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NLO Systems NLIT exam 4 > SC- Condensate Demins > Flashcards

SC- Condensate Demins Flashcards

1
Q

The CD demins are capable of handling what severity of a condenser leak and for how long?

A

1 gpm on a continuous basis

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2
Q

What vessels are in service during full flow Condensate Demineralizer Operations?

A

> 80% power, Five CD Demin vessels in service with one vessel in standby and the Blowdown Demins bypassed

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3
Q

What vessels are in service during full bypass Condensate Demineralizer Operations?

A

All six CD Demineralizers are in standby and the Blowdown Demins are in service

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4
Q

Cation Resin removes what kind of ion?

A

Cations

OH-

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5
Q

Anion resin removes what kind of ion?

A

Anion

H+

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6
Q

What is Decontamination Factor in the CD demin system?

A

DF=Concentration in/ Concentration out

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7
Q

What is meant by the demineralizer resin being “spent” or “exhausted”?

A

The resin is saturated with impurities

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8
Q

What is meant by “throwing” ions in the CD demin system?

A

Further introduction of impurities into a saturated bed that may cause retained impurities to come off the resin

Basically the release of unwanted contaminants

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9
Q

In regards to the CD demin system, what is Affinity (selectivity coefficient)? What happens with a higher concentration of a weaker affinity ion?

A

Property of the resin that indicates its relative attractiveness for one ionic species over another

higher concentration weak affinity ions will be forced onto a resin, allowing resin to be regenerated

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10
Q

As far as the flowpath of CD through the Demins, what is the approximate pressure of the fluid?

A

460 psig

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11
Q

How is a CD demin bed put into a standby condition?

A

Inlet valve open and outlet valve closed, system pressure at 460 psig

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12
Q

What would high D/P across a CD demin bed indicate?

A

Clogged resin trap

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13
Q

What would low D/P across a CD demin bed indicate?

A

Channeling through a resin bed

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14
Q

What is the purpose of the resin traps in the CD demin system?

A

To catch any resin that escapes from the service vessel resin screens before the resin makes it to the steam generators

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15
Q

How does CT interact with the CD Demin system?

A

CT pumps take suction on the CST and provide clean water for the CD demins for transferring, cleaning, and rinsing resin

The water is also used for acid mixing tee to dilute the acid before it is injected into the Cation vessel

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16
Q

What system provides air for transfer, cleaning, and air mixing the resin in the CD demin system?

A

Service Air

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17
Q

What system provides the motive air for the air operated CD demin valves?

A

Instrument Air

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18
Q

What cools the CD demins individual sample coolers?

A

Normal Chilled Water

We no longer sample the combined effluent even though the cooler still exists

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19
Q

What system provides the chemical needed for Cation resin regeneration in the CD demin system and what chemical is used?

A

Chlorine Injection

Sulfuric Acid

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20
Q

What is used to regenerate CD demin anion resin and where does it come from?

A

Chemical production system (CC) from WRF provides 8% Sodium Hydroxide (Caustic)

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21
Q

What does NH do for the CD demin system?

A

Provide power for:

  • regenerant water pumps and their motor space heaters
  • caustic pumps
  • acid pumps
  • caustic day tank heaters

Power is also supplied to the CD demin Programmable Logic Controller

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22
Q

Of the 300 cubic feet of resin in the service vessels, how much of it is cation and anion resin?

A

200 cubic feet of cation resin

100 cubic feet of anion resin

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23
Q

Where are the CD demin service vessels located?

A

100’ Turbine building at the southeast corner

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24
Q

Where is the CD demin system Resin Service Hopper located?

A

140’ turbine building, directly above the Cation vessel

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25
Q

Where can the CD Demin outlet valves be controlled from?

A

Control Room (normally) and at the local control panel

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26
Q

What is the purpose of the four white indicating lights next to the Control room demin switches?

A

Indicate when the associated vessel is in service, in standby, undergoing resin transfer, or undergoing resin rinse

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27
Q

How many switches are at the local panel for each CD demin vessel? What is the interlock between the selector switch and the specific service vessel switches?

A

Six switches

There is a selector switch to determine which vessel’s switches are going to be operated

none of the service vessel switches will work other than the selected vessels switches

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28
Q

Why is a slow pressurization of a CD demin service vessel necessary?

A

Ensures the resin bed is not displaced by the high pressure of the condensate header should the inlet valve suddenly open

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29
Q

How is the CD demin system designed to prevent a quick pressurization? At what pressure will the inlet valve open?

A

When the inlet valve is taken to the open position, a bypass valve around the inlet valve opens

A D/P switch measures D/P across the inlet valve and when it reaches 15 psi, the inlet valve opens and the bypass valve closes

If the switch is not held in the open position until the cycle is complete, the bypass valve will go closed

15 psi

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30
Q

How many different counters are utilized on the CD demin service vessels and what do they do?

