Component Cooling System(KC)

Question 1

What is the purpose of the Component Cooling System?

Answer 1

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)

Question 2

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

Answer 2

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

Question 3

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

Answer 3

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

Question 4

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

Answer 4

1. Provides net positive suction head to the KC pumps

2. Acts as a surge volume for temperature changes

Question 5

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

Answer 5

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

Question 6

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

Answer 6

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

Question 7

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

Answer 7

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

Question 8

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

Answer 8

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

Question 9

What are the power supplies to the Component Cooling Pumps?

Answer 9

ETA and ETB

Question 10

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

Answer 10

1100gpm

Question 11

What will cause the Component Cooling Pumps to automatically start?

Answer 11

1. Safety Injection(train related)

2. Blackout(train related)

Question 12

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

Answer 12

1. Opens automatically if flow lowers to 3150gpm

2. Closes automatically when flow raises to 5800gpm

Question 13

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

Answer 13

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

Question 14

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

Answer 14

Nuclear Service Water(RN)

Question 15

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

Answer 15

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.

Question 16

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

Answer 16

1. Located at the outlet of the KC Heat Exchangers

2. Provides an alarm ONLY

Question 17

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

Answer 17

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

2. KC water activation

Question 18

What are the loads on the Component Cooling Essential Header?

Answer 18

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

Question 19

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

Answer 19

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

Question 20

How many Essential Headers are there?

Answer 20

There are two essential headers per unit, one per train

Question 21

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

Answer 21

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

Question 22

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

Answer 22

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

Question 23

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

Answer 23

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

Question 24

Where can the Component Cooling Drain Sump Pump send water?

Answer 24

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

Question 25

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

Answer 25

1. Phase 'B' Isolation | 2. Lo level in the FWST(20%) with Safety Injection

Question 26

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

Answer 26

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

Question 27

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

Answer 27

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

Question 28

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

Answer 28

* ***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%)

Question 29

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

Answer 29

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

Question 30

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

Answer 30

* ***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%)

Question 31

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

Answer 31

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

Question 32

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

Answer 32

Phase 'B' Isolation(train related)

Question 33

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

Answer 33

Auxiliary Shutdown Panel to LOCAL(train related)

Question 34

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

Answer 34

Greater than or equal to 60gpm for 30 seconds | ****30 second time delay to prevent isolation on KC pump start/stop****

Question 35

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

Answer 35

Phase 'A' Isolation

Question 36

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

Answer 36

Auxiliary Shutdown Panel to LOCAL

Question 37

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

Answer 37

Phase 'A' Isolation

Question 38

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

Answer 38

Phase 'A' Isolation

Question 39

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

Answer 39

1. Train related pumps start | 2. ND heat exchanger outlet valves open

Question 40

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

Answer 40

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

Question 41

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

Answer 41

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

Question 42

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

Answer 42

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

Question 43

What is the Component Cooling System response to a Blackout?

Answer 43

Train related pumps start

Question 44

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

Answer 44

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 5. 4. 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

Question 45

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

Answer 45

87F