The Swedish Radiation Safety Authority approves first dismantling project in reactor O2

The Swedish Radiation Safety Authority, SSM, has issued its approval of OKG Aktiebolag's (OKG) revised safety analysis report (SAR) on segmentation of the reactor internals and fuel boxes at the reactor Oskarshamn 2 (O2) of the Oskarshamn nuclear power plant. The decision means that OKG can begin dismantling of O2's internal components.

O2 has been permanently shut down since 22 December 2016. In September 2017, the reactor entered the post-operation phase, and in December, OKG began to apply the safety analysis report for the shut down reactor without irradiated nuclear fuel, though with unirradiated nuclear fuel in dry storage. In compliance with the Swedish Radiation Safety Authority’s regulations concerning safety in nuclear facilities, SSMFS 2008:1, OKG provided a complementary safety analysis report on the segmentation of O2’s internals and fuel boxes.

“In SSM’s initial review of the complementary safety analysis report, we identified an issue relating to OKG’s selection of the limiting component for the radiological impact assessment. For this reason, we requested supplemental information from OKG,” says Martin Amft, an inspector at the Swedish Radiation Safety Authority.

On 1 February 2018, OKG submitted an updated complementary safety analysis report and radiological impact assessment. On 2 March 2018, OKG sent in the report on the decommissioning work package.

“In the form of its complementary updated safety analysis report, OKG has supplemented its SAR on O2’s post-operation phase to a sufficient extent, as well as systematically identified potential events in connection with segmentation of internal components. Our overall conclusion is that OKG meets the requirements for a safety analysis report in connection with a dismantling project. Consequently, OKG is allowed to begin dismantling of internal components of O2,” says Mr Amft.

For more information, please contact: Martin Amft, Inspector, Tel. +46 8 799 40 23, Ove Nilsson, Head of Section, Tel. +46 8 799 40 83, or the Swedish Radiation Safety Authority’s duty press officer, on Tel. + 46 8 799 40 20.

Facts in brief about decommissioning

A licensee of a nuclear power plant or nuclear facility is responsible for ensuring safe decommissioning and fulfilment of all statutory obligations. Roles of the Swedish Radiation Safety Authority include checking and monitoring of planning for decommissioning, supervising its implementation, and checking to ensure regulatory compliance.

Decommissioning of a nuclear facility must be carried out using methods that are well prepared and thorough. The decommissioning process is ongoing as of the final shutdown of the reactor up until the final disposal or clearance of all material from the facility. Thereafter, the facility site and any remaining buildings can be used for new purposes.

The Swedish Radiation Safety Authority exercises regulatory supervision throughout this process.