Vulcan. Great machine. Ahead of its time, in its time.
B1 is robust, but an uncontrolled engine fire in any airplane that doesn't have pod mounted engines is usually catastrophic. Pod mounting the engines seriously degrades performance.
A great site for getting fairly accurate unclassified info on weapons systems is:
www.fas.org/man/index.html
The B-1 page is:
www.fas.org/nuke/guide/usa/bomber/b-1b.htm