GO:0070478:   nuclear-transcribed mRNA catabolic process, 3"-5" exonucleolytic nonsense-mediated decay
The chemical reactions and pathways resulting in the breakdown of the nuclear-transcribed mRNA transcript body of an mRNA in which an amino-acid codon has changed to a nonsense codon; occurs when the 3" end is not protected by a 3"-poly(A) tail; degradation proceeds in the 3" to 5" direction.