Q84 — Natural Circ Cooldown Rates RVLIS
00WE10EA2.2 (3.9)
Given:
• Unit 2 tripped from 100% Power due to a Loss of Off-Site Power.
• It has been determined that a rapid natural circulation cooldown will be performed.
Complete the following statements concerning the procedural limitation in the natural circulation rapid cooldown rates of the RCS with and without RVLIS being available:
Note: 2-EOP-TRIP-5, Natural Circulation Rapid Cooldown with RVLIS
2-EOP-TRIP-6, Natural Circulation Rapid Cooldown without RVLIS
The cooldown rate of the RCS with RVLIS available will be limited to less than __(1)__, and the cooldown rate of the RCS without RVLIS available will be limited to less than __(2)__.
• Unit 2 tripped from 100% Power due to a Loss of Off-Site Power.
• It has been determined that a rapid natural circulation cooldown will be performed.
Complete the following statements concerning the procedural limitation in the natural circulation rapid cooldown rates of the RCS with and without RVLIS being available:
Note: 2-EOP-TRIP-5, Natural Circulation Rapid Cooldown with RVLIS
2-EOP-TRIP-6, Natural Circulation Rapid Cooldown without RVLIS
The cooldown rate of the RCS with RVLIS available will be limited to less than __(1)__, and the cooldown rate of the RCS without RVLIS available will be limited to less than __(2)__.
A. (1) 50 °F/hr for the initial cooldown to 500 °F, and then less than 100 °F/hr afterwards
(2) 100 °F/hr for the entire cooldown
(2) 100 °F/hr for the entire cooldown
B. (1) 50 °F/hr for the entire cooldown
(2) 100 °F/hr for the entire cooldown
(2) 100 °F/hr for the entire cooldown
C. (1) 100 °F/hr for entire cooldown
(2) 50 °F/hr for the initial cooldown to 500 °F, and then less than 100 °F/hr afterwards
(2) 50 °F/hr for the initial cooldown to 500 °F, and then less than 100 °F/hr afterwards
D. (1) 100 °F/hr for the entire cooldown
(2) 50 °F/hr for the entire cooldown
(2) 50 °F/hr for the entire cooldown
▶ Show Answer & Explanation
✓ C. Correct. EOP-TRIP-6, Rapid Natural Circulation Cooldown without RVLIS restricts the initial cooldown to 500° to a maximum rate of less than 50°F/hr. The subsequent cooldowns in TRIP-5 are at a maximum rate of 100°F/hr. EOP-TRIP-5, Rapid Natural Circulation Cooldown with RVLIS allows a maximum rate of 100°F/hr for the entire cooldown.
✗ A. Incorrect. Plausible because the candidate may confuse the cooldown limit restrictions for with or without RVLIS.
✗ B. Incorrect. Plausible because the candidate may confuse the cooldown limit restrictions for with or without RVLIS.
✗ D. Incorrect. Plausible because the candidate may confuse the cooldown limit restrictions for with or without RVLIS.
Ref: 2-EOP-TRIP-5, Natural Circulation Rapid Cooldown without RVLIS and bases; 2-EOP-TRIP-6, Natural Circulation Rapid Cooldown with RVLIS | LO: N/A | Source: Salem Vision Database | Cognitive: Fundamental
Connections
- Related systems: RVLIS, RCS
- Related EOPs: EOP-TRIP-5 — Natural Circulation Cooldown With RVLIS, EOP-TRIP-6 — Natural Circulation Cooldown Without RVLIS
- Related exam: 2020 NRC Written Exam