LaSalle 2 - Status & History

Comprehensive reactor performance metrics, cycle analysis, and historical outage data.

Plant Info Outage History Daily Power Log
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Composite Operational Excellence Score (0-100) — average percentile rank across 7 dimensions in three sub-scores: Reliability (capacity factor, forced outage days, B2B avg streak), Efficiency (fuel utilization, refuel duration), and Discipline (startup duration, scram count). 5-year window. Higher = more operationally excellent. Click to see the full breakdown.
79
Excellence
#7 of 94 →
Top Quartile
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Days of continuous operation since the last outage ended. Clean run (no forced outages since last refueling).
167
Current Run
days ✔
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Longest recorded period of continuous operation between outages (2019-03-09 to 2021-02-22).
716
Record Run
days
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Breaker-to-Breaker runs — continuous operation exceeding the cycle-adjusted threshold (623 days for this 24-month cycle unit) with no trips to 0% power.
5
B2B Runs
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Lifetime capacity factor: average power level across all recorded days (100% = always at full power).
92.6%
Capacity Factor
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Total number of scheduled refueling outages detected in the historical data.
15
Outages
since 1999
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Average time from first power generation (>0%) to sustained full power (≥95% for 2+ days) across the last 3 scheduled outages. Click to compare against the fleet on the Operator Efficiency Leaderboard.
3.3
Avg Startup
days (last 3)
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Average fuel utilization — percent of the designed fuel cycle that this unit consumes before refueling, derived from the historical burn-down trajectory. Higher = more efficient operator (refuels with less margin remaining; closer to coastdown). Computed as 100% minus the unit's average refuel-point fuel %, using the last 3 years where available, otherwise lifetime average. Click to compare against the fleet on the Operator Efficiency Leaderboard.
99.5%
Fuel Utilization
3yr avg
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NukeWorker's Operational Excellence Score is a composite 0–100 ranking of every active US nuclear unit across 7 publicly observable performance metrics, grouped into three sub-scores:
• Reliability — capacity factor, forced outage days, B2B avg streak
• Efficiency — fuel utilization, refuel duration
• Discipline — startup duration, scram count
Each unit's metric is converted to a percentile across the active fleet. Sub-score = average of its components; composite = average of the three sub-scores. Use the time-window toggle below to switch between 3yr / 5yr / lifetime.
Time window — change how far back we look
NukeWorker's
Operational
Excellence Score
79/100
Top Quartile · #7/94
5-year window

LaSalle 2 ranks #7 of 94 active US units on NukeWorker's Operational Excellence Score over the 5-year window. Strongest area: Fuel Utilization (98th percentile). Weakest: Forced Outage Days/yr (55th percentile).

Reliability
70
Capacity factor + Forced outages + B2B streaks
Efficiency
90
Fuel utilization + Refuel duration
Discipline
78
Startup duration + Scram count
Cohort Rankings apples-to-apples comparison within each peer group
Reactor type: #3 of 31 BWR
Containment: #2 of 8 Mark II (BWR)
Cycle length: #5 of 40 24-month cycle
Fleet rank above (7 of 94) compares all active US units; cohort ranks compare only against units sharing this property.
Per-dimension breakdown (7 metrics)
Capacity Factor 68th
93.4% (higher better, Reliability)
Forced Outage Days/yr 55th
3.2d (lower better, Reliability)
B2B Avg Streak 87th
702d (higher better, Reliability)
Fuel Utilization 98th
99.3% (higher better, Efficiency)
Refuel Duration 81th
23d (lower better, Efficiency)
Startup Duration 87th
3.2d (lower better, Discipline)
Scrams (5-year) 70th
0.2/yr (lower better, Discipline)

Each dimension's percentile is computed across the active US fleet (94 units with sufficient history). Sub-score = average of its component percentiles. Composite = average of the three sub-scores. 5-year window. View full leaderboard →

Methodology

NukeWorker's Operational Excellence Score is a composite ranking that combines 7 publicly observable performance metrics into a single 0-100 number per US nuclear unit.

How it's computed: Each unit's raw value is converted to a percentile (0-100) within the 94 active US units that have at least 2 completed refueling cycles. The 7 percentiles are averaged into 3 sub-scores (Reliability, Efficiency, Discipline), and those are averaged into the final composite.

Active window — 5-year:

  • Reliability — Capacity factor (5yr), forced outage days/yr (5yr), B2B avg streak (lifetime)
  • Efficiency — in-cycle fuel utilization (3yr), median refuel duration (5yr)
  • Discipline — robust mean startup duration, scrams/yr (5yr, annualised)

Cohort rankings: alongside the fleet rank, each unit gets ranked within its reactor type (PWR/BWR), containment design (Ice Condenser, Mark I, etc.), and cycle length (12/18/24-month). Useful for apples-to-apples comparisons.

What's excluded: subjective community ratings, confidential INPO ratings, financial metrics. We only use publicly available NRC + cycle data.

Why three windows? 5yr (default) is the industry standard. 3yr captures recent operational changes and post-pandemic recovery. Lifetime gives newer units a fair comparison and reveals long-term consistency.

Edge cases: units with fewer than 2 cycles (e.g., Vogtle 4) show "Provisional". Decommissioned units excluded.

Refresh cadence: recomputed daily. Each window cached separately.

