Q7 — PZR Heatup Rate and PRT Pressure
007 PRTS-K5.02 (3.1)
Given:
- Unit 2 Pressurizer is water solid
At time 12:00
- The crew is performing a Pressurizer heatup in accordance with S2.OP-SO.RC-0002 (VACUUM REFILL OF THE RCS) Section 5.4, "Establishing Pressurizer Steam Bubble Without A Vacuum In RCS"
At time 13:00
- The crew has opened 2PR1 (PZR PORV) for Pressurizer degassing in accordance with S2.OP-SO.RC-0002 Section 5.4
Which ONE of the following completes the statements below?
In accordance with LCO 3.4.10.2 (Pressurizer), the MAXIMUM allowable Pressurizer heatup rate is _(1)_ °F per hour.
During the Pressurizer degassing, the crew will open and close 2PR1 to maintain PRT pressure less than a MAXIMUM of _(2)_ psig.
- Unit 2 Pressurizer is water solid
At time 12:00
- The crew is performing a Pressurizer heatup in accordance with S2.OP-SO.RC-0002 (VACUUM REFILL OF THE RCS) Section 5.4, "Establishing Pressurizer Steam Bubble Without A Vacuum In RCS"
At time 13:00
- The crew has opened 2PR1 (PZR PORV) for Pressurizer degassing in accordance with S2.OP-SO.RC-0002 Section 5.4
Which ONE of the following completes the statements below?
In accordance with LCO 3.4.10.2 (Pressurizer), the MAXIMUM allowable Pressurizer heatup rate is _(1)_ °F per hour.
During the Pressurizer degassing, the crew will open and close 2PR1 to maintain PRT pressure less than a MAXIMUM of _(2)_ psig.
A. (1) 100 (2) 10
B. (1) 100 (2) 25
C. (1) 200 (2) 10
D. (1) 200 (2) 25
▶ Show Answer & Explanation
✓ A. Correct. For Part 1 and IAW LCO 3.4.10.2, the MAXIMUM allowable Pressurizer heatup rate is 100°F per hour. For Part 2 and IAW S2.OP-SO.RC-0002 Section 5.4, during the Pressurizer degassing, the crew will open and close 2PR1 to maintain PRT pressure less than a MAXIMUM of 10 psig.
✗ B. Incorrect but plausible. Part 1 is correct. For Part 2, 25 psig is a pressure that is below the PRT rupture disc setpoint of 100 psig and close to the actual limit. Consequently, the candidate could incorrectly conclude that S2.OP-SO.RC-0002 Section 5.4 requires PRT pressure to be maintained less than a maximum of 25 psig.
✗ C. Incorrect but plausible. For Part 1, LCO 3.4.10.2 allows a maximum pressurizer cooldown of 200°F per hour. Consequently, the candidate could incorrectly conclude that LCO 3.4.10.2 allows a maximum pressurizer heatup of 200°F per hour. Part 2 is correct.
✗ D. Incorrect but plausible. For Part 1, LCO 3.4.10.2 allows a maximum pressurizer cooldown of 200°F per hour. Consequently, the candidate could incorrectly conclude that LCO 3.4.10.2 allows a maximum pressurizer heatup of 200°F per hour. For Part 2, 25 psig is a pressure that is below the PRT rupture disc setpoint of 100 psig and close to the actual limit. Consequently, the candidate could incorrectly conclude that S2.OP-SO.RC-0002 Section 5.4 requires PRT pressure to be maintained less than a maximum of 25 psig.
Ref: LCO 3.4.10.2, S2.OP-SO.RC-0002 Section 5.4 | LO: NOS05CVCS00-17 | Source: New | Cognitive: Lower
Connections
- Related systems: Pressurizer & PRT
- Related procedures: S2.OP-SO.RC-0002 — Vacuum Refill of the RCS
- Related tech specs: TS 3/4.4 — Reactor Coolant System
- Related exam: 2019 NRC Written Exam