Fuel Burn Down Cycle since May 4, 2026
NukeWorker's Operational Excellence Score 5-yr composite · ranks 43 of 94 ↓3
Operational
Excellence Score
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).
Per-dimension breakdown (7 metrics)
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.
Capacity Factor (365-Day)
Breaker-to-Breaker Runs 9 runs
| 2023-05-21 | 2024-10-13 | 511 days |
| 2021-11-20 | 2023-04-09 | 505 days |
| 2018-11-14 | 2020-04-12 | 515 days |
| 2014-05-24 | 2015-09-26 | 490 days |
| 2011-04-11 | 2012-09-24 | 532 days |
| 2009-11-27 | 2011-03-07 | 465 days |
| 2006-11-13 | 2008-04-14 | 518 days |
| 2003-10-16 | 2005-04-04 | 536 days |
| 2002-02-28 | 2003-09-13 | 562 days |
Scram History 6 events since 2011
Outage Duration Trend
?Power History (12-Month)
?Outage Days by Year
?Facility Statistics
NukeWorker Member Ratings 3 votes
Facility Map
40.623, -80.432
