The primary responsibility for nuclear safety, and hence assessment of the potential risks to nuclear licensed sites from all hazards, rests with the license holder. Under the licence conditions attached to the nuclear site license, licensees are required to consider the effect of nearby industrial facilities (including hydraulic fracturing for shale oil or gas) and demonstrate that any associated risks to the nuclear facility are included within the nuclear facility risk assessment (safety case). ONR has a range of tools at its disposal to secure compliance with the licence conditions, and ONR may, if appropriate, carry out technical assessment of the licensee's safety submission covering the risks posed by any nearby facility for hydraulic fracturing.
ONR considers in general that the risks to nuclear facilities associated with fracking are low - see Ref 1. Nevertheless ONR would expect the licence holder to engage with the developer to gain an understanding of the proposed works or development and assess the potential impact on the safety of the licensed facility. In the event that the risks were considered to be unacceptable, ONR may object to such development as part of the planning consultation process.
Reference 1 - Fracking and Nuclear Sites - Earthquakes