HSE raise Regulatory Issue against AP1000

The HSE’s Nuclear Directorate, the UK’s nuclear safety and security regulator, has raised a Regulatory Issue (RI) against Westinghouse’s AP1000 nuclear reactor design, and in parallel, released a UK Regulatory position statement.

The concrete filled steel structural modules (CA modules) are outside the scope of applicability of the substantive provisions of WEC’s chosen design standard American Concrete Institute (ACI) standard ACI 349-01.

ND is not yet satisfied that the proposed Steel/Concrete/Steel modular construction methodology, which would be used for some key structures, could protect the reactor’s safety systems from severe weather and other external hazards such as physical impact. ND has therefore requested appropriate evidence to demonstrate that the strength and durability of the structures have been adequately justified.