Watts Bar 2

Online · 100% power

Tennessee Valley Authority·Spring City, TN·PWR·1,122 MWe

Data refreshed 9.3h ago Rx Status: Oct 19, 2026 at 5:12 AM (M-F)

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.
Nov2025DecJan2026FebMarAprMayJunJulAugSepOctNovOnline: Oct 19, 2025 to Aug 11, 2026Reduced Power: Aug 12, 2026Online: Aug 13, 2026 to Oct 19, 2026Today
OnlineReduced Power
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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 (Started 2025-07-16). Clean run (no forced outages since last refueling).
460
Current Run
days ✔
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Longest recorded period of continuous operation between outages (2025-07-16 to Present).
460
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.
0
B2B Runs
99% toward B2B (456/459d)
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Lifetime capacity factor: average power level across all recorded days (100% = always at full power).
84.4%
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), summed across every unit at this plant. Authoritative actuals, not an estimate.
19.81 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.
6
Outages
since 2016
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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.
3.3
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.
100.0%
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.
Watts Bar 2 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.
Watts Bar 2 is Online Get alerts
100
PERCENT
0 200 400 600 800 1000 1,122 RATED CAPACITY (1,122 MWe) 1,122 MWe
Current:
1,122 MWe
Powering 897,600 homes
Rated Capacity:
1,122 MWe
897,600 homes
14-Day Power History
Oct 6 Oct 19

Capacity Factor (365-Day)

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100%
Current
99.6%
365-Day Avg
#17
of 94 plants
Min: 80% Max: 100% 0 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, Watts Bar 2 has spent 275 days in scheduled refueling outages and 208 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

Watts Bar 2 has 22 outages plotted here, averaging 22 days each. The most recent, in Jul 2025, was a unplanned outage lasting 3 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

Watts Bar 2 has completed 6 scheduled refueling outages on record, averaging 46 days each. The most recent, in Apr 2025, ran 31 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, Watts Bar 2 takes about 5 days to climb from first power back to full power. That average is drawn from 5 startups on record, and the most recent took 3 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

0 of 6 refuelings
Watts Bar 2 has not coasted down for a week or longer before any of its 6 refuelings on record. It holds power until the shutdown itself.
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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 May 13, 2025

0.0% remaining 5.9 FPD margin
Watts Bar 2 has an estimated 0.0% of its fuel left. Across its last 5 cycles, it has refueled with an average of 5.0% remaining.
Avg refuel: 5.0% Avg refuel (3yr): 0.0% Deepest burn: 0.0% (2019-05 → 2020-10) Most margin: 17.4% (2020-11 → 2022-03)
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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, Watts Bar 2 has run at about 84.4% of its rated capacity. Across the last 12 reported months it averaged 99.6%. 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 Watts Bar 2'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 May 13, 2025

Watts Bar 2 is 524 days into its current fuel cycle with an estimated 0.0% of its fuel left. Its typical cycle runs about 490 days.
Fresh — 100%
25% 50% 75% COASTDOWN ~1% DAY 0 DAY 490
Refuel — 0%
0.0% remaining
Refuel imminent
Cycle progress
524 / 490 days
EFPD remaining
0 days
Effective burn
518 EFPD
Burn deficit
5.9 FPD
Watts Bar 2 is at the end of its fuel cycle. Refuel outage is imminent.

Outage History & Daily Power Log

This table logs every recorded outage for Watts Bar 2, 22 in all since 2016. Of those, 6 were scheduled refueling outages and 16 were unplanned or forced. The typical outage lasted about 22 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 # 57810 Auto
2025-07-14 2025-07-16 3 63d - -
Scheduled U2R6
2025-04-12 2025-05-12 31 402d 2025-04-11 +1d
Scram # 57006 Auto
2024-03-05 2024-03-06 2 35d - -
Scram # 56935 Auto
2024-01-28 2024-01-30 3 62d - -
Scheduled U2R5
2023-11-04 2023-11-27 24 91d 2023-11-03 +1d
Scram # 56660 Auto
2023-08-05 2023-08-05 1 37d - -
Scram # 56593 Auto
2023-06-28 2023-06-29 2 363d - -
Scheduled U2R4SGR/Major
2022-03-02 2022-06-30 121 152d 2022-02-28 +2d
Unscheduled
2021-09-11 2021-10-01 21 177d - -
Scram # 55143 Auto
2021-03-18 2021-03-18 1 119d - -
Scheduled U2R3
2020-10-24 2020-11-19 27 146d 2020-10-24 0d
Unscheduled
2020-05-16 2020-05-31 16 360d - -
Scram # 54077 Manual
2019-05-22 2019-05-22 1 7d - -
Scheduled U2R2
2019-04-13 2019-05-15 33 66d 2019-04-13 0d
Unscheduled
2019-02-03 2019-02-06 4 160d - -
Scram # 53557 Auto
2018-08-23 2018-08-27 5 56d - -
Scram # 53467 Auto
2018-06-23 2018-06-28 6 71d - -
Scram # 53327 Auto
2018-04-13 2018-04-13 1 120d - -
Scram # 53112 Manual
2017-12-12 2017-12-14 3 7d - -
Scheduled U2R1
2017-10-28 2017-12-05 39 90d 2017-10-16 +12d
Scram # 52625 Manual
2017-03-21 2017-07-30 132 143d - -
Unscheduled
2016-10-23 2016-10-29 7 - - -
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