Probabilistisk Säkerhetsanalys av testintervall för Ringhals 1

Lars Antonsson, Magnus Persson

Abstract: This project evaluates the possibility to perform more
effective periodic testing of stand-by safety systems at the BWR
Ringhals 1 (Boiling Water Reactor). A quantitative probabilistic
safety assessment is performed in order to evaluate the possibility of
reducing the total number of tests while keeping the safety level,
i.e. the core damage frequency, at a constant level. Drawn conclusions
from the quantitative analysis and literature studies lead to
conclusions regarding necessary areas of development of the existing
model of Ringhals 1 and a proposal of methodology regarding changes of
test intervals prescribed by the Technical Specification of Ringhals 1.