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My NLIT > CH-Boric Acid Reclamation System > Flashcards

CH-Boric Acid Reclamation System Flashcards

1
Q

What is the purpose of the Boric Acid Reclamation subsystem?

A

Designed for separation of the process fluid (borated water from the CVCS HUT) into a distillate with less than 10 ppm total dissolved solids and a concentrate.

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2
Q

Where do we reuse concentrate?

A

In the borated Refueling Water Tank.

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3
Q

Where do we reuse distillate?

A

In the Reactor Makeup Water Tank

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4
Q

Where does the vapor release?

A

to atmosphere

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5
Q

What normally drains to the CVCS HUT?

A

The Radioactive Collection, Processing, and Storage subsystem, and Volume Control Tank Divert.

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6
Q

How many CVCS HUT Pumps are normally running and why?

A

1 of 2 normally running so that boron doesn’t come out of solution.

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7
Q

Where does the Process Feed Valve CHN-LV-287 connect to?

A

CVCS HUT > CVCS HUT pump > Flash Tank

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8
Q

What is the flow path for the condensate loop?

A

Concentrator Pumps > Concentrate Heater > Flash Tank
A small portion leaves the Heater and goes to the Concentrate Transfer Pumps for concentrate cooling and recirc

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9
Q

What is the heat source for the concentrate heat exchanger?

A

Auxiliary steam- when the steam leaves the HX it goes to the Aux steam condensate receiver tank.

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10
Q

What is the flash tank?

A

Heated concentrate 240°F enters the Flash Tank through a nozzle onto an inverted conical surface.
Some flashes to steam and goes to the Vapor Separator.
The remaining concentrate is returned to the pump suction.

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11
Q

What is the path for concentrate cooling and recirculation?

A

Heater > Concentrate Cooler, Nuclear Cooling Water (NC) cools concentrate.

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12
Q

How does concentrate get back to the CVCS HUT after the concentrate cooler?

A

Flows through Density Transmitter DT-295 that doesn’t work in any Unit. Operators manually control Flow Control Valve DV-295 to recirculate ~ 10 gpm of cooled concentrate back to the CVCS Holdup Tank through CHN-V001.

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13
Q

What is the vapor separator?

A

Vapor from the Flash Tank enters the bottom of the Vapor Separator and passes up through three mist eliminators to remove any entrained moisture.

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14
Q

What is the vapor separator discharge?

A

Normal Op-Some vapor is sent to Radwaste Building HVAC Exhaust and Plant Vent to atmosphere. This is done to reduce tritium concentration and control inventory.

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15
Q

What component helps to maintain the temperature and pressure in the BAC?

A

PCV-993 Distillate Condenser Valve

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16
Q

Where do the distillate pumps take suction from?

A

distillate sumps

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17
Q

How do we cool the phase changed liquid that comes out of the distillate condenser?

A

It goes through Distillate Cooler before it goes to the pumps to be used for cooling and flushing the BAC system.

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18
Q

What is the purpose of the Distillate Discharge and Recycle valves LV-289Q and LV-289P?

A

Flow from distillate cooler is constantly monitored for purity. If conductivity too high LV-289Q will close and LV-289P will open sending the flow to the recycle path until conductivity goes back down. This is automatic action.

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19
Q

What is a Distillate Flush?

A

When there is adequate level in the Distillate Condenser, some is supplied back to the BAC components:
* Vapor Separator for back flushing the bottom two mist eliminators
* BAC Pump seals for flushing and cooling:
o Concentrator Pumps
o Concentrate Transfer Pumps
o Distillate Pumps
* Flash Tank level transmitters for flushing
* Concentrate Cooler discharge line for flushing.

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20
Q

What is the makeup water if the Distillate Condenser is low level?

A

Reactor Makeup Water (clean water)

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21
Q

What determines the rate of evaporation and therefore, establishes the concentrator processing rate?

A

Auxiliary Steam

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22
Q

What helps the keep the BAC from going into a vacuum?

