• Steam condensation during operations
• deaeration of condensate
• sufficient subcooling of condensate to prvent cavitation of RFP
• A means of make up water addition to the condensate system from the CST

• Tube fouling
• reducing the number of operating CW pumps
• increased air in-leakage
• higher circ water temperature
• increased reactor power

9 stage

vertically mounted

centrifugal

5400 Gpm

A-Bus 1

B- Bus 2

C- Bus 2

What provides cooling to the condensate pump motors?

How long could they operate on a loss of cooling?

TBCCW provides cooling

Cond pumps can operate for 10 min on loss of cooling

supplies cond to the LP turbine exhaust hood to cool the hood during low power operations (12-15%)

condensate water sprays in-between the exhaust hood and an internal shroud

Steam packing exhauster

Condensate pumps minimum flow

provides mechanical filtration and ionic exchange to:

• Minimizes impurities
• Minimizes corrosion products available for activation, thus minimizing radiation levels

Hold pump starts at 800 GPM

and shuts off at 1200 GPM

• @ 55PSID flow balance overide is actuated; All E valves full open
• @ 60psid bypass vlv (CD-8) 100% open signal
• @70 Psid bypass vlv (CD-8) trips open (trip must be manually reset)

Protect pump from damage on a low flow conidtion (490,000 ldm/hr)

Discharges to the main condenser

Pumps A & B powered from Bus #1

Pump C powered from Bus #2

One condensate pump running

suction valve open

suction pressure >98Psig

Take the switch to start position

One condensate pump running

suction valve open

suction pressure >98 psig

no high level trips present

running pump tripped with switch in normal after start

standby pump switch in normal after stop

• Loss of all condensate pumps
• electrical fault
• low suction pressure (90 Psig suction for 1 second)
• Low oil pressure (<5psig for 1 sec)
• Low suction flow (<300,000 lbm/hr for 13sec)
• High reactor vessel water level (177``)
• B feed pump loss of 4KV bus 2 and A feed pump running
• Load shed on a failure of fast transfer

Suction pressure 90 psig suction for 1 second

A RFP suction <98 psig for 30 sec

B RFP suction <98 psig for 45 sec

C RFP suction <98 psig for 40 sec

What Feed water line does RWCU tie into?

what other systems discharge back to RWCU?

RWCU ties into B FW line

RCIC and CRD tie into RWCU

To minimize the dose contribution from Co-60 by injecting depleted zinc oxide into the RCS via feedwater.

Zinc ions reduce the corrosion of stainless steel surfaces in the primary systems, lowering the radiation levels due to Co-60 deposition

¨zinc preferentially plates out on the piping & metal surfaces rather than the Co-60, forcing the Co-60 to remain in solution, to be removed by the Reactor Water Clean Up System

To change the reactor water enviorment to 

—  Minimize Intergranular Stress Corrosion Cracking (IGSCC)

—  Minimize Irradiation Assisted Stress Corrosion Cracking (IASCC)

n  Increases overall plant thermal efficiency by using steam drains from the crossover lines and the low pressure turbines to preheat the feedwater going to the reactor…

Steam from the 6th stage of the HP turbine

AKA cross over A/C piping

A heaters- Hotwell A

B heaters- Hotwell B

High pressure= 1A,2A,1B,2B

Low pressure= 5A,4A,3A,5B,4B,3B

TRU 1-4 - Feed pump room

TRU 5- Condensate pump room

TRU 6&7- Turbine building deck

Supplies control room and cable vault

Cooled by SCH-1

Supplies admin building except control room and cable vault

Cooled by SCH 2

What provides cooling to SCH 2?

A & C - Bus 4

B & D - Bus 3

• If A&C (B&D) pumps are running- A(B) Breaker will trip

C(D) Breaker will remain closed

• A(C) in Auto/ C(A) running- A(C) pump low pressure auto start blocked

C(A) Breaker remains closed

• Both off- A Breaker closes

- C remains open however (if A BKR fails to close, C Bkr will close when DG-A BKR closes)

90 psig starts pump in auto

86 psig low pressure alarm on 9-6

85 psig starts electric fire pump

75 psig starts diesel fire pump

SW-19 A & SW-19B or SW-20 closed isolates SW non essential loads

To prevent one SW pump trying to cool all loads, whichge  would cause pump damage due to run out. This ensures essential loads recieve adequate cooling (particularly the running EDG)

A & C- Bus 4

B & D - Bus 3

Open cycle

Hybrid Cycle

Closed cycle

Pump A- Bus 1

Pumps B & C - Bus 2

Veritcally mounted

120,000 Gpm each,

Motor cooling and gland seal supplied from SW

overcurrent

lo-lo level (207` @ intake)

discharge valve <20 % open)

undervoltage

Vertically mounted,

Centrifugal,

122,000 GPM

oil cooler and pump seals supplied by pump discharge

powere from bus 5B

overcurrent

low discharge structure level @ A 223`, B 223.5`, C 224`

No cooling tower riser valve full open

It is an older design that is seismically rated. Used in conjuctiong with cell 2-1 and the deep basin to provide alternate cooling. 

Normal power supply is 5B2A

Discharge valve starts to open.

@ 20% open pump starts

if pump is not started by 25% the valve will stop at 25%

if pump starts and then trips the discharge valve will go shut.

1. CWBPs have been pumping water to a tower for >24hrs following a long term shutdown or
2. <=7 days have elapsed since 4 (or more) continuous hours of CWBP operation.