In May we told you that the review being conducted by the UK’s Nuclear Installations Inspectorate into new reactor designs had issues with EDF and Areva’s European Pressurised Reactor (EPR). Further details are now coming out about how the Inspectorate regards the EPR design as ‘significantly compromised’…

The Health and Safety Executive, which oversees the NII, said that the EPR design could be rejected for use in Britain if its concerns could not be satisfactorily addressed. “It is our regulatory judgment that the control and instrumentation architecture appears overly complex,” the NII letter [to EDF] said. “We have serious concerns about your proposal which allows lower safety class systems to have write access [the ability to override] to higher safety class systems,” it continued.

The letter also highlighted concerns about the absence of safety display systems or manual controls that would allow the reactor to be shut down, either in the station’s control room or at an emergency remote shutdown station.

In other words, the NII don’t trust the designs of EPR’s control and safety systems. Areva is apparently ‘scrambling to produce revised plans’, a situation mirrored in Finland where plans for the control system for the massively late and over-budget EPR being built in Olkiluoto have been described by Finland nuclear watchdog STUK as ‘without a proper design that meets the basic principles of nuclear safety’.

Apparently, in the UK’s case, ‘the design assessment phase could be delayed well past its expected completion in 2011.’ So in Finland, so in the UK. Areva and EDF are nothing if not consistent.