scram

To leave in a hurry; to go away.

What are you kids doing on my lawn? Scram!

Maybe when he found that Chet's jalopy was gone, he felt he'd better scram, and forgot the coat and hat.

A gun, firearm.

Bad be say she don’t usually do this In the trap with a stick, I do this Get ’round there with a scram I don’t give a damn

My manager says I'm stupid for still rollin' with a scram I hate explainin' myself and I don't think he'll understand

To shut down (a nuclear reactor or, by extension, some other thing) for safety reasons, usually because of an emergency.

The NCR [Nuclear Regulatory Commission] further demands the plant conform to all the safety requirements put into effect during construction. This means constant re-design. There must also be several ways to scram (emergency shut down) the reactor. Some of these are automatic and some are manual.

Startup of reactor recirculating pump resulted in flux spike scraming plant.

Of a nuclear reactor or some other thing: to shut down, usually because of an emergency.

This shut off current to the control rod mechanism, and the reactor scrammed (shut off) automatically.

As soon as the earthquake struck, the reactors "scrammed"—shut down automatically—as they were supposed to.