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Charging & Letdown(CH) Flashcards

1
Q

What does Chemical Volume & control system do for the RCS ?

A

1.)Maintain RCS chemistry for corrosion control
2.)Control RCS PH
3.)Remove corrosion & fission products from RCS
4.)Remove dissolved or entrained gases from RCS

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2
Q

What does Chemical Volume & Control System do for the RCS Inventory Control ?

A

1.)Maintain RCS water inventory
2.)Replaces RCS losses to containment due to leaks in small lines
3.)Provides makeup to RCS for safe shutdown during Natural Circ.

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3
Q

What does Chemical Volume & Control system do for the RCS Reactivity Control ?

A

1.) Maintains RCS boron concentration to compensate for reactivity changes
2.)Compensate for changes in RCS boron throughout core life to control RCS temp
3.)Borate RCS for safe shutdown during Natural Circ. Using only one charging pump
4.) Inadvertent deborated can be detected& terminated before loss of shutdown margin
5.) RWT is sized to fill Refueling Pool & Transfer Canal support of refueling operations

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4
Q

What does Chemical Volume & Control System do for RCS Pressure Control ?

A

Provides Aux. spray for manual control of press. & PZR cooldown during:
-Final stages where RCS pressure is below that required for RCP operation
-Natural Circulation conditions

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5
Q

How does Chemical & Volume & Control System do for Emergency Core Cooling ?

A

-Letdown line can be isolated in event of SIAS & CSAS
-Passive isolation of charging line is provided by an inboard check valve

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6
Q

When will the Letdown Line penetrating containment automatically isolate ?

A

-SIAS
-CIAS

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7
Q

When will Control Bleedoff Flow from RCP seals penetration line isolate on what kind of signal ?

A

CSAS

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8
Q

What signal will isolate Reactor Drain Tank penetration line?

A

CIAS

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9
Q

What does Chemical Volume & control system do for Reactor Coolant Leakage Detection ?

A

-Process indication within CVCS provides means to identify & quantify normal RCS leakage

-Instrumentation provided to identify occurrence of letdown line break outside containment

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10
Q

How does CVCS support Steam Generators ?

A

-Alternate makeup from Reactor Makeup Water Tank to SGs via Aux. Feed water system

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11
Q

How does CVCS support Spent Fuel Pool ?

A

-Primary method of borated water from RWT to Spent Fuel Pool

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12
Q

How does CVCS support RCS inventory during Station Blackout ?

A

During station blackout Charging pumps could be used as alternate method of controlling RCS inventory when leakage from RCP seals is <83gpm

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13
Q

Why must letdown temperature & pressure of flow be reduced when going to CVCS ?

A

Must be reduced to to meet CVCS component design & operational requirements

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14
Q

What does Letdown Flow first run through a Delay Coil ?

A

To allow decay of N-16 activity

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15
Q

What two flow paths are passing through Regenerative Heat Exchanger ?

A

-Letdown is flowing through Tube Side
-Charging for Reactor Coolant Makeup is flowing through shell side

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16
Q

What is the Regenerative Heat Exchanger used for ?

A

-Charging will get cooled by LetDown
-Letdown will Heat up Charging

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17
Q

How’re the Letdown Control Valves positioned ?

A

Positioned in response to signals from PZR level controller

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18
Q

What other subsystem taps into the letdown flow path ?

A

Shutdown Cooling Purification which permits purification during shutdown conditions

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19
Q

What cooling water is sent through the Letdown Heat Exchanger shell side to cool Letdown?

A

Nuclear cooling water

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20
Q

What’re the Back Pressure Control Valves located after letdown heat exchangers used for ?

A

They’re used to prevent flashing inside the Letdown Heat Exchanger by maintaining pressure inside heat exchanger

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21
Q

Why is Letdown flow passed through 1of2 purification filters ?

A

-Removes insoluble impurities to reduce crud buildup on equipment

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22
Q

Where is a portion of letdown flow routed to ? What will automatically bypass Letdown flow to ?

