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NLO Systems 2023 > CH- Chemical and Volume Control System > Flashcards

CH- Chemical and Volume Control System Flashcards

1
Q

When does the Charging system provide auxiliary spray to the pressurizer?

A

final stages of plant shutdown when RCS pressure is too low to operate RCPs

during natural circulation

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2
Q

What does auxiliary pressurizer spray allow the operator to control manually?

A

pressure and pressurizer cooldown

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3
Q

When will the letdown line penetrating containment automatically isolate?

A

SIAS

CIAS (containment isolation actuation signal)

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4
Q

What CVCS containment penetrations will automatically isolate and what actuation signals will isolate them?

A

letdown line- SIAS or CIAS

RCP seal controlled bleed off flow- CSAS

RDT outlet-CIAS

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5
Q

What chemistry and purity control does CVCS accomplish in the RCS (reactor cooling system)?

A

corrosion

pH

remove corrosion and fission products

remove dissolved/entrained gases

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6
Q

CVCS maintains RCS inventory control. What does it make up for?

A

small leaks

make up necessary for safe shutdown during natural circulation

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7
Q

CVCS provides RCS reactivity control. How does it accomplish this?

A

maintain boron concentration during normal operation and dilution

borate RCS for safe shutdown during nat. circ.

detecting and terminating an inadvertent deboration that would cause a loss of shutdown margin

RWT sized to fill the refueling pool and transfer canal

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8
Q

CVCS process indication provides a means to identify and quantify what?

A

normal RC leakage

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9
Q

What is provided to identify the occurrence of a letdown line break outside containment?

A

instrumentation

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10
Q

What support functions does CVCS provide?

A

alternate make up to S/G

Spent fuel pool make up

forward flow testing SI check valves

alternate control for RCS inventory when leakage through RCP seals is less than or equal to 83gpm

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11
Q

What is the maximum administrative rate to heat up the RCS for CVCS to accept letdown?

A

75*F/hr

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12
Q

What is the maximum administrative rate of cooling the RCS for CVCS to make up using 2 of 3 CH pumps?

A

75*F/hr

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13
Q

Where does the Letdown line take suction from in the RCS?

A

up stream of the RCP on the 2B leg

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14
Q

What is the purpose of the delay coils?

A

to allow N-16 to decay for 95 seconds before continuing in the system

half life of N-16 is 7 seconds

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15
Q

What is the purpose of the CHB-UV-515 and CHA-UV-516 valves?

A

containment isolation

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16
Q

What is the purpose of the regenerative heat exchanger?

A

to increase system efficiency by reclaiming some of the heat from letdown and heating up the charging flow back into the RCS

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17
Q

What is the purpose of the let down flow control valves? How many are there?

A

to maintain pressurizer level

2

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18
Q

Where does SDC (shutdown cooling) tap into the CVCS system (chemical and volume control) and why?

A

upstream of the letdown heat exchanger

enables purification during shutdown conditions

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19
Q

What cools the letdown heat exchanger?

A

nuclear cooling (NC)

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20
Q

What is the purpose of the valves down stream of the let down heat exchanger?

A

the back pressure control valves maintain system pressure upstream of the heat exchanger to prevent flashing the coolant to steam when exiting the heat exchanger

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21
Q

What condition causes letdown to bypass the boronometer and radiation monitor?

A

high temperature

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22
Q

How many ion exchangers are required for full letdown flow?

A

1 of 3

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23
Q

What are the three ion exchangers used for?

A

one is for deborating, another for delithiating, the third is for purification

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24
Q

How often is the delithiating ion exchanger in service?

A

for a short period every night

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25
Q

Why is lithium removed from the RCS?

A

pH control

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26
Q

How long does it take for the delithiating ion exchanger to exhaust?

A

the core cycle

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27
Q

When is the deborating ion exchanger used?

A

near the end of core life

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28
Q

In regards to the ion exchangers, what is done when there is a high temperature alarm?

