JPM RO-A1.b — Determine Time to Makeup to Unit 2 RWST
Admin | RO/SRO | G2.1.23 (4.3/4.4)
Location: Classroom (Administrative)
Time-Critical: No
Alternate Path: No
Estimated Time: 15 minutes
Initial Conditions:
- Salem Unit 2 is at 100% power
- You are the RO on-shift
- Make-up to the RWST is required to restore level to the Tech Spec minimum
- Current RWST level is 40.0 feet
- Current RWST boron concentration is 2360 ppm
- Current BAST boron concentration is 6900 ppm
- Section 5.8.3 of S2.OP-SO.CVC-0006, Boron Concentration Control, will be used to make-up to the RWST
Initiating Cue:
The CRS directs you to perform the following:
1. DETERMINE the boric acid flowrate to make-up to the RWST
2. DETERMINE the time to raise the RWST to the Tech Spec minimum level
Time-Critical: No
Alternate Path: No
Estimated Time: 15 minutes
Initial Conditions:
- Salem Unit 2 is at 100% power
- You are the RO on-shift
- Make-up to the RWST is required to restore level to the Tech Spec minimum
- Current RWST level is 40.0 feet
- Current RWST boron concentration is 2360 ppm
- Current BAST boron concentration is 6900 ppm
- Section 5.8.3 of S2.OP-SO.CVC-0006, Boron Concentration Control, will be used to make-up to the RWST
Initiating Cue:
The CRS directs you to perform the following:
1. DETERMINE the boric acid flowrate to make-up to the RWST
2. DETERMINE the time to raise the RWST to the Tech Spec minimum level
Task Standard:
The task is satisfactorily met when the applicant has determined a boric acid flowrate of 26 gpm and will take 59.2 minutes to raise the RWST level to the Tech Spec minimum level.
The task is satisfactorily met when the applicant has determined a boric acid flowrate of 26 gpm and will take 59.2 minutes to raise the RWST level to the Tech Spec minimum level.
▶ Show Critical Steps & Key Actions
| Step | Critical Element | Standard |
|---|---|---|
| 1.0 * | Determine boric acid flowrate | Per step 5.8.3.A, obtain boric flow setpoint from S2.RE-RA.ZZ-0012, Figures 100B or 100D. Determines a boric acid flowrate of 26 gpm. |
| 2.0 * | Determine RWST Tech Spec minimum level | Per TS 3.5.4, determines the RWST minimum level is 40.5 feet (363280 gallons). |
| 3.0 * | Determines the amount of make-up (in gallons) required to raise RWST level from 40.0 feet to Tech Spec minimum level (40.5 feet) | Using Tank Curves for Unit 2 RWST: 40.0 feet = 360000 gallons, 40.5 feet = 364500 gallons. 364500 - 360000 = 4500 gallons. |
| 4.0 * | Determine the amount of time to raise RWST level to the Tech Spec minimum level | Determines it will take 59.2 minutes: (4500 gallons / 76 gpm = 59.2 minutes). 76 gpm = 26 gpm boric acid + 50 gpm primary water. |
Key Decision Point:
The calculation chain: (1) look up boric acid flow from REM figures based on RWST and BAST boron concentrations → 26 gpm, (2) find TS minimum RWST level → 40.5 feet, (3) convert feet to gallons using tank curves → 4500 gallons needed, (4) total makeup flow = boric acid + primary water (26 + 50 = 76 gpm), (5) time = 4500/76 = 59.2 minutes.
The calculation chain: (1) look up boric acid flow from REM figures based on RWST and BAST boron concentrations → 26 gpm, (2) find TS minimum RWST level → 40.5 feet, (3) convert feet to gallons using tank curves → 4500 gallons needed, (4) total makeup flow = boric acid + primary water (26 + 50 = 76 gpm), (5) time = 4500/76 = 59.2 minutes.
Ref: S2.OP-SO.CVC-0006, S2.RE-RA.ZZ-0012, S2.OP-TM.ZZ-0002 | Task: N0040170101 | K/A: G2.1.23 — Ability to perform general and/or normal operating procedures during any plant condition | Source: New | View JPM PDF
Connections
- Related systems: ECCS, CVCS
- Related tech specs: TS 3/4.5 — ECCS
- Related procedures: S2.OP-SO.CVC-0006 — Boron Concentration Control
- Related exam: 2023 NRC Operating Exam