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Market Intelligence · October 2026
Nuclear Market Update: October 2026
Seven U.S. developments that shape demand for nuclear-grade HEPA and iodine adsorber filtration, from a new NRC licensing rule to six AP1000s proposed in Kentucky, with what each one means for facility operators.
Updated October 26, 2026Iodine Air Systems6 min read
Quick answer
The headline this month is regulatory: on October 22, 2026 the NRC finalized a rule that lets reactor applicants reuse DOE and Department of War demonstration data, giving this summer's five pilot reactors a faster road to commercial licences. In the same week, The Nuclear Company proposed up to six AP1000s (6.6 GW) in Kentucky and the Navy picked Radiant's Kaleidos microreactor for Naval Weapons Station Crane. Meanwhile, Vermont Yankee decommissioning is about 99% done.
USA · Regulation
1. NRC finalizes rule letting applicants reuse DOE and DOW demonstration data
The NRC finalized a rule that lets commercial reactor applicants use analyses, test data and other information from Department of Energy or Department of War reactor demonstration programs. It amends 10 CFR Parts 50 and 53 and takes effect 30 days after Federal Register publication. Applicants must still meet every NRC requirement and identify differences in design, site or hazards between the demonstration reactor and the commercial project. It is the first major reactor rule finalized under Executive Order 14300; the NRC received 136 unique comment submissions on the April 2 proposal.
What it means for filtration: Pilot-program reactors now have a faster road to commercial licences. The ventilation and filtration data recorded during demonstration (HEPA in-place tests, carbon adsorber test results, exhaust monitoring) becomes part of the licensing record, so test reports and traceable filter documentation matter from day one.
2. Prosperity One: up to six AP1000s proposed in Lewis County, Kentucky
The Nuclear Company announced Prosperity One, a proposed campus of up to six Westinghouse AP1000 reactors (6.6 GW) in Lewis County, Kentucky, larger than any current U.S. plant. The first phase would include two AP1000s, with construction targeted to begin in 2028 after site characterisation, environmental work and licensing preparation.
What it means for filtration: Large light-water projects run years of construction, fuel handling and radwaste work that need temporary containment, portable HEPA and iodine adsorber carts, and carbon testing. Early-stage projects are when filtration suppliers get written into specifications.
3. Navy picks Radiant's Kaleidos microreactor for Naval Weapons Station Crane
The U.S. Navy selected Radiant Industries to supply a 1 MWe Kaleidos microreactor for Naval Weapons Station Crane in Indiana, the first microreactor planned for a shore-based Navy installation, under the Army-led Janus Program. The Department of War targets installation no later than September 2028. Kaleidos is still in testing at Idaho National Laboratory's DOME facility.
What it means for filtration: Military microreactors add a new class of small, remote sites that need compact, transportable air filtration for maintenance, fuel handling and incident response, often with no permanent HVAC to tie into.
4. Vermont Yankee decommissioning about 99% complete; SONGS starts new tasks
NorthStar Group Services expects physical decommissioning of Vermont Yankee to finish in 2027, with regulatory work and site restoration targeted for 2030. About 28,000 cubic yards of concrete have been shipped to a Texas disposal site, and about $8.5 million remains of the original $602 million trust fund. In California, Southern California Edison reported starting several new decommissioning tasks at San Onofre in the second quarter of 2026.
What it means for filtration: Concrete removal, cutting and demolition are the highest-airflow phases of decommissioning: 8 ACH for power cutting and 10–12 ACH for blasting are common planning values. Our free sizing calculator turns those rates into units, carbon and motor power.
DOE announced that Oklo's Groves Isotope Test Reactor in Lockhart, Texas reached criticality, the fifth DOE-authorized advanced reactor to do so this summer after Antares, Valar Atomics, Deployable Energy and Aalo Atomics. Oklo says the reactor will inform a commercial variant that produces isotopes for medicine, industry, research, space and national security.
What it means for filtration: Isotope-production reactors bring hot cells and target processing, the classic applications for radioiodine and noble-gas off-gas filtration with impregnated activated carbon. Combined with the October 22 NRC rule, these demonstration reactors may move to commercial service faster.
6. NRC accepts University of Illinois microreactor construction application
The NRC accepted the University of Illinois Urbana-Champaign's application to build a Kronos micro modular reactor, designed by Nano Nuclear Energy, on campus, starting its detailed safety and environmental review. The design uses helium cooling and molten-salt-based heat transfer.
What it means for filtration: Campus reactors sit next to classrooms and labs. Universities need filtration for reactor support areas and for the radiochemistry labs that work with iodine isotopes.
7. Microreactor framework (Part 57) proposed; Part 53 in force
The NRC proposed Part 57, a licensing framework for microreactors and similar designs, following Part 53, the risk-informed framework that took effect on April 29, 2026 as the first new reactor licensing framework since 1989. Both stem from the ADVANCE Act and 2025 executive orders.
What it means for filtration: Risk-informed rules put more weight on the safety case for each system, including how ventilation and filtration perform when they are needed. Filter test data, change-out criteria and surveillance plans become part of that case.
Size it in two minutes: airflow from room size and air changes, number of units, carbon bed volume and drums, duct diameter, fan pressure and motor kW, plus a pressure-gauge check for when to change HEPA and carbon.
What was the biggest U.S. nuclear regulatory news in October 2026?
On October 22, 2026 the NRC finalized a rule that lets commercial reactor applicants use data from DOE and Department of War demonstration programs, amending 10 CFR Parts 50 and 53. It is the first major reactor rule finalized under Executive Order 14300.
How many advanced reactors reached criticality under the DOE Reactor Pilot Program in 2026?
Five by early August 2026: Antares, Valar Atomics, Deployable Energy and Aalo Atomics in early summer, and Oklo's Groves isotope test reactor in Texas, announced by DOE on August 6, 2026.
What is Prosperity One?
A proposed campus of up to six Westinghouse AP1000 reactors (6.6 GW) in Lewis County, Kentucky, announced by The Nuclear Company on October 21, 2026, with construction targeted to begin in 2028.
Why do new reactors and decommissioning projects need iodine adsorber filtration?
Fission produces radioiodine and noble gases. HEPA filters capture particles but not gaseous iodine, so hot cells, fuel handling, isotope production and some decommissioning work use impregnated activated carbon adsorbers behind HEPA filters.
How do I size air filtration for a decommissioning or hot-cell job?
Multiply the work-zone volume by the air changes per hour for the task (for example 8 ACH for power cutting, 10–12 for blasting), divide by 60 for CFM and add a 25–50% margin. The free Iodine Air Systems sizing calculator also gives units, carbon volume, duct diameter and motor power.
This update summarizes public reports from the linked sources as of October 26, 2026. Project plans, dates and regulatory outcomes can change; check the primary source before relying on any item. Iodine Air Systems is not affiliated with the companies or agencies named. Our products are designed to EJ/T 20088-2014 and are not currently ASME AG-1 or NQA-1 certified (qualification via partners on request).
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