Part I of this report describes the types of fuse triggers and associated instrumentation used to find a rapid release mechanism for fuses used to insert boron poisoning into reactors. Three bimetal triggers, a fusible-disk trigger, and an explosive trigger were tested to determine which type would be the most effective.nIt was found that the snap-beam bimetal trigger was the fastest acting, followed by the large-helix bimetal trigger and then the fusible-disk trigger. A small helix coupled with a microswitch did not act until after peak power was reached.
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