A

Low Pressure Nitrogen

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23
Q

What is the purpose of the CVCS HUT?

A

Provides holdup capacity for:
* for Volume Control Tank (VCT) diversion upon high level in the VCT.
* to allow recovery of various system drains, reliefs, and leakage collected in the Reactor Drain Tank (RDT) and Equipment Drain Tank (EDT).

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24
Q

What other pumps can discharge into the CVCS HUT?

A
  • Boric Acid Makeup Pumps
    o May be lined up to transfer water to the BAC from the:
    ▪ Refueling Water Tank (RWT)
    ▪ Spent Fuel Pool (SFP)
  • Spent Fuel Cleanup Pump discharge through the Spent Fuel Pool Cleanup Ion Exchangers
25
Q

Where does the CVCS HUT vent to?

A

Fuel Building HVAC exhaust header

26
Q

How do we process the CVCS HUT water?

A

When a hi alarm @17ft actuates, then the Boric Acid Concentrator (BAC) is started up to begin processing the HUT contents.
After the BAC contents are returned to the CVCS HUT until chemistry happy.
The water is then sent to the Refueling Water Tank.

27
Q

What is the purpose of the CVCS HUT pumps?

A
  1. Recirculate to prevent boron from settling & coming out of solution
    2.Transfer from CVCS HUT to the BAC for processing to raise the boron concentrate.
    3.Transfer from CVCS Hut to the Refueling Water Tank following processing by the BAC.
28
Q

What would automatically trip the CVCS Holdup Pumps?

A
  • CVCS Holdup Tank level Low-Low
  • BAC Flash Tank High level
  • Letdown Diversion to the Pre-Holdup Ion Exchanger when the CVCS Holdup Tank contents are being purified through the Reactor Drain Filter (CH-V686 open).
29
Q

What interlock do the CVCS holdup pumps have?

A

The Pumps are interlocked to prevent the simultaneous operation of them.
ONE AT A TIME

30
Q

What is the power supply for the CVCS HUT pumps?

A

NH

31
Q

What is the purpose of the boric acid concentrator?

A
  • Recover the boron concentration in the water for reuse in the Refueling Water Tank.
  • Release tritium from the system
  • Control water inventory
  • Provide makeup water to the Reactor Makeup Water Tank if tritium concentration is low enough.
32
Q

What is the operation of the BAC?

A

Processes relatively good quality water stored in the CVCS HUT. Separates boron from clean water. The Boron goes to the HUT to raise the concentration to 4000-4400ppm for refueling water tank makeup.

33
Q

If we can’t get the CVCS HUT to reusable conditions (4000-4400 ppm boron) where do we sent the unusable water?

A

Liquid Radwaste Concentrate Monitor Tanks

34
Q

What are the three BAC modes of operation?

A
  • Distillate Release Mode
    o Releases the vapor to atmosphere to control water inventory and/or release tritium from the system
  • Water Mode
    o Condenses the vapor into a distillate and provides it as makeup to the Reactor Makeup Water Tank if the tritium concentration is low enough.
  • Recirculation Mode
    o Condenses the vapor into a distillate and recirculates it to the inlet of the system.
35
Q

What is the purpose of BAC concentrator pumps?

A

Provide the process fluid (concentrate) flow through the BAC Heater and:
* into the Flash Tank.
* through the Concentrate Cooler.

36
Q

What will automatically trip the Concentrator Pumps?

A

Flash Tank level Lo-Lo

37
Q

What cools the concentrator Pumps?

A

Cooled distillate (or Reactor Makeup Water) is provided for inter-seal cooling and flushing to prolong seal life.

38
Q

What is the power supply for the Concentrator Pumps?

A

NH

39
Q

What is the purpose of the Boric Acid Concentrate Heater?

A

Adds thermal energy to the recirculating concentrate.

40
Q

What is Aux steam used for in the BAC concentrate heater?

