On NHPR today, at 9 a.m. EST, Howard Shaffer will debate Ray Shadis of New England Coalition (NEC). That's a few minutes from now.
Here's a link to the NHPR announcement, and you can listen on the web by clicking on the appropriate link in the lower left hand corner.
NEC began fighting Vermont Yankee before it opened, and recently asked the Vermont Supreme Court to shut down the plant.
Update: you can now listen to the broadcast and comment on the program at the NHPR site.