Russian Icebreaker Project Numbers?

[Apophenia]

Most Russian icebreaker classes have Project numbers applied -- eg: Project 22220 for the LK-60 'Universal Atomic Icebreaker' class.

Does anyone know the Project numbers for the Arctech series? I'm especially curious about the NB-508 Oblique Icebreaker.

 

[Tzoli]

Sorry I only know about these Icebreakers:
Project 92 (1953): Lenin class nuclear-powered icebreaker
Project 97 (1959): Dobrynya Nikitich class icebreaker (note that Project 97 also allocated for the 1941 Srednyaya class Series XVI submarine)
Project 97AP (1967): Sadko class icebreaker
Project 97B (1969): Vladimir Kavrayskiy class icebreaker
Project 97K (1965): Ilya Muromets class icebreaker