Q42 — EDG Load Test Values
G2.2.21 (2.9)
Given:
• Corrective Maintenance has just been completed on 2A Emergency Diesel Generator (EDG)
• Operations is preparing to perform a Load Test on 2A EDG as part of the Post-Maintenance Operability Retest
In accordance with S2.OP-ST.DG-0001 (2A Diesel Generator Surveillance Test), which ONE of the following completes the statements below?
To prevent tripping the Diesel Generator Breaker on reverse power, generator load must be IMMEDIATELY raised to greater than a MINIMUM of _(1)_ KW after the breaker is closed.
During the Load Test, the 2A EDG may NOT exceed its _(2)_ KW Continuous Load Rating.
• Corrective Maintenance has just been completed on 2A Emergency Diesel Generator (EDG)
• Operations is preparing to perform a Load Test on 2A EDG as part of the Post-Maintenance Operability Retest
In accordance with S2.OP-ST.DG-0001 (2A Diesel Generator Surveillance Test), which ONE of the following completes the statements below?
To prevent tripping the Diesel Generator Breaker on reverse power, generator load must be IMMEDIATELY raised to greater than a MINIMUM of _(1)_ KW after the breaker is closed.
During the Load Test, the 2A EDG may NOT exceed its _(2)_ KW Continuous Load Rating.
A. _(1)_ 500 / _(2)_ 2600
B. _(1)_ 500 / _(2)_ 2750
C. _(1)_ 200 / _(2)_ 2600
D. _(1)_ 200 / _(2)_ 2750
▶ Show Answer & Explanation
✓ A. Correct. For Part 1 and IAW S2.OP-ST.DG-0001, to prevent tripping the Diesel Generator Breaker on reverse power, generator load must be IMMEDIATELY raised to greater than a minimum of 500 KW after the breaker is closed. For Part 2 and IAW S2.OP-ST.DG-0001, during the Load Test, the 2A EDG may NOT exceed its 2600 KW Continuous Load Rating.
✗ B. Incorrect but plausible. Part 1 is correct. For Part 2, S2.OP-ST.DG-0001 Precautions And Limitations states that the EDG is rated to 2750 KW for 2000 hours (2681 KW Local). Consequently, the candidate could incorrectly conclude that 2750 KW is the Continuous Loading Rating on the EDG.
✗ C. Incorrect but plausible. For Part 1, S2.OP-ST.DG-0001 states that when unloading the EDG, generator load must be maintained at greater than 200 KW until the breaker is opened (to prevent tripping the Diesel Generator Breaker on reverse power). Consequently, the candidate could incorrectly conclude that to prevent tripping the Diesel Generator Breaker on reverse power, generator load must be IMMEDIATELY raised to greater than a minimum of 200 KW after the breaker is closed. Part 2 is correct.
✗ D. Incorrect but plausible. For Part 1, S2.OP-ST.DG-0001 states that when unloading the EDG, generator load must be maintained at greater than 200 KW until the breaker is opened (to prevent tripping the Diesel Generator Breaker on reverse power). Consequently, the candidate could incorrectly conclude that to prevent tripping the Diesel Generator Breaker on reverse power, generator load must be IMMEDIATELY raised to greater than a minimum of 200 KW after the breaker is closed. For Part 2, S2.OP-ST.DG-0001 Precautions And Limitations states that the EDG is rated to 2750 KW for 2000 hours (2681 KW Local). Consequently, the candidate could incorrectly conclude that 2750 KW is the Continuous Loading Rating on the EDG.
Ref: NOS05EDG000-12 (Emergency Diesel Generators) | LO: NOS05EDG000-12 LO 12 | Source: New | Cognitive: Lower
Connections
- Related systems: EDGs
- Related procedures: S2.OP-ST.DG-0001 — Emergency Diesel Generator Surveillance Test
- Related exam: 2018 NRC Written Exam