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NLO Systems > SP- Spray Ponds > Flashcards

SP- Spray Ponds Flashcards

1
Q

What is the purpose of the Spray Pond System?

A

Removes heat from Essential Cooling Water during normal or emergency shutdown of the plant

Removes heat from the DG when a DG is running

Rejects heat to atmosphere

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2
Q

How much storage capacity are the Essential Spray Ponds built for? How would that change if I cross connected the spray ponds?

A

13 days during normal or emergency operations

Cross connected, a single spray pond train would have 26 days of storage capacity

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3
Q

What are the six chemicals added to the Spray Pond System and their purpose?

A

Hypochlorite – minimize biological growth, also raises SP pH as side effect

Biocide – minimize biological induced corrosion

Sulfuric Acid – lowers pH to specifically minimize corrosion and scale

Copper Corrosion Inhibitor – minimize system corrosion with film to protect hx, added during SP operation

Mild Steel Corrosion Inhibitor – minimize system corrosion

Dispersant – provides colloidal suspension for scale and deposit control to ease filtering

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4
Q

What system provides hypochlorite to the SP system?

A

Chlorine Injection system (CI)

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5
Q

What systems can provide makeup water to the spray ponds?

A

DS, TB, or Fire Protection as a backup

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6
Q

What directs the use of DS or TB as makeup water?

A

Chemistry Control Instruction

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7
Q

What would a loss of Instrument Air have on the SP system?

A

Level indication will have to be obtained locally at the Spray Ponds

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8
Q

What seismic category does the Spray Pond fall under?

A

Category 1

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9
Q

How many spray headers are provided in each pond?

A

Four

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10
Q

How many spray nozzles per pond?

A

320

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11
Q

How can we back-fill spray pond piping?

A

Utilize a bypass header that allows 100% of the SP system flow to enter the spray ponds without passing through the spray nozzles

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12
Q

Concerning our two makeup sources for the spray pond, DS and TB, how do they differ in calcium concentration and biological activity?

A

DS has more calcium but less biological activity

TB has less calcium, but more biological activity

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13
Q

What are the Spray Pond Pumps rated for?

A

16300 gpm

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14
Q

How can I start the Spray Pond pumps manually?

A

From the control room or the supply breaker

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15
Q

What system provides power to the Spray Pond pumps?

A

PBA-S03 for ‘A’

PBB-S04 for ‘B’

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16
Q

When would the Spray Pond pumps automatically start?

A

DGSS, SIAS, CSAS, Control Room Ventilation Isolation Actuation Signal (CRVIAS), Control room Essential Filtration Actuation Signal (CREFAS), AFAS, and LOP, load shed

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17
Q

When a Spray Pond pump starts, what else starts with it? Why?

A

Spray Pond pump house Exhaust Fan to ensure pump operability

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18
Q

What is the purpose of the Spray Pond Filter Pump?

A

To maintain Essential Spray Pond water within chemistry specifications

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19
Q

What is the capacity of the Spray Pond Filter pump?

A

1200 gpm

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20
Q

What system powers the Spray Pond Filter pumps?

A

NH

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21
Q

What would automatically stop the Spray Pond Filter Pump?

A

Low level in the associated spray pond (13’ 7.5”)

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22
Q

What sort of electrical protection do I have for the Spray Pond Filter pump?

A

Overcurrent

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23
Q

If silica rates are high in the Spray Ponds, what can be used for chemistry control?

A

Feed and Bleed – a line from the discharge of the Spray Pond Filter Pump sends water from the Spray Pond to the CW intake canal at a flow rate directed by Chemistry

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24
Q

What type of filter is the Spray Pond Filter?

A

Gravity type sand filters

25
Q

What is the capacity of each Spray Pond Filter?

A

600 gpm

26
Q

How are backwashes performed on the Spray Pond Filters?

A

Manually – Backwash valve opens and water from the upper area flows, by gravity and eduction, backward through the sand, removing accumulated debris out through the backwash valve to the backwash sump

27
Q

What provides power to the SP Backwash Sump Pump? Capacity?

A

NH

1000 gpm

28
Q

When would the SP Backwash Sump Pump auto start?

