• Research
  • Strategic Europe
  • About
  • Experts
Carnegie Europe logoCarnegie lettermark logo
EUUkraine
  • Donate
{
  "authors": [
    "James M. Acton"
  ],
  "type": "legacyinthemedia",
  "centerAffiliationAll": "dc",
  "centers": [
    "Carnegie Endowment for International Peace"
  ],
  "collections": [],
  "englishNewsletterAll": "ctw",
  "nonEnglishNewsletterAll": "",
  "primaryCenter": "Carnegie Endowment for International Peace",
  "programAffiliation": "NPP",
  "programs": [
    "Nuclear Policy"
  ],
  "projects": [],
  "regions": [
    "East Asia",
    "Japan"
  ],
  "topics": [
    "Nuclear Policy",
    "Nuclear Energy"
  ]
}

Source: Getty

In The Media

Japan's Nuclear Situation Takes 'Grim Turn'

While substantial core melting in the Japanese nuclear reactors damaged by the earthquake and following tsunami may create the risk of a large release of radiation into the environment, it is also possible that any amounts of radiation released would be relatively small.

Link Copied
By James M. Acton
Published on Mar 14, 2011

Source: NBC

BRIAN WILLIAMS, Anchor: And we have more now on this nuclear risk. And beyond the immediate area in Japan, a lot of Americans are asking a lot of questions. To that end, with us here in our New York studio tonight, physicist James Acton with the Carnegie Endowment.

Thank you very much for being with us. Let's talk about the risks and consequences, because we are starting to throw around terms like meltdown. What does that mean in terms of danger to humans, both in the area and a great distance away?

JAMES ACTON, Carnegie Endowment for International Peace: Well, good evening, Brian. And when Americans have been looking at the wind maps over the Pacific and they see that the wind blows from Japan to the United States, it's understandable that they get worried. But what they have to remember is two things.

Firstly, as the radiation gets taken and blown out, it gets more and more dilute. And secondly, we are also subject to radiation the whole time. It's in the air, it's in the rocks around us. So whereas this is a very serious situation, the White House has announced today that based on its modeling it doesn't believe there's a threat to people in the United States, and I have no reason to doubt that conclusion.

WILLIAMS: And when you hear they're pouring seawater on a core to cool it down, that's obviously the last resort. They've decided this is just going to become a hot tomb. For how long does that just have to stay inert, untouched?

ACTON: Well, a lot is going to depend on the scale of damage in the core. But you see, as soon as the reactors were shut off, they continued to produce heat. And over the last three days, the engineers running the plant have been in a desperate race to cool those reactors down. And the news for reactors one and three looks like they might, and I stress might, be coming through. But reactor two still appears to be in significant trouble.

WILLIAMS: So a worst-case scenario here, if we lose one, two or, God forbid, all three of these, this remains a deeply local crisis; but thankfully, in a hyper-prepared nation where people have gotten away from the immediate area and now must stay away for a long period of time, I'm guessing.

ACTON: I think that's right. I mean, if there is--if there is substantial core melting, then there is the risk of a large release of radiation into the environment. There's no certainty of a large release of radiation. At Three Mile Island there was extensive core melting and relatively small release of radiation into the environment.

But if there is a large release of radiation into the environment, then the Japanese really have done everything they can. Everybody has been evacuated from around the site, so the immediate injuries due to radiation should be relatively low. The real long-term problem, if there is a large release of radiation, is in long-term illnesses, particularly cancers.

WILLIAMS: All right, James Acton with Carnegie, thank you very much for answering our questions tonight.

ACTON: Thank you.

About the Author

James M. Acton

Jessica T. Mathews Chair, Co-director, Nuclear Policy Program

Acton holds the Jessica T. Mathews Chair and is co-director of the Nuclear Policy Program at the Carnegie Endowment for International Peace.

    Recent Work

  • Other
    Unpacking Trump’s National Security Strategy
      • Cecily Brewer
      • +18

      James M. Acton, Saskia Brechenmacher, Cecily Brewer, …

  • Commentary
    Trump Has an Out on Nuclear Testing. He Should Take It.

      James M. Acton

James M. Acton
Jessica T. Mathews Chair, Co-director, Nuclear Policy Program
James M. Acton
Nuclear PolicyNuclear EnergyEast AsiaJapan

Carnegie does not take institutional positions on public policy issues; the views represented herein are those of the author(s) and do not necessarily reflect the views of Carnegie, its staff, or its trustees.

More Work from Carnegie Europe

  • Commentary
    Strategic Europe
    Taking the Pulse: Is France’s New Nuclear Doctrine Ambitious Enough?

    French President Emmanuel Macron has unveiled his country’s new nuclear doctrine. Are the changes he has made enough to reassure France’s European partners in the current geopolitical context?

      • Rym Momtaz

      Rym Momtaz, ed.

  • Trump United Nations multilateralism institutions 2236462680
    Article
    Resetting Cyber Relations with the United States

    For years, the United States anchored global cyber diplomacy. As Washington rethinks its leadership role, the launch of the UN’s Cyber Global Mechanism may test how allies adjust their engagement.

      • Christopher Painter

      Patryk Pawlak, Chris Painter

  • Commentary
    Strategic Europe
    Europe on Iran: Gone with the Wind

    Europe’s reaction to the war in Iran has been disunited and meek, a far cry from its previously leading role in diplomacy with Tehran. To avoid being condemned to the sidelines while escalation continues, Brussels needs to stand up for international law.

      Pierre Vimont

  • Commentary
    Strategic Europe
    Macron Makes France a Great Middle Power

    France has stopped clinging to notions of being a great power and is embracing the middle power moment. But Emmanuel Macron has his work cut out if he is to secure his country’s global standing before his term in office ends.

      • Rym Momtaz

      Rym Momtaz

  • Commentary
    Can Europe Trust the United States Again?

    In Donald Trump’s second term in office, the transatlantic relationship that helped define the postwar European project and global order appears broken. Is it time for Brussels to chart its own path?

      Nathalie Tocci, Jan Techau

Get more news and analysis from
Carnegie Europe
Carnegie Europe logo, white
Rue du Congrès, 151000 Brussels, Belgium
  • Research
  • Strategic Europe
  • About
  • Experts
  • Projects
  • Events
  • Contact
  • Careers
  • Privacy
  • For Media
  • Gender Equality Plan
Get more news and analysis from
Carnegie Europe
© 2026 Carnegie Endowment for International Peace. All rights reserved.