A

Two different counters to measure throughput

one is a total gallons counter and the other is a gallons remaining counter

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31
Q

In regards to the six indicating lights, what do the red lights mean?

A

Indicate that the vessel is in a rinse, a resin transfer, or CRUD removal operation

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32
Q

What color light indicates the vessel is in standby?

A

White light

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33
Q

What color light indicates the vessel is in service?

A

Green light

34
Q

Which panel has the controls for the regeneration and resin transfer cycles?

A

Local panel

35
Q

What is the purpose of the Programmable Logic Controller?

A

Used to start or stop the automatic regeneration or resin transfer cycles

36
Q

The PLC is programmed to perform what 5 processes?

A

Full Regeneration

Partial Regeneration

Service Vessel to
Cation Vessel

In Vessel Air Mix

Mix and Hold to
Service Vessel Transfer

37
Q

In these processes, will the PLC perform all sections of the process?

A

No, operator will have to perform certain sections

38
Q

What do we use the Cation Regeneration Vessel for? How does the anion resin get moved to the anion regeneration vessel?

A

Used for Cation-anion resin separation and cation regeneration

draw off header, hollow tube with holes in it to suck it out of the cation regen vessel

39
Q

Where does the CD demin system resin addition hopper drain to?

A

Cation vessel only

40
Q

What happens if pressure gets too low on the inlet of the Cation vessel in the CD demin system?

A

Vent valve is interlocked with a pressure switch that will cause the valve to go closed

41
Q

Regarding the CD demin system, when the air scrubs are in automatic, how long will the pressure switch reverse flow to unplug the screen?

A

30 seconds

42
Q

In the CD demin system, what is the Cation resin cleaning cycle?

A

Cation Vessel timer that lowers water level to the resin bed level

Air Scrub Timer

Compact Resin timer

Backwash timer

Number of cleaning cycles

43
Q

In the CD demin system, what is the Anion resin cleaning cycle?

A

Anion Vessel timer that lowers water level to the resin bed level

Air Scrub timer

Resin Flush timer

Backwash timer

Number of cleaning cycles

44
Q

What is the purpose of the Mix and Hold Regeneration Vessel in the CD demin system?

A

Receives regenerated anion and cation resins for mixing and final rinsing prior to being transferred to a service vessel or the Blowdown Demin System

45
Q

What is the purpose of the Acid Day Tank in the CD demin system?

A

A 400 gallon tank that contains 96% sulfuric acid solution used to regenerate exhausted cation resin

46
Q

How do we determine the level in the CD demin system Acid Day Tank? What fills this tank?

A

Ultrasonic detector that displays on a local meter

turbine building acid storage tanks via the turbine building acid transfer pumps (CI system)

47
Q

How is the CD demin system Acid Day Tank fill valve interlocked with the level switch in the tank? How is the tank fill started? What are the two alarms on the tank?

A

The fill valve closes on a high level in the tank

AO pressing fill start button to start the transfer pumps

Level LO
Level HI-HI

48
Q

Where is the CD demin Acid Day Tank located?

A

100’ level of the Turbine building

49
Q

What type of pumps are the two CD demin Acid Pumps? Power source?

A

Positive displacement, gear drive

NH

50
Q

What is the purpose of the CD demin acid pumps?

A

Take suction from the Acid Day Tank to supply acid solution, through the Mixing Tee to the Cation Regeneration vessel

They have a variable frequency drive that is used to control the acid concentration to the Cation Vessel by controlling the speed of the motor

51
Q

What are the two interlocks associated with the CD demin Acid Pumps?

A

The tank has a low level switch that stops the pumps

The flow switch that measures dilution water flow to the mixing tee will stop the Acid Pump on a low flow condition

When the outlet valves open, the drain valve closes, drain directed to the CD high TDS sump

52
Q

Where are the CD demin Acid Pumps located?

A

100’ southeast corner of the Turbine Building

53
Q

What is the purpose of the Caustic Day Tank in the CD demin system? How is this tank filled?

A

2500 gallon tank that contains the 8% sodium hydroxide solution used to regenerate anion resin

caustic header from water resources

54
Q

How is the CD demin system Caustic Day Tank fill valve interlocked with the level switch in the tank?

A

Fill valve closes on a high level in the tank

55
Q

What is the purpose of the three banks of heaters in the CD demin system Caustic Day Tank? When will they trip off?

A

Maintain the caustic at 115 – 120F

tank level LO

56
Q

What type of pumps are the two CD demin system Caustic Pumps?

