Safety case of electric systems in NPP for co-simulation
Year of publication
2020
Authors
Hänninen, Seppo; Astero, Poria; Lehtonen, Matti; Rosenström, Miro
Abstract
This report studies the safety assessment of electric systems for nuclear power plants. Term "safety case" is deliberately used here instead of safety analysis report to emphasize the safety demonstration aspect of the safety assessment. The work covers the definition of overall safety case for electric systems by investigating faults and disturbances related to electric systems. <br/><br/>The work bases on the literature review of the internal and external electrical systems of the nuclear power plant. The literature focuses on electrical system reliability, electrical disturbances and simulation of electrical systems. The literature survey does not attempt to analyse incident reports directly. Instead, it reviews various reports that have already analysed and categorised entries from operational experience databases. Based on the literature review and an analysis of these conditions, this report describes the current state of research on these topics. <br/><br/>The proposed safety case includes typical fault based studies of electrical systems, like lightning overvoltages, short circuit, ground and open phase faults. Also other types of events are included in the safety case, which are related to the safe operation of the nuclear power plant like subsynchronous oscillation, loss of AC power, operation of the switch-over automation, connections to the external grid and flexible operation of the nuclear power plant. The aim is not to provide a complete compilation of possible events for the safety case related to electric systems, but to show important illustrative examples. Some of them will be selected later for the analyses by simulation using the COSI simulation platform. <br/><br/>The report covers also the role of electric systems in probabilistic risk assessment (PRA). The main initiating events connected electric systems in PRA are the loss of external power (LOOP) and also in some countries the open phase conditions (open phase condition).
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Publication type
Publication format
Monograph
Audience
Professional
MINEDU's publication type classification code
D4 Published development or research report or study
Publication channel information
Journal
VTT Technology
Publisher
VTT Technical Research Centre of Finland
Issue
370
ISSN
ISBN
Open access
Open access in the publisher’s service
Yes
License of the publisher’s version
Other license
Self-archived
No
Other information
Fields of science
Electronic, automation and communications engineering, electronics
Keywords
[object Object],[object Object],[object Object]
Language
English
International co-publication
No
Co-publication with a company
No
DOI
10.32040/2242-122X.2020.T370
The publication is included in the Ministry of Education and Culture’s Publication data collection
Yes