WG

Question 1

What is the purpose of the Waste Gas System?

Answer 1

-Collects fission gases from contaminated fluids and store these gases until the activity levels have decayed to levels acceptable for release.
-Provides for controlled, monitored release of stored radioactive gas to the environment.
-Provides a reduction in fission gas concentration in NC System which reduces the escape of radioactive gases during maintenance or through leaks.
-Removes air, hydrogen, and fission gases from the NC System and associated components during degas operations

Question 2

Per limits and precautions of OP/0/A/6500/003 A (Gaseous Waste (WG) System (Normal Operations), what pressure is SWGDT A to be maintained at and why?

Answer 2

< 5 psig to receive any relief gases from the Normal WGDT

Question 3

Which WGDT is all releases made from?

Answer 3

WGDT-C

Question 4

Which SWGDT do we get nitrogen from for shutdown?

Answer 4

SWGDT B

Question 5

Where do the relief valves on SWGDT A and SWGDT B relieve to?

Answer 5

Unit 1 vent

Question 6

What EMFs trip 2 will close (1WG-160) Waste Gas Discharge Flow Control Valve?

Answer 6

0EMF 50 (WG discharge monitor)
1EMF-35,36 (Unit Vent monitors)

Question 7

What signals close the VCT Purge Outlet Isolations (1WG-3 or 1WG-14)?

Answer 7

-Trip on low VCT pressure
-Low WG Compressor Suction Header Pressure.
-Both recombiner O2 addition valves A and B have an active “Fast Trip” signal

Question 8

Per SLC 16.11-18 (Explosive Gas Mixture) what is the limit for the concentration of oxygen in the Waste Gas Holdup System if hydrogen concentration is > 4% by volume?

Answer 8

less than or equal to 2% by volume

Question 9

Per SLC 16.11-18 (Explosive Gas Mixture), what is the required action if the concentration of oxygen in the WASTE GAS HOLDUP SYSTEM > 4% by volume and hydrogen concentration > 4% by volume?

Answer 9

-Immediately suspend all additions of waste gases to the system.
AND
-Immediately reduce the concentration of oxygen to < 4% by volume.

Question 10

Per SLC 16.11-19 (Gas Storage Tanks), what is the limit on the quantity of radioactivity contained in each gas storage tank?

Answer 10

less than or equal to 97,000 Curies of noble gases (considered as Xe-133 equivalent)

Question 11

What are the required actions for SLC 16.11-19 (Gas Storage Tanks) what id the required actions if the quantity of radioactive material in tank(s) exceeds the limit?

Answer 11

Immediately suspend all additions of radioactive material to the tank(s).

Question 12

Per 16.11-20 (Gaseous Explosive Gas Monitoring Instrumentation), what are the required explosive gas monitoring instruments and how many channels are required?

Answer 12

Hydrogen Monitors - 1/in-service train per station
Oxygen Monitors - 2/in-service train per station

Question 13

Per 16.11-20 (Gaseous Explosive Gas Monitoring Instrumentation) what is the required action if One required hydrogen monitor channel non-functional?

Answer 13

Immediately Suspend oxygen supply to the recombiner.