2019 Q90 — DC Battery Cell Voltage LCO 3.8.2.3

✓ C. Correct. Based on the question stem, at 1200 the 2A 125 VDC battery does not meet the Category B and C limits for 3 connected cells. This puts the Unit in LCO 3.8.2.3 REQUIRED ACTIONS C, D and F. Condition D and F are the most limiting and the crew has 2 hours to restore the battery to OPERABLE status or be within HOT STANDBY within the next 6 hours. Consequently, if ALL 3 connected battery cells continue to have a Float Voltage of 0 Volts, then 2000 (2 + 6 = 8 hours maximum) on January 7th is the LATEST Date/Time that Unit 2 is required to be in HOT STANDBY.

✗ A. Incorrect but plausible. 2000 on January 8th is the time/date if the candidate incorrectly applies the 24 hours to restore the battery to OPERABLE status IAW LCO 3.8.2.3 REQUIRED ACTION C then applies the 8 hours to place the Unit in HOT SHUTDOWN per LCO 3.8.2.3 REQUIRED ACTION F (if ALL 3 connected battery cells continue to have a Float Voltage of 0 Volts).

✗ B. Incorrect but plausible. 1800 on January 8th is the time/date if the candidate incorrectly applies the 24 hours to restore the battery to OPERABLE status IAW LCO 3.8.2.3 REQUIRED ACTION C then incorrectly applies 6 hours to place the Unit in HOT SHUTDOWN per LCO 3.8.2.3 REQUIRED ACTION F (if ALL 3 connected battery cells continue to have a Float Voltage of 0 Volts).

✗ D. Incorrect but plausible. 1800 on January 7th is the time/date if the candidate incorrectly interprets LCO 3.8.2.3 REQUIRED ACTION F to only have 6 hours maximum to place the Unit in HOT STANDBY (if ALL 3 connected battery cells continue to have a Float Voltage of 0 Volts).

Ref: LCO 3.8.2.3 | LO: NOS05TECHSPEC-12 — Describe the general component and parameter categories addressed by TS Sections 3/4.1 through 3/4.12 | Source: New | Cognitive: Higher