Q64 — FRHS-1 Bleed and Feed ECCS Pump Requirements
W/E05 Loss of Secondary Heat Sink-EK2.2 (3.9)
Given:
• The crew is performing the Bleed and Feed Initiation Steps of 1-EOP-FRHS-1 (Response To Loss Of Secondary Heat Sink)
• 11 Charging Pump and 11 SI Pump are the ONLY ECCS pumps running
In accordance with 1-EOP-FRHS-1, which ONE of the following completes the statements below?
The crew _(1)_ proceed in 1-EOP-FRHS-1 and establish the required RCS Bleed Path.
When establishing a Bleed Path, the crew will open _(2)_.
• The crew is performing the Bleed and Feed Initiation Steps of 1-EOP-FRHS-1 (Response To Loss Of Secondary Heat Sink)
• 11 Charging Pump and 11 SI Pump are the ONLY ECCS pumps running
In accordance with 1-EOP-FRHS-1, which ONE of the following completes the statements below?
The crew _(1)_ proceed in 1-EOP-FRHS-1 and establish the required RCS Bleed Path.
When establishing a Bleed Path, the crew will open _(2)_.
| (1) | (2) |
A. can NOT / BOTH PORVs ONLY
B. can NOT / BOTH PORVs and ALL Reactor Head Vents
C. can / BOTH PORVs ONLY
D. can / BOTH PORVs and ALL Reactor Head Vents
▶ Show Answer & Explanation
✓ C. Correct. For Part 1, IAW 1-EOP-FRHS-1 Step 23.2, as long as 1 Charging Pump and 1 SI Pump are running, the crew will continue attempts to start the 12 Charging Pump and 12 SI Pump while establishing an RCS Bleed Path. For Part 2, IAW 1-EOP-FRHS-1 Step 24, the crew will establish an RCS Bleed Path by opening BOTH PORVs.
✗ A. Incorrect but plausible. For Part 1, the desired feed path in 1-EOP-FRHS-1 is to have BOTH SI Pumps and BOTH Charging Pumps feeding the RCS. Consequently, the candidate could incorrectly conclude that an RCS Bleed Path can not be established until BOTH SI Pumps and BOTH Charging Pumps are running. Part 2 is correct.
✗ B. Incorrect but plausible. For Part 1, the desired feed path in 1-EOP-FRHS-1 is to have BOTH SI Pumps and BOTH Charging Pumps feeding the RCS. Consequently, the candidate could incorrectly conclude that an RCS Bleed Path can not be established until BOTH SI Pumps and BOTH Charging Pumps are running. For Part 2, the Reactor Head Vents and the PORVs will both vent the RCS to the PRT. Consequently, the candidate could incorrectly conclude that 1-EOP-FRHS-1 requires ALL Reactor Head Vents and BOTH PORVs to be opened as part of the RCS Bleed Path.
✗ D. Incorrect but plausible. Part 1 is correct. For Part 2, the Reactor Head Vents and the PORVs will both vent the RCS to the PRT. Consequently, the candidate could incorrectly conclude that 1-EOP-FRHS-1 requires ALL Reactor Head Vents and BOTH PORVs to be opened as part of the RCS Bleed Path.
Ref: EOP-FRHS-1 (Response To Loss Of Secondary Heat Sink) | LO: NOS05FRHS00-02 — Describe the EOP mitigation strategy for Response to Loss of Secondary Heat Sink | Source: New | Cognitive: Higher
Connections
- Related systems: ECCS, Pressurizer & PRT
- Related EOPs: EOP-FRHS-1 — Response to Loss of Secondary Heat Sink
- Related exam: 2018 NRC Written Exam