Saint Lucie 1 - Status & History

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

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Reactor Status Timeline

Online NRC data, Mon to Fri ? Actual daily reactor status from NRC reports (Mon to Fri) and the current state. What is coming -- the utility's published Scheduled outage and NukeWorker's model Projection -- is part of a subscription. Colored by status. How far ahead you can see depends on your plan.
Oct2025NovDecJan2026FebMarAprMayJunJulAugSepOctCoastdown: Sep 19, 2025Refueling Outage (SL1-33): Sep 20, 2025 to Oct 30, 2025SL1-33Power Ascension: Oct 31, 2025 to Nov 2, 2025Online: Nov 3, 2025 to Aug 13, 2026Scram: Aug 14, 2026Reduced Power: Aug 15, 2026Online: Aug 16, 2026 to Sep 19, 2026Scram (reactor trip): Aug 13, 2026Today
OnlineReduced PowerCoastdownPower AscensionRefueling OutageScram⚡Scram (reactor trip)
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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.
   
Excellence
ranked of 93
Subscribers
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Days of continuous operation since the last outage ended. Clean run (no forced outages since last refueling).
36
Current Run
days ✔
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Longest recorded period of continuous operation between outages (2022-10-04 to 2024-03-09).
522
Record Run
days
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Breaker-to-Breaker runs — continuous operation exceeding the cycle-adjusted threshold set for this unit with no trips to 0% power.
7
B2B Runs
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Lifetime capacity factor: average power level across all recorded days (100% = always at full power).
88.6%
Capacity Factor
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Net electricity actually generated over the most recent 12 months reported by the U.S. EIA (Form EIA-923), summed across every unit at this plant. Authoritative actuals, not an estimate.
15.12 TWh
Net Generation
EIA-923 · 12 mo to 2026-06 · plant total
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Total number of scheduled refueling outages detected in the historical data.
18
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.
2.7
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.
98.3%
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 measured 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
5-yr trend: 2021: 20/100 (#83/93)2022: 17/100 (#87/92)2023: 19/100 (#86/92)2024: 28/100 (#79/92)2025: 28/100 (#80/92)2026: 31/100 (#77/93) ↑ +2.4 pts vs 2025
Compare Saint Lucie 1 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

Saint Lucie 1 has 48 outages plotted here, averaging 21 days each. The most recent, in Aug 2026, was a unplanned outage lasting 1 day.
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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

After a refueling outage, Saint Lucie 1 takes about 3 days to climb from first power back to full power. That average is drawn from 17 startups on record, and the most recent took 3 days.
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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 Oct 31, 2025

38.6% remaining 2.8 FPD margin
Saint Lucie 1 has an estimated 38.6% of its fuel left. Across its last 17 cycles, it has refueled with an average of 5.2% remaining.
Avg refuel: 5.2% Avg refuel (3yr): 1.7% Deepest burn: 0.0% (1999-10 → 2001-04) Most margin: 10.8% (2005-12 → 2007-04)
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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

Over its operating life, Saint Lucie 1 has run at about 88.6% of its rated capacity. Across the last 12 reported months it averaged 91.0%. On the chart, flat stretches near the top are full-power running and drops to zero are outages.
This table logs every recorded outage for Saint Lucie 1, 48 in all since 1999. Of those, 18 were scheduled refueling outages and 30 were unplanned or forced. The typical outage lasted about 21 days. Where the Scheduled column shows (Model), the date is a NukeWorker projection because the utility had not published one.
Type ⇅ Actual Start ⇅ Actual End ⇅ Duration ⇅ Days Online ⇅ Scheduled Delta
Scram # 58408
2026-08-14 2026-08-14 1 288d - -
Scheduled SL1-33
2025-09-20 2025-10-30 41 307d 2025-09-20 0d
Scram # 57425
2024-11-16 2024-11-17 2 105d - -
Scram # 57249
2024-07-29 2024-08-03 6 108d - -
Scheduled SL1-32
2024-03-09 2024-04-12 35 522d 2024-03-08 +1d
Scheduled # 56087 SL1-31
2022-09-03 2022-10-04 32 266d 2022-09-03 0d
Scram # 55641
2021-12-11 2021-12-11 1 208d - -
Scheduled SL1-30
2021-04-10 2021-05-17 38 509d 2021-04-10 0d
Scheduled SL1-29
2019-10-14 2019-11-18 36 23d 2019-09-03 +41d
Scram # 54262
2019-09-08 2019-09-21 14 81d - -
Scram # 54027
2019-04-26 2019-06-19 55 178d - -
Scram # 53703
2018-10-30 2018-10-30 1 202d - -
Scheduled SL1-28
2018-03-12 2018-04-11 31 181d 2018-03-12 0d
Unscheduled
2017-09-12 2017-09-12 1 217d - -
Unscheduled
2017-02-01 2017-02-07 7 86d - -
Scheduled SL1-27
2016-09-26 2016-11-07 43 32d 2016-09-26 0d
Scram # 52191
2016-08-22 2016-08-25 4 2d - -
Unscheduled
2016-08-02 2016-08-20 19 357d - -
Scram # 51302
2015-08-10 2015-08-11 2 110d - -
Scheduled SL1-26
2015-03-23 2015-04-22 31 460d 2015-03-23 0d
Unscheduled
2013-12-11 2013-12-18 8 29d - -
Scram # 49528
2013-11-12 2013-11-12 1 5d - -
Scheduled SL1-25
2013-09-30 2013-11-07 39 183d 2013-09-29 +1d
Scram # 48818
2013-03-13 2013-03-31 19 232d - -
Unscheduled
2012-07-19 2012-07-24 6 44d - -
Scram # 47987
2012-06-03 2012-06-05 3 51d - -
Unscheduled
2012-04-07 2012-04-13 7 2d - -
Scram # 47793
2012-03-31 2012-04-05 6 2d - -
Scheduled SL1-24SGR/Major
2011-11-28 2012-03-29 123 32d 2011-11-23 +5d
Unscheduled
2011-10-26 2011-10-27 2 6d - -
Scram # 47353
2011-10-20 2011-10-20 1 55d - -
Scram # 47178
2011-08-23 2011-08-26 4 423d - -
Unscheduled
2010-06-17 2010-06-26 10 4d - -
Scheduled SL1-23
2010-04-05 2010-06-13 70 501d 2010-04-05 0d
Scheduled SL1-22
2008-10-20 2008-11-20 32 57d 2008-10-19 +1d
Unscheduled
2008-08-21 2008-08-24 4 453d - -
Scheduled SL1-21
2007-04-02 2007-05-26 55 470d 2007-04-01 +1d
Scheduled SL1-20
2005-10-17 2005-12-18 63 380d 2005-10-16 +1d
Unscheduled
2004-09-26 2004-10-02 7 13d - -
Unscheduled
2004-09-05 2004-09-13 9 134d - -
Scheduled SL1-19
2004-03-22 2004-04-24 34 515d 2004-03-21 +1d
Scheduled SL1-18
2002-09-30 2002-10-24 25 323d 2002-09-30 0d
Unscheduled
2001-11-09 2001-11-11 3 156d - -
Unscheduled
2001-06-06 2001-06-06 1 38d - -
Scheduled SL1-17
2001-04-02 2001-04-29 28 520d 2001-04-02 0d
Unscheduled
1999-10-29 1999-10-30 2 12d - -
Scheduled SL1-16
1999-09-13 1999-10-17 35 18d 1999-09-13 0d
Unscheduled
1999-08-24 1999-08-26 3 - - -
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