RCS temperature is reduced to less than 200F during shutdown cooling ?

A

Containment Spray pump is realigned and started to provide additional Shutdown cooling flow to maintain cooldown rate and temperature

95
Q

How is cooldown rate controlled ?

A

Controlled by adjusting flow through SDC HEX

96
Q

During shutdown cooling which pump is used? Where is the suction drawn from ?

A

-LPSI pump is used
-Gets its suction water from the RCS Hot Leg from the Shutdown cooling isolation valves

97
Q

Where does the LPSI pump discharge inject to during shutdown cooling ?

A

It’s injected into ONE of the RCS cold legs

98
Q

What’re the Shutdown Cooling Isolation Valves serve as ?

A

-RCS pressure boundaries
-Containment Isolation

99
Q

What’re the first two in line Shutdown Cooling Isolation Valves ?

A

Double valve RCS pressure boundaries

100
Q

What’re the middle in line Isolation Valves serve as ?

A

-Containment Isolations
-RCS pressure boundaries

101
Q

What’re the last three in line Isolation Valves used for ?

A

Containment Isolation Valves

102
Q

What must be done to the suction line three motor operated isolation valves in series for shutdown cooling ?

A

All three MOV isolations must be opened to initiate shutdown cooling

103
Q

What is the interlock between RCS & Shutdown Cooling Suction Isolation Valves ?

A

If RCS pressure exceeds 410psia, the interlock will prevent SDC Suction Isolation Valves from being opened to prevent SDC over pressurization

104
Q

What’re the power supplies to SIA-UV-651 & SIA-UV-655 ? What’re the power supplies to SIB-UV-652 & SIB-UV-656 ?

A

Class 480 load centers

105
Q

What powers SIC-UV-653 & SID-UV-654?

A

Class 125 VDC control power
Through inverters, PKC-N43 & PKD-N44, which output 480 VAC to motor actuators

106
Q

What is the purpose of the Low Temperature Over Pressure Protection Relief Valves(LTOPS) ?

A

Prevents overpressure of RCS during low temperature conditions, with water solid conditions during either energy or mass input transients

107
Q

What’re Energy Input Transients ?

A

-Start of idle RCP with SG water temp 100F higher than RCS temp. in reactor vessel
-Inadvertent actuation of PZR heaters

108
Q

What’re Mass Input Transients ?

A

-Inadvertent SIAS causing two HPSI pumps to inject
-Three charging pumps injecting with letdown isolated

109
Q

What is the LTOP valve setpoint ? What is the relieving of the a LTOP capability ?

A

-Setpoint is 467 psig
-One LTOP has relieving capability of to prevent over pressurization

110
Q

Where do the LTOP valve relieve too?

A

They’re relieve to the associated trains Containment Recirculation Pump

111
Q

What do the LTOP relief valves provide to RCS when they’re opened?

A

-RCS/Shutdown cooling intersystem leak relief
-RCS Low Temperature Over Pressure Relief

112
Q

How does SI system Interface with PB system ?

A

Class 4.16kv(PB) provides power to:
-HPSI pumps
-LPSI pumps
-CS pumps

113
Q

How does SI interface with PH ?

A

Class 480 MCC supplies power to:
-SI system valves

114
Q

How does SI interface with PK system ?

A

PK provides power to SI system valves

115
Q

How does SI system interface with Class Instrument power(PN) system ?

A

PN supplies power to SI instrumentation and valve position indicator circuits

116
Q

How does SI interface with Diesel Generators(DG)?

A

DGs provide emergency standby power for Safety Injection Pumps & Valves

117
Q

How does SI system interface with SBOGS?

A

SBOG can provide emergency standby power for SI pumps & valves during a Station Blackout

118
Q

How does SI interface with NN?

A

NN provides non class miscellaneous instrumentation for SI system

119
Q

How does SI interface with Chemical & Volume Control(CH) system ?

A

-RWT in the CH system provide the borated water for the SI pumps
-CH provides shutdown of water during Shutdown Cooling
-SI relief valves outside containment discharge to equipment drain tank(EDT)
-SI relief valves inside containment discharge to reactor drain tank(RDT)
-SI tank can be drained to RWT or RDT

120
Q

How does SI interface with Essential Cooling Water(EW)?

A

EW supplies cooling water to Shutdown Cooling Heat Exchanger

121
Q

How does SI interface with Service Gases(GA) ?

