AOP-209 (4) Loss of Turbine Building Closed Cooling Water System

Basic Entry Conditions

Initial TSC Assessment

Intact

Idle TCS Pump

(Step 1)

Only if Surge Tank is >68.5”

*Normal Operation: TCS-V095 Surge Tank Makeup AOV maintains between 72.5”-126”

**There is a Manual Local AOV Bypass to fill the tank (Room 20600)

TCS Pump Assessment

Requirement to start idle TCS pump

Cavitation

What if all efforts to restore TCS Surge Tank are exhausted?
(Step 3)

IF TCS Surge Tank level continues to lower,
Place Plant in MODE 3 using AOP-101 Rapid Power Reduction

Sources of leakage INTO TCS
(Step 4)

SSS Coolers
MFW Pump LO coolers
Generator Stator coolers
EHC coolers
LOS coolers

TCS Discharge Pressure

(Step 5)

CWS Operation

AOP-203

(Step 6)

TCS Heat Exchanger

(Step 7)

Hx Outlets 85°-105°F

TCS Flow

Generator Cooling

If TCS Lost

Pumps secured

Condenser Vacuum

Secondary Sampling

(Steps 15-18)