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Exams > 2019 JPM Sim-g — Start and Load an EDG During Loss of All Off-Site Power

2019 JPM Sim-g — Start and Load an EDG During Loss of All Off-Site Power

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JPM Sim-g — Start and Load an EDG During Loss of All Off-Site Power Simulator | RO/SRO | 064 A4.06 (3.9/3.9)
Location: Simulator
Time-Critical: No
Alternate Path: No
Estimated Time: 8 minutes

Initial Conditions:
- Unit 2 experienced a Reactor Trip following a total loss of off-site power.
- The crew is implementing 2-EOP-LOPA-1 with all actions completed through Step 12.
- The following is a status of AC Power:
  - 2A EDG tripped shortly after the reactor was tripped and is being investigated by Maintenance.
  - 2B EDG was secured (stopped) by the crew due to the bus being locked out on Bus Differential.
  - 2C EDG was C/T for scheduled maintenance prior to this event.

Initiating Cue:
- You are the Plant Operator.
- WCC Supervisor reports that 2C EDG has been restored from maintenance and tags are fully released.
- The CRS directs you to start and load 2C EDG starting at Step 13 of EOP-LOPA-1.
- Your evaluator will respond to all other alarms not related to your task.
Task Standard:
1. Starts 2C EDG and one SW pump for that bus, and closes 23SW20 valve.
2. Starts all directed C bus loads IAW Table C of EOP-LOPA-1.
▶ Show Critical Steps & Key Actions
Step Critical Element Standard
13 CAUTION — 4KV VITAL BUS LOADING SHOULD NOT EXCEED POWER SUPPLY CAPACITY: DG 2000-HR LIMIT 2750 KW, DG 2-HR LIMIT 2860 KW, DG HALF-HR LIMIT 3100 KW Operator reviews CAUTION and continues on.
14 * Start 2C EDG by depressing DIESEL GEN START PB Operator starts 2C EDG and verifies FREQUENCY is >= 60 Hz and VOLTS is >= 4.15 KV.
14 * (contd) Close 2C EDG output breaker — depress MIMIC PB for 2C DG 4KV BKR 2CDD, verify MIMIC PB illuminates Yellow and BUS INTLK CLOSE SELECTION bezel illuminates Yellow, then depress 2C BREAKER CLOSE PB Operator must select the 2C DG output breaker via the MIMIC PB first, verify both the MIMIC PB and BUS INTLK CLOSE SELECTION bezel illuminate yellow, then close the breaker. 2C TROUBLE console alarm will be illuminated due to loss of bus voltage.
14 * (contd) Start one SW pump on 2CC1 (25 or 26 SW pump) Operator depresses START PB for either 25 or 26 SW pump and verifies associated amps are increasing.
14 * (contd) Check loading on 2C EDG and close 23SW20 Operator checks loading on 2C EDG by observing KW meter, then depresses CLOSED PB for 23SW20 on 2CC1 and verifies PB illuminates.
15 SEND OPERATORS TO START NON OPERATING DGs AND TO MONITOR OPERATING DGs CRS will dispatch operator to monitor 2C DG, CRS directs you to continue on with the procedure.
16 IS ANY 4 KV VITAL BUS ENERGIZED YES: Operator determines that 2C 4KV Vital bus is energized.
17 IS SI ACTUATED / IS SI REQUIRED NO to both: Operator determines SI has not actuated and SI is not required.
17 * (contd) Start all directed C bus loads IAW Table C: 22 Charging Pump, 23 CCW Pump, #2 ECAC Operator starts the required loads by depressing the START PBs and verifying PB illuminates followed by amps increasing. Operator monitors EDG loading during starting loads.
Key Decision Point:
The discriminating step is closing the 2C EDG output breaker — the operator must first depress the MIMIC PB for 2C DG 4KV BKR 2CDD, verify both the MIMIC PB illuminates Yellow AND the BUS INTLK CLOSE SELECTION bezel illuminates Yellow, then depress 2C BREAKER CLOSE PB. The 2C TROUBLE console alarm will be illuminated (from loss of bus voltage prior to energizing), and the operator must not be distracted by it. After energizing the bus, starting a SW pump is critical for EDG cooling — the EDG has no cooling water without a SW pump running on its bus.
Ref: 2-EOP-LOPA-1 (R31) | Task: N0640010101 | K/A: 064 A4.06 — Ability to manually operate and/or monitor in the control room: Emergency generator breakers | Source: New | View JPM PDF

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