River Bend 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.
Oct2025NovDecJan2026FebMarAprMayJunJulAugSepOnline: Sep 11, 2025 to Sep 16, 2025Reduced Power: Sep 17, 2025Online: Sep 18, 2025 to Oct 9, 2025Scram: Oct 10, 2025 to Oct 11, 2025Reduced Power: Oct 12, 2025 to Oct 13, 2025Online: Oct 14, 2025 to Nov 11, 2025Forced Outage: Nov 12, 2025 to Nov 18, 2025Power Ascension: Nov 19, 2025 to Nov 21, 2025Online: Nov 22, 2025 to Mar 13, 2026Reduced Power: Mar 14, 2026Online: Mar 15, 2026 to Jun 12, 2026Reduced Power: Jun 13, 2026Online: Jun 14, 2026 to Jul 31, 2026Forced Outage: Aug 1, 2026 to Aug 8, 2026Power Ascension: Aug 9, 2026 to Aug 14, 2026Online: Aug 15, 2026 to Sep 11, 2026Scram (reactor trip): Oct 9, 2025Today
OnlineReduced PowerPower AscensionForced 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).
34
Current Run
days ✔
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Longest recorded period of continuous operation between outages (2021-04-07 to 2023-02-11).
675
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.
1
B2B Runs
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Lifetime capacity factor: average power level across all recorded days (100% = always at full power).
86.4%
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.
8.27 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.
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.
15.7
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.
86.9%
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: 11/100 (#91/93)2022: 11/100 (#89/92)2023: 16/100 (#89/92)2024: 38/100 (#69/92)2025: 14/100 (#90/92)2026: 18/100 (#88/93) ↑ +4.4 pts vs 2025
Compare River Bend 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

River Bend 1 has 80 outages plotted here, averaging 13 days each. The most recent, in Aug 2026, was a unplanned outage lasting 8 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, River Bend 1 takes about 8 days to climb from first power back to full power. That average is drawn from 15 startups on record, and the most recent took 14 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 Apr 3, 2025

24.6% remaining 35.4 FPD margin
River Bend 1 has an estimated 24.6% of its fuel left. Across its last 14 cycles, it has refueled with an average of 13.7% remaining.
Avg refuel: 13.7% Avg refuel (3yr): 13.1% Deepest burn: 0.0% (2011-02 → 2013-02) Most margin: 32.0% (2009-10 → 2011-01)
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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

