Q1 — RCP Starting Requirements
003 RCPS-K6.14 (2.6)
Given:
- Unit 2 is in MODE 5
- ALL RCPs are stopped
- The crew is preparing to start 23 RCP in accordance with S2.OP-SO.RC-0001 (REACTOR COOLANT PUMP OPERATION)
Considering ONLY the following plant conditions below:
1. Pressurizer level is less than 92%
2. ALL Steam Generator secondary side temperatures are less than 50°F above any RCS Cold Leg temperature
Which ONE of the following completes the statement below?
With one or more RCS Cold Leg temperatures less than or equal to 312°F, _(1)_ conditions shall be met before starting 23 RCP.
Starting 23 RCP when the start criteria are NOT met will result in _(2)_.
- Unit 2 is in MODE 5
- ALL RCPs are stopped
- The crew is preparing to start 23 RCP in accordance with S2.OP-SO.RC-0001 (REACTOR COOLANT PUMP OPERATION)
Considering ONLY the following plant conditions below:
1. Pressurizer level is less than 92%
2. ALL Steam Generator secondary side temperatures are less than 50°F above any RCS Cold Leg temperature
Which ONE of the following completes the statement below?
With one or more RCS Cold Leg temperatures less than or equal to 312°F, _(1)_ conditions shall be met before starting 23 RCP.
Starting 23 RCP when the start criteria are NOT met will result in _(2)_.
A. (1) BOTH (2) degradation of the RCP motor due to a larger motor starting current
B. (1) BOTH (2) an RCS pressure transient caused by energy addition from the secondary system
C. (1) at least one of the (2) degradation of the RCP motor due to a larger motor starting current
D. (1) at least one of the (2) an RCS pressure transient caused by energy addition from the secondary system
▶ Show Answer & Explanation
✓ D. Correct. IAW S2.OP-SO.RC-0001 (REACTOR COOLANT PUMP OPERATION) Limitations, with one or more RCS Cold Leg temperatures less than or equal to 312°F, at least one of conditions shall be met before starting 23 RCP. Starting 23 RCP when the start criteria are NOT met will result in an RCS pressure transient caused by energy addition from the secondary system.
✗ A. Incorrect but plausible. For Part 1, the candidate could incorrectly conclude that both conditions must be met to start the 23 RCP. For Part 2, protecting the RCP motor is a valid concern and there are design features of the RCPs and starting duty requirements which protect the RCP motor. Consequently, the candidate could incorrectly conclude that starting 23 RCP when the start criteria are NOT met will result in degradation of the RCP motor due to a larger motor starting current.
✗ B. Incorrect but plausible. For Part 1, the candidate could incorrectly conclude that both conditions must be met to start the 23 RCP. Part 2 is correct.
✗ C. Incorrect but plausible. Part 1 is correct. For Part 2, protecting the RCP motor is a valid concern and there are design features of the RCPs and starting duty requirements which protect the RCP motor. Consequently, the candidate could incorrectly conclude that starting 23 RCP when the start criteria are NOT met will result in degradation of the RCP motor due to a larger motor starting current.
Ref: S2.OP-SO.RC-0001 | LO: NOS05RCPUMP-13 | Source: New | Cognitive: Lower
Connections
- Related systems: RCPs, RCS
- Related procedures: S2.OP-SO.RC-0001 — Reactor Coolant Pump Operation
- Related tech specs: TS 3/4.4 — Reactor Coolant System
- Related exam: 2019 NRC Written Exam