Warning: Do not attempt to hack the clearance rack without proper authorization. You will likely end up with a face full of jam.
Step 1: Gather intel on the clearance rack's internal workings. Study the schematics, observe the flowcharts, and sniff the air for any lingering radiation.
Schematics, Flowcharts, and Radiation Sensors will be your friends.
Step 2: Disable the safety grid. Use your knowledge of the clearance rack's internal workings to bypass the safety features. Be careful not to short circuit the entire facility.
Step 3: Hack the atomizer. Use the disabled safety grid as a makeshift conduit to access the atomizer. Be prepared for an existential crisis as you realize you're essentially playing a game of atomic chicken with the very fabric of reality.
Remember, hacking the clearance rack is not for the faint of heart. You will be tested, you will be tried, and you will likely end up with a severe case of nuclear radiation poisoning. Proceed with caution.