Q3 — Phase A Safeguards Indication
EPE09 EA1.08 (4.0)
Given:
• Unit 2 reactor tripped and Safety Injection actuated due to a small break LOCA.
• The crew has entered 2-EOP-TRIP-1, Reactor Trip or Safety Injection.
• The crew is performing step 12, Safeguard Valve Alignment.
• The RO notices on 2CC1 SAFEGUARDS ACTUATION Bezels that the "ØA ISOLATION OPERATE" Red light is lit for one train and is out for the other train.
Which ONE of the following completes both statements?
1. The train of Phase A (ØA) with the Red light __(1)__ failed to actuate.
2. In accordance with 2-EOP-TRIP-1, control room operators will attempt to reposition the components associated with the lights on 2RP4 that are __(2)__ on the train that failed to actuate.
• Unit 2 reactor tripped and Safety Injection actuated due to a small break LOCA.
• The crew has entered 2-EOP-TRIP-1, Reactor Trip or Safety Injection.
• The crew is performing step 12, Safeguard Valve Alignment.
• The RO notices on 2CC1 SAFEGUARDS ACTUATION Bezels that the "ØA ISOLATION OPERATE" Red light is lit for one train and is out for the other train.
Which ONE of the following completes both statements?
1. The train of Phase A (ØA) with the Red light __(1)__ failed to actuate.
2. In accordance with 2-EOP-TRIP-1, control room operators will attempt to reposition the components associated with the lights on 2RP4 that are __(2)__ on the train that failed to actuate.
A. 1) lit
2) lit
2) lit
B. 1) lit
2) out
2) out
C. 1) out
2) lit
2) lit
D. 1) out
2) out
2) out
▶ Show Answer & Explanation
✓ D. Correct. Red light not lit indicates that the train failed to actuate. The Phase A lights (Green) on 2RP4 not lit indicates that the component failed to reposition. IAW EOP-TRIP-1 step 12, if any safeguards valve is not in the required position, then place the valves in the safeguards position.
✗ A. Incorrect. Red light lit indicates the train actuated. Status lights on 2RP4 lit indicates that the component reposition to its safeguard position. Plausible because the operator may incorrectly determine how the status lights should indicate for a Phase A actuation and RP4 status panel.
✗ B. Incorrect. Red light lit indicates the train actuated. Second part is correct. Plausible because the operator may incorrectly determine how the status lights should indicate for a Phase A actuation and RP4 status panel.
✗ C. Incorrect. The first part is correct. Status lights on 2RP4 lit indicates that the component reposition to its safeguard position. Plausible because the operator may incorrectly determine how the status lights should indicate for a Phase A actuation and RP4 status panel.
Ref: 2-EOP-TRIP-1 (R40) | LO: NOS05TRP001-08, Obj 21 — Determine the indications that are monitored to ensure proper system/component operation for each step in 2-EOP-TRIP-1 | Source: Bank — Diablo Canyon 2019 NRC RO28 | Cognitive: Comprehension/Analysis
Connections
- Related systems: RPS/SSPS
- Related EOPs: EOP-TRIP-1 — Reactor Trip or Safety Injection
- Related exam: 2022 NRC Written Exam