There are two other definitions of "covered worker" that may apply to RP Techs:
(a) Operating or on-site directing the operation of systems and components that a risk informed
evaluation process has shown to be significant to public health and safety.
(b) Performing maintenance or on-site directing of the maintenance of structures,
systems, and components (SSCs) that a risk-informed evaluation process has shown
to be significant to public health and safety.
This definition may apply to house, supplemental, or contract RP techs depending on specific assignment. It depends on what a company decides 'performing' means I think. But basically, if you are working on or operating a system that can cause a release, you are a covered worker.
This is in addition to the 'e-plan assignment' rule.
Interesting thought, but I'm not sure how that will be interpreted by the different utilities. Uncabuff, you will most definitely be a covered worker as will contract I&C folks, as for the HP's....I'm not sure that a statement such as any system that can cause a release makes you a covered worker. The key words in all of that are "operating" and "working" on.
NEI 06-11 (rev 1) says the following in their definitions:
Maintenance means, the following onsite maintenance activities: Modification, surveillance, post-maintenance testing, and corrective and preventive maintenance of SSCs that a risk-informed evaluation process has shown to be significant to public health and safety
Risk informed evaluation process means an evaluation based on a probabilistic risk analyses approach such as the Maintenance Rule (50.65(a)(4)) or other similar process.
Given that I guess each utility will have to decide what that means.

Whatever the outcome, it's gonna be interesting for the next couple of years.