2018 Q37 — Condensate LP Heater Bypass / CN22 Valves

✓ D. Correct. For Part 1, with 21CN22 and 23CN22 closed, 2CN45 will modulate open to maintain <65 psid across 21 and 22 LP Heaters. With 2CN45 modulated, Feedwater temperature will lower. With SG Steam flow constant, Reactor power will rise. For Part 2, the CN22s only have indications in the Control Room (no controls). Consequently, the crew can not open 21CN22 and 23CN22 from the Control Room.

✗ A. For Part 1, the candidate could fail to recognize that with the given condensate transient, Feedwater temperature will lower, causing reactor power to rise. For Part 2, other CN valves associated with Feedwater heaters can be operated in the Control Room (e.g. 2CN45 and 2CN47). The candidate could incorrectly conclude that 21CN22 and 23CN22 can also be opened from the control room.

✗ B. For Part 1, the candidate could fail to recognize that Feedwater temperature will lower. Part 2 is correct.

✗ C. Part 1 is correct. For Part 2, other CN valves can be operated in the Control Room. The candidate could incorrectly conclude that 21CN22 and 23CN22 can also be opened from the control room.

Ref: NOS05CN&FDW-15 (Condensate and Feedwater System) | LO: NOS05CN&FDW-15 Obj 7 — Identify and describe local controls, indications, and alarms | Source: New | Cognitive: Higher