stock here: A-Eye assist as html….hope it works as requested. Arnie is in his late 70’s, he is aging out gracefully, but he never sold out by stepping away from truth, he never chased the “likes”, good on him!
What happened to Arnie Gundersen (the radiation/nuclear risk expert)?
In short: nothing “mysterious.” He didn’t vanish—he largely shifted from constant TV-era commentary (especially during Fukushima’s peak media years) to quieter work: education, consulting, and sworn technical filings in regulatory/legal proceedings.
Why you don’t hear him as much anymore
- The news cycle moved on. Fukushima coverage dropped sharply after the initial years, and engineering-heavy analysis doesn’t “trend.”
- He kept working—just not in the attention economy. Fairewinds publishes analysis, talks, and backgrounders rather than chasing daily headlines.
- Age matters. He’s now in his late 70s, so output tends to be more selective and purpose-driven (testimony, curated briefings, longer-form pieces).
His Fukushima focus (what he stayed known for)
Gundersen’s most persistent technical emphasis around Fukushima was not “temple talk” or vague fear—he repeatedly drilled into specific failure modes and consequence pathways, especially:
- Spent fuel pool risk (Unit 4 was the public flashpoint early on): he addressed Unit 4 spent fuel pool condition and risk in a 2012 Japan symposium-style presentation hosted by Fairewinds.
- Ongoing uncertainty / narrative control: he later argued that institutional “framing” and information control shaped how the world interpreted the disaster and its continuing consequences.
Recent substantive work (last ~12 years)
Regulatory / sworn declarations (very “substantive”)
-
NRC docket filings (2023–2025):
Gundersen is cited as providing an “Amended Declaration” dated April 26, 2023 within NRC proceedings (appears in multiple NRC PDFs).
NRC PDF (Dec 5, 2023) – includes reference to his April 26, 2023 amended declaration
NRC PDF (Jun 16, 2025) – petition/testimony compilation referencing the same declaration -
Declaration (Mar 23, 2021):
a published “Declaration of Arnold Gundersen” PDF used in an intervention context (hosted as a downloadable document).
Declaration of Arnold Gundersen (PDF, 2021-03-23) -
California CPUC / Diablo Canyon (2017):
direct testimony PDF widely mirrored online (often referenced as expert testimony rather than “media commentary”).
Direct Testimony (PDF, 2017)
Fairewinds long-form pieces (public-facing but still technical)
-
Japan’s Nuclear Cover-up Continues (2020):
an example of later-phase Fukushima commentary framed around institutional messaging and continuing consequences.
Fairewinds article (2020-03-10) -
Fukushima Daiichi: The Truth and the Future (2012):
includes direct Q&A addressing Unit 4 spent fuel pool concerns.
Fairewinds presentation page (2012) -
Podcasts / audio archive:
the ongoing Fairewinds podcast stream (episodes vary; use as a timeline anchor).
Fairewinds Podcast Archive
Bottom line
Gundersen as “everywhere,” was largely the 2011–2015 media window. Since then, he’s been more present in regulatory filings, structured presentations, and Fairewinds’ long-form output than in mainstream broadcast rotation. For your blog credibility, the NRC PDFs and sworn declarations are the cleanest “substantive work” citations.