i managed the destruction of unserviceable US Army ammo in Saudi Arabia at the end of Desert Storm; some 15,000+ tons of it.
Among the ammo we destroyed was 750-1,000 tons of artillery propellant.
i've never had propellant detonate while burning. At KKMC we destroyed 10,000-40,000 pounds of artillery propellent in each burn. We laid the propellant out in long single lines: The primers were burned with small arms. IMO: So long as the stuff is not piled up it won't detonate.
Prior to my arrival at KKMC four US Army members were burned to death when a warrant officer piled propellant in a hole, drove up and threw a thermite grenade into the pile.