Peach Bottom 2 - Status & History

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

Plant Info Outage History Daily Power Log
?
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.
66
Excellence
#23 of 94 →
Top Quartile
?
Days of continuous operation since the last outage ended. Clean run (no forced outages since last refueling).
555
Current Run
days ✔
?
Longest recorded period of continuous operation between outages (2012-10-17 to 2014-10-20).
733
Record Run
days
?
Breaker-to-Breaker runs — continuous operation exceeding the cycle-adjusted threshold (627 days for this 24-month cycle unit) with no trips to 0% power.
6
B2B Runs
87% toward B2B (547/627d)
?
Lifetime capacity factor: average power level across all recorded days (100% = always at full power).
94.3%
Capacity Factor
?
Total number of scheduled refueling outages detected in the historical data.
13
Outages
since 1999
?
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.
2.3
Avg Startup
days (last 3)
?
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.
95.8%
Fuel Utilization
lifetime avg
?
NukeWorker's Operational Excellence Score is a composite 0–100 ranking of every active US nuclear unit across 7 publicly observable 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
NukeWorker's
Operational
Excellence Score
66/100
Top Quartile · #23/94
5-year window

Peach Bottom 2 ranks #23 of 94 active US units on NukeWorker's Operational Excellence Score over the 5-year window. Strongest area: Refuel Duration (100th percentile). Weakest: Scrams (5-year) (16th percentile).

Reliability
89
Capacity factor + Forced outages + B2B streaks
Efficiency
67
Fuel utilization + Refuel duration
Discipline
41
Startup duration + Scram count
Cohort Rankings apples-to-apples comparison within each peer group
Reactor type: #10 of 31 BWR
Containment: #6 of 19 Mark I (BWR)
Cycle length: #13 of 40 24-month cycle
Fleet rank above (23 of 94) compares all active US units; cohort ranks compare only against units sharing this property.
Per-dimension breakdown (7 metrics)
Capacity Factor 99th
97.2% (higher better, Reliability)
Forced Outage Days/yr 72th
2.0d (lower better, Reliability)
B2B Avg Streak 96th
710d (higher better, Reliability)
Fuel Utilization 34th
97.3% (higher better, Efficiency)
Refuel Duration 100th
15d (lower better, Efficiency)
Startup Duration 67th
3.8d (lower better, Discipline)
Scrams (5-year) 16th
0.8/yr (lower better, Discipline)

Each dimension's percentile is computed across the active US fleet (94 units with sufficient history). Sub-score = average of its component percentiles. Composite = average of the three sub-scores. 5-year window. View full leaderboard →

Methodology

NukeWorker's Operational Excellence Score is a composite ranking that combines 7 publicly observable performance metrics into a single 0-100 number per US nuclear unit.

How it's computed: Each unit's raw value is converted to a percentile (0-100) within the 94 active US units that have at least 2 completed refueling cycles. The 7 percentiles are averaged into 3 sub-scores (Reliability, Efficiency, Discipline), and those are averaged into the final composite.

Active window — 5-year:

  • Reliability — Capacity factor (5yr), forced outage days/yr (5yr), B2B avg streak (lifetime)
  • Efficiency — in-cycle fuel utilization (3yr), median refuel duration (5yr)
  • Discipline — robust mean startup duration, scrams/yr (5yr, annualised)

Cohort rankings: alongside the fleet rank, each unit gets ranked within its reactor type (PWR/BWR), containment design (Ice Condenser, Mark I, etc.), and cycle length (12/18/24-month). Useful for apples-to-apples comparisons.

What's excluded: subjective community ratings, confidential INPO ratings, financial metrics. We only use publicly available NRC + cycle data.

Why three windows? 5yr (default) is the industry standard. 3yr captures recent operational changes and post-pandemic recovery. Lifetime gives newer units a fair comparison and reveals long-term consistency.

