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NLO - Systems > NC- Nuclear Cooling > Flashcards

NC- Nuclear Cooling Flashcards

1
Q

[NC]

Pump capacities
How many are normally in operation?

A

-2 pumps in parallel
-100%
-1/2

100-110 psig (17,500 gal/min)

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2
Q

[NC]

[NC] Pump power supply?

A

[NB]

‘A’ – NBN-S01 ‘‘B’ – NBN-S02

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3
Q

[NC]

What auto starts standby [NC] pump?

A

Pump discharge header pressure
79 psig

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4
Q

[NC]

How would the Control Room know if [NC] standby pump auto started?

A

Amber Light (Lit) in CR

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5
Q

[NC]

Which side does [PW] flow through on [NC] Hx (Tube or Shell?)

A

Tube Side

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6
Q

[NC]

To shift to standby Hx, what actions must be performed?

A

Vent on-coming Hx on both shell and tube side to ensure a filled condition.

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7
Q

[NC]

How do we manually adjust [NC] temperature?
What temperature band?

A

Temp Up - Open Flow Bypass Valve (bypassing Hx)

Temp Down - Close Flow Bypass Valve (more flow to Hx)

75-105*F

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8
Q

[NC]

Which system of the [NC] Hx, is at a higher pressure?

A

[PW]
to prevent potentially contaminated nuclear cooling water leakage into the PW system and environment

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9
Q

[NC]

[NC] Surge tank purpose? (4)

A

-Absorb fluxtuations in system due to temperature changes

-NPSH for [NC] pumps

-detecting leakage

-Location for adding makeup water

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10
Q

[NC]

Surge Tank location?
Capacity?

A

AB Roof (NE)

1000 gal

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11
Q

[NC]

Makeup water to [NC]?
What is it inserted into?

A

[DW] Demineralized Water
Surge Tank

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12
Q

[NC]

Backup makeup water source to [NC] ?
Where are the valves to align this back up make up source?

A

[CM] Chemical Waste System

100’ aux building, south wall

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13
Q

[NC]

Purpose of nitrogen in the Surge tank?

A

Cover gas -oxygen exclusion for corrosion

5 psig

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14
Q

[NC]

How are chemicals added to the system with th Chem Add Tank?

A

D/P with [NC] pump flush

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15
Q

[NC]

The NC Chem Add Tank is normally isolated. Besides adding chemicals, when would we align flow through it and why?

A

When Cold Weather Protection is in effect to prevent freeze damage

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16
Q

[NC]

What does RU-6 monitor?
Location?

A

[NC] in-leakage from the contaminated systems it cools
Turbine Building North Yard

Next to the [NC] pumps

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17
Q

[NC]

Letdown Hx TCV purpose?

A

Control [NC] flow thru Hx to auto regulate LDHx outlet temp setpoint by CR

NCN-TV-223 - (usually 120F) - AB 110’ above LDHx

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18
Q

[NC]

Why, as AO’s, should we worry about the flow of NC through the LDHX? What is the maximum NC flow rate through the letdown HXs?

A

Because it controls Letdown temperature and could ultimately affect reactivity

1500gpm

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19
Q

[NC] 10

What are the 8 Priority heat loads?

A

Normal Chillers

Nuclear Sample Coolers

CEDM Normal ACUs

[RC] RCP
Seal coolers
HP coolers
Thrust Bearing Coolers
Motor Air coolers
Lube Oil Coolers

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20
Q

[NC]

What is the purpose of the relief valve NCE-PSV-617?

A

Protect the containment NC return penetration from exceeding its design pressure rating after a LOCA

It protects the system between the inside and outside containment isolation valves

21
Q

[NC]

Why are we worried about overpressure in the penetration piping for the NC system between the inside and outside isolation valves?

A

The water trapped in the penetration piping could be heated by the conditions in the containment and the resulting expansion might rupture the piping and cause a loss of containment isolation

22
Q

[NC]

Why do we not have relief protection on the supply penetration piping for the NC system?

A

Because the inside containment valve is a check valve which would pass flow and therefore not allow any pressure accumulation in the piping

23
Q

[NC]

What is the purpose of relief valves protecting NC inside containment?

