JPM RO-A3 — Perform Manual QPTR Calculation Surveillance
Admin | RO/SRO | G2.2.12 (3.7)
Location: Classroom
Time-Critical: No
Alternate Path: No
Estimated Time: 20 minutes
Initial Conditions:
- Unit 2 was operating at 100% power when rod 2D4 dropped fully into the core. OHAs E-46, LOWER SECT DEV ABV 50% PWR, and E-38 UPPER SECT DEV ABV 50% PWR, annunciated, cleared and continue to annunciate then clear.
- Operators have not yet started reducing power to 74% to comply with TSAS 3.1.3.1.c.3.d IAW S2.OP-AB.ROD-0002, Dropped Rod.
Initiating Cue:
- The CRS has directed you to perform a Manual QPTR Calculation IAW S2.OP-ST.NIS-0002. Maintain all calculations at three significant digits to the right of the decimal point (Thousandths) unless otherwise directed by procedure.
- All pre-requisites are completed SAT.
- Notify CRS of test results after Step 5.3 is complete and compliance with Technical Specification.
- NI currents are:
Time-Critical: No
Alternate Path: No
Estimated Time: 20 minutes
Initial Conditions:
- Unit 2 was operating at 100% power when rod 2D4 dropped fully into the core. OHAs E-46, LOWER SECT DEV ABV 50% PWR, and E-38 UPPER SECT DEV ABV 50% PWR, annunciated, cleared and continue to annunciate then clear.
- Operators have not yet started reducing power to 74% to comply with TSAS 3.1.3.1.c.3.d IAW S2.OP-AB.ROD-0002, Dropped Rod.
Initiating Cue:
- The CRS has directed you to perform a Manual QPTR Calculation IAW S2.OP-ST.NIS-0002. Maintain all calculations at three significant digits to the right of the decimal point (Thousandths) unless otherwise directed by procedure.
- All pre-requisites are completed SAT.
- Notify CRS of test results after Step 5.3 is complete and compliance with Technical Specification.
- NI currents are:
| Upper Detectors | Lower Detectors | |
|---|---|---|
| N41 | 189 | 188 |
| N42 | 206 | 221 |
| N43 | 192 | 193 |
| N44 | 135 | 151 |
Task Standard:
1. Manually calculates the highest QPTR as UNSAT (highest N42T AND N42B) with a value of 1.041 and 1.032 respectively (+/- 0.002).
2. Identifies Maximum Power Tilt exceeds 1.02 and identifies T/S LCO 3.2.4 is NOT met.
1. Manually calculates the highest QPTR as UNSAT (highest N42T AND N42B) with a value of 1.041 and 1.032 respectively (+/- 0.002).
2. Identifies Maximum Power Tilt exceeds 1.02 and identifies T/S LCO 3.2.4 is NOT met.
▶ Show Critical Steps & Key Actions
| Step | Critical Element | Standard |
|---|---|---|
| 3.0 | Read Precautions and Limitations 3.1-3.5 | Reads P&Ls prior to performing calculations |
| 5.1.2 | Record date, time, reactor power, and reason for QPTR on Attachment 2 | Records current date/time, 100% reactor power, and OHA E-46 as reason |
| 5.1.3 | Record NI currents and 100% NI current values from REM on Attachment 1 | Records N41-44 upper and lower detector currents and 100% values from S2.RE-RA.ZZ-0011 Table 2 |
| 5.1.4 * | Complete Attachment 1 QPTR calculations | For each upper and lower detector: calculates detector ratio (current/100% value), sums ratios, divides by number of operable detectors (4) to get average, divides each ratio by average to get power tilt |
| 5.1.5 * | Record Power Tilt, Maximum Power Tilt, and test results on Attachment 2 | Maximum Power Tilt for N42T = 1.041 and N42B = 1.032 (+/- 0.002). Marks UNSAT. |
| 5.1.6 | Direct Independent Verification of Attachment 1 calculations | CUE: IV is complete SAT |
| 5.1.7 * | Determine Maximum Power Tilt exceeds 1.02 and refer to TS 3.2.4 | Determines QPTR exceeds 1.02 limit and TS LCO 3.2.4 is NOT met |
| 5.3.2 * | Record surveillance as UNSAT, initiate NOTF | Records surveillance as UNSAT. CRS initiates NOTF and notifies Reactor Engineering. |
Answer Key (Upper Detectors):
Answer Key (Lower Detectors):
| Det | Current | 100% Val | Ratio | Avg | Power Tilt |
|---|---|---|---|---|---|
| N41T | 189 | 221.1 | 0.855 | 0.864 | 0.990 |
| N42T | 206 | 229.1 | 0.899 | 0.864 | 1.041 |
| N43T | 192 | 218.6 | 0.878 | 0.864 | 1.016 |
| N44T | 135 | 163.7 | 0.825 | 0.864 | 0.955 |
| Det | Current | 100% Val | Ratio | Avg | Power Tilt |
|---|---|---|---|---|---|
| N41B | 188 | 226 | 0.832 | 0.878 | 0.948 |
| N42B | 221 | 243.8 | 0.906 | 0.878 | 1.032 |
| N43B | 193 | 215.6 | 0.895 | 0.878 | 1.019 |
| N44B | 151 | 172.1 | 0.877 | 0.878 | 0.999 |
Key Decision Point:
Step 5.1.7 is the discriminating step -- after completing the multi-step calculation, the applicant must recognize that the Maximum Power Tilt (N42T = 1.041, N42B = 1.032) exceeds the TS 3.2.4 limit of 1.02 and declare TS LCO 3.2.4 NOT met. The dropped rod (2D4) in the N42 quadrant causes asymmetric flux distribution. The applicant must mark the surveillance UNSAT and initiate corrective actions.
Step 5.1.7 is the discriminating step -- after completing the multi-step calculation, the applicant must recognize that the Maximum Power Tilt (N42T = 1.041, N42B = 1.032) exceeds the TS 3.2.4 limit of 1.02 and declare TS LCO 3.2.4 NOT met. The dropped rod (2D4) in the N42 quadrant causes asymmetric flux distribution. The applicant must mark the surveillance UNSAT and initiate corrective actions.
Ref: S2.OP-ST.NIS-0002 (Rev 15), REM Salem 2 Cycle 25 (Rev 33) | Task: N0150020201 | K/A: G2.2.12 — Knowledge of surveillance procedures | Source: Bank (Rev 06) | View JPM PDF
Connections
- Related systems: Excore NIs
- Related tech specs: TS 3/4.2 — Power Distribution
- Related procedures: S2.OP-ST.NIS-0002 — Power Distribution QPTR Surveillance, AB.ROD-0002 — Dropped Rod
- Related exam: 2022 NRC Operating Exam