Any process in which a virus stops, prevents, or reduces the frequency, rate or extent of host PKR (protein kinase regulated by RNA) activity by promoting the localization of PKR in the nucleus. For example, human cytomegalovirus (HMCV) gene products directly interact with PKR and inhibit its activation by sequestering it in the nucleus, away from both its activator (cytoplasmic dsRNA) and its substrate, (eIF2alpha).