A

-Routed through abandoned Boron meter & Radiation Detector
-High Temperature will bypass boronmeter & Radiation Detector

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23
Q

What kind of Ion Exchangers are used in Letdown system ?

A

-2of3 are Purification Ion Exchangers
-Third Ion Exchanger is a Deborating Ion Exchanger

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24
Q

Which Ion Exchangers are continuously in service ? What does this Ion Exchanger remove ?

A

1OF 2 Ion Exchangers are in service continuously removing ionic materials & particulates

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25
Q

How often is the Second Purification Ion Exchanger used? What is it supposed to do ?

A

It is used periodically & is used to remove lithium from Reactor Coolant as necessary for PH control

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26
Q

What happens once Ion Exchangers lithium capacity becomes exhausted after one core cycle ?

A

That ion exchanger is then used for continuous purification the following core cycle

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27
Q

When is deborating ion exchanger used & why ?

A

It is used near the end of core life because it minimizes liquid waste accumulation

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28
Q

What condition will automatically bypass Ion Exchangers ?

A

They’re bypassed on high temperature to prevent resin from being damaged

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29
Q

What does the outlet flow from Ion Exchangers send flow through ?

A

Common discharge line strainer to collect any resin particles

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30
Q

What is the gas space filled with in the Control Volume Tank ? What is used for ?

A

Hydrogen gas is in the CVT & it is used for oxygen scavenging for RCS chemistry

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31
Q

What does the VCT do for the RCS ?

A

It acts as a surge tank for RCS to accommodate mismatches between: -Actual & programmed PZR level
-Collects RCP bleed off
-Provides NPSH for Charging pumps

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32
Q

What happens when High Water level is reached inside the VCT ?

A

Excess water is diverted to preholdup ion exchanger which then goes to CVCS Hold up Tank

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33
Q

What is normally the status of the Charging Pumps during operation ?

A

-1st pump is ALWAYS in service
-2nd pump is normally in service
-3rd pump is in standby

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34
Q

How does Charging flow get heated up before entering RCS ?

A

Charging Flow gets heated by passing through Regenerative Heat Exchanger at the SAME time at Letdown flow coming from RCS

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35
Q

What does the charging system do for the PZR ?

A

Charging system provides Aux. Spray to the PZR when Main Spray isn’t available

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36
Q

How is the Letdown & Charging system normally operated

A

Normally operates by automatic control

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37
Q

How much bigger in diameter are the Delay Coil pipes compared to Letdown Pipe? Why’re the Delay Coil pipes bigger in diameter ?

A

-Letdown flow pipe is 2inches while Delay Coil pipe is 16 inches

-A bigger diameter will slow water down and allow for more time to allow decay of N-16 gammas within Bioshield

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38
Q

How much delay time does the Delay CoilS provide ?

A

They provide 95second delay through two 11.5’ section of pipe

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39
Q

What is Letdown Regenerative Heat Exchanger Isolation Valve UV-515/UV-516 used for ?

A

-Remain open to allow letdown flow

-Auto closes on SIAS or High Regen. Heat Exchanger outlet at 413F
-A CIAS only closes UV-516

-Manually closed to isolate letdown during a letdown line break

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40
Q

What is Regenerative Heat Exchanger Outlet Isolation Valve UV-523 used for ?

A

-Remain open to provide letdown flow
-Auto closes on CIAS
Or
-High Letdown Heat Exchanger OUTLET temp of 135F

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41
Q

What positions do the RHX isolation valves fail in ?

A

They failed closed on loss of instrument air or power

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42
Q

What does the “Remote-Local/Local” disconnect on the Remote Shutdown Panel(RSP), do for UV-515 Regen. Heat Exchanger?

