Q81 — EOP-LOCA-5 RWST Makeup and SG Level
W/E11 Loss of Emergency Coolant Recirculation-G2.1.9 (4.5)
Given:
• The crew is performing 2-EOP-LOCA-5 (Loss Of Emergency Recirculation)
• Containment Pressure is 12.0 psig and slowly rising
In accordance with 2-EOP-LOCA-5, which ONE of the following completes the statements below?
The crew will add makeup to the RWST per _(1)_.
After the crew has initiated an RWST makeup, the crew will maintain TOTAL feed flow greater than 22E04 LB/HR until at least one SG NR Level is greater than _(2)_ %.
NOTE:
• S2.OP-SO.CVC-0006 (Boron Concentration Control) Section 5.8, "Makeup to RWST Using CVCS Makeup System"
• S2.OP-SO.SF-0001 (Fill And Transfer Of Spent Fuel Pool) Section 5.6, "Transferring Spent Fuel Pool Water to RWST"
• The crew is performing 2-EOP-LOCA-5 (Loss Of Emergency Recirculation)
• Containment Pressure is 12.0 psig and slowly rising
In accordance with 2-EOP-LOCA-5, which ONE of the following completes the statements below?
The crew will add makeup to the RWST per _(1)_.
After the crew has initiated an RWST makeup, the crew will maintain TOTAL feed flow greater than 22E04 LB/HR until at least one SG NR Level is greater than _(2)_ %.
NOTE:
• S2.OP-SO.CVC-0006 (Boron Concentration Control) Section 5.8, "Makeup to RWST Using CVCS Makeup System"
• S2.OP-SO.SF-0001 (Fill And Transfer Of Spent Fuel Pool) Section 5.6, "Transferring Spent Fuel Pool Water to RWST"
A. _(1)_ S2.OP-SO.CVC-0006 Section 5.8 _(2)_ 15%
B. _(1)_ S2.OP-SO.CVC-0006 Section 5.8 _(2)_ 9%
C. _(1)_ S2.OP-SO.SF-0001 Section 5.6 _(2)_ 15%
D. _(1)_ S2.OP-SO.SF-0001 Section 5.6 _(2)_ 9%
▶ Show Answer & Explanation
✓ A. Correct. For Part 1 and IAW 2-EOP-LOCA-5, the crew will add makeup to the RWST per S2.OP-SO.CVC-0006 Section 5.8. For Part 2, Since Containment Pressure is 12 psig, containment is ADVERSE. Therefore IAW 2-EOP-LOCA-5, after the crew has initiated an RWST makeup, the crew will maintain TOTAL feed flow greater than 22E04 LB/HR until at least one SG NR Level is greater than 15 %.
✗ B. Part 1 is correct. For Part 2, if containment was normal, IAW 2-EOP-LOCA-5, after the crew has initiated an RWST makeup, then the crew will maintain TOTAL feed flow greater than 22E04 LB/HR until at least one SG NR Level is greater than 9 %. Consequently, given the plant conditions, the candidate could incorrectly conclude that the crew will maintain TOTAL feed flow greater than 22E04 LB/HR until at least one SG NR Level is greater than 9 %.
✗ C. For Part 1, S2.OP-SO.SF-0001 Section 5.6 is an approved operations procedure to provide makeup to the RWST. Consequently, the candidate could incorrectly conclude that 2-EOP-LOCA-5 directs the crew to initiate an RWST makeup per S2.OP-SO.SF-0001 Section 5.6. Part 2 is correct.
✗ D. For Part 1, S2.OP-SO.SF-0001 Section 5.6 is an approved operations procedure to provide makeup to the RWST. Consequently, the candidate could incorrectly conclude that 2-EOP-LOCA-5 directs the crew to initiate an RWST makeup per S2.OP-SO.SF-0001 Section 5.6. For Part 2, if containment was normal, the crew will maintain TOTAL feed flow greater than 22E04 LB/HR until at least one SG NR Level is greater than 9 %.
Ref: 2-EOP-LOCA-5 | LO: NOS05LOCA05-04 (EOP-LOCA-05, LOSS OF EMERGENCY RECIRCULATION) — 1. Describe the EOP mitigation strategy during LOSS OF EMERGENCY RECIRCULATION | Source: New | Cognitive: Lower
Connections
- Related systems: ECCS, CVCS
- Related procedures: S2.OP-SO.CVC-0006 — Boron Concentration Control, S1.OP-SO.SF-0001 — Fill and Transfer of Spent Fuel Pool
- Related EOPs: EOP-LOCA-5 — Loss of Emergency Coolant Recirculation
- Related exam: 2018 NRC Written Exam