:::Easily enough this particular genre has a solid scholarship and definition behind it, unlike most. Yes nuclear holocaust stories are discussed by Clarke, for example Dr. Strangelove - he says of nuclear holocaust stories:  

 ::::"that fearful possibility has generated the greatest volume of disaster in futuristic fiction, as Paul Brians has demonstrated with admirable scholarship in his authoritative analysis of these stories, Nuclear Holocausts: Atomic War in Fiction, 1895-1984 (1987). This invaluable book covers the fiction of nuclear warfare..The introductory survey gives an excellent history of origins and developments; and the main part of the book provides accounts and commentaries on more than 800 titles. The information is kept up to date in Nuclear Texts and Contexts, newsletter of the International Society for the Study of Nuclear Texts and Contexts."  

 :::Hope this information is helpful, sounds like the makings of a new Wikipedia article Nuclear holocaust literature. Also highly recommend Clarke's Voices Prophesying War, full of good info like that.