?
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
ranked of 93
Subscribers
?
Current reactor power level from the most recent NRC daily report.
100%
Power
ONLINE
?
Days of continuous operation since the last outage ended. Ranked against all operating units.
145
Current Run
days
#61 of 95
Mid Quartile
?
Longest recorded period of continuous operation between outages.
569
Record Run
days
#54 of 95
Mid Quartile
?
Breaker-to-Breaker runs — continuous operation exceeding the cycle-adjusted threshold (444 days for this 18-month cycle unit) with no trips to 0% power.
6
B2B Runs
#29 of 87
Mid Quartile
?
Lifetime capacity factor: average power level across all recorded days (100% = always at full power). Ranked against all NRC-tracked units.
87.8%
Capacity Factor
#75 of 95
Bottom Quartile
?
Net electricity actually generated over the most recent 12 months reported by the U.S. Energy Information Administration (Form EIA-923), summed across every unit at this plant. These are authoritative actuals, not an estimate.
14.07 TWh
Net Generation
EIA-923 · 12 mo to 2026-06 · plant total
?
Community rating score (Bayesian-adjusted). Based on 55 votes. Ranked against all rated facilities.
63.1
Rating
55 votes
#9 of 97
Top Quartile
?
Total NRC-reported scram events (emergency reactor shutdowns). Ranked fleet-wide — fewer scrams = better rank.
7
Scrams
#53 of 94
Mid Quartile
?
Years since commercial operation began. License remaining: 11.8 years.
46.5
Operating Age
years
11.8 yrs remaining
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.OnlineReduced PowerCoastdownPower AscensionRefueling Outage
Estimated reactivity remaining in Arkansas Nuclear 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 1, 2026
Arkansas Nuclear 2 is 143 days into its current fuel cycle with an estimated 71.8% of its fuel left. Its typical cycle runs about 500 days.
Fresh — 100%
Refuel — 0%
71.8% remaining
Fresh fuel
Cycle progress
143 / 500 days
EFPD remaining
359 days
Effective burn
141 EFPD
Burn deficit
2.2 FPD
Arkansas Nuclear 2 is early in its fuel cycle with 359 EFPD of reactivity remaining. Refuel is not expected for many months.
Historical Burn-Down (18 completed cycles)
Avg refuel point
3.9% remaining
Avg refuel (3yr)
1.8% remaining
Deepest burn
0.0% (1999-02 → 2000-09)
Most margin
18.3% (2018-11 → 2020-03)
Last 5 cycles at refuel
18%
2018-11
0%
2020-04
1%
2021-11
2%
2023-05
1%
2024-10
~5% coastdown (this unit)
Operational Excellence Score Subscribers
Arkansas Nuclear 2 is rated 0 to 100 on how well it actually runs, scored against every other operating reactor in the US fleet from its own operating record. Subscribers see the score, the three sub-scores behind it, and each of the seven measured inputs.
- This unit's composite score and fleet rank
- Reliability, Efficiency and Discipline sub-scores
- All seven measured inputs, with fleet percentiles
- Rank against comparable units, not just the fleet
- Three-year, five-year and lifetime windows
- Five-year trend, and every other operating US reactor
Included with every outage subscription and with NukeWorker Gold membership. Trading the outage rather than working it? The same record, cut by power market, is on NukeGryd.
Capacity Factor (365-Day)
100%
Current
85.4%
365-Day Avg
#64
of 94 plants
Min: 0%
Max: 100%
54 days <80%
B2B CHAMPION
2,107 days without a trip
·
6 Career Runs · 3 since last trip
Champion since Feb 15, 2023
Breaker-to-Breaker Runs 6 runs
Breaker-to-breaker runs measure continuous operation between refueling outages using a cycle-adjusted threshold (90% of cycle length minus RFO duration). An active streak means the unit has been running continuously since the last refueling with no trips to 0% power.
Arkansas Nuclear 2 has logged 6 breaker-to-breaker runs, continuous stretches from one refueling to the next with no trip to zero power. Its longest ran 527 days, and its runs average 500 days.
527
Best Run (days)
2R17 (2005-04-11) → 2R18 (2006-09-20)
500
Avg Run (days)
★ Triple breaker-to-breaker
2R28 → 2R29 → 2R30 → 2R31
All Runs
| 2024-10-29 | 2026-03-14 | 501 days | 2R30 → 2R31 |
| 2023-05-23 | 2024-09-28 | 494 days | 2R29 → 2R30 |
| 2021-11-28 | 2023-04-15 | 503 days | 2R28 → 2R29 |
| 2014-06-12 | 2015-09-21 | 466 days | 2R23 → 2R24 |
| 2005-04-11 | 2006-09-20 | 527 days | 2R17 → 2R18 |
| 2002-05-05 | 2003-09-24 | 507 days | 2R15 → 2R16 |
Scram History 7 events since 2011
Automatic and manual reactor scram (emergency shutdown) events reported to the NRC since 2011. Includes event dates, trip type, and average recovery time. Click the title to view the full fleet scram dashboard.
