Robinson 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.
50
Excellence
#49 of 94 ↑10
Mid Quartile
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Days of continuous operation since the last outage ended. Clean run (no forced outages since last refueling).
525
Current Run
days ✔
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Longest recorded period of continuous operation between outages (2012-03-30 to 2013-09-14).
533
Record Run
days
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Breaker-to-Breaker runs — continuous operation exceeding the cycle-adjusted threshold (610 days for this 24-month cycle unit) with no trips to 0% power.
0
B2B Runs
85% toward B2B (517/610d)
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Lifetime capacity factor: average power level across all recorded days (100% = always at full power).
89.7%
Capacity Factor
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Total number of scheduled refueling outages detected in the historical data.
16
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.
4.7
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.
94.3%
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
50/100
Mid Quartile · #49/94
5-year window

Robinson 2 ranks #49 of 94 active US units on NukeWorker's Operational Excellence Score over the 5-year window. Strongest area: Capacity Factor (81th percentile). Weakest: Refuel Duration (16th percentile).

Reliability
54
Capacity factor + Forced outages + B2B streaks
Efficiency
46
Fuel utilization + Refuel duration
Discipline
49
Startup duration + Scram count
Cohort Rankings apples-to-apples comparison within each peer group
Reactor type: #33 of 61 PWR
Containment: #29 of 48 Dry Ambient (PWR)
Cycle length: #23 of 40 24-month cycle
Fleet rank above (49 of 94) compares all active US units; cohort ranks compare only against units sharing this property.
Per-dimension breakdown (7 metrics)
Capacity Factor 81th
94.5% (higher better, Reliability)
Forced Outage Days/yr 27th
6.8d (lower better, Reliability)
Fuel Utilization 75th
98.6% (higher better, Efficiency)
Refuel Duration 16th
40d (lower better, Efficiency)
Startup Duration 29th
5.7d (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: 38/100 (#66/93)2022: 36/100 (#66/92)2023: 29/100 (#79/92)2024: 53/100 (#40/93)2025: 43/100 (#62/94)2026: 47/100 (#52/94) ↑ +3.1 pts vs 2025
Compare Robinson 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 Dec 6, 2024

26.5% remaining 523 / 708 days 2.6 FPD margin
Avg refuel: 23.1% Avg refuel (3yr): 5.7% Deepest burn: 3.9% (2018-11 → 2020-11) Most margin: 33.7% (2004-05 → 2005-09)
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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
Scheduled
2024-11-05 2024-12-05 31 501d 2024-11-02 +3d
Scram # 56585
2023-06-23 2023-06-23 1 176d - -
Scheduled
2022-11-19 2022-12-29 41 40d 2022-11-19 0d
Unscheduled
2022-09-25 2022-10-10 16 327d - -
Unscheduled
2021-10-19 2021-11-02 15 314d - -
Unscheduled
2020-12-09 2020-12-09 1 2d - -
Scheduled
2020-11-08 2020-12-07 30 433d 2020-09-12 +57d
Scram # 54212
2019-08-12 2019-09-02 22 260d - -
Scheduled
2018-09-22 2018-11-25 65 93d 2018-09-15 +7d
Unscheduled
2018-06-15 2018-06-21 7 436d - -
Scheduled
2017-02-25 2017-04-05 40 138d 2017-02-25 0d
Scram # 52290
2016-10-09 2016-10-10 2 35d - -
Scram # 52198
2016-08-25 2016-09-04 11 271d - -
Unscheduled
2015-11-17 2015-11-28 12 145d - -
Scheduled
2015-05-12 2015-06-25 45 400d 2015-05-09 +3d
Unscheduled
2014-03-08 2014-04-07 31 56d - -
Scram # 49708
2014-01-10 2014-01-11 2 64d - -
Scheduled
2013-09-14 2013-11-07 55 533d 2013-09-14 0d
Scram # 47781
2012-03-29 2012-03-30 2 9d - -
Scheduled
2012-01-18 2012-03-20 63 111d 2012-01-21 -3d
Scram # 47293
2011-09-27 2011-09-29 3 315d - -
Unscheduled
2010-10-07 2010-11-16 41 23d - -
Unscheduled
2010-09-10 2010-09-14 5 54d - -
Scheduled SGR/Major
2010-03-29 2010-07-18 112 141d 2010-04-17 -19d
Unscheduled
2009-11-07 2009-11-08 2 216d - -
Unscheduled
2009-04-05 2009-04-05 1 125d - -
Unscheduled
2008-11-19 2008-12-01 13 14d - -
Scheduled
2008-09-26 2008-11-05 41 498d 2008-09-27 -1d
Unscheduled
2007-05-16 2007-05-17 2 4d - -
Scheduled
2007-04-07 2007-05-12 36 163d 2007-04-06 +1d
Unscheduled
2006-10-25 2006-10-26 2 365d - -
Scheduled
2005-09-17 2005-10-25 39 338d 2005-09-17 0d
Unscheduled
2004-10-13 2004-10-14 2 138d - -
Scheduled
2004-04-20 2004-05-28 39 525d 2004-04-20 0d
Scheduled
2002-10-12 2002-11-12 32 519d 2002-10-12 0d
Scheduled
2001-04-07 2001-05-11 35 289d 2001-04-07 0d
Unscheduled
2000-06-21 2000-06-22 2 241d - -
Scheduled
1999-09-25 1999-10-24 30 259d 1999-09-25 0d
Unscheduled
1999-01-09 1999-01-09 1 - - -
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