Q11 — RCP Undervoltage Reactor Trip
013 ESFAS-K1.02 (3.2)
Given:
Which ONE of the following completes the statement below concerning RCP Undervoltage Reactor Trip Setpoint and Coincidence?
If the associated Permissive Interlock is satisfied, a Reactor Trip Signal will be generated when 4KV Group Busses H and _(1)_ are less than a maximum of _(2)_ % of normal bus voltage.
Which ONE of the following completes the statement below concerning RCP Undervoltage Reactor Trip Setpoint and Coincidence?
If the associated Permissive Interlock is satisfied, a Reactor Trip Signal will be generated when 4KV Group Busses H and _(1)_ are less than a maximum of _(2)_ % of normal bus voltage.
A. (1) G (2) 70
B. (1) G (2) 90
C. (1) E (2) 70
D. (1) E (2) 90
▶ Show Answer & Explanation
✓ A. Correct. If the associated Permissive Interlock is satisfied, a Reactor Trip Signal will be generated when 4KV Group Busses H and G are less than a maximum of 70% of normal bus voltage.
✗ B. Part 1 is correct. For Part 2, 90% is setpoint for the RCP Low Flow Reactor Trip. Consequently, the candidate could incorrectly conclude that 90% normal bus voltage is the setpoint for the RCP Undervoltage Reactor Trip.
✗ C. The RCP Undervoltage Reactor Trip is based on two selected 4KV Group Busses in an undervoltage condition. The candidate could incorrectly conclude that the 2 selected 4KV Group Busses are H and E. Part 2 is correct.
✗ D. The candidate could incorrectly conclude that the 2 selected 4KV Group Busses are H and E. For Part 2, 90% is setpoint for the RCP Low Flow Reactor Trip. Consequently, the candidate could incorrectly conclude that 90% normal bus voltage is the setpoint for the RCP Undervoltage Reactor Trip.
Ref: NOS05FLUNCY-09 (Licensed Operator Fluency List) | LO: NOS05FLUNCY-09 — State those items in the Licensed Operator Fluency List: Permissives and Control Grade Interlocks, Reactor Trips | Source: Bank | Cognitive: Lower (Memory)
Connections
- Related systems: RPS/SSPS, 4KV
- Related exam: 2018 NRC Written Exam