Just to clarify, clause 18 says that lost wages “arising from the loss of use of property as a result of” preventive measures are compensated. So clause 18 is clearly talking about an emergency situation, because it is an authority acting under a nuclear emergency scheme.
Later on, we see in clause 28 that certain rights and obligations are preserved—that is employment insurance, worker's compensation, and all that. We're trying to say that preventive measures are compensated for anybody working in the area, but considering the fact that it is an emergency measure and the employee will be covered by employment insurance and the like, it's likely that the employee of the nuclear power plant is under clause 28 rather than clause 18.