I have been a nurse for 2 years now. I spent 1.5 years working at a rural med surg hospital. 3 months ago I transfered to the city hospital in the critical care PCU. The thought is to transition from PCU to CCU. I have many concerns about the unit, and have addressed them to my supervisor and nothing has changed or been said. I am very unhappy with where I am at, feel unsafe, and feel my patients are unsafe. To transfer within the system I am in, I need to get a written release from my supervisor, so I am allowed to apply for other jobs. What is a good way to bring this up to him? And what if he says NO? Could use some good words of advice on how to go about this.