Galactic Sapper wrote:And why shouldn't the scuttling system be based primarily if not solely on the reactors? They are by far the most energetic system on board and the most destructive when they blow. To get anywhere near the same destructive power from the ship's warheads you'd have to gang fire dozens of them at precisely the same instant, since they're all jammed in the magazines as densely as possible, meaning only a couple meters between warheads. The speed of light from the high energy photons released from a nuclear bomb indicates you'd have to time each explosion within a few nanoseconds of each other to prevent non-detonation fratricide between the warheads. Possible with the tech in universe, but tricky to pull off and unnecessary when you have something much better on hand.
Only if you can control the precise form in which the containment is dropped. Otherwise, it's a chaotic event. If the containment drops asymmetrically, then the majority of the hot plasma will be directed in one direction and not the other. You'd get a half-destroyed ship.
Most likely the scuttling system uses the reactors as the main charge or as the secondary charge set off by a system designed to cause containment to fail. To mix universes for a second, the self destruct systems in Star Trek ships were designed to create antimatter containment failures first and only afterward trigger other systems as a backup. The self destruct wasn't containment failing on its own but a specific charge designed to induce containment failure. We may be looking at something similar here.
The big difference between an anti-matter annihilation event and a fusion bottle letting go is that anti-matter doesn't stop being anti-matter after a while in vacuum, but hot plasma cools down. Anti-matter reactions are self-sustaining while fusion are self-extinguishing. Regardless of how you drop the anti-matter containment, the anti-matter will eventually meet matter and annihilate. The majority of the ship isn't blown up by annihilation, but by the high-energy photons that the first annihilations create. Whereas in fusion, with the temperature of the plasma dropping, fusion stops and all you have left is high-energy hydrogen, helium, lithium, etc. that make a lot of damage as it expands.
In a controlled scuttling event, it's possible the reactors are fed an overwhelming amount of plasma to turn the reaction up, just short of melt-down, so there's enough plasma mass and it's hot enough to vaporise the rest of the ship when containment does go down.
BTW, given that the Honorverse is based on gravitational technology, it's possible that their fusion is enabled by gravitation, not temperature. That might make for much safer reactors. But then we might not have the big booms of containment failure.