Detected events

Hartlepool, Reactor 2: unscheduled power reduction to 240 MW (39% of 620 MW) · operational reasons

Elexon BMRS REMIT, message 48X000000000022A-ELXP-RMT-00148199 rev. 6 (Active), published September 1, 2026, at 21:35 UTC. BM Unit T_HRTL-2, participant BEGL001. Unplanned · Operational: "52398: De-load for operational reasons". Window 2026-07-14 04:00 UTC → 2026-09-14 02:00 UTC. Normal capacity 620 MW, available 380 MW.

The Dow Chemical Company: The following information was provided by the Texas Department of State Health Services (the Agency) via phone and email:

EN Revision Imported Date: 8/20/2026 EN Revision Text: AGREEMENT STATE REPORT - STUCK SHUTTER The following information was provided by the Texas Department of State Health Services (the Agency) via phone and email: "On July 15, 2026, the Agency received a notification from the licensee regarding a stuck source shutter on a density gauge. The gauge, a Vega SHF2 Model, contains a 200 millicurie cesium-137 sealed sourc…

Fermi 2 increased its power output from 8% to 41%

Cooper increased its power output from 80% to 100%

Fermi 2 returned to service (0% → 8%)

Chooz: power reduction

EDF, July 11, 2026: “Adjustment of production at the Chooz nuclear power plant due to weather conditions...”.

Blayais 4: Scheduled Shutdown

EDF, July 11, 2026: “Unit 4 shut down for scheduled maintenance.” Tags: Operations.

Cooper reduced output from 100% to 80%

Representatives of CGNPC-URC and Yangjiang Nuclear Power Plant Visit Ulba-FA Plant

Kazatomprom · Media

Blayais: power reduction

EDF, July 7, 2026: “Adjustment of production at the Blayais plant due to weather conditions.” Tags: Operations.

The CNEA hosted a visit from the IAEA Deputy Director General

CNEA · News · He toured facilities at the Ezeiza and Bariloche nuclear centers, the Argentine Proton Therapy Center, the Atucha Nuclear Complex, and the companies CONUAR and INVAP. He also held meetings with...

Urenco USA Congratulates Advanced Reactor Companies on Achieving Initial Criticality

Urenco · News

Fermi 2 was taken offline (83% → 0%)

Vogtle 1 increased its power output from 75% to 100%

Vogtle 3 increased its power output from 55% to 100%

Los Angeles General Medical Center: The following information was provided by the California Radiation Control Program via email:

EN Revision Imported Date: 8/13/2026 EN Revision Text: AGREEMENT STATE REPORT - MEDICAL EVENT The following information was provided by the California Radiation Control Program via email: "On July 8, 2026, at 1141 PDT, the certified nuclear medicine technologist (CNMT) and the assistant radiation safety officer (ARSO) at Los Angeles General Medical Center notified the principal radiation protection specialist at Los …

The Techs Industries: AGREEMENT STATE REPORT - STUCK SHUTTERS

AGREEMENT STATE REPORT - STUCK SHUTTERS The following information was provided by the Pennsylvania Bureau of Radiation Protection (the Department) via email: "On July 1, 2026, at 1000 [EDT], the licensee's safety representative and a contracted technical specialist from Applied Health Physics, LLC notified the radiation safety officer (RSO) that the coating weight gauges' shutter mechanisms were malfunction…

Vogtle 1 reduced output from 100% to 55%

Vogtle 3 reduced output from 100% to 55%

Costco: AGREEMENT STATE REPORT - LOST EXIT SIGN

AGREEMENT STATE REPORT - LOST EXIT SIGN The following is a summary of information provided by the Colorado Department of Public Health and Environment via email: The licensee reported that one exit sign, containing 9.21 Ci of tritium, was lost in Westminster, Colorado. Manufacturer: SRB Technologies Model number: BX-10-GY Colorado event number: CO260014 THIS MATERIAL EVENT CONTAINS A 'Less than Cat 3' LEVE…

Rocky Mountain Bottle Company: AGREEMENT STATE REPORT - LOST EXIT SIGNS

AGREEMENT STATE REPORT - LOST EXIT SIGNS The following information was provided by the Colorado Department of Public Health and Environment via email: Four tritium exit signs were declared lost by the licensee on June 30, 2026. The exit signs are Safety Light Corporation model 2040, containing 9.25 Ci of tritium each. Colorado Event Number: CO260018 THIS MATERIAL EVENT CONTAINS A 'Less than Cat 3' LEVEL OF …

Cooper increased its output from 65% to 100%

South Texas 2 increased its output from 72% to 100%

Grand Gulf 1 increased its output from 78% to 100%

South Texas 2 returned to service (0% → 72%)

Grand Gulf 1 reduced its power output from 100% to 78%

Susquehanna 2 increased its power output from 79% to 100%

Chooz 1: reconnection to the power grid

EDF, June 26, 2026: “Reconnection of Power Unit No. 1 and projected reduction in its output due to...”. Tags: Operations, Environmental Event.

Nextier Completion Solutions: The following information was provided by the Texas Department of State Health Services (the Agency) via phone and email:

EN Revision Imported Date: 8/20/2026 EN Revision Text: AGREEMENT STATE REPORT - STUCK SHUTTER The following information was provided by the Texas Department of State Health Services (the Agency) via phone and email: "On June 26, 2026, the licensee reported that while attempting to close the shutter on a Berthold densitometer, their electronic technician had the shutter handle come off the device into his hand. The sh…

Evento INES 2 · Topspeed Couriers Ltd (Reino Unido): Misdelivered Transport Package

Topspeed Couriers Ltd was carrying a Type A package containing radioactive material in the form of a 555 GBq special form Selenium-75 source intended for industrial radiography. The package was delivered to the wrong location in Aberdeen. Later after one hour the organisation which had incorrectly received the package delivered it to the correct consignee. However, the package was not correctly handled by the correct…

Cooper reduced power output from 100% to 65%

Civaux 2: reconnection to the power grid

EDF, June 24, 2026: “Generating Unit No. 2 Reconnected to the National Power Grid.” Tags: Production.