A
  • Concentrate directed to the BAC Flash Tank is heated to ~240ºF.
  • Concentrate directed to the Concentrate Transfer Pumps drains out of the Heater before passing through the tubes.
41
Q

What is the pupose of the Boric Acid Flash Tank?

A

Allows some of the heated concentrate to flash to a vapor.

42
Q

What is the design of the Boric Acid Flash Tank?

A

Concentrate heated to ~240°F enters the Flash Tank through a tangential nozzle onto an inverted, truncated, conical surface. This geometry imparts a swirling motion to the concentrate. Boiling occurs due to the reduced pressure within the Flash Tank. The swirling motion provides vapor/moisture separation.

43
Q

What is the purpose of the condensate transfer pumps?

A

Provide flow from the Heater through the Concentrate Cooler to:
* Concentrator Pump suction
* CVCS Holdup Tank
* LRS Concentrate Monitor Tanks
* Refueling Water Tank

44
Q

What is the normal operatiion of the BAC Concentrate Transfer Pumps?

A

Rated at 25 GPM, when the BAC is operating then one pump is running with the 2nd pump secured.

45
Q

What automatic action is associated with the BAC Concentrate Transfer Pumps?

A

The Concentrate Transfer Pumps trip on low Heater level to protect them from cavitation.

46
Q

What is the power supply for the Concentrate Transfer Pumps?

A

NH

47
Q

What is the purpose of the BAC Concentrator cooler?

A

Removes thermal energy from the concentrate.

48
Q

What is the design of the Concentrate Cooler?

A

Heated concentrate enters the tubes at ~230ºF and is cooled to 160 – 180ºF by Nuclear Cooling Water on the shell side.

49
Q

What is the purpose of the BAC Vapor Separator?

A

Removes any remaining moisture in the flashed vapor from the Flash Tank via three 6” thick stainless steel wire mesh moisture separator pads.

50
Q

What is the purpose of the the BAC Distillate condenser?

A

Condenses vapor discharge from the Vapor Separator.

51
Q

What is the purpose of the BAC vent cooler?

A

Allows non-condensable gasses to vent from the flashed vapor without releasing the vapr.

52
Q

What is the purpose of the BAC Distillate Pumps?

A

Pumps the water to the Distillate Condenser through the Distillate Cooler and a conductivity sensor for system use & possible makeup water RMWT.

53
Q

What is the design of the Distillate Pumps?

A

25 GPM, 1 of 2 running while BAC in op, sends flow through the distillate cooler and conductivity cell to provide:
* Flushing and cooling water for BAC
* Recycle water to the Pumps. This is used when:
o Shutting down the BAC to flush the system and prevent boron precipitation.
o High conductivity is sensed from CE-289
* Makeup water to the RMWT, bypassing the BAC Ion Exchanger (Water Mode).

54
Q

What is distillate water used for?

A

Flushing BAC when there is not enough liquid in the Flash Tank.
To cool pump seals to prolong life of pumps.

55
Q

What are the automatic actions associated with the Distillate Pumps?

A
  • Start upon Distillate Condenser level high.
    o This ensures there’s enough distillate to provide to the system for BAC pump seal cooling and flushing.
  • Trip on Distillate Condenser sump level Lo-Lo to protect them from cavitation.
56
Q

What is the power supply for the Distillate Pumps?

A

NH

57
Q

What is the purpose of the BAC Distillate Cooler?

A

Removes heat from the distillate to protect downstream components since there is no cooling of the distillate in the Distillate Condenser, only phase change.

58
Q

What is the design of the BAC Distillate Cooler?

A

4-pass shell and tube HX with NC on the shell side. The max outlet temp of distillate is 130° F

59
Q

How does Ovation interact with the BAC?

A

A single Control Cabinet in the Radwaste Control Room contains , Drops 41/91, and
all I/O Modules required for the operation of the BAC.
Two Thin Clients are installed for monitoring and operation of the BAC.

My NLIT (18 decks)

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