Q85 — High Containment Radiation / FRCE-3 Yellow Path
W/E16 High Containment Radiation-G2.4.1 (4.7)
Given:
• A LOCA is in progress at Unit 2
At time 14:00
• 2R44A and 2R44B (High Range Containment Accident Monitors) are reading 2 R/HR
At time 15:00
• 2R44A and 2R44B (High Range Containment Accident Monitors) are reading 100 R/HR
Which ONE of the following completes the statements below?
In accordance with 2-EOP-CFST-1 (Critical Safety Function Status Trees), _(1)_ is the EARLIEST time that 2-EOP-FRCE-3 (Response To High Containment Radiation) entry conditions are met.
In accordance with OP-AA-101-111-1003 (Use Of Procedures), the crew _(2)_ REQUIRED to perform 2-EOP-FRCE-3 (when entry conditions are met).
• A LOCA is in progress at Unit 2
At time 14:00
• 2R44A and 2R44B (High Range Containment Accident Monitors) are reading 2 R/HR
At time 15:00
• 2R44A and 2R44B (High Range Containment Accident Monitors) are reading 100 R/HR
Which ONE of the following completes the statements below?
In accordance with 2-EOP-CFST-1 (Critical Safety Function Status Trees), _(1)_ is the EARLIEST time that 2-EOP-FRCE-3 (Response To High Containment Radiation) entry conditions are met.
In accordance with OP-AA-101-111-1003 (Use Of Procedures), the crew _(2)_ REQUIRED to perform 2-EOP-FRCE-3 (when entry conditions are met).
A. _(1)_ 15:00 _(2)_ IS
B. _(1)_ 15:00 _(2)_ is NOT
C. _(1)_ 14:00 _(2)_ IS
D. _(1)_ 14:00 _(2)_ is NOT
▶ Show Answer & Explanation
✓ D. Correct. For Part 1 and in accordance with 2-EOP-CFST-1 (Critical Safety Function Status Trees), 2-EOP-FRCE-3 entry conditions are met when R44 radiation is ≥ 2 R/HR. The earliest time that this occurs is at 14:00. For Part 2, FRCE-3 is a yellow path procedure. In accordance with OP-AA-101-111-1003 (Use Of Procedures), yellow path function restoration procedures are not required to be performed.
✗ A. For Part 1, 100 R/HR is the warning setpoint for R44A/B. The candidate could incorrectly conclude FRCE-3 entry conditions are first met when R44A/B go into warning. For Part 2, since most procedures are required to be performed when entry conditions are met, the candidate could incorrectly conclude that FRCE-3 is required to be performed when the entry conditions are met.
✗ B. For Part 1, 100 R/HR is the warning setpoint for R44A/B. The candidate could incorrectly conclude FRCE-3 entry conditions are first met when R44A/B go into warning. Part 2 is correct.
✗ C. Part 1 is correct. For Part 2, since most procedures are required to be performed when entry conditions are met, the candidate could incorrectly conclude that FRCE-3 is required to be performed when the entry conditions are met.
Ref: 2-EOP-CFST-1, OP-AA-101-111-1003 | LO: NOS05PROCED-08 (USE AND CONTROL OF PROCEDURES) — 5. Implement Rules Of Usage For Emergency Operating Procedures; NOS05FRCE00-06 (EOP-FRCE-1, 2 AND 3 CONTAINMENT ENVIRONMENT FUNCTIONAL RESTORATION) — 1. Describe the EOP mitigation strategy | Source: New | Cognitive: Higher
Connections
- Related systems: Radiation Monitoring, Containment
- Related EOPs: EOP-CFST-1 — Critical Safety Function Status Trees, EOP-FRCE-3 — Response to High Containment Radiation Levels
- Related procedures: OP-AA-101-111-1003 — Use of Procedures
- Related exam: 2018 NRC Written Exam