The encapsulation and final disposal facility of spent nuclear fuel

Posiva submitted an application for a construction licence concerning an encapsulation and final disposal facility for spent nuclear fuel to the Ministry of Employment and the Economy at the end of 2012. STUK gave its statement on the application at the beginning of 2015. The permit is granted by the Government at the proposal of the Ministry of Employment and the Economy.

STUK’s inspection of the application for a construction licence concerning the encapsulation and final disposal facility in Olkiluoto focused on verifying that the planning of the facilities and the organisation’s operating method meet the safety requirements provided in government decrees and STUK’s YVL Guides. The most demanding part of the inspection consisted of an assessment of the safety case concerning long-term safety. As a result of the inspection, STUK drew up a safety assessment and provided the Ministry of Employment and the Economy with a statement on the fulfillment of the radiation and nuclear safety requirements.

The final disposal facility consists of an access tunnel that reaches a depth of approximately 450 metres, technical facilities located at a depth of 437 metres and central and final disposal tunnels to be built in phases during the facility’s use. Since 2004, Posiva has been building an underground research facility, called Onkalo, the premises of which are designed to function as part of the final disposal facility.

The final disposal system is composed of a tightly sealed iron-copper canister, a bentonite buffer enclosing the canister, a tunnel backfilling material made of Friedland clay, the seal structures of the tunnels and premises and the enclosing rock.

Share this page