Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

My NLIT > SP-Spray Ponds > Flashcards

SP-Spray Ponds Flashcards

1
Q

During normal op, what auxiliary systems does the Spray Ponds support?

A

Emergengy Diesel Generators
Essential Cooling Water

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

What does Essential Cooling Water (EW) Cool?

A

Essential Chillers, Shutdown Cooling HX, Fuel Pool Cooling, and Nuclear Cooling Water

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

During emergency op what are the Spray Ponds used for?

A

Ultimate Heat Sink (UHS)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

Function: How does the Spray Pond system transfer heat loads? What system?

A

From essential cooling water and Diesel Generator coolers to atmosphere via UHS

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

What is the function of the UHS?

A

To provide sufficient cooling after a DBA LOCA

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

How does the Spray Pond system maintain chemistry?

A

By filtration, chemical addition, blowdown, and mixing.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

What is the design of the Spray Pond system?

A

Two Trains with: Spray Pond, Spray Pond Pump, 20x4 spreay headers, ea w/ 4 nozzlles for a total of 320 nozzles, Filtration equipment, and chemical addition.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

What is the Spray Pond capacity?

A

Seismic Cat 1 Essential Spray Pons are built for 13 days of capacity. With ponds cross connected 26 days of capacity.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

What is the Mission Time for the spray ponds?

A

Inventory 26 days
components 30 days

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

What heat exchangers does the spray pond cool?

A

DG Air Intercoolers, DG jacket Water HX, DG Lube oil HX, and Essential Cooling Water HX.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

Where does the spray pond cooling water flow in a shell and tube HX?

A

In the tube side it is then returned to the pond it came from and gets sprayed in the air where some evaporates.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

What is the purpose of the spray pond filter pump?

A

Pumps is always running SP through the chemical treatment system.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

What is the flow path of the spray pond filter pump?

A

Most flow goes through 3 filters and back to pond. 15 gpm flow to the SP recirc pumps through chemical addition header.
15-25 gpm goes to circ water canal for feed and bleed.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

Where does makeup water to the spray ponds come from?

A

Domestic Water
Cooling Tower Makeup Makeup & Blowdown.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

What is the purpose of the spary ponds?

A

Provide cooling for their train of EW and DG and dissipates heat to the atmosphere.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

What is the operation of the spray ponds?

A

They are seismic cat 1 reinforced concrete. Each is about 350ft x 170ft and 15 feet deep

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

What is the operation of the spray ponds?

A

They are seismic cat 1 reinforced concrete. Each is about 350ft x 170ft and 15 feet deep to support:
heat load requirements, NPSH, operating range and instrument uncertainty, and wind caused wave action.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

What modification did we make to SP for flow margin recovery?

A

We have a bypass valve that is normally locked closed. When a LOCA is initiated we will run water straight into pond and bypass spray nozzle for the 1st 6 days. After we close the valve.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

Describe the purpose of the spray pond pumps?

A

Circulates water from the spray pond through their respective train of safety HX and back to the spray pond spray nozzles.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
20
Q

How does an essential spray pond pump operate?

A

One in each flow train. Wet-pit, CP, rated flow 16,000 gpm. Pump is above concrete sumps with screens and possible stop gates to keep debris out.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
21
Q

How is the Spray Pond Pumps started?

A

Manually from the Control Room.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
22
Q

What is the power supply for the Spray Pond Pumps?

A

Class 1E 4.16kV

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
23
Q

What are the spray pond pump pre-start checks?

A

Before manually starting pump: Motor upper & lower bearing oil level satisfactory, Motor space heaters energized, and motor/pump coupling intact.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
24
Q

What are the spray pond pump post-start checks?

A

Motor upper & lower bearing oil level, motor/pump coupling, pump house exhaust fan running.

25
Q

What Engineered Safety Features Actuation System Signals for the spray pond pumps to automatically start?

A

DG start, SIAS, CSAS, CRVIAS, CREFAS, AFAS 1, AFAS 2, and a LOP

26
Q

What is the spray pond feed and bleed process?

A

Helps to remove Total Dissolved Solids (TDS)

27
Q

What are the main and backup water sources for the Spray Ponds?

A

Domestic Water (DS)-has more calcium by less biological activity. (29 days/mo)
Cooling Tower Makeup and Blowdown (TB)-less calcium, but more biological activity (1day/mo)

28
Q

How many days can the Spray Ponds supply safe shutdown flow?

A

26 days

29
Q

Where does the bleed water from the Spray Ponds go?

A

Circulating Water Intake Canal (CW) as directed by chemistry department.

30
Q

What is the purpose of the Spray Pond Filter Pumps?

A

Circulated water through the spray pond filtration and chemical addition subsystems.

31
Q

What is the design of the Spray Pond Filter Pump?

A

Horizontal CP 1200 GPM at 150 psig located above the level of the spray pond. They are self primed b4 start. Start/Stop handswitch. Low level in associated pond will auto stop the pump.

