There's some question regarding the entire premise - apparently no one can really prove they were arming their weapons. Here's some [reading] (http://lewis.armscontrolwonk.com/archive/6909/israel-nuclear-weapons-and-the-1973-yom-kippur-war).

Over the four decades since the war, the nuclear lore about 1973 has turned into an urban legend: nobody knows how exactly it originated and who the real sources were, but it is commonly believed as true or near-true. I call this lore (rumors/claims/conjectures) a “mythology” because they could not be traced to any identifiable source, Israeli or otherwise, who could directly and openly confirm any of those reports.

On the other hand, that doesn't mean they didn't.

As for use-cases it all still does veer into speculation. One popular assumption is the Sampson Option, which essentially is an after-defeat revenge-strike against civilian targets (presumably the cities of the Arab aggressors). The more outlandish claims regarding the strategy involve hitting Moscow and triggering a nuclear war between the US and Soviet Union with a consequent Armageddon, but that's a bit far-fetched given the small delivery ranges and limited number of weapons available to the Israelis at the time.

Another (strangely overlooked but still speculative) option would have been to use the weapons tactically as a last-ditch defense - hitting Arab tank columns, supply centers, etc, to give their military some breathing room and no doubt forcing a ceasefire.

I should follow up and ask where the specific targets would have been if it was a serious consideration?