Waste Gas (WDS)

Question 1

What is the Waste Gas Design?

Answer 1

Adequate processing of waste gases from both plants assuming continuous operation with 1% fuel defect

Question 2

What does the WGC inlet isolation valve do?

Answer 2

Prevents short-circuiting gas thru the standby WGC

Question 3

What does the WGC Moisture Sep Unloader valve do?

Answer 3

Prevents compressor from starting under load

Question 4

What does the WGC Moisture Sep Gas Recycle Valve do?

Answer 4

Controls vent header pressure by opening to recycle waste gas from moisture separator back to vent header

Question 5

What is the interlock associated with the GDT Inlets?

Answer 5

Only 1 can be open at a time

“Break before make”

Question 6

When will the I/S GDT swap to the Standby GDT?

Answer 6

• Hi-Hi oxygen (from AOM)
• In Service GDT gets to 100#

only swaps if a standby tank is selected

Question 7

At what constant pressure does RRV-305 (Waste Gas Release pressure Ctrl Valve) maintain the inlet pressure to RRV-306?

Answer 7

5 psig

Question 8

What does RRV-306 (Waste Gas Release Flow Ctrl valve) do?

Answer 8

Manually positioned to control release FLOW rate

Question 9

What will trip RRV-306 (Waste Gas Release Flow Ctrl valve) closed?

Answer 9

• Loss of both U1 AX Fans
• High Rad on U1 or U2 Vent Stack Rad Monitors (VRS-1500/2500)

Question 10

What does the AGA do?

Answer 10

Monitors GDTs for flammable mix of hydrogen and oxygen

Question 11

What does the AOM do?

Answer 11

• Monitors oxygen at discharge of compressors (moisture separator)
• Isolates the inservice GDT on a High - High Oxygen alarm

Question 12

Per TRO 8.7.13, Gas Storage Tanks, why do we restrict that gas storage radioactivity?

Answer 12

Ensures that during an uncontrolled release of the tanks’ contents, with the resulting total body exposure to an individual at the nearest site boundary will not exceed 0.5 rem

Question 13

What interlock does RRV-306 have to open?

Answer 13

• At least 1 AX must be running**

Question 14

Where does the AOM sample the waste gas header

Answer 14

Discharge of the moisture separator on the WGC

Question 15

If VRS-2500 loses power, what happens if you are doing a gas release?

Answer 15

RRV-306 will close; AX fan will still be running

Question 16

What are the alarms for the AGA?

Answer 16

High O2 – 2.5% O2
High H2 – 4.0% H2

Question 17

What are the alarms for the AOM?

Answer 17

• High O2 – 2.5% O2
• Hi-Hi O2 – 2.7% O2 (Closes GDT inlet on I/S GDT)

Question 18

What is the normal waste gas vent header pressure?

Answer 18

Between 1.3 - 2.0 psig

Question 19

What is the maximum limit of radioactivity in the gas storage tanks per TRO 8.7.13 (Gas Storage Radioactivity)?

Answer 19

43,800 Ci noble gas