Q2 — High RCS Activity CVCS Response
004 CVCS-A2.09 (3.0)
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)
- 11 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 the 13 Charging Pump in service and then secure the 11 Charging Pump.
In addition to 1CV4, the crew will also place _(2)_ in service.
- Unit 1 is at 100% Reactor Power and stable
- The crew is performing S1.OP-AB.RC-0002 (High Activity In Reactor Coolant System)
- 11 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 the 13 Charging Pump in service and then secure the 11 Charging Pump.
In addition to 1CV4, the crew will also place _(2)_ in service.
A. (1) is (2) 1CV3 (45 GPM ORIFICE)
B. (1) is (2) 1CV5 (75 GPM ORIFICE)
C. (1) is NOT (2) 1CV3 (45 GPM ORIFICE)
D. (1) is NOT (2) 1CV5 (75 GPM ORIFICE)
▶ Show Answer & Explanation
✓ C. Correct. For Part 1 and IAW S1.OP-AB.RC-0002 Step 3.14, the crew is required to have a Centrifugal Charging Pump (CCP) in service. Consequently, the crew is NOT required to place the 13 Charging Pump (PDP) in service then secure the 11 Charging Pump. For Part 2 and 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.
✗ A. Incorrect but plausible. For Part 1, the candidate could incorrectly conclude that the 13 Charging pump must be placed in service when performing S1.OP-AB.RC-0002. Part 2 is correct.
✗ B. Incorrect but plausible. For Part 1, the candidate could incorrectly conclude that the 13 Charging pump must be placed in service when performing S1.OP-AB.RC-0002. For Part 2, the candidate could know that letdown will be maximized in S1.OP-AB.RC-0002 Step 3.16 but incorrectly conclude that BOTH 75 gpm orifices will be placed in service.
✗ D. Incorrect but plausible. For Part 2, the candidate could know that letdown will be maximized in S1.OP-AB.RC-0002 Step 3.16 but incorrectly conclude that BOTH 75 gpm orifices will be placed in service.
Ref: S1.OP-AB.RC-0002 (High Activity In Reactor Coolant System) | LO: NOS05ABRC02-05 | Source: Modified Bank (ILOT 1601 NRC RO Q69) | Cognitive: Lower
Connections
- Related systems: CVCS
- Related procedures: AB.RC-0002 — High Activity in the RCS
- Related tech specs: TS 3/4.4 — Reactor Coolant System
- Related exam: 2019 NRC Written Exam