CCS(1) - Component Cooling Water

Simplified Diagram

CCS-V200,207,208 Auto Actions

DO NOT Close on “T”

Auto-Close on “S” or RCP High Bearing Temp 185°F

CCS CIV Power Supplies
V200
V207
V208

V200: IDSD-DK
V207: IDSA-DK
V208: IDSD-DK

“Valve numbers in order spell DAD”

CCS Surge Tank

Makeup provided by DWS V130 AOV (Driven from LT130 ONLY)

Normal Level Control Band: 45-55%

Low-3 at 5%: 2/2 LTs will send override-stop to both pumps

Designed to accommodate a 50gpm leak for 30 minutes

LCV 130 will Fail CLOSED Would rather manually makeup to tank every shift before we flood the turbine building

*Need BOTH LTs (130/131) to prevent cavitating the pumps, but only need 130 to properly control level

CCS Pumps Basics

Power Supplies: ES-1(2)

Auto-Starts
Low flow of 5,000gpm in discharge header
SBDG sequencer at 200sec

High Low Discharge Pressure Alarms: 165/125psig

CVS Letdown Hx Cooling FCV
CCS-V221
Basics

Driven by CVS-TE002 (Downstream CVS water after LD Hx)
135.5°F on CVS Opens to cool CVS
600gpm CCS flow Closes to limit flow (Close has priority over Open) Flow limit is in case of Hx Fouling CVS to CCS leak, so preventing that leak from spreading is more important than protecting resin
*Special: It’s an AOV that Fails AS-IS

RCPs Supply/Return Alarms

High: 750gpm

Low: 550gpm

Flow Deviation:
Both met simultaneously:
INLET Flow drops by 20gpm per 30sec average
OUTLET Flow rises by 20gpm per 30sec average

CCS-V256’s
RCP x Return AOVs
Basics

Power Supplies

A&C: EDS-3
B&D: EDS-4

*Just like CCS-V221 these are special AOVs that fail AS IS

CCS-V500
RCP VFD Inlet AOV

Auto Opens on VFD “Ready to Run” signal

Normally closed at power, but fails OPEN

Interlock to ensure full flow restored when VFD operation needed, prevents closing V500 unless all 4 VFD Breakers are OPEN

CCS-V405A/B
VWS Chiller A/B Outlet AOVs

Auto-Open on associated Chiller start sequence

Auto-Close on Chilled Water Pump stop

*Again CCS AOVs are special, these are fail AS IS AOVs

System requires BOTH pumps running to allow both Chiller cooling outlets to be open at the same time

CCS Nominal Temperatures and Flowrates

Random P&Ls

FPS can be connected to CCS to provide cooling to the RNS HXs and RNS Pumps

Minimum flow to the RNS Hx to remove decay heat within 72hrs has been determined to be 1,100gpm

CVS Makeup Pump Miniflow Hx

When: (Local to miniflow Hxs)
CSC Temperature >130°F
OR
CCS Flow <50gpm AND CVS Makeup Pump Discharge Flow <45gpm (90 if both pumps running)

EQUALS

The affected CVS Makeup Pump will trip

CCS

Overall Power Supplies

CCS

Nominal Values

T 3.7.3 CCS - RCS Open

LCO

TRS Flow rate requirements

TWO trains shall be Functional and ONE pump in operation to support RNS

Required flowrate through RNS Heat Exchanger:

One Pump: >2,685gpm

Two Pumps: >2,685gpm PER RNS Hx

T 3.7.3 CCS - RCS Open

Bases

BOTH pumps non-functional: Do NOT open RCS

Perform maintenance MODES 1, 2, and 3