SAFE
Much of the shift is instrument monitoring, log-keeping, and procedure-following that automation already handles or could — reactor control systems are heavily instrumented and self-regulating by design. What protects the job is NRC 10 CFR Part 55: a licensed human operator must be at the controls, personally accountable for reactivity manipulations, and answerable in a way no algorithm can be. Add plant walkdowns, valve lineups, and abnormal-transient judgment where procedures conflict, and displacement risk is low even as headcount per unit slowly falls.
Mixed — a routine tier and a judgment tier. Steady-state load-following, rod position adjustment, and turbine synchronization are already digitally controlled in newer plants, but transient response — diagnosing a conflicting alarm cascade, deciding whether to trip or ride out a feedwater upset, executing EOP transitions when symptoms don't match the flowchart — keeps roughly half the job resistant, which is why this lands at 12 rather than in the safe teens.
Some physical or field component. Most of the shift is in a seated control-room panel or simulator, but operators still perform surveillance walkdowns in the containment and turbine building, manually stroke and tag valves for lineups, hang clearances, and physically operate local controls during loss-of-control-room scenarios — real hands-on work in radiological and high-noise areas, just not the majority of hours, hence 11.
Licensed human required and personally liable. An NRC Reactor Operator or Senior Reactor Operator licence under 10 CFR Part 55 is issued to a named individual after a written exam, operating test, and medical certification, requires biennial renewal and continuing requalification, and can be revoked or criminally enforced against that person for a deliberate misconduct violation — you cannot legally manipulate the controls without it, which is close to the ceiling at 19.
Some relationship component. The relationship that matters is inside the crew and up the chain — the shift supervisor's confidence in your panel calls, peer checks and concurrent verification, and NRC resident inspectors' assessment of your requalification performance — but there is no external client choosing you by name, so 11 rather than the high teens.
Exists to be accountable for ambiguous calls. During an unanalyzed event the licensed operator invokes 10 CFR 50.54(x) authority to depart from licence conditions to protect public health, and routinely makes trip/no-trip and safety-system-actuation calls under minutes of time pressure with core damage as the downside — 17 reflects that the consequences are civilization-scale even though EOPs and AOPs constrain much of the decision space.
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