Beaver Valley 2 - Status & History

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

Plant Info Outage History Daily Power Log
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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.
51
Excellence
#43 of 94 ↓3
Mid Quartile
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Days of continuous operation since the last outage ended. Clean run (no forced outages since last refueling).
11
Current Run
days ✔
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Longest recorded period of continuous operation between outages (2002-02-27 to 2003-09-13).
563
Record Run
days
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Breaker-to-Breaker runs — continuous operation exceeding the cycle-adjusted threshold (457 days for this 18-month cycle 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).
91.7%
Capacity Factor
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Total number of scheduled refueling outages detected in the historical data.
19
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.
4
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
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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
51/100
Mid Quartile · #43/94
5-year window

Beaver Valley 2 ranks #43 of 94 active US units on NukeWorker's Operational Excellence Score over the 5-year window. Strongest area: Fuel Utilization (80th percentile). Weakest: Scrams (5-year) (16th percentile).

Reliability
53
Capacity factor + Forced outages + B2B streaks
Efficiency
67
Fuel utilization + Refuel duration
Discipline
33
Startup duration + Scram count
Cohort Rankings apples-to-apples comparison within each peer group
Reactor type: #30 of 61 PWR
Containment: #25 of 48 Dry Ambient (PWR)
Cycle length: #24 of 54 18-month cycle
Fleet rank above (43 of 94) compares all active US units; cohort ranks compare only against units sharing this property.
Per-dimension breakdown (7 metrics)
Capacity Factor 41th
90.1% (higher better, Reliability)
Forced Outage Days/yr 68th
2.2d (lower better, Reliability)
B2B Avg Streak 49th
515d (higher better, Reliability)
Fuel Utilization 80th
98.7% (higher better, Efficiency)
Refuel Duration 53th
32d (lower better, Efficiency)
Startup Duration 49th
4.3d (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: 48/100 (#54/93)2022: 54/100 (#44/92)2023: 43/100 (#57/92)2024: 46/100 (#54/93)2025: 44/100 (#60/94)2026: 41/100 (#63/94) ↓ -2.9 pts vs 2025
Compare Beaver Valley 2 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

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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

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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

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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 4, 2026

98.5% remaining 9 / 509 days 1.2 FPD margin
Avg refuel: 2.1% Avg refuel (3yr): 1.4% Deepest burn: 0.0% (2002-02 → 2003-09) Most margin: 12.9% (2000-10 → 2002-02)
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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

Type ⇅ Actual Start ⇅ Actual End ⇅ Duration ⇅ Days Online ⇅ Scheduled Delta
Scheduled
2026-04-05 2026-05-03 29 421d 2026-04-11 -6d
Scram # 57535
2025-02-06 2025-02-08 3 85d - -
Scheduled
2024-10-13 2024-11-13 32 512d 2024-10-13 0d
Scheduled
2023-04-09 2023-05-20 42 506d 2023-04-09 0d
Scram # 55586
2021-11-18 2021-11-19 2 7d - -
Scheduled
2021-10-10 2021-11-11 33 3d 2021-10-12 -2d
Scram # 55507
2021-10-06 2021-10-07 2 518d - -
Scheduled
2020-04-12 2020-05-06 25 516d 2020-04-13 -1d
Scheduled
2018-10-21 2018-11-13 24 67d 2018-10-20 +1d
Unscheduled
2018-08-13 2018-08-15 3 450d - -
Scheduled
2017-04-22 2017-05-20 29 436d 2017-04-16 +6d
Unscheduled
2016-02-04 2016-02-11 8 98d - -
Scheduled
2015-09-26 2015-10-29 34 491d 2015-09-28 -2d
Scram # 50124
2014-05-21 2014-05-23 3 2d - -
Scheduled
2014-04-19 2014-05-19 31 314d 2014-04-14 +5d
Unscheduled
2013-05-28 2013-06-09 13 208d - -
Scheduled
2012-09-24 2012-11-01 39 533d 2012-09-24 0d
Scheduled
2011-03-07 2011-04-10 35 466d 2011-03-07 0d
Scheduled
2009-10-12 2009-11-26 46 350d 2009-10-12 0d
Unscheduled
2008-10-25 2008-10-27 3 156d - -
Scheduled
2008-04-14 2008-05-22 39 519d 2008-04-16 -2d
Scheduled
2006-10-02 2006-11-12 42 180d 2006-10-01 +1d
Unscheduled
2006-04-03 2006-04-05 3 340d - -
Scheduled
2005-04-04 2005-04-28 25 537d 2005-04-03 +1d
Unscheduled
2003-10-15 2003-10-15 1 4d - -
Scheduled
2003-09-13 2003-10-11 29 563d 2003-09-13 0d
Scheduled
2002-02-04 2002-02-27 24 322d 2002-02-04 0d
Unscheduled
2001-03-18 2001-03-19 2 89d - -
Unscheduled
2000-12-12 2000-12-19 8 48d - -
Scheduled
2000-09-23 2000-10-25 33 325d 2000-09-23 0d
Unscheduled
1999-10-23 1999-11-03 12 88d - -
Unscheduled
1999-07-18 1999-07-27 10 99d - -
Scheduled
1999-02-27 1999-04-10 43 - 1999-02-27 0d
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