[iguy]

This really wasn't a plausible failure mode. They had many (9?) detonators which had to be very precisely simultaneous, and had done a lot of tests of those alone (this was cheap & easy). As long as just one of them worked, you would burn all the explosives (just not in the right order) and destroy the device.

[catalogia]

I'm sure they had some redundancy in the systems required to fire those detonators too, but how much?

[iguy]

Not sure how you would quantify this, but enough? Inventing detonators that worked fast enough (i.e. small enough error in firing time) was one of the challenges. They did a lot of tests of those explosive lenses. (32, not 9, of course.)

The electronics to fire them would have comparatively easy to test well, and I'm sure they over-designed it all. I doubt that duplicating it would have made anything better.