Naslov
Development of Event Tree Sequences for Postulated Initiating Event and Definition of Necessary Deterministic Analytical Cases

Autori
Vuković, Igor ; Vrbanić, Ivan

Vrsta, podvrsta i kategorija rada
Radovi u zbornicima skupova, cjeloviti rad (in extenso), znanstveni

Izvornik
Transactions of the International Youth Nuclear Congress 2004 / - Toronto : International Youth Nuclear Congress, 2004

Skup
International Youth Nuclear Congress 2004

Mjesto i datum
Toronto, Kanada, 09.05.2004. - 13.05.2004

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
PSA; event tree; initiating event; deterministic

Sažetak
This paper presents one aspect on how two complementary types of safety analyses, deterministic and probabilistic, interface with each other. The role of deterministic analysis is to check the nuclear power plant (NPP) state in comparison to its operational limitations and licensing conditions. The other, probabilistic analysis, based on failure probability of NPP’ s equipment and systems quantifies the environmental risk due to plant operation within a certain time interval. Probabilistic Safety Assessment (PSA) Level 1 of NPP uses Fault Tree (FT) and Event Tree (ET) methodology in order to quantify core damage frequency due to both internal and external initiating events. This paper includes an example of internal initiating event and investigates the whole family of event tree sequences progressing from postulated initiator. In order to provide clear definition of sequences and their constituting events, it is necessary to carry out certain deterministic analyses (e.g. for the purpose of clear specification of safety systems’ success criteria, determination of time window available for operator action, etc.). One sequence is chosen among the sequences originating from the considered initiator and a process of identification of necessary deterministic analytical cases to be run is demonstrated. The paper continues with the discussion on the use of appropriate tool, such as RELAP, to analyze postulated sequence of events under various assumed boundary conditions in order to determine success criteria for the systems involved (e.g. number of trains needed), time windows for necessary operator actions and similar aspects relevant to the sequence of concern. These determinations are then used for the clear specification of top events for the fault trees from which the event tree sequence will be assembled. The aspects and issues associated with these matters are discussed in detail in the paper.

Izvorni jezik
Engleski

Znanstvena područja
Elektrotehnika

POVEZANOST RADA