I just wanted to add another response here, after thinking about it for a few days. I've read a papers where killed HIV vaccines etc seem promising. So, I think this is a viable strategy, but there are a few issues. As I wrote in my other comment, you are probably mainly stimulating an antibody response, but not a cellular response.
The issue with using UV, it probably a higher chance of viral re-activation. You would probably use gamma irradiation, maybe with heat and chemical treatment also. The issue with inaction is that you potentially alter the ...
So you can generate a killed virus vaccine with heat or chemicals as well.
This method just doesn't generate a very strong immune response compared to live attenuated vaccines. You need an adjuvant. I am guessing having some cells infected by a live virus contributes to a full immune response (induce CD8 T cells etc).
P.S. in the literature, it does seem (at first glance) that killed vaccines require more doses compared to live vaccines.