JPM IP-j — Startup and Parallel a RDMG Set
In-Plant | RO/SRO | 012 A4.07 (3.9/3.9)
Location: In-Plant — 84 ft. Elevation, Unit 1 Switchgear Room
Time-Critical: No
Alternate Path: No
Estimated Time: 15 minutes
Initial Conditions:
- Unit 1 is operating at 75% power.
- 11 Rod Drive MG (RDMG) set tripped 3 days ago.
- Maintenance has completed repairs and is ready to start.
Initiating Cue:
- Start up 11 RDMG set and parallel it to 12 RDMG set IAW S1.OP-SO.RCS-0001, section 5.4.
- Maintenance personnel are standing by to take the required voltage readings.
Time-Critical: No
Alternate Path: No
Estimated Time: 15 minutes
Initial Conditions:
- Unit 1 is operating at 75% power.
- 11 Rod Drive MG (RDMG) set tripped 3 days ago.
- Maintenance has completed repairs and is ready to start.
Initiating Cue:
- Start up 11 RDMG set and parallel it to 12 RDMG set IAW S1.OP-SO.RCS-0001, section 5.4.
- Maintenance personnel are standing by to take the required voltage readings.
Task Standard:
Simulate starting and paralleling 11 RDMG set with 12 RDMG set IAW approved procedures.
Simulate starting and paralleling 11 RDMG set with 12 RDMG set IAW approved procedures.
▶ Show Critical Steps & Key Actions
| Step | Critical Element | Standard |
|---|---|---|
| 5.4.1 | ENSURE A AND B REACTOR TRIP BREAKERS are CLOSED; Running RDMG Set GENERATOR LINE VOLTS is 260V (247V-273V) AND GENERATOR LINE AMPS is ~80 DC AMPS | Locates A AND B REACTOR TRIP BREAKERS and verifies closed. Locates 12 RDMG Set GENERATOR LINE VOLT AND GENERATOR LINE AMPS meters and checks readings. |
| 5.4.2 | ALIGN MG Set Controls for MG Set to be started IAW Attachment 1 | Using Attachment 1, determines 11 MG set controls are aligned: Voltmeter selector switch on A-B, Voltage adjust Vertical, Ammeter selector switch in A, Motor Breaker Control Switch target GREEN / breaker OPEN, Synchronize switch OFF, Generator Breaker Control Switch target GREEN / breaker OPEN. |
| 5.4.3 * | CLOSE MOTOR Breaker AND ALLOW at least 20 seconds for MG Set to reach rated speed | Simulates rotating motor breaker control switch and waits at least 20 seconds before proceeding. |
| 5.4.4 * | PRESS AND HOLD GEN FIELD FLASH pushbutton UNTIL Generator voltage stops rising (GENERATOR LINE VOLTS should indicate ~260V) | Simulates pressing GEN FIELD FLASH pushbutton until Generator voltage stops rising. |
| 5.4.5.A | ADJUST VOLTAGE ADJUST full counterclockwise to LOW (~220V) | Simulates adjusting VOLTAGE ADJUST full counterclockwise to LOW. |
| 5.4.5.B | ADJUST VOLTAGE ADJUST full clockwise to HIGH (~300V) | Simulates adjusting VOLTAGE ADJUST full clockwise to HIGH. |
| 5.4.5.C | ADJUST VOLTAGE ADJUST until GENERATOR LINE VOLTS indicates ~260V | Simulates adjusting VOLTAGE ADJUST counterclockwise until GENERATOR LINE VOLTS indicates ~260V. |
| 5.4.5.D | Direct Maintenance to OBTAIN voltage reading on Running MG Set using DMM at back of installed voltmeter | Directs Maintenance to perform IV and obtain DMM voltage reading on Running MG Set. DMM reads ~130V (approximately half of installed voltmeter). |
| 5.4.5.E | Direct Maintenance to MONITOR voltage reading on In-coming MG Set using DMM at back of installed voltmeter | Directs Maintenance to perform IV and monitor DMM voltage reading on In-coming MG Set. DMM reads ~129V. |
| 5.4.5.F * | ADJUST VOLTAGE ADJUST until DMM voltage is 0-2.5 volts higher than the reading obtained in Step 5.4.5.D (Running MG Set) | Simulates adjusting VOLTAGE ADJUST clockwise to raise voltage until DMM reads 0-2.5V higher than the running set (130V). Incoming MG set voltage must be adjusted ABOVE the running set voltage before paralleling. |
| 5.4.5.G | Direct Maintenance to REMOVE DMM AND CLOSE panel doors | Directs Maintenance to remove DMM and close panel doors. |
| 5.4.6 * | PLACE MG Set SYNCHRONIZE Switch to ON — OBSERVE Generator Breaker automatically closes and load divides equally (~40 DC Amps each) | If necessary, simulates moving the Synchronize Switch from 12 MG set and inserting into 11 MG set, then places in ON. Generator breaker auto-closes and load stabilizes at ~40 amps on each generator. CAUTION: Do NOT manually close generator output breaker — could trip both MG Sets. Auto-closure could take as long as 60 seconds. |
| 5.4.7 | PLACE MG Set SYNCHRONIZE Switch to OFF | Simulates placing 11 MG Set SYNCHRONIZE Switch to OFF. |
Key Decision Point:
Steps 5.4.5.F and 5.4.6 are the discriminating steps — the applicant must adjust the incoming MG set voltage 0-2.5V HIGHER than the running set using DMM readings (CLOCKWISE to raise), then place the SYNCHRONIZE switch to ON to auto-close the generator breaker. The single synchronize handle must be moved from the 12 MG set to the 11 MG set. Manually closing the generator output breaker could trip both MG sets. This is the identical procedure section as the 2023 JPM IP-j (section 4.4 vs section 5.4 — the procedure was revised between exams but the task is the same).
Steps 5.4.5.F and 5.4.6 are the discriminating steps — the applicant must adjust the incoming MG set voltage 0-2.5V HIGHER than the running set using DMM readings (CLOCKWISE to raise), then place the SYNCHRONIZE switch to ON to auto-close the generator breaker. The single synchronize handle must be moved from the 12 MG set to the 11 MG set. Manually closing the generator output breaker could trip both MG sets. This is the identical procedure section as the 2023 JPM IP-j (section 4.4 vs section 5.4 — the procedure was revised between exams but the task is the same).
Ref: S1.OP-SO.RCS-0001 (R32) + OTSC 32A | Task: N0015010104 | K/A: 012 A4.07 — Ability to manually operate and/or monitor in the control room: M/G set breakers | Source: Bank | View JPM PDF
Connections
- Related systems: Control Rod Drive, RPS/SSPS
- Related procedures: S1.OP-SO.RCS-0001 — Rod Control System Operation
- Related exam: 2019 NRC Operating Exam