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Catawba Nuclear Station > Component Cooling System(KC) > Flashcards

Component Cooling System(KC) Flashcards

1
Q

What is the purpose of the Component Cooling System?

A
  1. Dissipate waste heat from motor coolers and intersystem heat exchangers serving various plant systems for all modes of operation.
  2. Serves as a boundary between the Reactor Coolant System(NC) and the Nuclear Service Water System(RN)
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2
Q

What types of chemicals are added to the Component Cooling System?

A
  1. Sodium Molybdate - corrosion inhibitor
  2. Tolytriazole(TTA) - copper corrosion inhibitor
  3. Sodium Tetraborate - pH control, reduces carbon steel corrosion
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3
Q

What hazards are associate with the chemicals in the Component Cooling Water?

A
  1. May cause eye, skin, and respiratory irritation, dermatitis, headache, nausea, and coughing
  2. If KC water touches exposed skin wash with water thoroughly
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4
Q

What is the purpose of the Component Cooling Water Surge Tank?

A
  1. Provides net positive suction head to the KC pumps

2. Acts as a surge volume for temperature changes

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5
Q

What is the purpose of the vent on the Component Cooling Surge Tank?

A
  1. Prevents drawing a vacuum in the surge tank on a “cold pump up” from the KC sump
  2. Prevents over pressurization of the surge tank if the thermal barrier heat exchanger were to fail allowing leakage into the KC system
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6
Q

What are the sources of makeup to the Component Cooling Surge Tank?

A
  1. KC sump pump discharge
  2. YM (manual makeup) is the normal source
  3. RN (assured source)
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7
Q

What is the affect on the Component Cooling System if there is a Surge Tank Lo Lo Level, and what is the setpoint?

A
  1. The Reactor Building and Auxiliary Building Non-Essential Header isolation valves will close(train related)
  2. 34%
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8
Q

What is the design/purpose of the Component Cooling Pumps?

A
  1. Normal flow is 5000gpm
  2. Normal discharge pressure is 100psig
  3. Normally one pump is in service
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9
Q

What are the power supplies to the Component Cooling Pumps?

A

ETA and ETB

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10
Q

What is the minimum flow requirement of the Component Cooling Pumps?

A

1100gpm

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11
Q

What will cause the Component Cooling Pumps to automatically start?

A
  1. Safety Injection(train related)

2. Blackout(train related)

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12
Q

What will cause the Component Cooling Pump Minimum Flow Valve to automatically operate?

A
  1. Opens automatically if flow lowers to 3150gpm

2. Closes automatically when flow raises to 5800gpm

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13
Q

What is runout flow for a Component Cooling Pump and how does that affect Minimum Flow Valve operation?

A
  1. Runout flow for one KC pump is 5700gpm

2. Runout flow is lower than the closure setpoint of the min flow valve so it will have to be taken to close

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14
Q

What system provides the cooling water for the Component Cooling Heat Exchangers?

A

Nuclear Service Water(RN)

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15
Q

What is the setpoint for the Nuclear Service Water low flow alarm, and when is it active?

A
  1. Setpoint is less than 2200gpm
  2. Alarm is enabled following a Safety Injection signal is present with a 72 second time delay to allow the RN valve to stroke fully open.
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16
Q

What is the design/purpose of EMF-46A?

A
  1. Located at the outlet of the KC Heat Exchangers

2. Provides an alarm ONLY

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17
Q

What could cause a rise in Component Cooling System radiation levels?

A
  1. Leak from the reactor coolant system into the KC system

2. KC water activation

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18
Q

What are the loads on the Component Cooling Essential Header?

A
  1. ND heat exchanger
  2. ND pump mechanical seal
  3. ND, NI, CA, NS, and KC pump motor coolers
  4. NV pump bearing oil cooler
  5. NV pump speed reducer oil cooler
  6. NI pump bearing oil cooler
  7. Post Accident Liquid Monitor Sample Cooler
  8. Auxiliary Shutdown Panel A/C units
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19
Q

What is the only component on the Component Cooling Essential Header that’s normally isolated?

A

The ND Heat Exchanger inlet isolation valves are normally closed. The outlet valves are normally open.

20
Q

How many Essential Headers are there?

A

There are two essential headers per unit, one per train

21
Q

What are the loads on the Component Cooling Reactor Building Non-Essential Header?

A
  1. NCDT heat exchanger
  2. NV excess letdown heat exchanger
  3. RCP thermal barrier heat exchanger
  4. RCP upper bearing cooler
  5. RCP lower bearing cooler
22
Q

What is unique about the Thermal Barrier Heat Exchanger Valve arrangement?

A
  1. The piping and valves around that encompasses the thermal barrier heat exchanger are rated for NC system pressure to contain a leak
  2. The discharge valve from the thermal barrier heat exchanger will automatically close at a high flow of 60gpm, following a 30 second time delay to allow for normal transients
23
Q

What are the loads on the Component Cooling Auxiliary Building Non-Essential Header?

