"Occurence report for RR" can be, for example, about making several calls to covering provider in escalating clinical situation which were either not answered, or response was clearly outside of "common practice" (like not ordering "septic set" for patient with crushing BP, fever and tachycardia/tachypnea, ignoring deteriorating viral signs, not ordering ICU transfer when it was clearly indicated, etc).
I do not understand the second part. Things, including drugs, devices, monitors and everything else, are used "off label" all the time simply because it is not possible to push every single thing through the multiple steps of EBM. If one "never saw using this thing like that" in X+1 years, it doesn't mean doing so is unsafe or illegal. Policies also cannot encompass everything, and they are changed all the time. Unless you are a specialist, making conclusions of some devise being used in a certain way may easily cross scope of practice line.
And, yeah, hospitals are not required to "report complications". With "compliance line" or without it.
I understand that you probably were just thinking along the line of "iamjustdoingmyjob, iamjustsoooomuchconcernedaboutsafety", but at least with the second part you hit where it hurts most. This "guardian angel" nursing behavior is what irritates physicians beyond means because it affects their function, their decision making and their sense of power. They are picked on by insurance companies, sales, contracts, etc., etc., WAY beyond normal human tolerance level, and "report" of some bedside RN voicing her "concerns" just because she never saw something done can be that last straw.
If I were you, I would run out of there ASAP unless you agree to become a walking target. It may not be "just" but it is what it is. Physicians, and especially surgeons, bring $$$$$ in hospital, nurses bring little to nothing. Fact of life, love it or hate it.