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Exams > 2019 Q64 — FRHS-1 Bleed and Feed ECCS Pump Requirement

2019 Q64 — FRHS-1 Bleed and Feed ECCS Pump Requirement

⚠️ DRAFT
Q64 — FRHS-1 Bleed and Feed ECCS Pump Requirement WE05 Loss of Secondary Heat Sink-EK1.3 (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 12 Charging Pump are the ONLY ECCS pumps running

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.

If the crew can proceed in 1-EOP-FRHS-1 to establish an RCS Bleed path, then the crew will open _(2)_.
A. (1) can    (2) BOTH PORVs ONLY
B. (1) can    (2) BOTH PORVs AND all Reactor Head Vents simultaneously
C. (1) can NOT    (2) BOTH PORVs ONLY
D. (1) can NOT    (2) BOTH PORVs AND all Reactor Head Vents simultaneously
▶ Show Answer & Explanation
✓ C. Correct. For Part 1 and IAW 1-EOP-FRHS-1 Step 23, as long as 1 Charging Pump and 1 SI Pump are running, the crew will continue attempts to start the other Charging Pump and the SI Pump while establishing an RCS Bleed Path. Given the current plant conditions (only charging pumps running, no SI pump), the crew can NOT proceed in 1-EOP-FRHS-1 and establish the required RCS Bleed Path. For Part 2 and IAW 1-EOP-FRHS-1 Step 24, opening BOTH PORVs ONLY is an allowable Bleed Path in accordance with 1-EOP-FRHS-1.
✗ A. Incorrect but plausible. For Part 1, the candidate could misinterpret plant conditions and incorrectly determine that with the given conditions, FRHS-1 allows the crew to proceed and establish the required RCS Bleed Path. Part 2 is correct.
✗ B. Incorrect but plausible. For Part 1, the candidate could misinterpret plant conditions and incorrectly determine that with the given conditions, FRHS-1 allows the crew to proceed and establish the required RCS Bleed Path. 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 | Source: Modified Bank - ILOT 1601 NRC RO 64 | Cognitive: Higher

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