A
  1. Hydrogen recombiners
  2. Waste gas compressors
  3. Recycle evaporator package
  4. Seal water heat exchanger
  5. Spent fuel pool heat exchangers
  6. Spent fuel pool pump motor coolers
  7. Letdown heat exchangers
24
Q

Where can the Component Cooling Drain Sump Pump send water?

A
  1. KC surge tank
  2. Other unit’s sump
  3. Mix and settling tank
25
Q

What will cause the ND Heat Exchanger Inlet Valves to automatically open?

A
  1. Phase ‘B’ Isolation

2. Lo level in the FWST(20%) with Safety Injection

26
Q

What will cause the ND Heat Exchanger Outlet Valves to automatically open?

A
  1. Safety Injection(valves fail open)
  2. Loss of instrument air
  3. Auxiliary Shutdown Panel to LOCAL
27
Q

What is the normal position of the ND Heat Exchanger Outlet Valves, and why?

A

The heat exchanger outlet valves are set to 5000gpm, and since the inlet valves are normally closed the outlet valves will be fully open

28
Q

What will cause the Auxiliary Building Non-Essential Header Isolation Valves to automatically close?

A
  • The following are all train related*
    1. Phase ‘B’ Isolation
    2. Lo level FWST(20%) with Safety Injection
    3. Lo Lo Surge Tank Level(34%)
29
Q

What will cause the Auxiliary Building Non-Essential Header Isolation Valves to automatically open?

A

Train Related

Auxiliary Shutdown Panel to LOCAL(train pump running and surge tank greater than 34%)

30
Q

What will cause the Reactor Building Non-Essential Header Isolation Valves to automatically close?

A
  • The following are all train related*
    1. Phase ‘B’ Isolation
    2. Lo level FWST(20%) with Safety Injection
    3. Lo Lo Surge Tank Level(34%)
31
Q

What will cause the Reactor Building Non-Essential Header Isolation Valves to automatically open?

A

Train Related

Auxiliary Shutdown Panel to LOCAL(train pump running and surge tank greater than 34%)

32
Q

What will cause the Reactor Coolant Pump Isolation Valves to automatically close?

A

Phase ‘B’ Isolation(train related)

33
Q

What will cause the Reactor Coolant Pump Isolation Valves to automatically open?

A

Auxiliary Shutdown Panel to LOCAL(train related)

34
Q

What will cause the Thermal Barrier Heat Exchanger Isolation Valves to automatically close

A

Greater than or equal to 60gpm for 30 seconds

30 second time delay to prevent isolation on KC pump start/stop

35
Q

What will cause the Excess Letdown Heat Exchanger Isolation Valves to automatically close?

A

Phase ‘A’ Isolation

36
Q

What will cause the Excess Letdown Heat Exchanger Isolation Valves to automatically open?

A

Auxiliary Shutdown Panel to LOCAL

37
Q

What will cause the NCDT Heat Exchanger Isolation Valves to automatically close?

A

Phase ‘A’ Isolation

38
Q

What will cause the Component Cooling Drain Header Isolation Valves to automatically close?

A

Phase ‘A’ Isolation

39
Q

What is the Component Cooling System response to a Safety Injection signal?

A
  1. Train related pumps start

2. ND heat exchanger outlet valves open

40
Q

What is the Component Cooling System response to a Safety Injection signal with a low FWST level(20%)?

A
  1. Reactor Building non-essential header isolation valves close
  2. Auxiliary Building non-essential header isolation valves close
  3. ND heat exchanger inlet valves open
41
Q

What is the Component Cooling System response to a Phase ‘A’ Isolation signal?

A
  1. NCDT heat exchanger isolation valves close
  2. Excess letdown heat exchanger isolation valves close
  3. Reactor Building drain header isolation valves close
42
Q

What is the Component Cooling System response to a Phase ‘B’ Isolation signal?

A
  1. Reactor Building non-essential header isolation valves close
  2. Auxiliary Building non-essential header isolation valves close
  3. ND heat exchanger inlet valves open
  4. Reactor Coolant pump isolation valves close
43
Q

What is the Component Cooling System response to a Blackout?

A

Train related pumps start

44
Q

What is the Component Cooling System response to the Auxiliary Shutdown Panel taken to LOCAL?

A
  1. NCP supply and return valves - open
  2. Excess letdown heat exchanger isolation valves - open
  3. ND heat exchanger outlet valves - open
  4. With ‘A’ Train KC pump running the following occurs:
    A. RN inlet isolation to the ‘A’ KC heat exchanger - open
    B. Auxiliary Building an Reactor Building non-essential header isolation valves - open
    1. With ‘B’ Train KC pump running the following occurs:
      A. RN inlet isolation to the ‘B’ KC heat exchanger - open
      B. Auxiliary Building an Reactor Building non-essential header isolation valves - open
45
Q

What is the normal setpoint for the Component Cooling Heat Exchanger outlet?

Catawba Nuclear Station (72 decks)

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