Perry 1 increased its output from 66% to 95%

Clinton reduced output from 99% to 74%

Chooz 1: reconnection to the power grid

EDF, June 20, 2026: “Noise disturbances during the restart operations of Power Unit No. 1.”

Perry 1 reduced output from 100% to 55%

South Texas 2 went offline (100% → 0%)

Catawba: PART 21 - NON COMPLIANT ELECTROMECHANICAL RELAYS

PART 21 - NON COMPLIANT ELECTROMECHANICAL RELAYS The following is a summary of information was provided by ABB Inc. via email: On July 17, 2026, during calibration of a KF relay, ABB identified a deviation from the specified coil-assembly drying process. The affected coil assembly had completed the required air-drying stage, however, the subsequent force-drying (baking) stage had not been performed. The applicable pr…

Heysham 2, Reactor 7: unscheduled outage, 660 MW unavailable · maintenance

Elexon BMRS REMIT, message 48X000000000022A-ELXP-RMT-00148191 rev. 50 (Active), published September 1, 2026, at 14:05 UTC. BM Unit T_HEYM27, participant BEGL001. Unplanned · Maintenance: "52340: De-load for maintenance activities". Window 2026-06-16 23:00 UTC → 2026-09-02 12:30 UTC. Normal capacity 660 MW, available 0 MW.

Millstone 2 increased its power output from 13% to 100%

Millstone 2 returned to service (0% → 13%)

Brunswick 1 increased its output from 65% to 95%

River Bend Unit 1 increased its output from 73% to 100%

Saint Lucie 2 increased its power output from 56% to 95%

Brunswick 1 reduced its output from 100% to 65%

River Bend Unit 1 reduced its output from 100% to 73%

Chooz 1: Unit Shutdown

EDF, June 12, 2026: “Shutdown of Generation Unit No. 1 at the Chooz Power Plant.” Tags: Operations.

Arkansas Nuclear 2 increased its power output from 60% to 90%

FitzPatrick increased its power output from 50% to 100%

FitzPatrick reduced output from 100% to 50%

Surry 2 increased its power output from 57% to 88%

Surry 2 increased its output from 30% to 57%

Arkansas Nuclear 2 reduced its power output from 77% to 55%

Surry 2 increased its output by 5% → 30%

Columbia Generating Station U2: INVALID SPECIFIED SYSTEM ACTUATION

INVALID SPECIFIED SYSTEM ACTUATION The following information was provided by the licensee via phone and email: "On June 8, 2026, at 1259 PDT, Columbia Generating Station's leak detection monitor '1A' (LD-MON-1A) caused an isolation of RWCU-V-4 (reactor water cleanup outboard isolation valve) and RCIC-V-8 (reactor core isolation cooling outboard steam supply isolation valve). "Based on a review of avai…

Susquehanna U1: INVALID SPECIFIED SYSTEM ACTUATION

INVALID SPECIFIED SYSTEM ACTUATION The following information was provided by the licensee via phone and email: "This 60-day telephone notification is being made in accordance with the reporting requirements specified by 10 CFR 50.73(a)(1) and 10 CFR 50.73(a)(2)(iv)(A) for the invalid actuation of an emergency diesel generator (EDG). "On June 8, 2026, at approximately 0815 EDT, during prerequisite activities for syste…

Arkansas Nuclear 2 reduced its power output from 100% to 77%

Surry 2 returned to service (0% → 5%)

Chinon 1: Unit Shutdown

EDF, June 7, 2026: “Update on Production Unit No. 1.” Tags: Production. Published on 07/07/2026 On Sunday, June 7, around 12:00 p.m., crews at the Chinon Nuclear Power Plant shut down Power Unit No. 1. The purpose of this short-term shutdown is to perform work on a valve in the machine room.

Browns Ferry 3 increased its output from 78% to 100%

Blayais 1: scheduled shutdown

EDF, June 6, 2026: “Update on Generation Unit No. 1.” Tags: Production. On Saturday, June 6, at 3:15 a.m., crews at the Blayais power plant shut down Generation Unit No. 1. This short-term shutdown allows EDF to adjust its electricity production to meet demand. Generating Units 3 and 4 are connected to the national power grid. Generating Unit 2 is currently shut down for scheduled maintenance (partial inspection).

Browns Ferry 3 reduced its output from 100% to 78%

Millstone 2 was taken out of service (95% → 0%)

Saint Lucie 2 returned to service (0% → 30%)

Chooz 2: Reconnection to the power grid

EDF, June 4, 2026: “Reconnection of Generation Unit No. 2 at the Chooz Power Plant.” Tags: Plant Operations, Production, Safety, Maintenance.

Millstone 2 increased its power output from 65% to 95%

Clinton increased power output from 80% to 100%

Dresden 3 increased its power output from 71% to 100%

Hatch 1 increased its power output from 68% to 100%

LaSalle 1 increased its power output from 11% to 100%

Browns Ferry 2 increased its power output from 70% to 100%

Clinton reduced power output from 100% to 80%

Comanche Peak 2 increased its output from 48% to 99%

Cooper increased its output from 70% to 100%

Dresden 3 reduced its power output from 100% to 71%

Hatch 1 reduced output from 100% to 68%

LaSalle 1 returned to service (0% → 11%)

Oconee 3 increased its power output from 73% to 100%

Browns Ferry 2 reduced its power output from 100% to 70%

Comanche Peak 2 increased its output from 6% to 48%