Compressed Gas Systems

Question 1

Supplies gas for plant use:
Hydrogen Provides?
Nitrogen Provides?

Answer 1

• Hydrogen provides a cooling medium for the Generator, and cover gas for the VCT
• Nitrogen provides motive force for some gas operated valves, pressurizes SI accumulators, and inert cover gas for some tanks

Question 2

Components to the Hydrogen System?

Answer 2

• High Pressure Hydrogen Cylinders
• Bulk H2 trailer
• PCV-1041 (normal) 120psi
• PCV-1042 (Backup) 90psi
• PCV-118 (25psi)

Question 3

PCV-1041 and PCV-1042

Answer 3

-1041 Maintains 120psi, at 90psi 1042 will open to supply H2 from backup bottles.

Question 4

PCV-118 does?

H2 to VCT

Answer 4

-Supplies H2 to the VCT, reduces the pressure from 120psi to 25psi

Question 5

H2 supply pressure below 75psi causes?

Answer 5

-Alarm on H2 supervisory panel, H2 to generator

Question 6

H2 supply header lo pressure 95psi

Answer 6

-alarms on WDBRP (RTGB gets trouble alarm)

Question 7

Components to the Nitrogen System?

Answer 7

• Liquid Nitrogen Storage Tank
• Heat Exchangers
• Liquid Nitrogen Pump
• High/Low pressure N2 cylinders

Question 8

Heat Exchanges

Answer 8

-Converts N2 liguid to gas using ambient air for heating media. One for High Pressure and one for low pressure.

Question 9

High Pressure Pump

Purpose? power supply? Location?

Answer 9

• Used to raise the low pressure Liquid N2 in the tank, via the heat exchanger convert it to a high pressure gas for the High pressure cylinders.
• Powered from MCC-1
• Starts at 1000psig, stops at 2000psig
• Located at Liquid N2 tank

Question 10

Nitrogen supplies MOF for what vavles?

Answer 10

• steam dumps as primary and backup
• Pressurizer PORVs primary
• S/G PORVs backup