DYNAMIC AVAILABILITY ASSESSMENT ON TEHRAN RESEARCH REACTOR WATER COOLING SYSTEM

Failures in important safety equipment of nuclear reactors can result in grave deterioration of defense-in-depth barriers of safety. Thus, using an efficient and proactive approach in reliability and safety analysis of nuclear reactors is of utmost importance. Dynamic reliability methods are powerful mathematical frameworks capable of handling interactions among components and process variables explicitly. In principle, they constitute a more realistic modelling of systems for the purpose of reliability analysis. In this paper, ageing effects on availability are evaluated using dynamic analysis by considering impact of maintenance policy and scheduled tasks on Tehran research reactor (TRR) cooling water system, with the help of dynamic fault tree analysis (DFTA), the estimation results for 40 years ageing of the reactor are presented. Keeping maintenance variables constant and in view of decreasing reliability it is noted that availability of the cooling water system decreases with time.

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