Clinton - 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.
Oct2025NovDecJan2026FebMarAprMayJunJulAugSepRefueling Outage: Sep 11, 2025 to Oct 3, 2025Power Ascension: Oct 4, 2025 to Oct 6, 2025Scram: Oct 7, 2025Power Ascension: Oct 8, 2025 to Oct 13, 2025Online: Oct 14, 2025 to Oct 22, 2025Scram: Oct 23, 2025 to Oct 29, 2025Power Ascension: Oct 30, 2025 to Nov 1, 2025Online: Nov 2, 2025 to Dec 6, 2025Reduced Power: Dec 7, 2025Online: Dec 8, 2025 to Mar 7, 2026Reduced Power: Mar 8, 2026Online: Mar 9, 2026 to May 30, 2026Reduced Power: May 31, 2026Online: Jun 1, 2026 to Jun 20, 2026Reduced Power: Jun 21, 2026Online: Jun 22, 2026 to Sep 11, 2026Scram (reactor trip): Oct 6, 2025Scram (reactor trip): Oct 22, 2025Today
OnlineReduced PowerPower 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).
317
Current Run
days ✔
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Longest recorded period of continuous operation between outages (2019-10-16 to 2021-09-27).
712
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.
3
B2B Runs
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Lifetime capacity factor: average power level across all recorded days (100% = always at full power).
89.2%
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). Authoritative actuals, not an estimate.
8.35 TWh
Net Generation
EIA-923 · 12 mo to 2026-06
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Total number of scheduled refueling outages detected in the historical data.
17
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.
8.7
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.
98.8%
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: 39/100 (#65/93)2022: 55/100 (#43/92)2023: 55/100 (#36/92)2024: 66/100 (#20/92)2025: 54/100 (#34/92)2026: 53/100 (#36/93) Stable vs 2025
Compare Clinton 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

Clinton has 60 outages plotted here, averaging 11 days each. The most recent, in Oct 2025, was a unplanned outage lasting 7 days.
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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, Clinton takes about 7 days to climb from first power back to full power. That average is drawn from 16 startups on record, and the most recent took 10 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 5, 2025

53.4% remaining 15.4 FPD margin
Clinton has an estimated 53.4% of its fuel left. Across its last 16 cycles, it has refueled with an average of 22.1% remaining.
Avg refuel: 22.1% Avg refuel (3yr): 1.2% Deepest burn: 0.7% (2019-10 → 2021-09) Most margin: 55.4% (2017-06 → 2018-04)
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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, Clinton has run at about 89.2% of its rated capacity. Across the last 12 reported months it averaged 94.5%. 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 Clinton, 60 in all since 1999. Of those, 17 were scheduled refueling outages, 1 was planned maintenance and 42 were unplanned or forced. The typical outage lasted about 11 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 # 58002
2025-10-23 2025-10-29 7 16d - -
Scram # 57967
2025-10-07 2025-10-07 1 4d - -
Scheduled C1R22
2025-09-08 2025-10-03 26 701d 2025-09-08 0d
Scheduled C1R21
2023-09-11 2023-10-08 28 106d 2023-09-11 0d
Unscheduled Startup Hold
2023-05-28 2023-05-28 1 5d - -
Planned Mid-Cycle Planned
2023-05-13 2023-05-23 11 99d - -
Scram # 56328
2023-02-01 2023-02-03 3 379d - -
Unscheduled
2022-01-16 2022-01-18 3 79d - -
Unscheduled
2021-10-29 2021-10-29 1 4d - -
Scheduled C1R20
2021-09-27 2021-10-25 29 712d 2021-09-27 0d
Scheduled C1R19
2019-09-17 2019-10-16 30 43d 2019-09-16 +1d
Scram # 54197
2019-08-03 2019-08-05 3 272d - -
Scram # 53698
2018-10-29 2018-11-04 7 162d - -
Scheduled C1R18
2018-04-30 2018-05-20 21 136d 2018-04-30 0d
Scram # 53110
2017-12-10 2017-12-15 6 182d - -
Scram # 52800
2017-06-11 2017-06-11 1 9d - -
Scram # 52777
2017-05-31 2017-06-02 3 3d - -
Scheduled C1R17
2017-05-09 2017-05-28 20 348d 2017-05-08 +1d
Scheduled C1R16
2016-05-17 2016-05-26 10 367d 2016-10-26 (Model) -162d (Model)
Scheduled C1R15
2015-04-28 2015-05-16 19 94d 2015-04-27 +1d
Unscheduled
2015-01-22 2015-01-24 3 302d - -
Scram # 49958
2014-03-26 2014-03-26 1 3d - -
Unscheduled
2014-03-21 2014-03-23 3 97d - -
Scram # 49632
2013-12-14 2013-12-14 1 2d - -
Scram # 49617
2013-12-09 2013-12-12 4 42d - -
Scheduled C1R14
2013-10-08 2013-10-28 21 164d 2013-10-07 +1d
Scram # 48974
2013-04-27 2013-04-27 1 50d - -
Scram # 48812
2013-03-08 2013-03-08 1 444d - -
Scheduled # 47489 C1R13
2011-11-30 2011-12-20 21 664d 2011-11-30 0d
Scheduled C1R12
2010-01-11 2010-02-04 25 79d 2010-01-11 0d
Unscheduled
2009-10-16 2009-10-24 9 14d - -
Unscheduled
2009-09-30 2009-10-02 3 597d - -
Unscheduled Startup Hold
2008-02-11 2008-02-11 1 7d - -
Scheduled C1R11
2008-01-12 2008-02-04 24 206d 2008-01-14 -2d
Unscheduled
2007-06-20 2007-06-20 1 295d - -
Unscheduled
2006-08-28 2006-08-29 2 160d - -
Unscheduled
2006-03-21 2006-03-21 1 24d - -
Scheduled C1R10
2006-01-31 2006-02-25 26 324d 2006-01-30 +1d
Unscheduled
2005-03-12 2005-03-13 2 10d - -
Unscheduled
2005-02-23 2005-03-02 8 221d - -
Unscheduled
2004-07-14 2004-07-17 4 112d - -
Unscheduled
2004-03-23 2004-03-24 2 28d - -
Scheduled C1R9
2004-02-03 2004-02-24 22 61d 2004-02-03 0d
Unscheduled
2003-12-03 2003-12-04 2 235d - -
Unscheduled
2003-04-11 2003-04-12 2 281d - -
Unscheduled
2002-07-04 2002-07-04 1 52d - -
Unscheduled
2002-05-13 2002-05-13 1 9d - -
Scheduled C1R8
2002-04-02 2002-05-04 33 107d 2002-04-02 0d
Unscheduled
2001-12-16 2001-12-16 1 145d - -
Unscheduled
2001-07-24 2001-07-24 1 58d - -
Unscheduled
2001-05-26 2001-05-27 2 110d - -
Unscheduled
2001-02-04 2001-02-05 2 45d - -
Unscheduled
2000-12-19 2000-12-21 3 39d - -
Scheduled C1R7
2000-10-15 2000-11-10 27 67d 2000-10-15 0d
Unscheduled
2000-08-02 2000-08-09 8 58d - -
Unscheduled
2000-06-03 2000-06-05 3 12d - -
Unscheduled
2000-05-18 2000-05-22 5 362d - -
Unscheduled
1999-05-20 1999-05-22 3 2d - -
Unscheduled
1999-05-15 1999-05-18 4 9d - -
Scheduled C1R6SGR/Major
1999-01-01 1999-05-06 126 - 1999-01-01 0d
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