S/G blowdown

Question 1

Purpose?

Answer 1

• Aid in the protection of the S/Gs from corrosion during normal, ransient and inactive operational periods.
• 3 modes, SGBD/SGWLU/SGDRNDOWN

Question 2

R-19 A/B/C

High alarm does what

Answer 2

• Closes BD isolation valves
• closes BD sample isolation valves
• Closes BD Rate FCV’s
• Will close V1-31 if all 3 R-19’s alarm (does not auto re-open)

Question 3

FCV-4204 A/BC

Blowdown Rate FCV’s

Answer 3

• Control Blowdown rate between 0% and 100% open.

- Kept in manual position

Question 4

SGBD heat Xchangers
Max gpm?
Shell side?
Temps?

Answer 4

• 54gpm max
• CONDENSATE
• SGBD 510 to 146
• Condensate 102 to 131

Question 5

V1-31
Goes where?
Closes on what?

Answer 5

• Goes to Cir Water
• Closes when all R-19s alarm
• Must be manually re-opened

Question 6

SGBD Wet lay up pump trips?

Answer 6

• Flash tank lo-lo level 0%
• Low suction Pressure 1psi
• Auto close on FCV-4204s closure.
• auto close on blowdown isolation valve close while in blowdown mode

Question 7

Orifices’ in lines inside of C.V. do what?

Answer 7

• limit flow in case of downstream break

- are bypassed when plant is shutdown to allow greater flow rates.