2020 Q30 — CVCS CV71 Post-SI

✓ D. Correct. CV-68 & 69, Charging Header Isolation Valves go closed on an SI signal and are in series with the CV-71 flow path, therefore no change to charging pump discharge pressure or flow occur.

✗ A. Plausible because during normal power alignment, throttling the CV-71 will result in a rise in charging discharge pressure and total charging flow will remain constant. Flow will increase to the RCP seals, while charging flow to the regenerative heat exchanger will lower. Incorrect because CV-68 & 69, Charging Header Isolation Valves go closed on an SI signal and are in series with the CV-71 flow path. The second part is correct, total charging flow will remain constant.

✗ B. Plausible because during normal power alignment, throttling the CV-71 will result in a rise in charging discharge pressure. Additionally the candidate may confuse total charging flow with charging flow to the regenerative heat exchanger which will lower. Incorrect because CV-68 & 69, Charging Header Isolation Valves go closed on an SI signal and are in series with the CV-71 flow path.

✗ C. The first part is correct, charging discharge pressure will remain constant as the CV-68 & 69, Charging Header Isolation Valves go closed on an SI signal and are in series with the CV-71 flow path. The second part is plausible because during a normal power alignment, closing down on the CV-71 would increase seal injection flow.

Ref: NOS05CVCS00-17 lesson plan | LO: NOS05CVCS00-17, ELO 4.a | Source: Bank — Salem Vision Database | Cognitive: Comprehension