A

REMOTE-LOCAL:
-Will be able to operate valve from control room or RSP & all auto features available
LOCAL:
-Only allows operation from Remote Shutdown Panel, ALL indication & control isolated from main control room
-The ONLY auto feature is HI RHX temp. UV-515 auto close

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43
Q

Where is the UV-516 letdown to Regen. Heat Exchanger controlled from ?

A

-Valve is controlled from Control room or Remote Shutdown Panel

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44
Q

Where is the UV-523 Regen. Heat Exchanger Outlet Isolation Valves controlled from?

A

Controlled from Control Room

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45
Q

What is the Regenerative Heat Exchanger used for ?

A

-Transfers heat from letdown flow into charging flow to prevent thermal shock on charging nozzles
-Letdown water gets cooled by charging to protect letdown system
-Conserves plant heat(EFFICIENT)

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46
Q

What flow is on the shell side & what flow is on the tube side ?

A

Shell side-Charging Flow
Tube side-Letdown Flow

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47
Q

What temperature is the Outlet Regen. Heat Exchanger supposed to be maintained at ?

A

Supposed to maintain outlet temp. of <413F

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48
Q

What’re the Letdown Control Valves used for ?

A

-They adjust letdown flow based on PZR Level Control System
-Reduces pressure for letdown components downstream

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49
Q

What position will Letdown Control Valves fail to ?

A

They will fail closed on loss of Instrument Air & NK power

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50
Q

When PZR Level Control System is in automatic what is letdown flow limited too ? Why ?

A

-Limited between 30-135gpm
-Limited to 135gpm to prevent channeling in Ion Exchangers

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51
Q

If RCS pressure is >1000psia, how many letdown valves are in service ?
If RCS pressure is <1050psia, how many letdown valves are in service ?

A

> 1000psia ONLY 1 letdown valve in service
<1050psia BOTH letdown valves are in service

52
Q

What is the Letdown bypass valve used for ?

A

Used to warm up Letdown Heat Exchanger when Letdown is secured at power

53
Q

What happens if letdown flow is isolated more than 22minutes ?

A

-Letdown control bypass valve must be opened for at least 4 minutes prior to initiates letdown flow
-Minimizes thermal transients

54
Q

What cooling water is used Letdown Heat Exchanger ? How much is letdown cooled ?

A

-Nuclear cooling water cools let down heat exchanger
-Cools it to 110 degrees to prevent damage to Ion Exchangers resin(<140)

55
Q

What’re the Letdown Back Pressure Control Valves used for?

A

-Control pressure & ensures sub cooled conditions in letdown heat exchanger

56
Q

What pressure do the Back pressure Control Valves maintain Downstream & upstream pressure at ?

A

Upstream-375psig to prevent flashing in letdown heat exchanger
Downstream-Maintained between 40-95psig downstream to prevent damage to components

57
Q

When will the BackPressure Control Valves automatically isolate ? What position do they fail in ?

A

-Isolate on HI-HI temp of 148F at outlet of Letdown Heat Exchanger
-They fail close on loss of Instrument Air

58
Q

What is the Regenerative Heat Exchanger to Letdown Heat Exchanger pressure relief valve Set Point ?

A

600psig

59
Q

What is the Purification Filter Inlet relief valve Set Point ?

A

200psig

60
Q

Where do the pressure relief valves discharge too ?

A

Bothe discharge to Equipment Drain Tank

61
Q

What do the Purification Filters remove ? What micron are they ?

A

Removes 98% unsoluble particles greater than 2micron from letdown flow

62
Q

What kind of filters are used for Purification Filters?

A

Removable cartridge type

63
Q

What conditions must the purification filters be changed ?

A

-DP greater than 25psid with max letdown flow of 72gpm (Alarm activates in control room)
-Rad levels 5 R/hr

64
Q

During normal operations what condition will the Purification filters need to be changed out first by ? What about outage operations ?

A

-Rad level limit will be reached before DP limit during normal operation
-During outage DP limit will be reach first before Rad Level Limit

65
Q

What does the RCS Letdown Radiation Monitor do for the system ?

