SP- Spray Ponds Flashcards
Purpose of the Spray Pond [SP]?
[EW] Essential Cooling Water &
[DG] Diesel Generator heat removal to atmosphere during normal or emergency plant shutdown
How long are are the Spray Ponds [SP] built to reject heat (storage inventory)? When they are cross connected?
13 days - normal or emergency operations
26 days of storage capacity
What are the six chemicals added to the Spray Pond System and their purpose?
Hypochlorite – minimize biological growth
Biocide – minimize biological influenced corrosion
Sulfuric Acid – for pH control/minimize corrosion
Copper Corrosion Inhibitor – minimize system corrosion
Mild Steel Corrosion Inhibitor – minimize system corrosion
Dispersant – provides colloidal suspension for scale and deposit control
What system provides hypochlorite to the SP system?
Chlorine Injection system (CI)
What systems can provide makeup water to the spray ponds?
DS, TB, or Fire Protection as a backup
What directs the use of DS or TB as makeup water?
Chemistry Control Instruction
What would a loss of Instrument Air have on the SP system?
Level indication will have to be obtained locally at the Spray Ponds
What seismic category does the Spray Pond fall under?
Category 1
How many spray headers are provided in each pond?
Four
How many spray nozzles per pond?
320
How can we back-fill spray pond piping?
Utilize a bypass header that allows 100% of the SP system flow to enter the spray ponds without passing through the spray nozzles
Concerning our two makeup sources for the spray pond, DS and TB, how do they differ in calcium concentration and biological activity?
DS has more calcium but less biological activity
TB has less calcium, but more biological activity
What are the Spray Pond Pumps rated for?
16300 gpm
How can I start the Spray Pond pumps manually?
From the control room or the supply breaker
What system provides power to the Spray Pond pumps?
PBA-S03 for ‘A’
PBB-S04 for ‘B’
When would the Spray Pond pumps automatically start?
DGSS, SIAS, CSAS, Control Room Ventilation Isolation Actuation Signal (CRVIAS), Control room Essential Filtration Actuation Signal (CREFAS), AFAS, and LOP, load shed
When a Spray Pond pump starts, what else starts with it? Why?
Spray Pond pump house Exhaust Fan to ensure pump operability
What is the purpose of the Spray Pond Filter Pump?
To maintain Essential Spray Pond water within chemistry specifications
What is the capacity of the Spray Pond Filter pump?
1200 gpm
What system powers the Spray Pond Filter pumps?
NH
What would automatically stop the Spray Pond Filter Pump?
Low level in the associated spray pond (13’ 7.5”)
What sort of electrical protection do I have for the Spray Pond Filter pump?
Overcurrent
If silica rates are high in the Spray Ponds, what can I perform for chemistry control?
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
What type of filter is the [SP] Filter?
-Gravity fed
-sand filters
What is the capacity of each Spray Pond Filter?
600 gpm
How are backwashes performed on the Spray Pond Filters?
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
What provides power to the SP Backwash Sump Pump? Capacity?
NH
1000 gpm
When would the SP Backwash Sump Pump auto start?
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.
What electrical protection is provided for the SP Backwash Sump Pump?
Overcurrent
What is the purpose of the SP Corrosion Test Racks?
Installed to monitor the corrosive effect of the Spray Pond water on piping and heat exchanger
Where are the SP Corrosion Test Racks located?
in each spray pond pump house
What is the normal position of the Spray Pond Crosstie valves? Why?
Normally locked closed to ensure the two ponds remain independent of each other
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?
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
What effect would a loss of Spray Pond system have on the operation of the plant?
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
What is the purpose of the Spray Pond Chemical Addition system?
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
Describe the flowpath for hypochlorite addition to the Spray Ponds
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
What are the flow rates of the three automatic air operated Hypo injection valves? The two manual valves?
5, .5, and .25 gpm
.5 and 10 GPM
Of the three automatic air hypo injection valves, which one can be used in manual?
.25 gpm Hypo valve
What is the controller for the chemical addition system?
Human Machine Interface
What alarms are associated with the chemical addition system?
Yellow alarm indicates an
HMI alarm
High and low level on tanks
Any non-normal condition from the PLC (Program Logic controller)
Which SP pump does not require being primed prior to starting the pump?
Unit 3 B pump
At what level does the Spray Pond overflow into the sump?
14’ 5”
What is the minimum Spray Pond level for SP pump operation?
1’ 6”
How many feet of usable volume must be In the Spray Pond per tech spec?
12’
How are Total Dissolved Solids removed from [SP]?
feed and bleed
Who is responsible for maintaining [SP] level?
AO
If the SP backwash sump pumps are in hard start, will they shut off on a low level?
no
What is the tech spec relating to the essential spray pond system?
Two trains of the ESP system must be OPERABLE
What is the tech spec related to the Ultimate heat sink?
UHS must be OPERABLE
12’ of usable volume with SPs combined
What prevents undesired chemical interactions in the SPs?
HMI software interlocks
Will the SP pump start if the sodium hypochlorite high rate flow control valve is open?
no
What is the only chemical that can be added in conjunction with any other chemical?
sulfuric acid
How many gallons can the storage tanks hold for dispersant, CCI, MSCI and biocide?
1000 gallons
What is the capacity of the chemical addition pumps on the SP pump skid?
18 GPH
What other motive force component must be in operation for the SP Chemical addition pumps to operate?
recirculation pump
How does sodium hypochlorite enter the SPs?
through 5 injection points
two manual valves and three auto vales
What is the capacity of the acid chemical storage tank? What is the capacity of the acid injection pumps?
2500 gallons
6 gph
What is the window around the trigger time for the HMI to inject chemicals into the SPs?
three hours (two hours before and one after)
