Not sure if you’re being sarcastic but boats splitting in half is not uncommon, as far as boat structural failures go it’s a relatively common one.

Stats on such a thing are unavailable but there are many news articles regarding boats splitting in half. I’d hope the safety factor on a fission reactor is several orders of magnitude higher than a seafaring vessel.

marineinsight.com/…/why-do-ships-break-from-the-m…