Peach Bottom 3

Online · 100% power

Constellation Energy·Delta, PA·BWR·1,285 MWe

Outage History Daily Power Log Get alerts

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.
Nov2025DecJan2026FebMarAprMayJunJulAugSepOctNovRefueling Outage: Oct 19, 2025 to Nov 2, 2025Power Ascension: Nov 3, 2025 to Nov 4, 2025Online: Nov 5, 2025 to Nov 23, 2025Reduced Power: Nov 24, 2025Online: Nov 25, 2025 to Mar 13, 2026Reduced Power: Mar 14, 2026Online: Mar 15, 2026 to May 28, 2026Reduced Power: May 29, 2026Online: May 30, 2026 to Aug 7, 2026Reduced Power: Aug 8, 2026Online: Aug 9, 2026 to Aug 15, 2026Reduced Power: Aug 16, 2026Online: Aug 17, 2026 to Sep 4, 2026Reduced Power: Sep 5, 2026Online: Sep 6, 2026 to Oct 19, 2026Today
OnlineReduced PowerPower AscensionRefueling Outage
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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
Rank locked · 93 units
Subscribers
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Days of continuous operation since the last outage ended. Clean run (no forced outages since last refueling).
351
Current Run
days ✔
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Longest recorded period of continuous operation between outages (2015-10-21 to 2017-10-23).
733
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.
9
B2B Runs
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Lifetime capacity factor: average power level across all recorded days (100% = always at full power).
94.6%
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.
21.92 TWh
Net Generation
EIA-923 · 12 mo to 2026-07 · plant total
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Total number of scheduled refueling outages detected in the historical data.
14
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.
1.7
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.
98.6%
Fuel Utilization
3yr avg

Reactor Status

Current Reactor Status Oct 19, 2026

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Current power output from NRC daily reactor status reports, updated Monday through Friday, except federal holidays. The gauge shows power level as a percentage of rated capacity. The sparkline shows the last 14 days of power history. Click to view the full unit dashboard.
Peach Bottom 3 is Online at 100% of rated power as of Oct 19, 2026. Over the last 14 reported days it has run between 100% and 100% power.
Peach Bottom 3 is Online Get alerts
100
PERCENT
0 200 400 600 800 1000 1200 1,285 RATED CAPACITY (1,285 MWe) 1,285 MWe
Current:
1,285 MWe
Powering 1,028,000 homes
Rated Capacity:
1,285 MWe
1,028,000 homes
14-Day Power History
Oct 6 Oct 19

Capacity Factor (365-Day)

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100%
Current
94.8%
365-Day Avg
#55
of 94 plants
Min: 0% Max: 100% 21 days <80%

Outage Days by Year

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Total days spent in outage each year, split by scheduled refueling (blue) and forced/unplanned (red). Lower totals indicate better reliability and outage execution. Hover for details.
Across its recorded history, Peach Bottom 3 has spent 332 days in scheduled refueling outages and 23 days in forced or unplanned outages. Taller bars mark the years with the most downtime.
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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

Peach Bottom 3 has 20 outages plotted here, averaging 18 days each. The most recent, in Oct 2025, was a scheduled refueling outage lasting 21 days.
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Scheduled refueling outage durations over time. Green bars are at or below this unit's average, amber up to 30% above it, red beyond that. The dashed line is the average. Shorter outages mean better execution.

Refueling Duration Trend

Peach Bottom 3 has completed 14 scheduled refueling outages on record, averaging 24 days each. The most recent, in Oct 2025, ran 21 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, Peach Bottom 3 takes about 4 days to climb from first power back to full power. That average is drawn from 14 startups on record, and the most recent took 2 days.
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Daily reactor power over the 120 days before each scheduled refueling outage, one line per refueling, lined up on the day the outage began. A coastdown is the slow decline as the fuel runs out near the end of a cycle. The highlighted line is the most recent refueling and fainter lines are older. Counts and medians cover coastdowns of a week or longer. A shutdown straight from full power, with no decline ahead of it, is what a forced outage looks like.

