If you click on the "Linage" Tab on the rose page for 'Bernadette Chirac®', then click on the "Descendant Reports", you will find that there is no recorded decedant using this rose in breeding.
Since 'r. rugosa' is a species rose, and species roses are diploid and the pollen parents are tetraploids, it does not necessarily follow that 'Bernadette Chirac®' would be a tetraploid and, therefore, fertile. It may be a triploid.
No, I have not done specific research on this rose and I cannot tell you the ploidity of BC.
