Committee on the Safety of Nuclear Installations (CSNI) International workshop on

Robustness of Electrical Systems of NPPs in Light of the Fukushima Daiichi Accident

Paris, France, 1-4 April 2014

Abstracts submission

7 October 2013


Participant registration

28 February 2014


Notification of accepted presentations

15 November 2013


Deadline for presentations submission

28 February 2014




The Defence in Depth of Electrical Systems (DIDELSYS) Project (2008–2011) was launched after a switchyard-induced voltage surge event at Forsmark NPP in July 2006 caused the loss of two of four safety-related AC buses along with all connected I&C and support systems. The DIDELSYS Project was focused on providing recommendations to address internal plant and grid upset events and the ability to safely recover. The March 2011 Tsunami-induced Station AC Blackout accident at Fukushima Daiichi identified loss of AC power concerns that were associated with severe external events, that were beyond the scope of the DIDELSYS Project. The Committee for the Safety of Nuclear Installations (CSNI) chartered a Senior Task Group on Robustness of Electrical Systems of NPPs in Light of the Fukushima Dai-Ichi Accident to evaluate the safety implications of severe external events on safety related electrical systems. The Senior Task Group on Robustness of Electrical Systems of NPPs (ROBELSYS) is responsible for the committee's programme of work in the area of improving the robustness of safety-related electrical systems in nuclear power plants.

The main purpose of ROBELSYS Project and its products are to improve the understanding of nuclear power plant electrical system robustness and defence in depth by comparing design practices and plant emergency and operating procedures in member countries; improve the safety review process of nuclear power plant electrical systems by learning from best practices in member countries; and promote cooperation among member countries to improve safety.


The objective of this international workshop is to provide a forum to exchange information on simulation and design of safety related electrical systems in nuclear power plants around the world. Key focus areas include: simulation of the impacts of external events on NPP electrical systems and lessons learned from the Fukushima Daiichi accident; evaluations of the coping capability of existing NPP electrical systems and components for external events; identification and simulation of limiting features such as batteries, switchgear and controllers; design features to facilitate electrical system recovery from various types of Station AC Blackout scenarios.


The workshop will include technical sessions devoted to technical presentations by participants on the topics outlined in the Preliminary Workshop Programme above and a final session. The final session will summarize the discussions and develop conclusions and recommendations for possible further actions by the CSNI. All the participants are expected to take part in the discussion and in the formulation of conclusions in the final session. Papers and case studies addressing the issues and topics outlined are welcomed. Several sessions with ample time for discussion will be defined according to these topics.

Last reviewed: 12 March 2014