CSNI International Workshop

Defence in Depth of Electrical Systems and Grid Interaction (DIDELSYS) Project

10-11 May 2011
OECD Conference Centre (Room CC12), 2, rue André Pascal, 75116 PARIS

Announcement and Call for Papers

Scope, content and outline of the workshop

The workshop included technical sessions devoted to presentations of the DIDELSYS findings and recommendations complemented with presentations on the topics outlined below. Each technical session addressed operating experience, known problems/vulnerabilities and acceptable solutions. The final session summarized the discussions and developed conclusions and recommendations for possible further actions by the CSNI.

Sessions allocated ample time for discussion on the following issues/problems addressed at the DIDELSYS task group:

Systematic hazard review of possible voltage/frequency transients which could occur from the grid and in NPPs.
Screening criteria to identify the type of single and double fault events which should be considered as credible hazards for NPP onsite electric systems.
Adequacy of design and operational controls to ensure protection against voltage/frequency transients from external/internal electrical systems.
Technical requirements in contracts between the grid and the NPP for assuring proper boundary conditions in hazards assessments.
Operational experience to identify the worst electrical systems faults/scenarios.
Surge withstand capability test of electrical components.
Process to demonstrate acceptable level of safety–included completeness of analysis and testing
Updates of existing electrical standards or need for development of other guidance documents
Grid challenges
Communication interface between nuclear power plant and the electrical power grid
Power supply requirements for protection and control systems
Design features of high reliability onsite power supplies
Digital protective relays
Power supply requirements for NPP operator information systems
Nuclear power plant operators response to electrical events