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ATR SRO Level of Knowledge > High Pressure Demineralized Water (HDW) System > Flashcards

High Pressure Demineralized Water (HDW) System Flashcards

TRA00109

1
Q

Draw the HDW System One-Line Diagram.

A
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2
Q

Describe the location of the HDW Equipment Room

A
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3
Q

What are the power supplies for HDW Pump M-35?

A

Powered by either:
1) 670-E-5 480V Commercial Bus ‘A’
2) 670-E-9 480V Diesel Bus

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4
Q

What are the power supplies for HDW Pump M-36?

A

Powered by either:
1) 670-E-7 480V Commercial Bus ‘B’
2) 670-E-9 480V Diesel Bus

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5
Q

What are the functions of the HDW System?

A

1) Transfer heat generated by Loop equipment to the UCW.
2) Provides a radiological barrier between the contaminated loop and the clean UCW.

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6
Q

How are most HDW system evolutions controlled?

A

HDW pumps are controlled and system parameters monitored from the DCS.

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7
Q

Where is the majority of HDW equipment located in ATR?

A

HDW Room Northeast 2nd Basement

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8
Q

What HDW equipment is located in the HDW Room?

A

1) Circ pumps M-35/36
2) HXs M-33/34
3) HDW Pressure control equipment
4) Expansion Tank M-37
5) Chemical Addition Equipment
6) Drain Collection equipment

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9
Q

What electrical power is supplied to the HDW circulating water pumps?

A

Each pump has both 480V Diesel and Commercial power available.

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10
Q

What is the normal HDW Pump configuration to support reactor operations?

A

Running pump selected to diesel source.
Standby pump selected to commercial source.

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11
Q

From where is the automatic standby pump feature selected?

A

Standby is selected from the DCS in the RCR.

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12
Q

What parameter will initiate start of the standby HDW pump?

A

Low pump discharge pressure of 175 psig.

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13
Q

What type of HX are used in HDW?

A

Horizontal U-tube heat exchangers.

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14
Q

What materials were used in the construction of the HDW heat exchangers?

A

Carbon steel for the shell and SS for the tubes and tube sheets.

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15
Q

What water flows through the HDW HX tubes?

A

HDW water.

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16
Q

What water flows through the HDW HX shells?

A

UCW or Well Water.

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17
Q

How is the temperature of the HDW system controlled?

A

Adjusting the UCW flow through the HX shell.

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18
Q

HX M-34 feeds which HDW loop?

A

100F Supply Loop

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19
Q

What loop equipment is cooled by the 100F Supply loop?

A

1) Loop pump bearings, rotor, and standards.
2) Loop purification coolers.

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20
Q

What HX supplies the HDW 130F Supply Loop?

A

M-33 HX

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21
Q

What loop equipment is cooled by the HDW 130F Supply Loop?

A

Loop primary HXs.

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22
Q

What are the functions of the HDW Expansion Tank M-37?

A

1) Accommodate volume changes.
2) Dampen pressure surges.
3) Maintain constant pump suction pressure.

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23
Q

What is the pressure source to the HDW Expansion Tank?

A

High pressure air is added to the partially filled tank.

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24
Q

How is level controlled in the HDW expansion tank M-37 in AUTO mode?

A

1) DCS adds water by way of the HDW Booster Pump M-221 to increase level.
2) DCS bleeds water by opening drain valve LCV-7-2B to reduce level.

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25
Q

How is level controlled in the HDW Expansion Tank M-37 in MANUAL mode?

A

1) Level raised with manual control over M-221 Booster Pump
2) Process Operators lower the level by opening the bypass valve around LCV-7-2B.

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26
Q

How can HDW Booster Pump M-221 be operated manually?

A

1) Start switch on local control panel (670-E-107)
2) DCS from RCR

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27
Q

What are the HDW Booster Pump M-221 auto start and stop level setpoints in the DCS?

A

Start at 40%
Stop at 50%

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28
Q

What is the power supply to HDW Booster Pump M-221?

A

480V Diesel from 670-E-107

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29
Q

What is the makeup water source for the HDW system?

A

LDW

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30
Q

How does drain valve LCV-7-2B respond to a loss of instrument air?

A

LCV-7-2B closes on loss of air.

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31
Q

At what expansion tank level does LCV-7-2B open/close?

A

Open at 60%
Close at 48%

32
Q

Where does the HDW water go when drained from LCV-7-2B?

A

30 gallon drain collection tank.

33
Q

How is expansion tank pump suction pressure controlled?

A

High pressure air added or bled from expansion tank.

34
Q

How is the HDW system pressure controlled?

A

Pressure control valve PCV-7-1.

35
Q

Where is the system pressure control valve PCV-7-1 located?

A

Northeast corner of ATR’s 2nd basement just outside the HDW room.

36
Q

How will PCV-7-1 fail on loss of air?

A

PCV-7-1 fails closed.

37
Q

How does PCV-7-1 control supply pressure to the loops?

A

Opens to divert some of the discharge flow to the return header.

38
Q

At what discharge pressure does PCV-7-1 maintain the HDW system?

A

200 psig

39
Q

What would happen if too much HP air were added to the HDW expansion tank M-37?

A

1) Pump suction pressure would increase as will discharge.
2) PCV-7-1 would open more in reaction to the increased pump discharge pressure.
3) More supply flow would be diverted back to the return header.
4) Loop heat loads will be starved of necessary cooling.

40
Q

Normal operating parameters for 130F Loop of HDW?

A

Flow - 650 GPM
Temp - Supply 98F Return 107F
Pressure - 200 psig

41
Q

Normal operating parameters for 100F Loop of HDW?

A

Flow - 300 GPM
Temp - Supply 82F Return 92 F
Pressure - 200 psig

42
Q

What is HDW return header temp?