Edge cases: units with fewer than 2 cycles (e.g., Vogtle 4) show "Provisional". Decommissioned units excluded.

Refresh cadence: recomputed daily. Each window cached separately.

A data-derived proxy for operational performance; not affiliated with INPO. INPO ratings are confidential and qualitative — ours is public and quantitative.

5-yr trend: 2021: 77/100 (#12/93)2022: 68/100 (#22/92)2023: 69/100 (#21/92)2024: 56/100 (#34/93)2025: 67/100 (#24/94)2026: 68/100 (#22/94) Stable vs 2025
Compare Peach Bottom 2 head-to-head with up to 3 other units. Compare now
?
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

?
Days between consecutive scheduled refueling outage starts, showing operating cycle regularity. The purple dashed line marks the average cycle length. Most U.S. reactors operate on 18-month (547 day) or 24-month (730 day) cycles.

Cycle Length History

?
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

?
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 6, 2024

23.2% remaining 553 / 718 days 1.5 FPD margin
Avg refuel: 4.2% Deepest burn: 0.0% (2012-10 → 2014-10) Most margin: 7.9% (2014-12 → 2016-10)
?
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

Type ⇅ Actual Start ⇅ Actual End ⇅ Duration ⇅ Days Online ⇅ Scheduled Delta
Scheduled
2024-10-21 2024-11-05 16 102d 2024-10-21 0d
Scram # 57221
2024-07-11 2024-07-11 1 3d - -
Unscheduled
2024-07-06 2024-07-08 3 158d - -
Scram # 56936
2024-01-30 2024-01-30 1 458d - -
Scheduled
2022-10-17 2022-10-29 13 152d 2022-10-17 0d
Scram # 55899
2022-05-17 2022-05-18 2 183d - -
Scram # 55575
2021-11-15 2021-11-15 1 365d - -
Scheduled
2020-10-19 2020-11-15 28 722d 2020-10-19 0d
Scheduled
2018-10-15 2018-10-28 14 703d 2018-10-15 0d
Scheduled
2016-10-24 2016-11-11 19 313d 2016-10-24 0d
Unscheduled
2015-12-15 2015-12-16 2 380d - -
Scheduled
2014-10-20 2014-11-30 42 733d 2014-10-19 +1d
Scheduled
2012-09-10 2012-10-17 38 705d 2012-09-10 0d
Scheduled
2010-09-13 2010-10-06 24 695d 2010-09-12 +1d
Scheduled
2008-09-15 2008-10-18 34 707d 2008-09-15 0d
Scheduled
2006-09-16 2006-10-09 24 370d 2006-09-15 +1d
Unscheduled
2005-09-09 2005-09-11 3 61d - -
Unscheduled
2005-07-10 2005-07-10 1 156d - -
Unscheduled
2005-02-03 2005-02-04 2 41d - -
Unscheduled
2004-12-23 2004-12-24 2 77d - -
Scheduled
2004-09-15 2004-10-07 23 203d 2004-09-14 +1d
Unscheduled
2004-02-22 2004-02-25 4 154d - -
Unscheduled
2003-09-15 2003-09-21 7 52d - -
Unscheduled
2003-07-23 2003-07-25 3 101d - -
Unscheduled
2003-04-13 2003-04-13 1 111d - -
Unscheduled
2002-12-22 2002-12-23 2 81d - -
Scheduled
2002-09-11 2002-10-02 22 319d 2002-09-11 0d
Unscheduled
2001-10-24 2001-10-27 4 113d - -
Unscheduled
2001-07-01 2001-07-03 3 250d - -
Unscheduled
2000-10-24 2000-10-24 1 20d - -
Scheduled
2000-09-16 2000-10-04 19 119d 2000-09-16 0d
Unscheduled
2000-05-20 2000-05-20 1 229d - -
Unscheduled
1999-10-01 1999-10-04 4 - - -
Page created in 0.101 seconds with 7 queries.