Systems Exam 3 - Component Cooling Water

Question 1

CCW Surge Tank Level HI-HI Alarm

Answer 1

Hi-Hi ≥ 88% (75% )

Refer to ABN-502 for leakage into CCW system.

Question 2

CCW Surge Tank Level Lo Alarm

Answer 2

Lo ≤ 65% (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 65-77% (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 ≤ 57% (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

Answer 5

CCW Surge Tank Train A/B Level Lo-Lo Alarm ≤ 63% (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: 9.9 psig (Blocked By AL)

Question 7

What signals isolate CCW Safeguards Loops?

Answer 7

CCW Safeguards Loop Isolations Close on:
→Containment Spray Actuation
→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 throttle for 40% design flow (ABOUT 22% OPEN– blue light on H/S when throttled)
→CCW Isolated to Primary Sample Cooler
→Vent Chillers Isolated

Question 9

CCW Response to Phase A

Answer 9

→CCW to/from Excess Letdown and RCDT HXs isolated
→CNTMT CCW Drain Tank flowpath isolated & pumps stop (because of valve limit switch)

Question 10

CCW Response to CT Spray Actuation

Answer 10

→Train separation valves close
→CS HX CCW out valves (HV-4574 & 4575) fully open then throttle close to achieve 55% design flow,
→RHR HX CCW out valves (HV-4572 & 4573) fully open then throttle close to achieve 40% design flow (if not already in position)

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

Question 11

CCW Response to Phase B

Answer 11

→CNTMT isolation valves for CCW to/from RCPs close
→Non-Safeguards Loop isolation valves close

Question 12

List Non-SFGDs CCW Loads

Answer 12

→Ventilation Chiller Condensers, 2 @ 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
→RHR Heat Exchangers, 2 @ 7600 gpm each (design)
→Containment Spray Heat Exchangers, 2 @ 6080 gpm each (design)
→UPS A/C Unit Condensers, 1 @ 90 gpm per unit (normally in standby)
→Containment Spray Pump Seal Coolers, 4 @ 2 gpm each
→RHR Pump Seal Coolers, 2 @ 5 gpm each
→Post Accident Sampling System (P.A.S.S.) 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.

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.
→the affected RCP Isolation Valve will also close

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

U1 / U2 CCW Surge Tank Level Alarm Setpoints

Answer 19

Note:
→Lo-Lo causes the makeup valves to auto open
→Isolate associated safeguards loop, to protect safeguards equipment, train related; unfortunately this removes flow to non-safeguards equipment unless other train is operating and it does not have a lo-lo level also.

→Hi-Hi: 88% (75%)
→Hi: 77% (65%)
→Lo: 65% (46%)
→Lo-Lo: 63% (39%)
→Empty: 57% (33%)

Bottom of Surge Tank Partition Opening: 58% (37%)

Question 20

When should non-essential flow be isolated and why?

Answer 20

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

Question 21

On a complete loss of CCW flow…

Answer 21

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

Question 22

CCW pump Amber mismatch light comes on when…

Answer 22

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

Question 23

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

Answer 23

→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 24

Tech Spec 3.7.7 CCW Operability

Answer 24

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 25

What is the maximum allowable CCW temperature?

Answer 25

122° F

Question 26

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

Answer 26

>200° F

Question 27

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

Answer 27

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

Question 28

Which CRACs are designated for which unit/train?

Answer 28

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 29

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

Answer 29

→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

Question 30

CCW Pump Recirc Valves FV-4536/4537

Answer 30

→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 31

What are the CCW Pump Start Limitations?

Answer 31

→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 32

What are the CCW Pump Flow Limitations?

Answer 32

→flow rates on CCW system may not exceed 17,500 gpm per pump

Question 33

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

Answer 33

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