A

Nitrogen supplies gas pressure into Safety Injection Tanks(SITs)

122
Q

How does SI system interface with Instrument Air(IA) ?

A

Provides air supply to pneumatic operators,instruments, & controls

123
Q

How does SI interface with ESFAS ?

A

SI receives ESFAS signals to initiate:
-SIAS
-CSAS
-RAS

124
Q

How does SI system interface with BOP ESFAS ?

A

SI pumps & valves receive Loss of Power, Load Shed, & Load Sequencing signals from BOP ESFAS

125
Q

How does SI system interface with Aux. Building HVAC ?

A

-Normal vent. provides cooling to room containing SI system equipment
-Essential vent. provides room specific essential air cooling units to cool SI Pump Room to maintain pump operability

126
Q

What happens to SI system on a loss of Essential Cooling Water(EW)?

A

Would make shutdown cooling heat exchanger inoperable

127
Q

What happens when Shutdown cooling heat Exchanger becomes inoperable ?

A

-At power Containment Spray becomes inoperable
-Shutdown cooling system becomes inoperable

128
Q

How would a loss of instrument air affect the SI system ?

A

Inability to fill/drain Safety Injection Tanks from/to RWT

129
Q

How does loss of Aux. HVAC affect SI system ?

A

-Loss of normal HVAC would require starting ESF air cooling units(ACU) to maintain operability
-Loss of Essential HVAC would result in associated room becoming inoperable

130
Q

Will a loss of a single SI train prevent plant from safely shutting down ?

A

No, SI system is designed to be able to perform its function in safely shutting down plant on just one SI train

131
Q

What happens if one or both trains or individual components of SI system become inoperable ?

A

A plant shutdown may be required

132
Q

What is Mission Time ?

A

Is the amount of time a safety component is able to perform before it needs to stop,repair, or restart the SSC

133
Q

When’re reasonable operator actions allowed ?

A

They’re allows after 30 minutes into Design Basis Accident(DBA)

134
Q

What’re examples of operator action ?

A

Addition of consumables such as oil,fuel,& water

135
Q

What components for the SI system have a mission time of 30 days?

A

-HPSI pumps
-Containment Spray Pumps
-Shutdown Cooling Heat Exchanger

136
Q

Which component has an administrative Mission Time of 30 days & why that component?

A

-LPSI pump for extended Emergency Core Cooling functions

137
Q

What would challenge the 30 day operability for required mission time ?

A

-An oil leak could challenge the required mission time
-AO must identify anything that could change mission time and report to control room supervisor

138
Q

How many SIT are required by Tech Spec ?

A

4 SIT must be operable to ensure 100% content of Three SITs will reach core during LOCA

139
Q

For a SIT to be considered operable what must happen ?

A

Motor operate isolation valve must be fully open, power removed, boron concentration, & nitrogen cover press.

140
Q

For a SIT tank to be considered operable during Shutdown what must happen ?

A

Isolation valve fully open when press. >430psia, power removed when PZR press. is >1500psia, Boron concentration, Nitrogen cover gas

141
Q

What is the LCO for Emergency Core Cooling Systems(ECCS) when plant is operating ?

A

-Two ECCS trains shall be operable during modes 1& 2
-Must be operable in Mode 3 with PZR
press. >1837psia or with RCS Tc>485F

142
Q

What is the LCO for Emergency Core Cooling System during shutdown ?

A

-One HPSI train shall be operable in mode 3 PZR press. <1837psia and with RCS Tc<485F & Mode 4

143
Q

Why must there be an adequate supply of borated water in the RWT ?

A

-To cool & depressurize containment in event of Design Basis Accident
-To cool and cover core during LOCA to remain subcritical following DBA
-Provide adequate water level in Containment Recirc. Dump to support ESF pump in Recirc. mode

144
Q

To consider RWT operable what limits must be established ?

A

-temperature
-Boron concentration
-Water Volume

145
Q

What is the LCO for ECCS TSP ?

A

TSP baskets shall contain >524ft^3 of active TSP during modes 1,2,& 3

146
Q

Why is TSP required ?

A

-It’s required to adjust PH of Recirc. water to >7.0 after a LOCA

147
Q

Why must Recirc. Water be maintained at 7.0 PH after a LOCA?

A

-Prevents iodine from dissolving into Recirc. water and converting into a volatile form

Systems (62 decks)

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