Systems Exam 3 - Component Cooling Water

Question 1

CCW Surge Tank Level HI-HI Alarm

Answer 1

Hi-Hi Level Alarm
Unit 1: ≥ 88%
Unit 2: ≥ 75%

Refer to ABN-502 for leakage into CCW system.

Question 2

CCW Surge Tank Level Lo Alarm

Answer 2

Level Lo Alarm:
Unit 1: ≤ 65%
Unit 2: ≤ 46%

→CAUTION: IF RMUW is used to makeup to the CCW Surge Tank while a blended flow to the VCT is in progress, THEN an inadvertent boration of the RCS could occur (bigger problem with U1 RMUW Pump than common)
→u-LV-4500 and u-LV-4501 should automatically close on a Surge Tank high level
→u-HS-4500-1, CCW Surge Tank RMUW Supply Valve must be manually closed; there is an alarm on MCB when open

Question 3

CCW Surge Tk Normal Level Band?
Normal Makeup Supply?

Answer 3

Normal Level:
Unit 1: 65-77%
Unit 2: 46-65%

→Alarms to alert operator of level lowering & to initiate makeup
→Normal makeup is RMUW (lower dissolved O2) with Demin water as alternate
→Operator can open an individual compartment makeup valve or both, but must open 4500-1, RMUW MU VLV, to makeup to either compartment.
→Alarm to alert operator that 4500-1 is open

Question 4

CCW Surge Tank Train A/B Empty Alarm

Answer 4

CCW Surge Tank Train A/B Empty:
Unit 1: ≤ 57%
Unit 2: ≤ 33%

AUTOMATIC ACTIONS:
→u-HV-4512, U1 Safeguards Loop Train A CCW Return Valve closes
→u-HV-4514, U1 Safeguards Loop Train A CCW Supply Valve closes
OR
→u-HV-4513, U1 Safeguards Loop Train B CCW Return Valve closes
→u-HV-4515, U1 Safeguards Loop Train B CCW Supply Valve closes

OPERATOR ACTIONS:
→Determine affected surge tank
→If surge tank level is <57% (33%), ensure affected safeguard loop is isolated
→Ensure both CCW pumps are in service

Question 5

CCW Surge Tank Train A/B Level Lo-Lo Alarm
&
Auto-Makeup Starts

Answer 5

CCW Surge Tank Train A/B Level Lo-Lo Alarm
Unit 1: ≤ 63%
Unit 2: ≤ 39%

→u-LV-4500-1, CCW Surge Tank RMUW Supply Valve opens
AND
→u-LV-4500, CCW Surge Tank Makeup Valve 4500 (Trn A) or 4501 (Trn B) opens
→makeup valve 4500 or 4501 will close at ≈77.5%
→u-LV-4500-1 must be manually closed

Refer to ABN-502 for leakage out of CCW system.

NOTE: Due to cut in surge tank partition plate, it will NOT be possible to determine affected CCW surge tank unless level decreases below approximately 60% level.

Question 6

CCW Pump Auto Starts

Answer 6

→SIS
→BOS
→Low Pressure in Opposite Train CCW Supply Header: 64 psig (blocked by AL)
→Auto Start of Associated SSW Pump on Low Pressure in Alternate Train: 10 psig on 10” line (blocked by AL)

Question 7

What signals isolate CCW Safeguards Loops?

