?
Total qualified breaker-to-breaker runs — continuous operation exceeding each unit's cycle-adjusted threshold with no trips to 0% power. Threshold = 90% of (cycle length minus RFO duration).
-
Total B2B Runs
?
Average duration of continuous operation across all qualifying breaker-to-breaker runs. When a plant is selected, shows quartile rank vs fleet.
-
Avg Duration
?
The longest single breaker-to-breaker run on record in the fleet. The US record is over 700 days.
-
Longest Run
?
Nuclear units currently on a qualifying B2B run — exceeding their cycle-adjusted threshold and still operating with no trips to 0% power.
-
Active Runs
?
B2B runs completed in the last two years, indicating recent fleet breaker-to-breaker performance.
-
Recent (2yr)
?
The unit with the longest ongoing breaker-to-breaker run — the current industry leader.
-
Best Active Streak
NukeWorker's registry holds 503 verified breaker-to-breaker runs since 1999. A run is a stretch where a reactor goes from one refueling straight through to the next with no unplanned shutdown. Runs average 553 days, the longest reached 753 days, and 4 units are on an active run right now.
BEST ACTIVE STREAK
—
SHORTEST COMPLETED
—
?
Units that have banked a qualifying B2B run and have not tripped since. A champion holds the title through planned refuels and loses it only on a scram or forced outage. Respects the filters above.
B2B Champions
| Unit | Owner | Days Since Trip | Career Runs | Runs Since Trip | Champion Since |
|---|
33 units currently hold B2B champion status, meaning they have banked a qualifying run and have not tripped since. The leader, Braidwood 2, has gone 4,754 days without a trip.
?
Annual count of completed breaker-to-breaker runs vs total refueling outages, showing the fleet's B2B success rate over time.
B2B Runs & Success Rate
Across the record the fleet has completed 499 breaker-to-breaker runs against 1,578 refueling outages, about a 32% success rate.
?
Nuclear plants ranked by total number of breaker-to-breaker runs completed.
Top Plants by B2B Runs
?
Utility companies ranked by average B2B run duration (days). Longer = better operational continuity.
Owner Leaderboard — Avg B2B Duration
?
Each dot is a completed B2B run plotted by end date and duration. The trend line shows whether the industry is achieving longer runs over time.
Fleet Trend — B2B Duration Over Time
B2B runs have gotten longer: completed runs averaged about 526 days in the early years and 564 days recently.
?
Does a shorter preceding outage lead to a longer B2B run? Each dot shows the outage that preceded a B2B run vs the run duration.
Outage Duration vs B2B Run Length
?
Year-by-year breakdown: B2B runs completed divided by total refueling outages started that year.
Industry Performance: B2B Success Rate
| Year | B2B Runs | Total Refuels | Success Rate |
|---|
* B2B Runs: Count of breaker-to-breaker runs completed in that year.
* Total Refuels: Count of verified Scheduled Refueling Outages starting in that year.
* Success Rate: B2B Runs / Total Refueling Outages.
?
Searchable registry of all verified breaker-to-breaker runs. Sortable by unit, owner, start/end date, and duration in days. Export to CSV, Excel, or JSON.
B2B Registry
This registry lists all 503 verified B2B runs from 1999 to today. Sort by unit, owner, dates, or length, or export the full set.
| Unit | Owner | Start | End | Days | Status |
|---|
Methodology: Continuous operation > 470 days (approx 15 months) with NO trips (0% power).
Matches standard 18/24 month fuel cycles. Short runs ending in forced outages are excluded.
Page created in 0.004 seconds with 1 queries (cached).