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Systems > Spray Pond Chemical Addition > Flashcards

Spray Pond Chemical Addition Flashcards

1
Q

What is the purpose of the Spray Pond Chemical Addition system ?

A

Used to maintain our ultimate heat sink chemistry in order to optimize heat transfer of DG Coolers & Essential Cooling Water HEX

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2
Q

What is the reason for adding Sodium Hypochlorite?

A

-Minimize bacteria & algae growth

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3
Q

Why is Sulfuric Acid added to Spray Pond ?

A

Adjusted pH to prevent scale & corrosion

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4
Q

Why is dispersant added to Spray Ponds?

A

Provides colloidal suspension of scale forming ions, silt,& algae, for ease in filtering

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5
Q

Why is Biocide added to Spray Pond ?

A

Added to minimize Microbiological Influenced corrosion

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6
Q

Why is Copper Corrosion Inhibitor (CCI) added to the Spray Pond ? What is negatively affected by ?

A

-Sodium Tolytriazole is a film forming anole that binds with copper to protect heat exchangers tubes
-Negatively affect by chlorine & UV light

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7
Q

Why is Mild Steel Corrosion Inhibitor(MSCI) added to Spray Pond ?

A

Maintains protective film in HEX from residual concentrations

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8
Q

When is Mild Steel Corrosion Inhibitor addition started/stopped ?

A

Started- 15 minutes before securing SP pump
Stopped- 30 minutes after pump has been secured

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9
Q

Why does HMI have software interlocks ?

A

The software interlocks prevent undesired chemical interactions

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10
Q

Are HMI interlocks still active when manually adding chemicals ?

A

No, they’re not active & this could cause mixing chemicals which leads to localized high concentrations of chemicals

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11
Q

What is the High Flow Rate Valve(FCV) interlocked with ?

A

It’s interlocked with Spray Pond pump to prevent valve from opening, while the SP pump is running

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12
Q

Why is the Hypo additions High Flow Rate Valve interlocked with SP pump ?

A

If SP pump is running while adding high flow rate hypo, could cause hypos being pumped through DG & Essential cooling HEX which could cause damage due to corrosion

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13
Q

What’re the HMI interlocks to prevent Sodium Hypochlorite from interacting with Dispersant,CCI,MSCI?

A

Prevents incompatible Chemical Addition Pumps from starting in AUTO when Hypo is being added via automatic valve

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14
Q

What is the interlock to prevent Hypo from coming into contact with other chemicals if one of the Incompatible Chemical Pumps is started MANUALLY?

A

HMI software will auto close hypo automatic valves if Incompatible Chemical Pump starts during hypo addition

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15
Q

What’re the HMI interlocks to prevent Biocide from interacting with Dispersant,CCI,MSCI?

A

Interlocks to prevent incompatible Chemical Addition Pumps from being started while in AUTO, if Biocide is being added

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16
Q

What is the HMI interlock if a incompatible Chemical Addition Pump is started MANUALLY,while Biocide is being added ?

A

Biocide pump will trip, IF incompatible Chemical Addition Pump is started MANUALLY

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17
Q

What’re the HMI interlocks to prevent Dispersant from interacting with Biocide, CCI, Hypo?

A

Interlocks prevents incompatible Chemical Addition Pumps from AUTO starting,& Hypo Automatic valves is opened, DURING Dispersant addition

18
Q

What does HMI interlock do when incompatible Chemical Addition Pump is started manually or Hype Automatic Valve is opened, DURING Dispersant addition ?

A

HMI interlock will trip Dispersant pump, IF incompatible Chemical Addition Pump is started manually OR Hypo automatic valve is opened

19
Q

When can CCI only be added to Spray Pond ?

A

Can only be added when associated SP pump is running

20
Q

What chemical is allows to be added with other chemicals ?

A

Sulfuric acid is only chemical allows to be added in conjunction with other chemicals

21
Q

How many gallons are the Dispersant, CCI, MSCI, & Biocide tanks ?

A

1000 gallons for each tank

22
Q

How does hanging lever detector work for the chemical tanks ?

A

It’s reverse indications as LVL does down with the float, it’ll pull the level indicator up higher

23
Q

How’re chemicals added to Chemical Tanks ?

A

Utilities load a barrel onto forklift raised above tank and a hose is installed to gravity feed to Chemical Tank

24
Q

How is the chemical fed to the associated Pump Skid ? What is the putout for each pump ?

A

-Chemical is gravity feed to two 18gph pumps for each spray pond

25
Q

What is the cylinder on the pump skid used for ?

A

It’s filled and aligned to either pump for pump capacity testing

26
Q

Where do the chemical pumps discharge to ?

A

They discharge into recirculation header

27
Q

Are the chemical pumps on each pump skid able to be cross connect to each others spray pond?

A

Yes

28
Q

What does the three position handswitch (Hand/Off/Off) on each chemical pump skid mean ?

A

Hand- Turns associated pump on &removes control from HMI PLC
Auto-Gives control of pump to HMI PLC
Off- Turns pump off & removes control from HMI PLC

29
Q

What helps mix chemical into the recirculation header ?

A

A quill is used to create turbulent flow in Recirc header, which is then dispensed into ponds

30
Q

What needs to be running for Chemical Addition pump to operate ?

A

Need Recirculation Pump must be running & aligned mechanically & electrically to be able to operate Chemical Addition Pump

31
Q

How many Recirc pumps are usually running ?

A

-Two are usually running aligned to each spray pond
-Third pump is a backup which can be aligned to either spray pond

32
Q

Where is Sodium Hypochlorite supplied from ? How is it transported ?

A

-Supplies to each unit from Water Resources
-Transports it through common header outside PA, which then it breaks off to each units common header, then the units common header is split into two headers

33
Q

What’re the 5 valve entry points for Hypo into its spray pond ? What’re the valves rated for ?

A

-Two manual valves
One rated for .5gpm flow rate
Other rates for 10gpm flow rate
Three automatic air operated valves
-Low flow rate .25gpm
-Medium Flow Rate .50
-High flow rate 5gpm

34
Q

What is different about Low Rate FCV than the other valves ?

A

Can also be operated via clutch & manual hand wheel

35
Q

How big is the acid chemical tank ?

A

2500gallons and it’s a double walled tank

36
Q

What does the Acid Chemical Tank feed ?

A

It feeds the Chemical Addition skids that has two pumps rated for 6gph & will discharge directly to SP

37
Q

What is the HMI PLC used for ?

A

It is used on the Spray Ponf Chemical Addition subsystem

38
Q

When must the schedule for the HMI PLC for the Chemical Addition system be verified by the area operator ?

A

-Must be verified by AO within 3 hour window
-Starting 2 hours before & end on hour AFTER Trigger Time for daily chemical addition

39
Q

What is the alarm associated with Chemical Addition system ?

A

A local yellow strobe & horn on outside of building

40
Q

What do the HMI alarm on, for the Chemical Addition system ?

A

-High & Low level on tanks
-Any non-normal condition from PLC
-Pump Skid level alarm

Systems (62 decks)

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