A data-derived proxy for operational performance; not affiliated with INPO. INPO ratings are confidential and qualitative — ours is public and quantitative.

5-yr trend: 2021: 57/100 (#43/93)2022: 44/100 (#58/92)2023: 80/100 (#12/92)2024: 51/100 (#44/93)2025: 73/100 (#18/94)2026: 74/100 (#18/94) Stable vs 2025
Compare LaSalle 2 head-to-head with up to 3 other units. Compare now
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Duration of each outage in days, shown chronologically. Green bars are scheduled refueling outages, red bars are forced/unscheduled. The orange dashed line marks the average duration. Extended outages (>180 days) and D&D periods are excluded.

Outage Duration Trend

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Days between consecutive scheduled refueling outage starts, showing operating cycle regularity. The purple dashed line marks the average cycle length. Most U.S. reactors operate on 18-month (547 day) or 24-month (730 day) cycles.

Cycle Length History

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Time in days from first power generation (>0%) to sustained full power (≥95% for 2+ consecutive days) after each scheduled refueling outage. The dashed line marks the average. Includes startup testing holds and power dips.

Startup Duration Trend

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Estimated fuel remaining in the current cycle, expressed as a percentage of the unit's typical cycle. Starts at 100% when the unit returns to power post-refuel and drops as full-power-days are burned. Days at reduced power burn fuel proportionally — so a unit with significant downtime (high burn deficit) drops slower and ends up with MORE fuel left than its calendar position would suggest. Coastdown threshold around 15%. Toggle to overlay past cycles on a normalized "days into cycle" axis to see how aggressively this unit historically burns down before refuel.

Fuel Burn Down Cycle since Mar 2, 2025

40.5% remaining 437 / 703 days 18.4 FPD margin
Avg refuel: 10.5% Avg refuel (3yr): 0.5% Deepest burn: 0.0% (2005-03 → 2007-02) Most margin: 65.4% (2002-04 → 2003-01)
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Monthly capacity factor with outage events overlaid as red bands. Green bars show average power level per month. Toggle to Daily view for raw daily data.

Power History

Type ⇅ Actual Start ⇅ Actual End ⇅ Duration ⇅ Days Online ⇅ Scheduled Delta
Unscheduled
2025-11-19 2025-11-28 10 263d - -
Scheduled
2025-02-10 2025-03-01 20 705d 2025-02-11 -1d
Scheduled
2023-02-13 2023-03-08 24 137d 2023-02-13 0d
Scram # 56120
2022-09-26 2022-09-29 4 527d - -
Scheduled
2021-02-22 2021-04-17 55 716d 2021-02-22 0d
Scheduled
2019-02-18 2019-03-09 20 168d 2019-02-18 0d
Scram # 53576
2018-09-01 2018-09-03 3 450d - -
Unscheduled
2017-06-07 2017-06-08 2 91d - -
Scheduled
2017-02-06 2017-03-08 31 12d 2017-02-06 0d
Scram # 52505
2017-01-24 2017-01-25 2 531d - -
Unscheduled
2015-08-08 2015-08-12 5 162d - -
Scheduled
2015-02-02 2015-02-27 26 170d 2015-02-02 0d
Scram # 50346
2014-08-06 2014-08-16 11 93d - -
Unscheduled
2014-04-28 2014-05-05 8 364d - -
Scram # 48969
2013-04-26 2013-04-29 4 2d - -
Scram # 48939
2013-04-18 2013-04-24 7 46d - -
Scram # 48939
2013-04-18 2013-04-24 7 6d - -
Scheduled
2013-02-11 2013-03-03 21 708d 2013-02-11 0d
Scheduled
2011-02-15 2011-03-06 20 488d 2011-02-21 -6d
Unscheduled
2009-10-13 2009-10-15 3 56d - -
Unscheduled
2009-08-16 2009-08-18 3 188d - -
Scheduled
2009-01-19 2009-02-09 22 675d 2009-01-19 0d
Scheduled
2007-02-26 2007-03-16 19 712d 2007-02-25 +1d
Scheduled
2005-02-07 2005-03-16 38 577d 2005-02-07 0d
Unscheduled
2003-07-08 2003-07-11 4 139d - -
Scheduled
2003-01-22 2003-02-19 29 9d 2003-01-22 0d
Unscheduled
2003-01-11 2003-01-13 3 67d - -
Unscheduled
2002-11-03 2002-11-05 3 2d - -
Unscheduled
2002-10-25 2002-11-01 8 184d - -
Scheduled
2002-04-09 2002-04-24 16 214d 2002-04-09 0d
Unscheduled
2001-09-07 2001-09-07 1 2d - -
Unscheduled
2001-09-04 2001-09-05 2 98d - -
Unscheduled
2001-05-28 2001-05-29 2 51d - -
Unscheduled
2001-04-07 2001-04-07 1 126d - -
Unscheduled Startup Hold
2000-12-02 2000-12-02 1 3d - -
Scheduled
2000-11-10 2000-11-29 20 140d 2000-11-10 0d
Unscheduled
2000-06-23 2000-06-23 1 218d - -
Unscheduled
1999-11-17 1999-11-18 2 86d - -
Unscheduled
1999-08-22 1999-08-23 2 135d - -
Scheduled SGR/Major
1999-01-01 1999-04-09 99 - 1999-01-01 0d
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