32
Q

What is the purpose of the Spray Pond Filters?

A

Remove particulate from the spray ponds.

33
Q

What is the design of the Spray Pond Filters?

A

Three, 50% capacity, sand & anthracite, 2 maintained in service. Most of the spray pond filter pumps discharge goes to the spray pond filter head tank.

34
Q

What are the two main modes of the Spray Pond Filters?

A

Filtraton: straining particulates through the granular media filter bed.
Cleaning (backwashing): When predetermined d/p is reached filtration stops and an auto backwash occurs. Backwash goes to spray pond backwash sump.

35
Q

What is the function of the air blower in the spray ponds?

A

Pneumatically op valves control the mode of operation for each filter.
Adds air to scour filter media in cleaning mode.

36
Q

What is the purpose of the Spray Pond Backwash Sumps and Pumps?

A

They pumps and empty from either SP overflow via the SP weir Or the Sp Filter Backwash.

37
Q

What is the design of the SP Backwash Sumps?

A

Adjacent to the each Essential Spray Pond to receive overflow.

38
Q

What is the design of the SP Backwash Pumps?

A

Only 1/2 lined to power (NH) manually swtch at MCC, vertical, CP, wet-pit, mounted in ea backwash sump, 1000 gpm, discharged to SP Bleed Line to CW Canal.

39
Q

How is the SP Backwash Sump Pumps Controlled?

A

Auto-auto start on hi level in sump auto stop on lo
Stop-the pump will not start
Start-pump will run an not turn itself off at lo level.

40
Q

What is the purpose of the SP Corrosion Test Racks?

A

Monitor the corrosive effect of the spray pond water on the piping and HX throughout the flow path.

41
Q

What is the design of the SP Corrosion Test Racks?

A

Installed in discharge of the SP pump, and SP filter pump. Coupons made of materials that mimic piping checked to estimate quality of components in the flow path.

42
Q

What is the purpose of the Spray Pond Crosstie Valves?

A

Provide isolation between ‘A’ and ‘B’ ponds. During single pond operation tie can be opened for long term cooling creating the UHS.

43
Q

What is the design of the Spray Pond Crosstie Valves?

A

10” butterfly , op by reach rods, normally locked closed to keep SP independent. In a LOCA and loss of makeup water 1) if 2 trains SDC in service one must be shutdown. 2) at least 1 S crosstie valves must be open.

44
Q

What is the minimum level the SP can be before we are outside of Tech Specs?

A

94 feet (92’ 6” to bottom + 1’ 6” minimum pump op level)

45
Q

How will the loss of the Spray Pond system impact the op of the plant?

A

SP is safety related if we lose 1 or 2 trains we would have to shutdown due to tech specs. If the DG running it would overheat. Full load 2.6 mins, unloaded 15 mins. Also SDC and Essentail Chilled Water (EC) would be unavailable.

46
Q

What powers Spray Pond Pumps?

A

PB 4.16 kV

47
Q

What powers Spray Pond House Exhaust Fans?

A

PH Class 480 VAC MCC

48
Q

What powers SP Pump Motor Space Heater, SP Filter Pumps, SP Filter Air Blower, SP Backwash Sump Pumps?

A

NH Non Class 480 VAC MCC

49
Q

What chemical does water resources pump into the Spray Ponds?

A

Sodium Hypochlorite via the hypo header

50
Q

Where does the Spray Pond Filter Backwash Sump Pumps and Spray Pond Blowdown line discharge?

A

Circulating Water (CW)

51
Q

What does the Spray Pond cool in the DG?

A

When the DG running SP cools air intercoolers, jacket water HX, and LO HX.

52
Q

What is the primary makeup water source to the Spray Ponds?

A

Domestic Water (DS) usually supplies makeup 29 days out of the month.

53
Q

What is the cooling source for EWHX?

A

Spray Pond Pumps supply water to EWHX which then remove heat from the SDCHX and Essential Chillers.

54
Q

How do we use Instrument Air in the Spray Pond?

A

For level detection and indication.

55
Q

What is the alternate makeup water supply for the Spray Ponds?

A

Cooling Tower Makeup and Blowdown (TB) Usually only 1 day a month.

56
Q

When does the Spray Pond Pump House Exhaust Fans turn on and off?

A

Turns on when the associated pump turns on and turns off 5 minutes after the pump stops.

57
Q

What is the Tech Spe for the Essential Spray Pond System (ESPS)?

A

Two ESPS shall be operable
(pumps, piping, valves, instrumentation, HX, etc.

58
Q

What is the Tech Spec for the Ultimate Heat Sink (UHS)?

A

The UHS shall be operable
(26 days, 89*F, 12’ usable water + 1’6” npsh),

59
Q

How does Algae effect the operablity of the Essential Spray Pond?

A

Total Organic Carbon (TOC) Deemed that planktonic/sessile algae doesn’t effect SP, but we try to keep levels low. Blue-Blue/green is okay but dark green is an algae bloom.

My NLIT (18 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions