CCW

Question 1

LCO 3.7.7 “CCW System” requirements

Answer 1

2 CCW trains shall be operable

Question 2

CCW safety related loads

Answer 2

SDC HX

ESS seal cooling

Question 3

CCW non-safety related loads

Answer 3

PCP leak off and oil coolers
Letdown HX
SFP HX
Evaps
Waste gas compressors
CRDM seals
Charging pump oil coolers
P-55A fluid drive
Vac degas pumps seal cooling
Shield cooling HX
PCS sample coolers

Question 4

General CCW temp/press ratings

Answer 4

65-140 F

150 psi

Question 5

CCW flow requirements

Answer 5

Normal - 4367 gpm
SDC - 7179 gpm
SIS - 1697 gpm
CHP/RAS - 4573 gpm

Question 6

Normal CCW operation

Answer 6

1 pump running, 2 in standby
2 HX’s in service
Normal TCV’s throttle service water flow to control CCW temp 72-88 F

Question 7

SDC CCW operation

Answer 7

2 pumps running, 1 in standby
2 HX’s in service
Placed in service when PCS <265 psi and 300 F

Question 8

CCW pump power supplies

Answer 8

P-52A/C - C bus

P-52B - D bus

Question 9

CCW pump flow capacity

Answer 9

6000 gpm

Question 10

CCW pump auto starts

Answer 10

Low header pressure - 80 psi with pump in standby
SIS
NSD sequencer
DBA sequencer

Question 11

CCW pump auto stops

Answer 11

Load shed

Overcurrent

Question 12

CCW pump CR controls

Answer 12

Close - starts pump, takes it out of standby

Trip - stops pump, takes it out of standby

Question 13

CCW pump standby feature

Answer 13

Push button

Allows auto start at 80 psi header pressure

Question 14

How can CCW pump standby be disabled

Answer 14

Take pump hand switch to trip
Pump start
Undervoltage on pump’s respective bus

Question 15

CCW HX max flow

Answer 15

4700 gpm corresponds to DP of:
E-54A - 24.1 psid
E-54B - 22.0 psid

Question 16

CCW HX preferred DP

Answer 16

1 pump - 6-8 psid

2 pumps - 12-16 psid

Question 17

RIA-0915 CCW rad monitor function

Answer 17

Monitors CCW pump discharge

Swaps CCW surge tank vent from atmosphere to VGCH when high rad is detected

Question 18

Where can CCW HX inlet CV-0945/0946 be operated from and how do they fail

Answer 18

Fail open

Operated from CR or C-33

Question 19

CCW HX TCV CV-0821/0822 function

Answer 19

Control SW flow through CCW HX to control CCW temp

Fail closed

Question 20

CCW HX temp alarm set points

Answer 20

71-89 F

Question 21

Where can SDC HX inlet CV-0937/0938 be operated from and how do they fail

Answer 21

Fail open
Operated from CR or C-33
Open on SIS, and can’t be closed until SIS is reset

Question 22

How does CCW to SFP and Evaps CV-0944A fail and how does it respond on SIS

Answer 22

Fails closed
Closes on SIS
Stays closed until SIS is reset, or handswitch is taken to bypass to allow cooling of SFP

Question 23

CV-0944A control switch positions

Answer 23

Open - opens valve unless SIS is present
Close - closes valve
Bypass - Opens valve if SIS is present, closes valve if SIS isn’t present

Question 24

CCW to Rad Waste Evaporators CV-0944/CV-0977B function

Answer 24

Fails closed
No indication of valve position in CR, only indication is on C-105
Closes on SIS to isolate CCW flow to non-essential loads

Question 25

ESS Pumps CCW Supply/Return CV-0913/CV-0950 function

Answer 25

Fails open Operated from CR or C-33 Normally open, causing locked in alarm in the CR

Question 26

ESS Pumps CCW Supply CV-0949/CV-0948/CV-0947 function

Answer 26

Fails open Operated from CR or C-33 Normally electrically locked open

Question 27

ESS pumps CCW low flow alarm setpoints

Answer 27

WESG - 9-11 gpm EESG - 4-6 gpm Indicates loss of cooling water flow from either CCW or SW depending on which one is aligned. WESG is higher than EESG because there are more pumps in WESG