A

they are bypassed to protect the resins

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29
Q

What is the downstream component of the ion exchangers? What is its purpose?

A

strainer

collect resin fines

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30
Q

What is the purpose of the VCT?

A

scavenge oxygen in the gas space

RCS surge tank

collect RCP seal bleed off

NPSH to charging pumps

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31
Q

What happens when the VCT reaches a high water level?

A

excess water is diverted to radioactive collection, processing and storage part of CVCS

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32
Q

What is the purpose of the gas space in the VCT?

A

filled with hydrogen, the letdown flow enters the VCT through the gas space and scavenges oxygen, thus aiding RCS chemistry

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33
Q

What is the normal status of the charging pumps?

A

one always running, one normally running, the third in standby

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34
Q

Where does charging flow re-enter the RCS after passing through the regenerative heat exchanger?

A

2A leg In the RCP discharge

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35
Q

Where does the aux spray line tap off the main charging line?

A

after the regenerative heat exchanger

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36
Q

Where are the delay coils located?

A

inside bio-shield wall, 110’ near RCP 2B

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37
Q

When does CHB-UV-515, Letdown to Regenerative HX isolation valve, close automatically?

A

SIAS

413*F regenerative heat exchanger outlet temp

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38
Q

When does CHA-UV-516, Letdown to Regenerative HX isolation valve, close automatically?

A

SIAS

CIAS

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39
Q

When does the CHB-UV-523 close?

A

CIAS

let down heat exchanger high outlet temperature of 135*F

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40
Q

What temperature closes the let down heat exchanger outlet valve?

A

135*F

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41
Q

How are the regenerative heat exchanger isolation valves operated and how do they fail?

A

air operated

fail closed

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42
Q

Where can the regenerative heat exchanger isolation valves be operated from?

A

515 and 516:
control room
remote shutdown panel

523:
from control room only

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43
Q

If the CHB-UV-515 hand switch is in the local position, are the auto close features still available?

A

SIAS is not

Hi RHX out let temp is

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44
Q

Where are the UV-516, -516 valves located?

A

100’ containment, RCP 2B pump bay entrance

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45
Q

Where is UV-523 located?

A

aux building west wrap 90’ mezzanine

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46
Q

What type of HX is the RHX?

A

shell and U-tube

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47
Q

Where is the RHX?

A

110’ containment behind the elevator, above UV-515, -516

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48
Q

What are the letdown control valves?

A

CHE-LV-110P

CHE-LV-110Q

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49
Q

What is the purpose of the letdown control valves?

A

maintain pressurizer level by adjusting letdown flow

reduce let down pressure

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50
Q

How are the let down control valves operated and how do they fail?

A

air operated

fail closed

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51
Q

What maintains letdown flow between 30 and 135 gpm?

A

pressurizer level control system?

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52
Q

What determines the number of letdown control valves in service? Why?

A

While heating up, above 1000 psi only one valve is open to prevent lifting the relief valve

While cooling down, below 1050 psi, two valves are open to provide adequate letdown flow

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53
Q

What is the purpose of the letdown control valve bypass valve?

A

CHN-HV-526 is solenoid operated along with a flow orifice to allow .5 gpm to flow constantly to keep downstream components warm

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54
Q

When letdown is isolated for greater than 22 minutes, how long must CHN-HV-526 be open prior to initiating letdown flow?

A

4 minutes

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55
Q

Where are CHE-LV-110P and -110Q located?

A

Aux building 110’ and 100’ above and below each other, 110P on top

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56
Q

Where is CHE-HV-526 located?

A

aux building 100’

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57
Q

At what temperature is nuclear cooling water regulated to maintain the let down heat exchanger outlet?

A

~110*F

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58
Q

Where is the LDHX located?

A

aux building 100’ by CHE-LV-110Q

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59
Q

At what pressure do the letdown back pressure control valves maintain upstream? Downstream?

A

~375 psi

40-90 psi

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60
Q

What are the valve names for the letdown back pressure control valves?

