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Exams > 2018 Q69 — High RCS Activity Charging Pump Transfer and Letdown Maximization

2018 Q69 — High RCS Activity Charging Pump Transfer and Letdown Maximization

⚠️ DRAFT
Q69 — High RCS Activity Charging Pump Transfer and Letdown Maximization APE: 076 High Reactor Coolant Activity-AA2.02 (2.8)
Given:
• Unit 1 is at 100% Reactor Power and stable
• The crew is performing S1.OP-AB.RC-0002 (High Activity In Reactor Coolant System)
• 13 Charging Pump is in service
• 1CV4 (75 GPM ORIFICE) is in service
• Chemistry has just reported that the confirmatory sample has confirmed increasing activity in the RCS but below LCO 3.4.9 (Specific Activity) limits

In accordance with S1.OP-AB.RC-0002, which ONE of the following completes the statements below?

The crew _(1)_ required to place either 11 Charging Pump or 12 Charging Pump in service and secure the 13 Charging Pump.
In addition to 1CV4, the crew _(2)_ required to also place 1CV3 (45 GPM ORIFICE) in service.

(1)(2)
A. is / is
B. is / is NOT
C. is NOT / is
D. is NOT / is NOT
▶ Show Answer & Explanation
✓ A. Correct. For Part 1, IAW S1.OP-AB.RC-0002 Step 3.15, the crew is required to transfer to a Centrifugal Charging Pump (CCP). Consequently, the crew is required to secure the 13 Charging Pump (PDP) and place either 11 Charging Pump or 12 Charging Pump (CCPs) in service. For Part 2, IAW S1.OP-AB.RC-0002 Step 3.16, the crew is required to maximize letdown flow. Consequently, in addition to 1CV4, the crew is required to also place 1CV3 (45 GPM ORIFICE) in service.
✗ B. Incorrect but plausible. Part 1 is correct. For Part 2, the candidate could know that letdown should be maximized. However, the candidate could misinterpret this requirement to be having only the highest rated orifice (75 GPM) in service.
✗ C. Incorrect but plausible. For Part 1, the candidate could incorrectly conclude that either the 13 Charging Pump is a CCP or that the PDP Charging pump may remain in service when performing S1.OP-AB.RC-0002. Part 2 is correct.
✗ D. Incorrect but plausible. For Part 1, the candidate could incorrectly conclude that either the 13 Charging Pump is a CCP or that the PDP Charging pump may remain in service when performing S1.OP-AB.RC-0002. For Part 2, the candidate could know that letdown should be maximized. However, the candidate could misinterpret this requirement to be having only the highest rated orifice (75 GPM) in service.
Ref: S1.OP-AB.RC-0002 (High Activity In Reactor Coolant System) | LO: NOS05ABRC02-05 — Describe, in general terms, the actions taken in S2.OP-AB.RC-0002 and the bases for the actions in accordance with the Technical Bases Document | Source: Modified Bank | Cognitive: Lower

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