Answer 7

CCW Safeguards Loop Isolations Close on:
→Hi-3 Containment Pressure 18.2 psig (2/4)
→Associated Train Surge Tank Empty Alarm (57% U1 & 33% U2)

Question 8

CCW Response to SI

Answer 8

→Pumps Start
→Recirc Valves Close
→RHR HXs CCW Out Valves open fully and then throttle for 40% design flow (ABOUT 22% OPEN– blue light on H/S when throttled)
→Cooler - Primary Sample Cooler CCW isolates
→Vent Chillers Isolate

“Please Remember, Rebellious Cats Vomit”

Question 9

CCW Response to Phase A

Answer 9

→Excess Letdown HX CCW isolated
→RCDT HX CCW isolated
→CNTMT CCW Drain Tank flowpath isolated & pumps stop (because of valve limit switch)

Question 10

CCW Response to Containment Spray Actuation

Answer 10

→Train separation valves close
→CS HX CCW outlet valves (HV-4574 & 4575) fully open then throttle close to achieve 55% design flow,
→RHR HX CCW outlet valves (HV-4572 & 4573) fully open then throttle close to achieve 40% design flow (if not already in position; if valve is already >40% open but not full open, they just throttle back to 40%)

“forty has an R in it, so RHR throttles to 40% flow”

Question 11

CCW Response to Hi-3/Phase B

Answer 11

→energize to actuate signal
→CNTMT isolation valves for CCW to/from RCPs close
→Non-Safeguards Loop isolation valves close
→Safeguards Loops isolate (Hi-3 Signal)
→Containment Spray HX CCW outlet valves open fully and throttle back to 55% flow

Question 12

List Non-SFGDs CCW Loads

Answer 12

→Ventilation Chiller Condensers 1-4 @ 2000 gpm
→Hydrogen Recombiner Heat Exchangers, 1 @ 10 gpm
→Waste Gas Compressor Seal Coolers, 1 @ 50 gpm
→Spent Fuel Pool Heat Exchangers, 1 @ 4000 gpm
→Letdown Heat Exchanger, 1000 gpm @ max temp
→Excess Letdown Heat Exchanger, 260 gpm
→Reactor Coolant Drain Tank Heat Exchanger, 225 gpm
→Seal Water Heat Exchanger, 375 gpm
→Reactor Coolant Pump Packages, 4 @ 535 gpm each
→PD Charging Pump Hydraulic Coupling Oil Cooler and Lube Oil Cooler, 81 gpm
→Process Sample Coolers, 60 gpm
→Instrument Air Packages, unit compressors #1 & #2 @ 43 gpm each (when operating)
→BTRS Letdown Chiller Package Condenser, 1 @ 415 gpm (not used)
→Boron Recycle Evaporator Package, 780 gpm
→Waste Evaporator Package, 780 gpm
→Floor Drain Evaporator Package, 780 gpm

Question 13

List SFGDs CCW Loads

Answer 13

→Safety Chilled Water Chiller Condensers, 2 @ 300 gpm each
→Control Room A/C Unit Condensers, 2 per unit @ 250 gpm each
→UPS A/C Unit Condensers, 1 @ 90 gpm per unit (normally in standby)
→RHR Pump Seal Coolers, 2 @ 5 gpm each
→RHR Heat Exchangers, 2 @ 7600 gpm each (design)
→Containment Spray Pump Seal Coolers, 4 @ 2 gpm each
→Containment Spray Heat Exchangers, 2 @ 6080 gpm each (design)
→Post Accident Sampling System (PASS) Cooler, 7 gpm (Train A Only)

Question 14

What equipment will auto start when a CCW pump is started, if their control switches are in AUTO?

Answer 14

Any start of a CCW pump will automatically start the following equipment, if their control switches are in AUTO:

→Associated CCW pump room fan cooler
→Associated SSW pump
→Associated Safety Chilled Water recirc pump (which will then start associated safety chiller)

Question 15

HV-4696 (RCP Thermal Barrier CCW Return IRC isolation valve) Interlock?

Answer 15

Closes on any RCP Hi Return flow of 64 gpm.

The F in TFT

Question 16

HV-4709 (RCP Thermal Barrier CCW Return ORC Isolation Valve) Interlock?

Answer 16

→closes on any RCP High Return Temp of 182.5° F. (second T in TFT)
→the affected RCP Isolation Valve will also close (first T in TFT)

Question 17

CCW automatically isolates to what loads when they are placed in standby?