A

CHE-PV-201P

CHE-PV-210Q

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61
Q

What auto closes the letdown back pressure control valves?

A

LDHX outlet temp of 148*F

loss of air

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62
Q

Where are the back pressure control valves located?

A

aux building 100’ and 110’, LDHX valve gallery

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63
Q

What is the lift pressure of the LDHX relief valves and where to they relieve to?

A

upstream is 600
downstream is 200

EDT

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64
Q

What are the two conditions in which the Letdown purification filters will be replaced?

A

D/P higher than 25 psi

filter rad levels exceed 5 R/hr

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65
Q

Where are the purification filters located?

A

aux building 120’

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66
Q

What does the RCS letdown radiation monitor detect?

A

SQN-RU-155 detects possible fuel cladding failure

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67
Q

Where is SQN-RU-155 located?

A

aux building 120’ next to boronometer room

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68
Q

What is the normal reading on SQN-RU-155? alert set point? high alarm set point?

A

10 mR/hr

85mR/hr

120 mR/hr

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69
Q

What is the purpose of the valves controlling flow or bypassing flow to SQN-RU-155?

A

allows 8 GPM to flow to it

bypasses on high letdown temp

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70
Q

What directs letdown flow through or around the CVCS ion exchangers?

A

a three way valve, CHE-UV-520

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71
Q

What causes the ion exchangers to be automatically bypassed?

A

high letdown temperature is 135*F

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72
Q

If CHE-UV-520 loses air or power, will the ion exchangers be in service or bypassed?

A

bypassed

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73
Q

What type of resin is used in the CVCS ion exchangers?

A

H-OH mixed bed

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74
Q

When is lithium added and removed from the RCS?

A

added at the beginning for pH control due to high boron concentration

removed nightly for pH control as boron concentration lowers through core life

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75
Q

To remove boron, is anion or cation resin used?

A

anion

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76
Q

When valving in a CVCS ion exchanger, what is the rate at which it is valved in? How long does it take to see a change in the RCS?

A

slowly

7 minutes

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77
Q

How does letdown temperature affect RCS temp?

A

higher letdown temp. makes resin release boron, raising RCS concentration and lowering RCS temp.

lower letdown temp, makes resin absorb more boron, lowering RCS concentration and raising RCS temp.

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78
Q

The AO can affect letdown temp. with changes in:

A

nuclear cooling water and plant cooling water through the nuclear cooling heat exchanger

79
Q

What is the capacity of the VCT?

A

4900 gallons

80
Q

Why is it important to remove oxygen from the RCS?

A

to prevent corrosion

81
Q

What is the normal VCT pressure?

A

20-25 psig

82
Q

How does the VCT pressure affect RCP bleed off flow rate?

A

increases the back pressure for the bleed-off flow, decreasing the flowrate

83
Q

When and why is nitrogen added to the VCT?

A

during shutdown to ensure that oxygen does not collect in the VCT

84
Q

Are the RWT and RMWT borated or unborated?

A

RWT is borated

RMWT is unborated

85
Q

What do the RWT and RMWT have to do with RCS dilutions?

A

both tanks supply borated and unborated water to be blended to a specific boron concentration and is added to the VCT

86
Q

What are the purposes of the dry and wet reference legs on the VCT?

A

dry leg provides auto make up

wet leg provides high and low level actuations

87
Q

Where is the VCT located?

A

aux building 120’

88
Q

What are the main purposes of the charging pumps?

A

provide charging flow from the VCT, RWT or SFP to the RCS, seal injection and aux spray

RCS boration

89
Q

What is the discharge flow, discharge pressure and power origin for the charging pumps?

A

44 gpm each

2375 psig

class 480v LCs

90
Q

In regards to the always running charging pump, What can automatically stop the pump? The normally running pump?

A

nothing

pressurizer high level signal

91
Q

What auto starts the standby charging pump?

A

pressurizer low level alarm

92
Q

What prevents the E charging pump from being powered from both PGA and PGB at the same time?

