Gland Steam

Question 1

Unit 1 is at 100% power with all systems in a normal lineup.
Gland seal regulating valves GSN-PV-28A and GSN-PV-28B are currently ___(1)___. If instrument air is lost to the valves, they will fail ___(2)___.
A. (1) open; (2) open
B. (1) open; (2) closed
C. (1) closed; (2) open
D. (1) closed; (2) closed

Answer 1

C

Question 2

Unit 2 is at 100% power with all systems in a normal lineup.
While performing a TD for a clearance, instrument air is inadvertently isolated to all valves in the gland sealing system.
What would be the response of the gland seal unloader valve GSN-PCV-27?
A. GSN-PCV-27 would fail open.
B. GSN-PCV-27 would modulate open.
C. GSN-PCV-27 would modulate closed.
D. GSN-PCV-27 would fail closed.

Answer 2

B

GSN-PCV-27 is a self-regulating backpressure control valve.
Since GSN-PV-28A/B will fail open on loss of instrument air, GSN-PCV-27 will have to go open more to pass the additional steam.

Question 3

What is the cooling supply to the gland seal exhaust condenser?
A.  Nuclear Cooling Water (NC)
B.  Turbine Cooling Water (TC)
C.  Plant Cooling Water (PW)
D.  Condensate System (CD)

Answer 3

B

Question 4

Unit 3 is at 100% power with all systems in a normal lineup.
A primary coolant leak causes a reactor trip.
Pressurizer pressure is 1700 psia and slowly lowering.
Containment pressure is 3.5 psig and slowly rising.
With no operator action, how will this affect main condenser vacuum?
A. Vacuum will be lost because main circulating water pumps will trip.
B. Vacuum will be lost because of the loss of gland sealing steam.
C. Vacuum will be maintained. Gland sealing steam is still supplied by main steam.
D. Vacuum will be maintained. Gland sealing steam is still supplied by auxiliary steam.

Answer 4

D