A

Indirectly monitors Fuel Clad Status

66
Q

What does Radiation Monitor measure to monitor fuel cladding status ? How is the output displayed?

A

-Measures gross gamma radiation of the Letdown passing by, if there is a failure gammas will increase
-Output is displayed on RMS computer for current reading,trending,& monitor status

67
Q

What does the Radiation Monitor Flow Control Valves do for the Radiation Monitor ?

A

-Throttles to create DP across itself forcing flow through RPM
-Monitors flow & controls to create a flow of 8gpm

68
Q

When will the Rad Monitor/Boronmeter inlet bypass valve bypass radiation monitor ?

A

Will divert slip stream flow on High Letdown Temperature

69
Q

What position m does the Flow Control Valve fail to ?

A

Will fail open on loss of air or power to flow controller

70
Q

What is the Ion Exchangers Inlet/Bypass valve used for ?

A

-Directs letdown flow through Ion Exchangers during normal operation
-Bypasses Ion Exchangers during High outlets temp of Letdown HEX

71
Q

When temp will the Ion Exchangers Inlet/Bypass valve, bypass the Ion Exchangers ? What happens on a loss of air or power to this valve ?

A

-Outlet temp of 135F will bypass Ion Exchangers
-On loss of Air & Power it fails to divert flow around Ion Exchangers

72
Q

What’re the 3 Ion Exchangers labeled as ?

A

-Purification Ion Exchanger
-Purification Ion Exchanger
-Deborating Ion Exchanger

73
Q

All Ion Exchangers are interchangeable, but what’re they used for based on the life of the resin ?

A

Purification-Removes normal levels of RCS impurities and radionuclides from letdown
Delithiation- Removes lithium to control RCS PH
Deborating- Reduces RCS boron concentration at end of cycle when dilution is inefficient

74
Q

How much resin does each Ion Exchanger hold ?

A

Holds 35 cubic feet of resin

75
Q

When is the Purification Ion Exchanger & how is it used ? (Mixed bed 1-1 Cation to Anion)

A

-Continuously in service
-Placed in standby during delithiation
-Conditioned with boron prior to used to prevent removal from boron so reactivity isn’t affected
-Loaded with lithium to remove Cation impurity removal without affecting Lithium levels in RCS

76
Q

When is the Delithiating Ion Exchanger placed in service? What happens once Lithium Capacity becomes exhausted? (Mixed Bed1-1 Cation to Anion)

A

-Normally in standby and only placed in service when lithium levels in RCS are high
-Placed in service on night shift for 15mins or 7hours
-ONCE Exhausted it is used as a purification filter for next core cycle

77
Q

When is the Deborating Ion Exchanger placed in service ? How is normally maintained ?

A

-Anion Resin Bed
-Normally used at end of Core Life to remove boron below 30ppm
-Normally maintained inlet & outlet valves secured with equip. Status Tag Hung on hand-wheel to prevent operation

78
Q

What is the common D/P indicator installed across the three Ion Exchangers used for ? What DP does it typically read out to ?

A

-Used to it Ion Exchanger is clogged
-Used by AOs to verify proper operation of Ion Exchanger isolation valves
-Typically reads 4-6psid

79
Q

What is done to place Delithiation Ion Exchanger in service WITHOUT isolating Letdown flow ?

A

1.)Place delithating in parallel with purification Ion Exchanger
2.)Overall D/P will drop to 2-4psid
3.)Then Purification Ion Exchanger will be placed in standby
4.) D/P will increase

80
Q

What is the local flow indicator used as a confirming indication for ? What flow does the flow indicator usually indicate ?

A

-Used as confirming indication during a delithiation
-typically reads 72gpm

81
Q

What is the Letdown Strainer at the discharge of the Ion Exchanger used for ?

A

Designed to catch resin bead fines and prevents contaminating system from very small radioactive particles

82
Q

What is the Volume Control Tank used for?