A

Two breaker cubicles, only one breaker

disconnect switch operation for pump

93
Q

Describe the charging pump seal water system.

A

controls reactor coolant leakage from the pump seal

seal water pump starts when its respective charging pump starts

for testing, the seal lube water pump is ran for 10 minutes prior to running charging pump

94
Q

How long, in an emergency situation, can the charging pumps run without seal lube water?

A

50 hours

95
Q

seal water expansion tank automatically makes up from where?

A

RMW header

96
Q

What is used in the suction of the charging pumps to reduce pressure surges and vibration?

A

suction stabilizers

97
Q

Describe the suction stabilizers.

A

10 gallon capacity with nitrogen charged bladder and flow detector. charged to 19 psi

98
Q

Describe the charging pump pulsation dampeners.

A

located in the discharge piping, 1500 psi nitrogen charged bladder, spring loaded poppet and a fixed flow diversion baffle

99
Q

In regards to the charging pumps pulsation dampeners, bladder pressure is adjusted during startups and shutdowns, what is the pressure range and target?

A

30-70% of CH header pressure with a target of 60%

100
Q

Where are the charging pumps located?

A

aux building 100’

101
Q

What charging system valve is required by the NRC to have its respective breaker locked open?

A

CHA-HV-524, charging pumps discharge header to RHX isolation valve

102
Q

What does CHE-PDV-240 do?

A

the charging line backpressure control valve ensures proper distribution to aux spray and RCP seal injection

103
Q

Check valve CHE-V435 ensures how much PSI backpressure for aux spray and seal injection?

A

200psi

104
Q

What is the purpose of CHB-HV-203 and CHA-HV-205, pressurizer aux. spray valves?

A

provide pressure control to the pressurizer when main flow is unavailable

isolate CH from the RCS

105
Q

What are the tech specs related to the charging pumps?

A

While shutdown:
at least one charging pump, HPSI or LPSI must be functional in the boron injection flow path (mode 5, 6)

While operating:
two charging pumps shall be functional (mode 1-4)

106
Q

What is the tech spec related to the Aux. spray valves?

A

Both shall be functional is modes 1-4

107
Q

What does the flex strategy consist of?

A

using both on-site and off-site equipment for longer-term response to emergency situations

108
Q

What is the purpose of the RDT?

A

Receives discharge from pressurizer safety valves, SDC and SI relief valves, RCP seal bleed off drains and drains and leakages from containment

109
Q

What pressure is the nitrogen blanket held at in the RDT

A

.5 psig

110
Q

What is the minimum quench volume of the RDT?

A

52%

111
Q

What psi is the RDT rupture disk set at?

A

120 psid

112
Q

Where is the RDT vented to when tank pressure is under 10 psi?

A

gaseous radwaste

113
Q

Where is the RDT vented to if tank pressure is above 10 psi?

A

containment

114
Q

Where is the RDT located?

A

containment 80’

115
Q

What is the purpose of the EDT?

A

receives drainage from recycle drain header and ion exchanger drain header, gas stripper bypass and misc. relief valves outside containment

116
Q

What is the nitrogen blanket pressure in the EDT?

A

3 psig

117
Q

Where does the EDT relieve to on over pressure?

A

non-esf sump

118
Q

Where is the EDT located?

A

aux. building 40’

119
Q

What is the purpose of the reactor drain pumps?

A

transfer contents from the RDT or EDT through the reactor drain filter to the PHIX

120
Q

What is the capacity of the reactor drain pumps?

A

50 gpm

121
Q

What prevents both reactor drain pumps from running?

A

interlocks

122
Q

How do the reactor drain pumps stop automatically?

A

low tank levels in RDT or EDT

123
Q

Where are the reactor drain pumps located?

A

aux building 40’

124
Q

What is the purpose of the pre hold up ion exchanger (PHIX)?

A

letdown purification with abnormally high levels of radionuclides or contaminants

reduces chemical contaminants prior to BAC

125
Q

What is the maximum letdown flow rate through the pre hold up ion exchanger?

