Q8 — PZR Saturation and RCP Restart [EDITED]
010 PZR PCS-K5.01 (3.5)
Given:
• The crew is attempting to maintain the PZR water saturated so 13 RCP can be restarted in accordance with 1-EOP-TRIP-6 (Natural Circulation Rapid Cooldown Without RVLIS) Step 1
• PZR Pressure is 2005 psig
• PZR Liquid Temperature is 635 °F
Which ONE of the following completes the statements below?
The PZR is _(1)_.
In accordance with the 1-EOP-TRIP-6, the reason for establishing and maintaining saturation conditions in the PZR is to limit the PZR pressure _(2)_ upon RCP restart.
• The crew is attempting to maintain the PZR water saturated so 13 RCP can be restarted in accordance with 1-EOP-TRIP-6 (Natural Circulation Rapid Cooldown Without RVLIS) Step 1
• PZR Pressure is 2005 psig
• PZR Liquid Temperature is 635 °F
Which ONE of the following completes the statements below?
The PZR is _(1)_.
In accordance with the 1-EOP-TRIP-6, the reason for establishing and maintaining saturation conditions in the PZR is to limit the PZR pressure _(2)_ upon RCP restart.
A. (1) subcooled — (2) rise
B. (1) subcooled — (2) reduction
C. (1) water saturated — (2) rise
D. (1) water saturated — (2) reduction
▶ Show Answer & Explanation
✓ B. Correct. For Part 1, with PZR Pressure at 2005 psig (2020 psia), saturation temperature is 637 °F. Consequently, with PZR liquid temperature at 635 °F, the PZR is NOT water saturated. For Part 2, IAW 1-EOP-TRIP-6, "To limit the pressure decrease upon RCP restart, saturated conditions should first be established in the PZR."
✗ A. Incorrect but plausible. Part 1 is correct. For Part 2, there are concerns for pressure to rise when an RCP is started when the plant is water solid. Consequently, the candidate could incorrectly conclude that the reason for establishing and maintaining saturation conditions in the PZR is to limit the PZR pressure increase upon RCP restart IAW 1-EOP-TRIP-6.
✗ C. Incorrect but plausible. For Part 1, since the steam tables are listed in psia (not psig), the candidate could enter the steam tables at 1990 psia and incorrectly interpolate to determine that the PZR is water saturated. For Part 2, same reasoning as A regarding pressure increase concerns.
✗ D. Incorrect but plausible. For Part 1, since the steam tables are listed in psia (not psig), the candidate could enter the steam tables at 1990 psia and incorrectly interpolate to determine that the PZR is water saturated. Part 2 is correct.
Ref: Steam Tables, 1-EOP-TRIP-6 (Natural Circulation Rapid Cooldown Without RVLIS) | LO: NOS05TRP004-06 — Determine the basis for each step in a Natural Circulation Cooldown | Source: New | Cognitive: Higher
Connections
- Related systems: Pressurizer & PRT, RCPs, Pressurizer Level & Press Control
- Related EOPs: EOP-TRIP-6 — Natural Circulation Cooldown Without RVLIS
- Related exam: 2018 NRC Written Exam