A

With local control switch in AUTO, they will automatically start upon a receipt of a backwash sump high level signal and automatically stop upon receipt of a low level signal.

29
Q

What electrical protection is provided for the SP Backwash Sump Pump?

A

Overcurrent

30
Q

What is the purpose of the SP Corrosion Test Racks?

A

Installed to monitor the corrosive effect of the Spray Pond water on piping and heat exchanger

31
Q

Where are the SP Corrosion Test Racks located?

A

in each spray pond pump house

32
Q

What is the normal position of the Spray Pond Crosstie valves? Why?

A

Normally locked closed to ensure the two ponds remain independent of each other

33
Q

If there is a LOCA and makeup is lost to the Spray Ponds, what two actions must be taken and how long do I have to complete them?

A

If two trains of shutdown cooling are in service, then one train must be shutdown

At least one of the spray ponds crosstie valves must be open

24 hours

34
Q

What effect would a loss of Spray Pond system have on the operation of the plant?

A

If one or both trains becomes inoperable, plant shutdown would be required

If the associated DG is running, it would overheat so it would need to be shutdown

Impacts the operation of the Shutdown Cooling system, so actions are required to restore core cooling

35
Q

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

A

To maintain our Ultimate Heat Sink chemistry within specified parameters in order to optimize the heat transfer surfaces of the DG coolers and the EW heat exchangers

36
Q

Describe the flowpath for hypochlorite addition to the Spray Ponds

A

From WRF, hypo transports via a hypo header external to the protected area. Egress through the fence to the individual units and then to the spray pond distribution system

37
Q

What are the flow rates of the three automatic air operated Sodium Hypochlorite injection valves? The two manual valves?

A

Automatic:
0.25 gpm (filter pump running)
0.5 gpm (filter pump running)
5 gpm (filter pump secured)

Manual:
0.5 gpm (filter pump running)
10 GPM (filter pump secured)

38
Q

Of the three automatic air hypo injection valves, which one can be used in manual?

A

.25 gpm Hypo valve

39
Q

What is the controller for the chemical addition system?

A

Human Machine Interface

40
Q

What alarms are associated with the chemical addition system?

A

Yellow alarm indicates an HMI alarm

High and low level on tanks

Any non-normal condition from the PLC (Program Logic controller)

41
Q

Which SP pump does not require being primed prior to starting the pump?

A

Unit 3 B pump

42
Q

At what level does the Spray Pond overflow into the sump?

A

14’ 5”

43
Q

What is the minimum Spray Pond level for SP pump operation?

A

1’ 6”

44
Q

How many feet of usable volume must be In the Spray Pond per tech spec?

A

12’

45
Q

How are Total Dissolved Solids removed from SP?

A

feed and bleed

46
Q

Who is responsible for maintaining SP level?

A

AO

47
Q

If the SP backwash sump pumps are in hard start, will they shut off on a low level?

A

no

48
Q

What is the tech spec relating to the essential spray pond system?

A

Two trains of the ESP system must be OPERABLE

49
Q

What is the tech spec related to the Ultimate heat sink?

A

UHS must be OPERABLE

12’ of usable volume with SPs combined

50
Q

What prevents undesired chemical interactions in the SPs?

A

HMI software interlocks

51
Q

Will the SP pump start if the sodium hypochlorite high rate flow control valve is open?

A

no

52
Q

What is the only chemical that can be added in conjunction with any other chemical?

A

sulfuric acid

53
Q

How many gallons can the storage tanks hold for dispersant, CCI, MSCI and biocide?

A

1000 gallons

54
Q

What is the capacity of the chemical addition pumps on the SP pump skid?

A

18 GPH

55
Q

What other motive force component must be in operation for the SP Chemical addition pumps to operate?

A

recirculation pump

56
Q

How does sodium hypochlorite enter the SPs?

A

through 5 injection points

two manual valves and three auto valves

57
Q

What is the capacity of the acid chemical storage tank? What is the capacity of the acid injection pumps?

A

2500 gallons

6 gph

58
Q

What is the window around the trigger time for the HMI to inject chemicals into the SPs?

A

three hours (two hours before and one after)

NLO Systems (66 decks)

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