JPM Sim-b — Perform Manual Makeup of the VCT
Sim | RO/SRO | 004 A4.04 (3.2/3.6)
Location: Simulator
Time-Critical: No
Alternate Path: No
Estimated Time: 15 minutes
Initial Conditions:
- 100% power, MOL. RCS boron concentration is 900 ppm.
- The crew has entered S2.OP-AB.CVC-0001, Loss of Charging, due to VCT level channel 2LT112 failing high.
Initiating Cue:
- You are the Reactor Operator.
- The CRS has directed you to PERFORM a manual makeup of the VCT to RESTORE VCT level to 53% IAW S2.OP-SO.CVC-0006, Boron Concentration Control, Section 5.2, Manual Makeup Mode.
- All prerequisites are complete with no issues.
- P&Ls have NOT been reviewed.
- Boric Acid Storage Tank boron concentration is 6700 ppm.
Time-Critical: No
Alternate Path: No
Estimated Time: 15 minutes
Initial Conditions:
- 100% power, MOL. RCS boron concentration is 900 ppm.
- The crew has entered S2.OP-AB.CVC-0001, Loss of Charging, due to VCT level channel 2LT112 failing high.
Initiating Cue:
- You are the Reactor Operator.
- The CRS has directed you to PERFORM a manual makeup of the VCT to RESTORE VCT level to 53% IAW S2.OP-SO.CVC-0006, Boron Concentration Control, Section 5.2, Manual Makeup Mode.
- All prerequisites are complete with no issues.
- P&Ls have NOT been reviewed.
- Boric Acid Storage Tank boron concentration is 6700 ppm.
Task Standard:
Initiates manual makeup to VCT and stops the makeup when directed.
Initiates manual makeup to VCT and stops the makeup when directed.
▶ Show Critical Steps & Key Actions
| Step | Critical Element | Standard |
|---|---|---|
| P&Ls | Review Precautions and Limitations 3.1 thru 3.22 | Operator reviews and initials all P&Ls. |
| 5.2.1 | Determine Boric Acid flow setpoint from Figure 100A | Using Figure 100A from S2.RE-RA.ZZ-0012 for 62 gpm Primary Water flow with BAST at 6700 ppm, determines setpoint between 9-11 gpm. If calculated: 9.62 gpm (900 ppm RCS / 6700 ppm BAST). |
| 5.2.3 * | Place Makeup Control in STOP, place 2CV179 and 2CV172 in MANUAL/CLOSE | Presses Makeup Control Mode Select STOP pushbutton and verifies bezel illuminates. Depresses 2CV179 MANUAL PB until bezel illuminates, then CLOSE PB. Note: when selected to MANUAL, 2CV179 will initially go full open — this is expected. Depresses 2CV172 MANUAL PB until bezel illuminates, then CLOSE PB. |
| 5.2.5 | Align blender outlet flowpath (2CV185 or 2CV181) | Selects one flowpath by depressing MANUAL PB then OPEN PB for 2CV185 (preferred — charging pump suction) or 2CV181. |
| 5.2.7 | Start Primary Water pump and Boric Acid pump | Depresses MANUAL PB for selected PW pump, then START PB. Depresses MANUAL PB for selected BAT pump, then FAST START PB. |
| 5.2.8 | Adjust Boric Acid flow on FI110A to value from Step 5.2.1 | Adjusts Boric Acid flow using 2CV172 OPEN/CLOSE PBs to match setpoint (9-11 gpm). |
| 5.2.10 * | Manually ADJUST 2CV179 setpoint to 62 gpm (or as calculated) to maintain required flow | Adjusts Primary Water flow on FI111A to 62 gpm (acceptable range 60-64 gpm) by depressing 2CV179 OPEN PB to raise or CLOSE PB to lower setpoint. |
| 5.2.12 | Secure makeup — close 2CV179, 2CV172, and blender outlet valve | Depresses CLOSE PBs for 2CV179, 2CV172, and whichever of 2CV185 or 2CV181 was opened. Stops Primary Water pump. |
| 5.2.13 * | Place selected Boric Acid pump in SLOW speed and place system to automatic makeup mode | Places selected Boric Acid pump in SLOW speed and verifies. |
Key Decision Point:
The discriminating element is the boric acid flow setpoint determination (Step 5.2.1). The applicant must use the correct figure (Figure 100A for 62 gpm PW flow at normal BAST concentration) — NOT Figure 100C (wrong boron concentration of 9000 ppm) or Figure 105 (temperature correction, N/A at 100% power). Additionally, the applicant must recognize that 2CV179 will initially go full open when placed in MANUAL and must then close it before proceeding.
The discriminating element is the boric acid flow setpoint determination (Step 5.2.1). The applicant must use the correct figure (Figure 100A for 62 gpm PW flow at normal BAST concentration) — NOT Figure 100C (wrong boron concentration of 9000 ppm) or Figure 105 (temperature correction, N/A at 100% power). Additionally, the applicant must recognize that 2CV179 will initially go full open when placed in MANUAL and must then close it before proceeding.
Ref: S2.OP-SO.CVC-0006 (Rev 25) | Task: 0040130101 | K/A: 004 A4.04 — Ability to manually operate and/or monitor in the control room: CVCS (3.2/3.6) | Source: Bank | View JPM PDF
Connections
- Related systems: CVCS
- Related procedures: S2.OP-SO.CVC-0006 — Boron Concentration Control, AB.CVC-0001 — Loss of Charging
- Related exam: 2018 NRC Operating Exam