Answer 17

CCW flow from any of the following isolates when the chiller is placed in STBY:
→UPS
→CRAC
→Vent Chillers
→Safety Chillers

Question 18

The CCW supply and return isolation valves to vent chillers isolate if…

Answer 18

flow is ≥ 3200 gpm for 30 secs.

Question 19

When should non-essential flow be isolated and why?

Answer 19

EOP-0.0 Attachment 9 directs isolating non-essential loads if flow is >17,500 gpm to prevent runout

Question 20

On a complete loss of CCW flow…

Answer 20

ABN-502 directs a reactor trip followed by a trip of all RCPs

Question 21

CCW pump Amber mismatch light comes on when…

Answer 21

…the pump is taken to start and the pump does not start.

Question 22

What are the CCW unit differences with regard to Instrument Air Compressors?

Answer 22

→Unit 1 IACs have one trim cooler cooled by CCW, and cooling is in series through IAC 1-02 first, followed by 1-01.

→trim cooler → IAC 1-02 → IAC 1-01

→Unit 2 IACs have cooling in parallel with one trim cooler each for IAC 2-01 and 2-02, cooled by CCW

(common IACs X-01 & X-02 cooled by TPCW)

Question 23

Tech Spec 3.7.7 CCW Operability

Answer 23

Both trains of CCW must be operable in Modes 1-4
→one train inoperable: restore within 72 hrs (or RICT)
→can’t restore: mode 3 in 6 hrs, mode 5 in 36 hrs

Note: if any RHR train is made inoperable by CCW inoperability, must enter LCO 3.4.6

Question 24

What is the maximum allowable CCW temperature?

Answer 24

122° F

Question 25

A CCW Pump should be stopped if its bearing temperature is...

Answer 25

>200° F

Question 26

The Containment Spray and RHR HX CCW outlet valve operations are limited to...

Answer 26

...5 times in one minute, per OWI-206 (jog type MOVs)

Question 27

Which CRACs are designated for which unit/train?

Answer 27

Unit 1: →Train A: CRAC X-01 →Train B: CRAC X-03 Unit 2: →Train A: CRAC X-02 →Train B: CRAC X-04

Question 28

How are Vent Chillers X-01 through X-04 supplied by CCW?

Answer 28

→X-01 and X-02 normally supplied by U1 →X-03 and X-04 normally supplied by U2 →If X-01 and X-02 need to be supplied by U2, then all four must be supplied by U2 →If X-03 and X-04 need to be supplied by U1, then all four must be supplied by U1 (avoids cross-tying units when chillers are not in normal alignment)

Question 29

CCW Pump Recirc Valves FV-4536/4537

Answer 29

→fail closed AOVs →open on low flow 8200 gpm, close at 8600 gpm, measured at CCW HX outlet with pump running →fail closed on SI →function restored by resetting SI and resetting valves with reset pushbutton at BOP ARR 1 & 2

Question 30

What are the CCW Pump Start Limitations?

Answer 30

→CCW Pump is allowed 2 starts from ambient →must be a 45 minute standing period between any additional starts →allowed one immediate restart from operating temperature →15 minute running period between any additional restart attempts

Question 31

What are the CCW Pump Flow Limitations?

Answer 31

→flow rates on CCW system may not exceed 17,500 gpm per pump (HX + recirc)

Question 32

When can we open the locked closed RHR HX CCW outlet valves?

Answer 32

Modes 4-6 for additional cooling once RCS <400° F

Question 33

Which parts of the RCPs are cooled by CCW?

Answer 33

→motor air cooler →bearing lube oil reservoir coolers →thermal barrier HX →limits heat from RCS to pump bearing and shaft

Question 34

Common CCW Leak Questions

Answer 34

→CVCS & CCW most common →Rx power up, surge tank level up, leak is in Seal Water HX →Temp on thermal barrier up, RCS leaking through thermal barrier