Under the existing legislation, the Nuclear Liability Act, in the case of certain multiple reactor facilities, those multiple reactor facilities are designated as a single installation because they all make use of one vacuum building, so they operate as an entire station. And in the event of an incident, the radionuclides would be contained in the single vacuum building.
It's for this reason, for example, that at the Darlington plant in Clarington the four-station unit is considered to be one installation. Similarly, at Pickering those multi-unit reactors, if they share one vacuum building, are considered to operate as a unit and would be considered as one installation.