Coastdown Before Refueling

14 of 14 refuelings 40 days median 80% power at shutdown 0.4% per day
Peach Bottom 3 coasted down for a week or longer before 14 of its 14 refuelings on record. Those coastdowns ran a median of 40 days and ended near 80% power. The most recent refueling, in Oct 2025, followed a 41-day coastdown from 97% to 82%.
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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 Nov 3, 2025

51.6% remaining 3.2 FPD margin
Peach Bottom 3 has an estimated 51.6% of its fuel left. Across its last 13 cycles, it has refueled with an average of 3.3% remaining.
Avg refuel: 3.3% Avg refuel (3yr): 1.4% Deepest burn: 0.4% (2015-10 → 2017-10) Most margin: 7.7% (1999-10 → 2001-09)
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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

Over its operating life, Peach Bottom 3 has run at about 94.6% of its rated capacity. Across the last 12 reported months it averaged 98.3%. On the chart, green stretches near the top are full-power running, amber marks reduced power (50 to 89%), and red drops toward zero are outages.
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Estimated reactivity remaining in Peach Bottom 3's current fuel cycle, shown as a stylized fuel rod that drains as the cycle progresses. The cycle starts when the unit returns to power after its most recent refueling outage, and the gauge represents the fraction of that cycle's typical effective full-power days (EFPD) still available. Days at less than 100% power burn fuel proportionally — so a unit with significant downtime (high burn deficit) drains slower and ends with MORE reactivity left, giving operators margin to coast down (extend the cycle by reducing power) instead of refueling on the calendar. The dashed red line near the bottom marks the rough industry coastdown threshold (~15% remaining). Cycle target is the unit's median recent cycle length. Source: NRC daily reactor status reports cross-referenced against scheduled refuel outage history.

Fuel Burn Down Cycle since Nov 3, 2025

Peach Bottom 3 is 349 days into its current fuel cycle with an estimated 51.6% of its fuel left. Its typical cycle runs about 714 days.
Fresh — 100%
25% 50% 75% COASTDOWN ~8% DAY 0 DAY 714
Refuel — 0%
51.6% remaining
Mid-cycle
Cycle progress
349 / 714 days
EFPD remaining
368 days
Effective burn
346 EFPD
Burn deficit
3.2 FPD
Peach Bottom 3 is mid-cycle with healthy reactivity. Operators have flexibility to defer or advance the next refuel as needed.

Outage History & Daily Power Log

This table logs every recorded outage for Peach Bottom 3, 20 in all since 1999. Of those, 14 were scheduled refueling outages and 6 were unplanned or forced. The typical outage lasted about 18 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
Scheduled P3R25
2025-10-13 2025-11-02 21 716d 2025-10-20 -7d
Scheduled P3R24
2023-10-16 2023-10-28 13 709d 2023-10-16 0d
Scheduled P3R23
2021-10-25 2021-11-06 13 720d 2021-10-18 +7d
Scheduled P3R22
2019-10-21 2019-11-05 16 377d 2019-10-21 0d
Scram # 53630 Auto
2018-10-01 2018-10-09 9 6d - -
Unscheduled
2018-09-23 2018-09-25 3 321d - -
Scheduled P3R21
2017-10-23 2017-11-06 15 733d 2017-10-23 0d
Scheduled P3R20
2015-09-21 2015-10-21 31 704d 2015-09-13 +8d
Scheduled P3R19
2013-09-09 2013-10-17 39 697d 2013-09-08 +1d
Scheduled P3R18
2011-09-12 2011-10-13 32 298d 2011-09-11 +1d
Unscheduled
2010-11-16 2010-11-18 3 400d - -
Scheduled P3R17
2009-09-14 2009-10-12 29 231d 2009-09-13 +1d
Unscheduled
2009-01-22 2009-01-26 5 351d - -
Unscheduled
2008-02-06 2008-02-06 1 116d - -
Scheduled P3R16
2007-09-24 2007-10-13 20 709d 2007-09-23 +1d
Scheduled P3R15
2005-09-20 2005-10-15 26 710d 2005-09-19 +1d
Scheduled P3R14
2003-09-15 2003-10-11 27 707d 2003-09-15 0d
Scheduled P3R13
2001-09-15 2001-10-08 24 402d 2001-09-15 0d
Unscheduled
2000-08-08 2000-08-09 2 288d - -
Scheduled P3R12
1999-09-30 1999-10-25 26 - 1999-09-30 0d
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