A

Protect the NC system piping inside the containment against over pressurization and potential damage in the event of leakage from a RCP seal cooler into the NC system in conjunction with a closure of the NC containment isolation valves

24
Q

[NC]

The setpoint for the NC inside containment relief valves is 135 psig. Why is that significant?

A

Low enough to require a special operating sequence for the NC motor operated containment isolation valves because isolation of the containment return path with the supply path still aligned can cause a pressure surge in the NC system that will lift the reliefs

25
Q

[NC]

What types of valves are on the supply and discharge lines through containment for NC? What would cause the NC supply and return containment isolation valves to automatically shut?

A

supply line- motor operated outside, check valve inside

return line- motor operated valves inside and outside containment

CSAS

26
Q

[NC]

What system provides a backup source of cooling water for NC system loads?

A

EW

27
Q

[NC]

If NC is lost to the RCPs, how long would I have to restore it?

A

10 minutes

3 minutes if its lost to more than one RCP

28
Q

[NC]

What temperature is NC maintained at and what is preferred?

A

Between 75F and 105F, but less than 85F is preferred

29
Q

[NC]

The PW T-mod was designed to cool NC when the heat load consists of what components?

A

One Spent Fuel Pool heat exchanger

Two Normal Chillers at 50% load

BAC at 40% load

LRS Evaporator at 50% load

AS Vent Condenser

30
Q

[NC]

What is the purpose of the NC system?

A

provide cooling during all modes of operation to the priority and non-priority loads

intermediate buffer volume between plant cooling water and potentially contaminated flow streams to reduce the probability of releasing radioactivity to the environment.

31
Q

[NC]

Why is the NC constantly monitored by a radiation monitor around the NC pumps?

A

due to the potential for leakage into the NC system from other radioactive systems

32
Q

[NC]

What protections does the NC surge tank have?

A

hi-lo level/pressure, level sight glass and controller, local temperature indicator, pressure relief and a vacuum breaker

33
Q

[NC]

What potential impacts on the plant does manually controlling letdown temperature?

A

too much NC flow, letdown too cool, boron absorbed, positive reactivity

too little NC flow, letdown too hot, boron released, negative reactivity

34
Q

[NC]

What are the NC “non-priority loads”?

A 
letdown hx
radwaste evaporator
boric acid concentrator
waste gas compressors
non-nuclear sample coolers
aux. steam vent condenser
gas stripper
aux. steam rad. monitor (ru-7) cooling coil
spent fuel pool cooling hx
35
Q

[NC]

What must be done prior to opening the EW-NC cross-tie valves?

A

close the NC non-priority load isolation valve

36
Q

Where is the NC non-priority load isolation valve located?

A

77’ aux. building unassigned room

37
Q

Where are the EW cross-tie to NC valves located?

A

70’ aux. building, shutdown cooling hx room

38
Q

Are the isolation valves to transfer EW to NC for the fuel pool hx make-before-break?

A

yes

39
Q

[NC]

In the NC system, what does NH power?

A

NC pump motor space heaters

CEDM ACU and normal chiller NC outlet valves

40
Q

[NC]

In the NC system, what does NK power?

A

NC surge tank make up solenoid valve

41
Q

[NC]

In the NC system, what does PH power?

A

NC containment isolation valves

42
Q

[NC]

What is the back up cooling water system for the shutdown cooling HXs?

A

NC

43
Q

[NC]

What is the back-up make-up system for the NC system?

A

CM

44
Q

[NC]

Which [NC] Hx is the [PW] T-Mod usually hooked to?

A

B

45
Q

[NC]

What status does cross-tying the EW to NC loads put the EW equipment in?

A

INOPERABLE

46
Q

[NC]

What happens when NC is lost to the WC system?

A

normal chillers trip

47
Q

[NC]

Are the NC supply and return line motor operated valves fail close or as is?

A

fail as is

48
Q

[NC]

What is the tech spec related to the NC system containment isolation valves?

A

must be able to close in 60 seconds

NLO - Systems (70 decks)

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