2018 Q1 — RCP Shaft Shear at 25% Power

✓ C. Correct. For Part 1, when the 13 RCP shaft shears at 17:00:00, the RCS low flow reactor trip setpoint will be met for only 13 Loop. Since the reactor is below P-8 (36% power), the reactor will not trip. For Part 2, PZR spray is produced from the 11 and 13 loop D/Ps (created by the 13 and 11 RCPs). However, 13 RCP actually produces most of the spray flow. Consequently, when 13 RCP trips, full PZR spray flow is not available.

✗ A. Incorrect but plausible. For Part 1, a reactor trip on RCS low flow has different coincidences based on reactor power level. Since the reactor is above P-7 (10% power) and there is a reactor trip based on RCS low flow when the reactor is > P-7, the candidate could incorrectly conclude that at 17:00:30, the reactor is tripped. Part 2 is correct.

✗ B. Incorrect but plausible. For Part 1, same reasoning as A — candidate could incorrectly conclude the reactor is tripped. For Part 2, since many other systems only require 1 pump to provide 100% flow (e.g. CCW, SW, SI, CS, CVCS and RHR), the candidate could incorrectly conclude full PZR spray is available with only one RCP.

✗ D. Incorrect but plausible. Part 1 is correct. For Part 2, since many other systems only require 1 pump to provide 100% flow (e.g. CCW, SW, SI, CS, CVCS and RHR), the candidate could incorrectly conclude full PZR spray is available with only one RCP.

Ref: 2-EOP-FRCE-3 (Licensed Operator Fluency List) | LO: NOS05FLUNCY-09 | Source: New | Cognitive: Higher