Question 28

CCW to and from Containment CV-0910/CV-0911/CV-0940 function

Answer 28

``` Fails open to ensure loss of air/power won't isolate CCW to CTMT Closes on CHP Right channel - 0940 Left channel - 0911 Either channel - 0910 ```

Question 29

Differences between CV-0910 CCW to CTMT and CV-0911/0940 CCW from CTMT

Answer 29

CCW to CTMT has a check valve, so no accumulator | CCW from CTMT valves have accumulators good to hold valve closed for 4 hours with a loss of air

Question 30

CCW to/from CTMT control switches

Answer 30

Close - Valve closes as long as no loss of air/power Open - Valve opens regardless of CHP signal Auto - Valve is open until CHP signal present, then valve will close until CHP signal is clear

Question 31

T-3, CCW Surge Tank, normal operating range

Answer 31

47-74% | Tank is big enough so a CCW temp increase from 60 F to 140 F won't cause a high level alarm

Question 32

T-3, CCW Surge Tank, alarm setpoints

Answer 32

35-93%

Question 33

T-3, CCW Surge Tank, sources of inleakage

Answer 33

``` SDC HX SFP HX Letdown HX PCP seals CRD seals ```

Question 34

T-3, CCW Surge Tank, sources of out leakage

Answer 34

``` Evaps Charging pumps lube oil coolers P-55A fluid drive Vac Degas Pumps Shield cooling HX PCP lube oil coolers Waste gas compressors PCS sample cooler ESS pump seals ```

Question 35

CCW surge tank fill CV-0918 function

Answer 35

No Handswitch, only indication Opens at 47% to fill tank from T-81 Closes at 74% Fails closed

Question 36

CCW surge tank vent CV-0915 function

Answer 36

No Handswitch, only indication Fails to VGCH Normally aligned to atmosphere, re-aligns to VGCH on high rad signal

Question 37

CCW response to SIS with offsite power

Answer 37

All 3 pumps start OPEN: • CV-0937/CV-0938, SDC HX Cooling Inlets • CV-0913, ESS Pumps CCW Supply (normally open) • CV-0950, ESS Pumps CCW Return (normally open) Close: • CV-0944A, CCW to SFP & RW Evaporators • CV-0944, CCW to Rad Waste Evaporators • CV-0977B, CCW Return From Rad Waste Evaporators

Question 38

CCW response to SIS with loss of offsite power

Answer 38

P-52A & B start after 23 seconds P-52C starts after 40 seconds if low pressure condition OPEN: • CV-0937/CV-0938, SDC HX Cooling Inlets • CV-0913, ESS Pumps CCW Supply (normally open) • CV-0950, ESS Pumps CCW Return (normally open) Close: • CV-0944A, CCW to SFP & RW Evaporators • CV-0944, CCW to Rad Waste Evaporators • CV-0977B, CCW Return From Rad Waste Evaporators

Question 39

CCW response to a loss of offsite power

Answer 39

P-52A & B start after 23 seconds | P-52C starts after 40 seconds if low pressure condition

Question 40

CCW response to CHP

Answer 40

All 3 pumps start OPEN: • CV-0937/CV-0938, SDC HX Cooling Inlets • CV-0913, ESS Pumps CCW Supply (normally open) • CV-0950, ESS Pumps CCW Return (normally open) Close: • CV-0944A, CCW to SFP & RW Evaporators • CV-0944, CCW to Rad Waste Evaporators • CV-0977B, CCW Return From Rad Waste Evaporators • CV-0910, CCW to CTMT • CV-0911, CCW from CTMT • CV-0940, CCW from CTMT

Question 41

LCO 3.7.7 "CCW System" applicability

Answer 41

Modes 1-4

Question 42

LCO 3.7.7 "CCW System" required actions if less than 100% of the required post accident CCW cooling capability available

Answer 42

Enter LCO 3.0.3 IMMEDIATELY

Question 43

What are the requirements for 100% required CCW post accident cooling with only 1 CCW pump?

Answer 43

1 CCW containment header valve, CV-0910, CV-0911, or CV-0940, operable AND 2 CCW isolation valves for non-safety related loads outside containment, CV-0944A and CV-0944 or (CV-0977B)

Question 44

What are the requirements for 100% required CCW post accident cooling with only 2 CCW pumps?

Answer 44

1 CCW containment header valve, CV-0910, CV-0911, or CV-0940, operable OR 2 CCW isolation valves for non-safety related loads outside containment, CV-0944A and CV-0944 or (CV-0977B)

Question 45

What are the consequences of having CCW to/from containment isolation valves (CV-0910, CV-0911, and CV-0940) in open position instead of auto?

Answer 45

Valves will not close on CHP

Question 46

What are the consequences of not having 2 CCW pumps in service when stroking open SDC heat exchanger inlet valves?

Answer 46

Standby CCW pump could start

Question 47

What are the consequences if CCW heat exchanger outlet temperatures get too high?

Answer 47

PCP seal temperatures will elevate