Over its operating life, River Bend 1 has run at about 86.4% of its rated capacity. Across the last 12 reported months it averaged 93.7%. 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 River Bend 1, 80 in all since 1999. Of those, 15 were scheduled refueling outages and 65 were unplanned or forced. The typical outage lasted about 13 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
Unscheduled
2026-08-01 2026-08-08 8 256d - -
Unscheduled
2025-11-12 2025-11-18 7 32d - -
Scram # 57975
2025-10-10 2025-10-11 2 138d - -
Unscheduled
2025-05-22 2025-05-25 4 41d - -
Scram # 57655
2025-04-09 2025-04-11 3 10d - -
Scheduled RF-23
2025-02-11 2025-03-30 48 424d 2025-02-16 -5d
Scram # 56887
2023-12-13 2023-12-15 3 23d - -
Scram # 56863
2023-11-18 2023-11-20 3 5d - -
Unscheduled
2023-10-29 2023-11-13 16 136d - -
Scheduled RF-22SGR/Major
2023-02-11 2023-06-15 125 675d 2023-02-18 -7d
Scram # 55169
2021-04-03 2021-04-07 5 8d - -
Scram # 55154
2021-03-26 2021-03-26 1 7d - -
Scheduled RF-21
2021-02-21 2021-03-19 27 106d 2021-02-13 +8d
Unscheduled
2020-11-01 2020-11-07 7 68d - -
Scram # 54849
2020-08-22 2020-08-25 4 314d - -
Unscheduled
2019-10-11 2019-10-13 3 127d - -
Scram # 54096
2019-06-01 2019-06-06 6 21d - -
Scheduled RF-20
2019-03-30 2019-05-11 43 135d 2019-03-31 -1d
Unscheduled
2018-11-15 2018-11-15 1 2d - -
Scram # 53732
2018-11-10 2018-11-13 4 249d - -
Unscheduled
2018-03-02 2018-03-06 5 21d - -
Scram # 53192
2018-02-02 2018-02-09 8 3d - -
Unscheduled
2018-01-08 2018-01-30 23 141d - -
Scram # 52915
2017-08-19 2017-08-20 2 55d - -
Scram # 52825
2017-06-24 2017-06-25 2 105d - -
Scram # 52602
2017-03-11 2017-03-11 1 3d - -
Scheduled RF-19
2017-01-28 2017-03-08 40 218d 2017-01-27 +1d
Unscheduled
2016-06-11 2016-06-24 14 102d - -
Unscheduled
2016-02-18 2016-03-01 13 19d - -
Scram # 51644
2016-01-09 2016-01-30 22 38d - -
Scram # 51568
2015-11-28 2015-12-02 5 174d - -
Scram # 51112
2015-06-02 2015-06-07 6 67d - -
Scheduled RF-18
2015-02-23 2015-03-27 33 58d 2015-02-16 +7d
Scram # 50704
2014-12-26 2014-12-27 2 65d - -
Scram # 50546
2014-10-17 2014-10-22 6 485d - -
Unscheduled
2013-06-17 2013-06-19 3 91d - -
Scheduled RF-17
2013-02-17 2013-03-18 30 254d 2013-02-17 0d
Unscheduled
2012-06-03 2012-06-08 6 2d - -
Scram # 47960
2012-05-25 2012-06-01 8 2d - -
Scram # 47960
2012-05-22 2012-05-23 2 14d - -
Unscheduled
2012-05-04 2012-05-08 5 131d - -
Scram # 47549
2011-12-24 2011-12-25 2 317d - -
Scheduled RF-16
2011-01-15 2011-02-10 27 164d 2011-01-16 -1d
Unscheduled
2010-07-31 2010-08-04 5 287d - -
Scheduled RF-15
2009-09-21 2009-10-17 27 365d 2009-09-25 -4d
Unscheduled
2008-09-02 2008-09-21 20 164d - -
Unscheduled
2008-03-21 2008-03-22 2 15d - -
Unscheduled
2008-03-06 2008-03-06 1 5d - -
Scheduled RF-14
2008-01-07 2008-03-01 55 58d 2007-10-01 +98d
Unscheduled
2007-11-07 2007-11-10 4 35d - -
Unscheduled
2007-09-27 2007-10-03 7 111d - -
Unscheduled
2007-05-23 2007-06-08 17 17d - -
Unscheduled
2007-05-05 2007-05-06 2 196d - -
Unscheduled
2006-10-19 2006-10-21 3 160d - -
Scheduled RF-13
2006-04-24 2006-05-12 19 7d 2006-04-23 +1d
Unscheduled
2006-04-16 2006-04-17 2 58d - -
Unscheduled
2006-02-11 2006-02-17 7 224d - -
Unscheduled
2005-07-02 2005-07-02 1 2d - -
Unscheduled
2005-06-23 2005-06-30 8 110d - -
Unscheduled
2005-03-01 2005-03-05 5 4d - -
Unscheduled
2005-02-20 2005-02-25 6 36d - -
Unscheduled
2005-01-15 2005-01-15 1 35d - -
Unscheduled
2004-12-11 2004-12-11 1 23d - -
Scheduled RF-12
2004-10-22 2004-11-18 28 16d 2004-10-21 +1d
Unscheduled
2004-10-02 2004-10-06 5 47d - -
Unscheduled
2004-08-15 2004-08-16 2 327d - -
Unscheduled
2003-09-23 2003-09-23 1 166d - -
Scheduled RF-11
2003-03-17 2003-04-10 25 22d 2003-03-17 0d
Unscheduled
2003-02-22 2003-02-23 2 155d - -
Unscheduled
2002-09-19 2002-09-20 2 79d - -
Unscheduled
2002-07-02 2002-07-02 1 48d - -
Unscheduled
2002-05-13 2002-05-15 3 196d - -
Unscheduled
2001-10-27 2001-10-29 3 17d - -
Scheduled RF-10
2001-09-24 2001-10-10 17 154d 2001-09-24 0d
Unscheduled
2001-04-22 2001-04-23 2 2d - -
Unscheduled
2001-04-18 2001-04-20 3 236d - -
Unscheduled
2000-08-22 2000-08-25 4 137d - -
Scheduled RF-9
2000-03-04 2000-04-07 35 126d 2000-03-04 0d
Unscheduled
1999-10-30 1999-10-30 1 122d - -
Unscheduled
1999-04-03 1999-06-30 89 - - -
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