A

102F

43
Q

Describe normal HDW system configuration.

A

1) Circulating pumps: one running with other in standby
2) Two heat exchangers online
3) UCW cooling flow valve to the shell side of both HXs

44
Q

Draw UCW flow path to HDW Heat Exchangers

A
45
Q

Where is drainage from HDW collected?

A

HDW Drain Collection Tank M-152.

46
Q

What two disposal paths were designed into HDW system?

A

Cold waste and hot experimental waste

47
Q

Where is all HDW waste sent?

A

Loop 2A-C Hot Experimental Waste System

48
Q

What is the electrical power available to the two drain collection tank pumps?

A

480V Commercial from Control Panel 670-E-122.

49
Q

Where is the Drain Collecting Pump control panel 670-E-122 located?

A

HDW Room pillar next to waste collection tank and pumps.

50
Q

What are the basic components to the HDW Chemical Addition system?

A

1) Chemical Feed Tank M-38
2) Chemical Addition Pump M-39

51
Q

What chemical is used in the HDW system?

A

Molybdate based corrosion inhibitor (Corrshield 736).

52
Q

Why are chemicals added to the HDW System?

A

To prevent corrosion of carbon steel components and piping.

53
Q

What type of pump is used in the chemical addition system?

A

PDP

54
Q

What is the power supply to the chemical addition pump E-39?

A

120V Commercial from LP-10 (670-E-50)

55
Q

Why does the HDW system operate at a lower temperature than designed?

A

The system was designed to cool 9 experimental loops and only 6 are in service.

56
Q

What are the possible causes of HDW High Heat Exchanger Temps?

A

1) Low UCW Flow
2) High UCW Temperature
3) Heat load to UCW too high
4) Heat exchanger fouling

57
Q

What actions are prescribed by RCRAUX-3-31/32 for high HDW HX Temp?

A

1) Check UCW flow and start standby UCW pump
2) Check UCW temp and increase cooling tower fans
3) If both UCW pumps are inop assure secondary coolant is supplying HDW/UCW HXs.

58
Q

What are the possible causes of HDW Pump pressure abnormal?

A

1) High or low Expansion Tank Pressure
2) PCV-7-1 Not controlling
3) Circulating pump or motor failure
4) Loss of instrument air
5) Loss of operating pump selected power supply

59
Q

What actions are prescribed by RCRAUX-3-33 for HDW pressure abnormal?

A

1) Check circulating pump status and start standby
2) Select failed pump to alternate power and start
3) Check PCV-7-1 for correct operation
4) Check expansion tank pressure and adjust

60
Q

What are the possible causes of HDW Expansion Tank level abnormal?

A

1) Booster pump makeup controller failure
2) Faulty drain valve LCV-7-2B Operation
3) Circulating pump or motor failure
4) Excessive water usage.

61
Q

What actions are prescribed by RCRAUX-3-34 for HDW Expansion tank level abnormal?

A

1) Check tank level
2) Check system for leaks
3) Check for increased HDW usage
4) Check instrument air.

62
Q

What are the possible causes of HDW Expansion Tank Pressure abnormal?

A

1) HP Air valves leaking by
2) Expansion Tank vent valves leaking.

63
Q

Describe HDW system response to loss of Instrument Air.

A

1) Exp Tank LC Instrument LT-7-2 will lose air pressure to the I/P converter, giving a false empty reading to DCS and cause booster pump to start.
2) Exp tank lvl Control valve LCV-7-2B fails closed (system won’t drain)
3) PCV-7-1 will fail closed. System pressure to loop equipment will increase to pump discharge pressure.

64
Q

What pressurized water loop equipment will lose cooling water on a loss of HDW?

A

1) Loop Primary HXs
2) Loop purification Coolers
3) Loop Primary Circulation Pumps
4) 1C-W Sample Cooler

65
Q

Give Immediate Action for complete loss of HDW.

A

1) IF complete loss of HDW AND
2) IF HDW low low flow alarm from non-RTD pump AND
3) Bearing temp HI is received THEN
Verify SCRAM
Turn OFF primary coolant pump not selected for RTD

66
Q

What must be done to mitigate IA loss to HDW?

A

1) select M-221 to MANUAL and STOPPED at control panel.
2) Place HDW makeup on LDW pressure
3) Use local expansion tank sight glass for level control

67
Q

What must be done should both HDW Waste Collection pumps fail?

A

Waste must be directed to the Warm Drain System.

68
Q

What ramifications are there to directing HDW to the Warm Drains?

A

HDW waste is high conductivity water and will deplete the Warm Waste Treatment facility ion exchange beds.

69
Q

What systems are directly affected by the loss of HDW system?

A

ATR experiment loops.

70
Q

What critical loop equipment is cooled by HDW?

A

1) Loop Primary Circ Pumps
2) Loop Primary HXs
3) Loop Purification Coolers

71
Q

What affect does loss of HDW have on Loop Purification System?

A

Loop resin may be damaged by excessive heat.

72
Q

What must an experiment operator do upon loss of HDW?

A

1) Secure electrical power to loop heaters.
2) Direct loop flow to bypass the HX
3) Isolate purification flow.

73
Q

How is the HDW cooled when the UCW system is not available?

A

Well water can be directed to M-33 and M-34 HXs

74
Q

Where are relief valves located on the HDW system?

A

Expansion tank
Chemical addition pump discharge
HDW circulation pump discharge

75
Q

Where are rupture discs installed in line with a relief valve?

A

Expansion tank

76
Q

What pressure value are the relief valves set to lift?

A

240 psig

77
Q

How are the two HDW HXs protected against overpressure in the UCW system?

A

A rupture disc and relief valve are installed on each set to 125 psig.

ATR SRO Level of Knowledge (4 decks)

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