Liquid Rad Waste (WDS)

Question 1

What will auto close the Unit Release Valve (RRV-286/287)?

Answer 1

• NO CW Pumps running in associated unit

- Both Fail Closed

Question 2

When would RRV-285, liquid release valve, trip closed?

Answer 2

• RRS-1001 Hi Rad
• RRS-1000 Failure
• High; Low Rad Monitor Sample Flow
  (RFS-1010, RFS-1011)
• Fails Closed **

Question 3

When would the monitor tank pump trip when the selector switch is in release?

Answer 3

• RRS-1001 Hi Rad
• RRS-1000 Failure
• High; Low Rad Monitor Sample Flow
  (RFS-1010, RFS-1011)
• Low MT Lvl

Question 4

When do the aux building floor drains drain to?

Answer 4

• 609’ and above drains go to DWHUT.
• 587’ drains go to DST.
• 573’ drains go to Aux Sump.

Question 5

Which ONE of the following lists the two conditions that will independently cause automatic closure of Liquid Waste Disposal Effluent Discharge Header Shutoff Valve, 12-RRV-285?

A. Low circulating water flow High radiation sensed in the release header

B. Low circulating water flow High radiation sensed in the circulating water flow

C. Low release header radiation monitor sample flow High radiation sensed in the release header

D. High release header radiation monitor sample flow High radiation sensed in the circulating water flow

Answer 5

• C. Low release header radiation monitor sample flow High radiation sensed in the release header

Question 6

What is the purpose of the Time Delay Chamber in the Liquid Release flowpath?

Answer 6

• Time Delay Chamber gives sufficient delay time in the release flowpath- allows RRV-285 to close in time to prevent the release of bad water.

Question 7

What is the Interlock for CWHUT and DWHUT inlet valves? (RRV-255/256)

Answer 7

• Interlocked so that both cannot be closed at the same time (prevents backing up of drains)
• RRV-255/256 Fail open

Question 8

Which ONE of the following describes three sources of liquid waste to the Reactor Coolant Drain Tank?

A. Excess Letdown Heat Exchanger , Lower Containment Sump, Charging Line Suction Relief

B. RCS Loop Drains, Reactor Vessel Flange Leak Off, SI Accumulator Tank Drains

C. RCS Loop Drains, Pressurizer Relief Tank, Reactor Cavity Sump

D. RCP Thermal Barrier Relief, Excess Letdown/Seal Return Relief, Reactor Vessel Flange Leak Off

Answer 8

• B. RCS Loop Drains, Reactor Vessel Flange Leak Off, SI Accumulator Tank Drains

Question 9

What Drain sources tap into RCDT Outlet piping?

Answer 9

• RCP #3 Seal

- PRT

Question 10

What drains into the CWHUT and Clean Sump Tank?

Answer 10

• Hard Piped equipment drains from the 609’ and above go to CWHUT
• Hard Piped drains on the 587’ drain to Clean Sump Tank

Question 11

Where does the Hot Chem Lab drain to?

Answer 11

• CDT

Question 12

What 3 sumps are pumped out of containment?

Answer 12

• Lower Ctmnt Sump
• Reactor Cavity Sump
• Pipe Tunnel Sump
• All pump to DWHUT/CWHUT

Question 13

Clean/Dirty Sump tank overflow to?

Answer 13

• Aux Sump