Analysis On Early Phase Of Severe Accident In Nuclear Power Plant

ANALYSIS ON EARLY PHASE OF SEVERE ACCIDENT IN NUCLEAR POWER PLANT

Sugiyanto
PTRKN - BATAN
ABSTRACT
ANALYSIS ON EARLY PHASE OF SEVERE ACCIDENT IN NUCLEAR POWER PLANT. Analysis on early phase (during100 minutes after accident initiated) of severe accident in the nuclear power plant has been conducted. The objective of this analysis is to understand the progress of core condition from core heat-up, core uncovery, until core melting. This phenomena is interesting to understand because as based for mitigation action by operator. Two scenarios were assumed for analysis, the first scenario, accident is initiated by loss of coolant accident (LOCA) and the second scenario, accident initiated by loss of electric power then each sequence was followed by emergency core cooling system (ECCS) failure. The analysis was conducted using THALES-2 computer code. This analysis showed that, in the first scenario core uncovery occurred at about 14 minutes after accident and core melt started at about 42 minutes. In the second scenario, core uncovery occurred at about 27 minutes after accident and core melt started at about 52 minutes. From this analysis can be concluded that severe accident with initiated LOCA core uncovery will be occur faster.

Keywords: Severe Accident, Nuclear Power Plant, THALES-2
Proceeding Seminar Nasional Ke-15 "TEKNOLOGI DAN KESELAMATAN PLTN SERTA FASILITAS NUKLIR", Surakarta, 17 Oktober 2009