A

150 gpm

126
Q

What process liquids does the PHIX purify?

A

reactor drain pump discharge

VCT diversion

CVCS hold up tank pump discharge

127
Q

Is the PHIX in service or bypassed when letdown is to be returned to the VCT?

A

bypassed

128
Q

How is resin replacement accomplished in the PHIX? Where is the spent resin sent?

A

sluicing

to solid radwaste

129
Q

What is the purpose of the gas stripper?

A

removes non-condensable gases from letdown

130
Q

What is the purpose of the RCP seal injection?

A

cool seal cavity and flushes the seal cavity of CRUD

131
Q

Where is RCP seal bleed off directed to?

A

bleed off flow is directed to the VCT

face seal leak off is directed to the RDT

132
Q

What is the flow path for the RCP seal injection water?

A

Charging pumps send water through a temperature protection isolation valve, then through a HX, through two seal injection filters, and a flow control valve, then into four branches, each going to one RCP

133
Q

In the case of a containment isolation, where is the RCP controlled bleed off directed to via relief valve?

A

RDT

134
Q

What components are in the chemical addition unit for the CVCS system?

A

Chm. add tank, outlet strainer, pump

135
Q

Where does the chemical addition pump discharge in to the CVCS system?

A

upstream of the RHX

136
Q

How many of the RCP seal water injection filters are normally in service?

A

1 of 2

137
Q

What chemicals are added to the chemical addition tank in the CVCS?

A

lithium, hydrazine and hydrogen peroxide

138
Q

What is the capacity of the chemical addition tank in the CVCS?

A

8 gallons

139
Q

What is the capacity of the CVCS chemical addition pump?

A

25 gph at 2735 psig

140
Q

What lithium isotope is added to the RCS?

A

Li-7

141
Q

Why is hydrazine added to the RCS during start up?

A

scavenges oxygen after RCS is filled and vented

142
Q

Why is hydrogen peroxide added to the RCS?

A

initiates a CRUD burst

143
Q

What are the three general areas the radioactive collection, processing and storage subsystem receive water from?

A

letdown diverted from the VCT

RDT

EDT

144
Q

What is the purpose of the Reactor drain pumps?

A

sends the RDT and EDT flows through the reactor drain filter to the PHIX or PHIX bypass

145
Q

At what high temp. is the PHIX bypassed?

A

140*F

146
Q

What does the PHIX remove from the system?

A

resin

lithium

other ionic radio nuclides

147
Q

Where does flow go after the PHIX?

A

gas stripper or gas stripper bypass

148
Q

What happens when there are gas stripper trouble conditions?

A

flow is diverted back to the EDT

149
Q

What are the two possible flow path destinations after the CVCS gas stripper? What is the normal line up?

A

VCT or hold up tank

VCT

150
Q

When the VCT reaches a high level, where is the gas stripper outlet flow directed to?

A

hold up tank

151
Q

What processes the contents of the hold up tank when it reaches capacity?

A

boric acid concentrator

152
Q

In the gas stripper, to what temp. does the heat recovery heat exchanger bring incoming water?

A

150*F

153
Q

What is used to heat the flow through the gas stripper package pre heater? What temp. does it bring the flow to?

A

aux. steam

240*F

154
Q

What happens in the stripper column of the gas stripper package?

A

dissolved non-condensable gases are removed

gases rise into the overhead condenser

liquid goes to the suction of the pump

155
Q

How does the reboiler aid in the stripping process of the stripper column of the gas stripper package?

A

reboiler heats and steams a small portion of the liquid flow out of the stripper column and heats the stripper column flow

156
Q

In the gas stripper package, what does the overhead condenser do? What is it cooled by?

A

reduces gas volume and condensation leaving the stripper column

nuclear cooling water

157
Q

In the gas stripper package, what purpose does the condensate pot?

