Safety case of electric systems in NPP for co-simulation
Publiceringsår
2020
Upphovspersoner
Hänninen, Seppo; Astero, Poria; Lehtonen, Matti; Rosenström, Miro
Abstrakt
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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Publikationstyp
Publikationsform
Separat verk
Målgrupp
Facklig
UKM:s publikationstyp
D4 Publicerad utvecklings- eller forskningsrapport eller -utredning
Publikationskanalens uppgifter
Journal
VTT Technology
Förläggare
VTT Technical Research Centre of Finland
Nummer
370
ISSN
ISBN
Öppen tillgång
Öppen tillgänglighet i förläggarens tjänst
Ja
Licens för förläggarens version
Annan licens
Parallellsparad
Nej
Övriga uppgifter
Vetenskapsområden
El-, automations- och telekommunikationsteknik, elektronik
Nyckelord
[object Object],[object Object],[object Object]
Språk
engelska
Internationell sampublikation
Nej
Sampublikation med ett företag
Nej
DOI
10.32040/2242-122X.2020.T370
Publikationen ingår i undervisnings- och kulturministeriets datainsamling
Ja