LOT 202.02 Main Steam

Question 1

• LOT 202.02 Main Steam*
• • *

Which steam lines go to which steam chest?

Answer 1

“A” / “D” connect to West steam chest

“B” / “C” connect to East steam chest

Connect to equalizing header before going to main turbine.

Question 2

• LOT 202.02 Main Steam*
• • *

Where does AFW #14 tap off the Main Steam system?

Answer 2

SG “D” PORV line

Question 3

• LOT 202.02 Main Steam*
• • *

What are the design operating parameters of the Main steam system?

Answer 3

• Pressure:*
• *1285 psig**
• 1185 psig - 1050 psig (0% - 100%)*
• Temperature:*
• *600 ˚F**
• Saturated System (Dependent on pressure)*
• Flow:*
• *17,431,819 ^lbm/_hr**

Question 4

• LOT 202.02 Main Steam*
• • *

What is steam line equalizing pressure (PT-557) used for?

Answer 4

SGFPT control

• *Steam Dumps**
• When in pressure control mode*

Located on CP007

Question 5

• LOT 202.02 Main Steam*
• • *

What loads are supplied from the MS header?

Answer 5

MSRs (2)

Steam Dumps (12)

SGFPTs (3)

Gland Seal

Aux Steam

Question 6

• LOT 202.02 Main Steam*
• • *

A loss of power to what components will cause the SG PORVs to close?

Answer 6

Hydraulic Pump:
ESF MCCs
Train A: SG “A” and SG “D” / Train B: SG “B” / Train C: SG “C”
Can be bypassed using station blackout switches
Once bypassed, can operate PORVs with accumulator pressure (1.5 strokes)

• Servo Motors:*
• *PORV “A”: DP1201**

PORV “B”: DP1203

PORV “C”: DP1204

PORV “D”: DP1202

Question 7

• LOT 202.02 Main Steam*
• • *

How is the MSIVs operated?

Answer 7

Air Open / Spring Close

• Closes in ≤ 5 sec upon receipt of close signal
• Both MSIVs and MSIBs fail closed on loss of air
• MSIVs stay open on loss of power

• Note:*
• Physically located on IVC 58’
• Controlled from CP006