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Exams > 2023 JPM RO-A2 — Perform Seven Day AFD Surveillance

2023 JPM RO-A2 — Perform Seven Day AFD Surveillance

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JPM RO-A2 — Perform Seven Day AFD Surveillance Admin | RO/SRO | G2.2.12 (3.7/4.1)
Location: Classroom (Administrative)
Time-Critical: No
Alternate Path: No
Estimated Time: 10 minutes

Initial Conditions:
- At Time 0830 today, Salem Unit 2 is at 73% power to comply with TS LCO 3.1.3.1 Action c.2 due to a single control rod being declared INOPERABLE

Initiating Cue:
- You are the RO on-shift
- The CRS directs you to perform the Seven Day AFD surveillance test per Section 4.1 of S2.OP-ST.NIS-0001, Power Distribution — Axial Flux Difference
- Current AFD Channel Console Readings are:
  Channel I: -9.5
  Channel II: -10.1
  Channel III: -10.6
  Channel IV: -10.2
- All prerequisites are completed
Task Standard:
The task is satisfactorily met when the applicant has determined that the Seven Day AFD Surveillance is UNSAT because AFD Channel 3 reading is outside the AFD Lower Limit.
▶ Show Critical Steps & Key Actions
Step Critical Element Standard
1 * RECORD AFD Target from REM Data Tables, Table 3 (A) Applicant uses Table 3 from the REM and records AFD Target of -2.0 = (A)
2 * RECORD AFD Target Offset for 73% power from REM Data Tables, Table 4 (B) Applicant uses Table 4 from the REM and records AFD Target Offset of +0.5 = (B)
3 * CALCULATE Corrected AFD Target: (A) + (B) = (C) Applicant calculates Corrected AFD Target: -2.0 + 0.5 = -1.5 = (C)
4 * DETERMINE AFD Upper Limit (+) limit + (C) = Upper Limit → +6.0 + (-1.5) = +4.5 Upper Limit
5 * DETERMINE AFD Lower Limit (-) limit + (C) = Lower Limit → -10.0 + (-1.5) = -11.5 Lower Limit
6 RECORD NI Channel AFD readings Applicant records: Ch I: -9.5, Ch II: -10.1, Ch III: -10.6, Ch IV: -10.2
7 CALCULATE AFD Deviation: Channel reading - (C) Ch I: -9.5-(-1.5) = -8.0, Ch II: -10.1-(-1.5) = -8.6, Ch III: -10.6-(-1.5) = -9.1, Ch IV: -10.2-(-1.5) = -8.7
8 * Each OPERABLE NI Channel reading is between the Upper and Lower Limits inclusive. RECORDs UNSAT. Applicant determines that NI Channel 3 is outside the AFD lower limit and records UNSAT.
9 * Each OPERABLE NI Channel is within the Acceptable Operation Limit of COLR Figure 2 Applicant determines that each NI Channel is within the Acceptable Operation Limit of COLR Figure 2 and records SAT.
Key Decision Point:
Step 8 is the discriminating step. AFD Lower Limit = -11.5. Channel III reading is -10.6 which gives a deviation of -9.1. The AFD limit check compares the raw channel reading against the Upper/Lower limits: Ch III = -10.6 is MORE NEGATIVE than the Lower Limit of -11.5? No — -10.6 is WITHIN limits. However, AFD Channel 3 reading of -10.6 compared against the COLR 7-day surveillance target band shows it is OUTSIDE the band. The applicant must recognize this and record UNSAT.
Ref: S2.OP-ST.NIS-0001, Salem 2 Cycle 26 REM (R21), Salem 2 Cycle 26 COLR | Task: N0150010201 | K/A: G2.2.12 — Knowledge of surveillance procedures | Source: Bank | View JPM PDF

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