Well and Demin

Question 1

What are the Three main water storage systems at Dresden?

Answer 1

Well Water, Condensate Transfer, Clean Demin

Question 2

What is the purpose of well water?

Answer 2

Provides water to the domestic water and makeup demin systems

Question 3

What is the purpose of the condensate transfer system?

Answer 3

Provides grade demineralized water, which has been tilized int he Rx/Turbine cycle and is potentially contaminate

Question 4

What is the purpose of Clean Demin System?

Answer 4

Provides Rx grade demin water from MUDS which has never been through Rx/Turbine cycle

Question 5

How many deep well pumps are there?

Answer 5

2 - located north and south of the main parking lot

Question 6

How large is the Well Water Tank?

Answer 6

200,000 gallons

Question 7

What are the high and low level limits of the well water tank and what are the actions at these levels?

Answer 7

Low level (15ft) - well pumps start
High level (28.5ft) - Well pump stop and initiates 2 minute timer to prevent restarting pump

Question 8

What are the power sources for the deepwell pumps?

Answer 8

North - PC-7A; South - PC 4A

Question 9

What is used to transfer water from the well water tanks?

Setpoints?

Answer 9

Domestic water pumps transfer water from the well tanks to the domestic water accumulators.
At 38psig in domestic water accumulator - first pump starts
At 36psig in domestic water accumulator - second pump starts
Pumps stop at level of 31” and air blank makes up pressure to 48psig

Question 10

Where is level of the well water tank indicated?

Answer 10

2/3 MUDS CR and MCR

Question 11

How many well transfer pumps are there and what do they do?

Answer 11

3 - transfer to MUDS

Question 12

How is level in the domestic water accumulator controlled?

Answer 12

makeup water from well tank.
controlls on Low pressure and HI level
First Pump Starts at 38psig; Second pump starts at 36psig;
Pumps stop at 31”; U1 IA controls air blanket at 48psig to maintain system pressure

Question 13

What is the purpose of the Condensate Transfer System?

Answer 13

To store and pump contaminated demineralized water to the main condenser hotewell and various plat systems as MAKEUP and to supply dedicated amount of water for normal HPCI suction

Question 14

What is the minimum TS level for the CST?

Answer 14

140000 gal

Question 15

How many contaminated Demin Tanks are there?

Answer 15

3 TOTAL
2 - 2/3A and 2/3 B
1 - U1 Contaminated DEMIN

Question 16

How do the CST’s ENSURE capacity for HPCI Suction?

Answer 16

Standpipe in 2/3 CSTs are located at 90,000 gallon level.
Everything except HPCI and condensate transfer suction off standpipe to ensure there is a minimum amount dedicated to HPCI.

Question 17

What takes suction off the bottom level of the CST Tanks?

Answer 17

HPCI and Condensate Transfer

Question 18

Where do the CST overflows drain to?

Answer 18

One on each tank - any water from the site glassed overflow lines drain to the U2 Turbine Building EQUIPMENT DRAIN SUMP.

Question 19

Where are the CST Overflow line site glasses located?

Answer 19

Located between floors, south of the stair landing between U2 H2 seal oil unit elevation and the ground floor

Question 20

What powers the Condensate Transfer and Jockey pumps?

Answer 20

2A Cond. Transfer and Jockey Pump - MCC 28-2

2B Cond. Transfer Pp - MCC 29-2

Question 21

How do the CST Immersion Heaters control tank tem?

Answer 21

1A - cycles to maintain above 35F

2/3 - cycle to maintain temp above 42F - NO CONTROL SWITCH

Question 22

How is Hotwell Make-up supplied from the CSTs?

Answer 22

Normally water is VACUUM DRAGGED to condenser through AOV.
Both Pumps auto start if Emergency Makeup AOV goes FULL OPEN
(Open Limit Switch)

Question 23

Where do the Hotwell Make-up Pumps route to/from adn what are their power source?

Answer 23

from CSTs to Hotwell - BOTH POWERED FROM MCC 26-1

Question 24

What are the MAJOR COnd. Transfer Loads?

Answer 24

LPCI/CS Back-up Keep-fill
HPCI Keep Fill (gravity)
RWCU System Demin
IC shell make-up (last Resort)
Fuel Pool system and skimmer surge make-up
SJAE, Gland Seal and Condensate loop seal fill
Cond. Demin, Condensate Transfer water and sonic cleaner
2/3 Radwaste

Question 25

What is the Clean Demin Water System?

Answer 25

Stores clean RX GRADE demin water processed from MUDS

Question 26

Where is Clean Demin Water Stored?

Answer 26

U1B Tank - 200,000gallon tank. - Heater keeps temp above 35F

Question 27

What powers the Clean Demin Pumps?

Answer 27

MCC 25-2 (ONLY ON U2)

Question 28

What is Clean Demin supplied to?

Answer 28

RBCCW and TBCCW head tanks
Main Cond. Vac Pumps
Filter Building
Off-Gas Inst.
Recomb Rooms
SWC
CREVS
IC NORMAL MAKEUP
SBLC
RW
Service STations