A

collects residual moisture in the gas going to the over head condenser

158
Q

What temperature is the stripped liquid coming out of the gas stripper after cooler? What cools the after cooler?

A

130*F

nuclear cooling water

159
Q

Is the Reactor make up water tank borated?

A

no

160
Q

Where do the RMW pumps send flow to?

A

VCT/CH pump suction

RWT

EDT

RDT

gas stripper

161
Q

What is the boron concentration of the RWT?

A

4000-4400

162
Q

Where do the BAMPs send water to?

A

VCT/CH pump suction

boric acid batch tank

SFP

SFP clean up

163
Q

Where can the RWT gravity feed to?

A

CH pump suction

SI pumps

164
Q

Can the CH pumps supply the SFP with borated water?

A

yes

165
Q

Where does the borated water and non borated water mix to supply make up to the VCT?

A

blending Tee

166
Q

What are the outlet flows of the RMWT?

A

alternate source for Aux. feed pumps

dilution water for RCS

water for in-plant use

167
Q

What is the capacity and minimum temperature of the RMWT?

A

480k

40*F

168
Q

Where does the RMWT over flow to?

A

CVCS hold up sump

169
Q

What are the normal and alternate make up water sources of the RMWT?

A

DW normal

Recycle monitor tank is alt

170
Q

What are the RMWPs powered from?

A

NH

171
Q

What is the status of the RMW recirc valve when dilution flow is below 20 GPM? When is it closed?

A

open

full dilution flow

172
Q

What is the purpose of the RMW flow control valve?

A

measures the flow rate to the RCS and boric acid batch tank and adjusts position

173
Q

What is the purpose of the RWT?

A

Provide suction flow to ESF pumps and RCS make up through CH

174
Q

What is the capacity of the RWT?

A

750,000

175
Q

What is the temp. range of the RWT?

A

60-120

176
Q

Where is the normal make up supplied from to the Refueling Water Tank?

A

CVCS hold up tank

177
Q

What is done shortly before the outage to ensure maximum capacity of the RWT?

A

boric acid batching

178
Q

What is used to transfer water from the SITs to the RWT?

A

LPSI or CS pump

179
Q

What are the level detections associated with the RWT?

A

level for isolation on RAS and LPSI trip

to stop BAMPs on low level

level indication and CR alarms

180
Q

What is the purpose of the BAMPs?

A

provide borated water to VCT

CH suction

SFP

181
Q

What are BAMPs powered from?

A

NH

182
Q

What is the capacity of the BAMPs based on?

A

to individually exceed all three charging pumps

183
Q

What is the purpose of the BAMP recirc valve?

A

opens when boration flow is less than 20 GPM

closes on full boration flow

184
Q

What does the boric acid flow control valve measure to position the valve properly?

A

flow rate from the refueling water tanks to the blending tee

185
Q

What is the purpose of the boric acid batch tank?

A

to batch crystalline boric acid with water for adjusting boric acid concentrations in the RWT

186
Q

To what temperature do you raise the water in the boric acid batch tank to keep boric acid in solution?

A

155-160*F

187
Q

At what point is the boric acid powder added to the boric acid batch tank?

A

> 155*F

188
Q

What is the motive force to draw boric acid out of the BABT through the eductor to the RWT?

A

RMWP or BAMPs

189
Q

What is the motive force flow of the BABT eductor?

A

33 gpm

190
Q

In what modes of operation should the RWT be operable? What are the limit requirements?

A

1-4

temperature, boron concentration and volume

191
Q

In modes of operation 5 and 6, what borated sources of water must be functional for reactivity control?

A

spent fuel pool

RWT

192
Q

How many gravity feed flow paths must be functional from borated sources to RCS during operation? During shutdown?

A

two

one

193
Q

What modifications were made to the CVCS to support loss of all AC guidelines?

A

Using FLEX pumps that take suction from various points on the RWT and injecting that supply into the HPSI discharge headers, or FLEX SFP make up pump suctions when CST is making up SGs

NLO Systems 2023 (67 decks)

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