A

-Acts as a surge tank for charging/letdown mismatches
-Required NPSH for charging pumps
-Hydrogen to RCS for oxygen scavenging
-Collects bleed off from RCP seals
-Provides make-up to RCS

83
Q

How many gallons does VCT hold ?

A

4900 gallon capacity

84
Q

How does increase pressure in VCT affect RCP Seal Bleedoff ?

A

Increase in VCT pressure will increase back pressure, for Bleedoff flow which decreases Bleedoff flow rate

85
Q

What is the VCT pressure normally maintained at ?

A

Normally between 20 & 250psig

86
Q

When is Nitrogen added to CVT ?

A

Nitrogen is added during shutdown modes for Oxygen exclusion

87
Q

What happens when VCT reaches a high level of 60% lvl? What happens when VCT goes back down to 58%?

A

-VCT inlet valve will divert letdown flow to Pre-Holdup Ion Exchanger during VCT high level
-Resets level controller, which will divert flow back to the VCT

88
Q

What happens to VCT when level reaches 5% ?

A

-VCT outlet valve will close to prevent air binding the charging pump

89
Q

What happens when discharge valve UV-501 of VCT closes on low low level?

A

-BAMPs discharge valve UV-514 will open, and a BAMP will start and begin voracious

90
Q

What happens if UV-514 loses power and VCT level 5%or lower ?

A

Gravity makeup valve UV-536 will automatically open

91
Q

If CVT discharge valve(UV-516) is closed, along with Gravity Makeup Valve(UV-536) closed without a VCT low low level what will happen ?

A

VCT discharge valve(UV-501) will automatically reopen when valve finishes stroking in close direction

92
Q

When will UV-501 automatically reopen ?

A

When VCT level recovers to 15% then VCT discharge valve will auto open

93
Q

What is the LC-226 do for the VCT ?

A

Sends signals to the Makeup Control Circuitry for auto makeup to VCT

94
Q

Where does VCT Makeup Control Circuitry send its signals to ?

A

Makeup Flow Control Valves
-210X-Reactor Makeup Water to VCT
-210Y-Boric Acid Makeup VCT
Makeup Flow Path Valve
-Makeup Inlet to VCT

95
Q

Although there is a Level Controller to maintain VCT level, what is normally used to control level ?

A

-VCT level is controlled manually between 40%-60% to maintain positive control of potential reactivity manipulation instead of letting plant control evolutions

96
Q

What is Blended Makeup to the VCT ?

A

-Addition of non-borated water from Reactor Makeup Water Tank & Borated Water from Refueling Water Tank to minimize reactivity change

97
Q

What is the reason for Dilution makeup for the VCT ?

A

-Addition of Non-Borated water from Reactor Makeup Water Tank to CVT will lower boron of charging water, which will reduce boron in RCS, which will add positive reactivity

98
Q

Where can the Charging Pumps draw their suction from ?

A

-Volume Control Tank
-Refueling Water Tank
-Spent Fuel Pool

99
Q

Where are the charging pumps providing flow to ?

A

-RCS makeup
-Aux. Spray
-RCS boration
-RCP Seal Injection

100
Q

What is the designed discharge pressure and gallons per minute for the Charging Pumps ?

A

Discharges 44gpm at a discharge pressure of 2375psig

101
Q

What’re statuses of the Charging Pumps during normal operation ?

A

ALWAYS running-PZR control system CANNOT stop pump
Normally running- High PZR level signal automatically STOP pump
Standby - Low level PZR signal will auto START pump

102
Q

What’re the Charging Pumps powered from ?

A

‘A’ pump is powered by class PGA
‘B’ pump is powered by class PGB
‘E’ pump can be powered from either train

103
Q

How can the ‘E’ charging pump be powered from both trains of PGA OR PGB ?

A

-Transfer ‘E’ charging pump breaker from one train to another, then closing disconnect to that selected power supply

104
Q

What does the seal water system do for the Charging Pumps?

