The struts markup doesn't help us to know if your selector is correct. What's relveant is the actual HTML that is generated and sent to the browser.
But even if the selector is correct, why are you setting the value to false? The value has nothing at all to do with whether the radio element is checked or not. What you want to do is to set the checked attribute on the radio button.
Using jQuery (recommended) that'd be:
where whatever is the selector for the element.