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null STUK’s revised safety requirements adopted at the Olkiluoto and Loviisa nuclear power plants

STUK’s revised safety requirements adopted at the Olkiluoto and Loviisa nuclear power plants

5 Oct 2015 17:33
Press release

The Radiation and Nuclear Safety Authority (STUK) has performed an evaluation of how well operational nuclear power plants meet the requirements of the revised regulatory guides on nuclear safety and arrived at decisions on how to further improve safety. The renewal and implementation of detailed national regulatory guides, particularly with regard to nuclear power plants in operation, is a unique measure on the international scale.

The Regulatory Guides on Nuclear Safety (YVL) cover aspects that have an impact on the safety of a nuclear power plant, such as design, operation, the safety of the plant and the environment, nuclear material and waste, structures and equipment. The revised guides were issued in late 2013, after which they have been applied, as such, on the safety planning of future facilities, such as Fennovoima’s nuclear power plant project.

“The distinctive Finnish feature is to prepare a common set of guides for both new and existing nuclear power plants. Regarding plants already in operation, the requirements are applied according to the principle of continuous improvement. In other words, how to improve safety further through practical measures”, says Kirsi Alm-Lytz, Director of STUK’s Nuclear Reactor Regulation Department.

Lessons learned from Fukushima being put to practice

The revised guides do not contain notable technical reform needs with regard to facilities already in operation, given that nearly all new requirements were already implemented during work carried out in the aftermath of the Fukushima accident (2011). According to STUK’s decision, facilities already in operation must nevertheless, during the next few years, expand the scope of their accident analyses, improve measures related to the facilities’ ageing management and develop facility documentation that advances the traceability of modification plans. The decision on how to apply the new guides to the Olkiluoto 3 facility currently under construction will be issued in connection with the statement concerning the facility’s application for an operating licence.

The guides contain more than 8,000 requirements

According to section 7r of the Nuclear Energy Act (990/1987), the Radiation and Nuclear Safety Authority specifies the detailed safety requirements concerning the implementation of safety levels in accordance with the Act. The revised Regulatory Guides on Nuclear Safety consist of 45 guides and more than 8,000 requirements. The revision work took up some 50 man-years at STUK and the implementation approximately four man-years.

Regulatory Guides on Nuclear Safety (YVL)

For further information, please contact

Director Kirsi Alm-Lytz, tel. +358 9 759 88 663
Deputy Director Tomi Routamo, tel. +358 9 759 88 577


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