A

Centrifugal

57
Q

What is the purpose of the CD demin system Caustic Pumps?

A

Supply Caustic solution from the Caustic Day Tank to the Anion Regeneration vessel

58
Q

What would cause the CD demin system Caustic Pump to shut off automatically?

A

Tank low level

59
Q

What is the purpose of the CD demin system Regeneration Water Transfer pumps and where are they located? Power source?

A

Take suction on the CST and supply water for various resin transfer operations

Located on concrete skid north of the CST

NH

60
Q

Concerning the CD demin system Waste Collection Tank, where is water directed to from X2 discharge valve?

A

High TDS sump, which can be discharged to the CWNT

Normally used at the beginning of the regen process prior to sampling by effluents and during acid and caustic injection when conductivity is very high

61
Q

Concerning the CD demin system Waste Collection Tank, where does X1 direct the water to?

A

Waste water (<1000 umho’s) to the low TDS sump, which is then typically pumped to the CW system

62
Q

What is the purpose of the Turbine Building Acid Transfer pumps?

A

Provide acid to the day tank in the CD demin system

Provide acid injection for pH control in the Chemical Waste Neutralizer Tanks

63
Q

Where are the Turbine Building Acid Transfer pumps located?

A

Next to the Turbine Building Acid Storage Tanks in the North Yard

64
Q

Where are the Turbine Building Acid Transfer pumps powered from?

A

NH

65
Q

Why does the Turbine Building Acid Transfer pump have a bleed hole in its discharge check valve?

A

To assist in overpressure protection of the acid system

66
Q

What feature of these pumps helps to prevent mechanical seals that could possibly leak?

A

Magnetic Shaft Coupling

67
Q

What signal could stop the Turbine Building Acid Transfer Pumps?

A

Low-low level in either Storage Tank

high level in acid day tank

electrical protection

68
Q

What is the capacity of the Turbine Building Acid Storage Tanks? What is in place to protect the tanks from water getting into the tank?

A

11,000 gallons

cover gas of air

69
Q

How often are the Turbine Building Acid Storage tanks swapped?

A

10 year intervals

old tank is emptied and referbished

70
Q

What is the main purpose of the Condensate Demin. system?

A

the Condensate Demineralization and S/G Blowdown Processing subsystem and the
Chem. Monitoring and Addition subsystem, operating concurrently, provide the capability to maintain the proper operating chemistry of the Condensate Feedwater and Steam Generator secondary side water during startup and periods of condenser leakage

71
Q

Concerning the CD demin system, in a properly mixed bed, what do the H+ and OH- ions do upon exiting the demin bed?

A

recombine to form water

72
Q

What is the only CD demin system regeneration step that utilizes DW?

A

anion hot flush

73
Q

WHat powers the anion resin hot flush water heater?

A

NG

74
Q

What system is used for a final rinse to the condenser before a CD demin bed is put in-service?

A

condensate

75
Q

What does the Chemical waste (CM)system do for the CD demin system?

A

regen waste routed to one of the TDS sumps

  • resin air scrub and backwashes to the low TDS sump
  • high concentration chemicalregen process to the high TDS sump
76
Q

How is level in the CD demin beds checked?

A

three gage glasses

77
Q

What is the purpose of the CD demin system anion regeneration vessel?

A

where the anion resin in regenerated before being sent to the mix and hold vessel

unlike the cation regen vessel, there is no resin trap. the backwash flow is just controlled

78
Q

Concerning the CD demin system, what percentage is acid diluted to in the Mixing Tee prior to going to the cation regen vessel? Where does the mixing water come from?

A

8%

CST via the regenerate transfer pumps

79
Q

During a partial regen, where are the contents of the caustic day tank drained to and why?

A

CD high TDS sumps, then pumped to the CWNT (chemical waste neutralizing tank) to prepare for the acid waste during the cation regen

80
Q

What is the purpose of the Waste collection tank? What is the interlock between the two outlet valves?

A

collects all waste from the regeneration process and routes it to the appropriate Condensate Polishing TDS Sump, Low or High. has an internal screen.

only one can be open at a time

81
Q

Why are resin regens performed in the CD demin system when the vessels are bypassed?

A

To reduce resin fouling caused by being in a low flow/no flow standby condition

The resin charge is taken to the Cation Vessel and then the anion resin is drawn off to the Anion Vessel. Both the cation resin and anion resins are cleaned and the cation resin is rinsed. After the anion cleaning an Anion Hot Flush may be performed on the anion resin

anion resin is warmed to 155-170*F

82
Q

What is done just before a CD demin vessel is put in-service?

A

pre-service rinse

rinses back to the 2C condenser shell

NLO Systems NLIT exam 4 (17 decks)

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