A

-Provides packing lubrication & to control leakage of reactor coolant from charging pump seals

105
Q

When will Seal Water pump start ?

A

Will start when associated charging pump is started

106
Q

When is the Seal Lube Pump started ?

A

-Seal Lube Pump is ran for 10 minutes BEFORE charging pump is started
-Verifies proper seal lube pressure to prolong life of charging pump packing

107
Q

How long can Charging Pump run without Seal Lube Pump ?

A

-It is allowed to run without Seal Lube Pump for 50hours ONLY during emergency conditions

108
Q

What is the automatic makeup to the Seal Water Expansion Tank?

A

Automatic makeup from RMW header

109
Q

What is the suction stabilizer used for ?

A

Absorbs pressure surges in charging pump suction piping

110
Q

What is the stabilizer capacity? What does stabilizer contains inside it ?

A

-Stabilizer capacity is 10 gallons
-Contains a nitrogen charged bladder & flow deflector

111
Q

What is the pre charge pressure at ? What is the flow deflector used for ?

A

-Precharge pressure is at 19psig
-Flow deflector directs flow towards the bladder which absorbs the shock,which reduces vibration in pipe

112
Q

What’re the pulsation dampeners used for ?

A

Dampens pulsations in the Charging Pump discharge piping

113
Q

What does the Dampener contain ?

A

-Contains 1500psig Nitrogen charge bladder
-Spring Loaded Poppet
-Fixed flow diversion baffle

114
Q

What does the diversion baffle do ?

A

Diverts some discharge flow through poppet and bladder interface to absorb pressure surges

115
Q

What is the spring loaded poppet do ?

A

Compensates for small pressure changes

116
Q

When is bladder pressure adjusted ? What is the range ?

A

-Bladder pressure is adjusted during startups & shutdowns to prevent system perturbations
-Range is 30-70% CH header pressure with a target of 60%

117
Q

What’re the additional requirements for charging pump during pre/post operational checks ?

A

Pre-start checks:
-Seal Lubricating Pump running at required pressure
-Oil pressure
Post start checks :
-Room ventilation
-Oil pressure based on temp

118
Q

What is the commitment to NRC regarding the isolation valve at the discharge of the charging pump ?

A

Commitment is to lock open power supply to prevent isolation of PZR Aux Spray Flow path

119
Q

What does the Charging Line Back pressure Control Valve do ?

A

-Ensures proper distribution of charging flow to RCP seals & Aux.Spray
-Maintains backpressure for Aux spray
-Maintains backpressure for RCP Seal Injection
-Maintains backpressure to minimize charging pump pulsations
-Fails closed on loss of power or instrument air

120
Q

What does the Charging Line Isolation Valve do ?

A

-opens to provide normal charging flow through RCS loop 2A
-If back pressure control valve fails open, this valve will close to maintain Aux. Spray through a bypass check valve

121
Q

What is the Bypass Line Check Valve do ?

A

Opens to let charging flow pass upon closure of valves 239 or 240

122
Q

What’re the PZR Aux. Spray Valves for?

A

-Open to provide Aux. Spray Flow to PZR
-Close to terminate spray flow and isolate RCS from charging system
-Provides PZR pressure control when normal pressure control isn’t available

123
Q

Where do PZR Aux. Spray Valves receive there power from? What position do they fail in ?

A

-They powered from PKB-D22 & PKA-D21
-Valve fails closed on loss of power

124
Q

What is Tech Spec for How many charging pumps need to be functional while in shutdown?

A

-At least one charging pump, one HPSI pump, or one LPSI in Boron Injection flow path
-Shall be function and capable of being powered from an operable emergency power source
-In modes 5&6

125
Q

During operations how many charging pumps should be functional?

A

At least two charging pump should be functional in modes 1,2,3,4

126
Q

What is the Tech Spec for how many Aux. Spray Valves should be functional ?

A

BOTH aux. spray valves should be functional in mode 1,2,3,4

Systems (62 decks)

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