Arkansas Nuclear 2 has recorded 7 reactor scrams, or emergency shutdowns, since 2011 (7 automatic, 0 manual). On average the unit was back to full power about 20.8 days after each trip.
Outage Duration Trend
?Scheduled refueling outage durations over time. Green bars are below average, yellow near average, red above. Dashed line shows the plant's historical average. Shorter outages mean better execution.
Arkansas Nuclear 2 has completed 19 scheduled refueling outages on record, averaging 44 days each. The most recent, in Mar 2026, ran 48 days.
Power History (12-Month)
?Daily power output as a percentage of rated capacity over the past 365 days. Green segments indicate full power (90%+), yellow shows reduced output, and red indicates significant power reductions or shutdowns.
Over the past 12 months Arkansas Nuclear 2 has run at an average of 85.4% of rated power. On the chart, green stretches are full-power running and dips toward zero mark reduced output or outages.
Outage Days by Year
?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, Arkansas Nuclear 2 has spent 838 days in scheduled refueling outages and 252 days in forced or unplanned outages. Taller bars mark the years with the most downtime.
Facility Statistics
Key performance and lifecycle metrics calculated from NRC operational data. Includes operating age, construction timeline, capacity factor, efficiency, generation totals, and reliability records.
Arkansas Nuclear 2 has operated for about 46.5 years and averaged a 87.8% lifetime capacity factor, generating roughly 212.3 TWh of electricity. Its longest unbroken run reached 569 days.
Lifecycle & Tenure
Operating Age: 46.5 Yrs
Build Time: 7.3 Yrs
Lic. Remaining: 11.8 Yrs
Production & Power
Lifetime CF: 87.8%
Efficiency: 32.6%
Generated: 212.3 TWh
Reliability & Outages
Record Run: 569 Days
Refuelings: 19
Avg Startup: 4.5 Days
NukeWorker Member Ratings 55 votes
Community ratings from NukeWorker members. Vote to share your experience working at this facility. Score uses a Bayesian average that accounts for vote count — facilities with few votes are pulled toward the fleet average, so rankings reflect confidence, not just raw percentages.
Above Average
28 (50%)
Average
21 (38%)
Below Average
6 (10%)
Facility Map
Interactive satellite map showing the facility's geographic location. Marker color indicates current status: green for online, red for offline, orange for reduced power. Click the header to open in Google Maps satellite view.
35.3097, -93.2343
Location & Contact
Physical address, phone number, and website for this facility. Use the directions link to get driving directions via Google Maps.
Phone:
(501) 858-5000
Website:
http://www.entergy-nuclear.com/
Per Diem Rates FY 2026
Per diem covers lodging and meals & incidental expenses (M&IE) for government and contractor travel near this facility. Rates are from GSA for FY 2026.
$110
Lodging/Night
$68
M&IE/Day
$178
Total/Day
Standard Rate, AR
Unemployment Benefits AR
Maximum state unemployment insurance benefits for AR. Actual benefits depend on your earnings history and may be lower than the maximum. Data as of Jan 2026.
$451
Max Weekly
12
Max Weeks
$5,412
Max Total
7-day waiting period before benefits begin
Photos
Photos of this facility from the NukeWorker photo gallery. Click the header or any photo to browse the full album.
Ownership & Construction
The utility or company that owns and operates the facility, the architect-engineer responsible for plant design, and the primary construction contractor. Click names to view all facilities by that entity on the map.
ETR
Entergy Corporation
NYSE
$101.58
▼ -0.43 (-0.42%)
Previous Close
102.01
Day's Range
101.21 – 102.17
52-Week Range
88.90 – 118.45
Volume
2,758,806
Delayed quote as of Sep 21, 2026 4:00 PM ET.
Source: Yahoo Finance.
Full quote on Yahoo Finance
Technical Specs
Reactor design specifications including type (PWR/BWR), containment design, nuclear steam supply system manufacturer, thermal and electrical power ratings, and current operational status.
Reactor Type:
PWR
Containment:
PWR-DRYAMB
NSS Supplier:
COMB CE
Thermal Power:
3026 MWt
Net Capacity:
985 MWe
Efficiency:
32.6%
Status:
Operating
Licensing
NRC licensing history including docket number, license type and number, construction permit date, operating license issuance, commercial operation date, license renewal, and expiration date.
Docket #:
05000368
License #:
NPF-6
License Type:
OL-FP
Const. Permit:
1972-12-06
Operating Lic:
1978-09-01
Commercial Op:
1980-03-26
License Renewed:
2005-06-30
License Exp:
2038-07-17
Market & Region
EIA market and grid-region classifications: NERC reliability region, U.S. Census region, balancing authority responsible for grid operations, and whether the unit operates as a rate-regulated utility or a competitive merchant generator. Hover any value for the full name.
NERC Region:
SERC
— SERC Reliability Corporation
Census Region:
WSC
— West South Central
Balancing Authority:
MISO
— Midcontinent Independent System Operator (ISO/RTO)
Market Structure:
Regulated
— Rate-regulated utility (cost-of-service pricing)