Danube Front `85 Special Weapons Questions

[Fog of War]

Playing DF`85  "Bolt from the Blue" Campaign as WP. About T36 I no longer get the options to use Nukes in WMD capable units. 

 So the question: is there a limit on nukes available per side ? 

Found this in the Designer Notes: " 10. Raised WP Nuke Factor in the .pdt from 35 to 40 which is the same as Nato"

Does that mean they have 40 Nukes available total or is that some kind of " factor "  because I`m sure I haven`t shot 40 .
Great scenario BTW !!