An analysis for risk impact of Emergency Diesel Generator on modified Surveillance Test Interval by considering failure due to demand stress

摘要: Abstract The common practice for the estimation of probability a component failure to start on demand is lump together standby failures and due stress induced by itself. In this paper, as well considered separately estimate when Surveillance Test Interval (STI) modified. proposed method based α, ratio that demand. however, should be changed an STI An α′, parameter corresponding α under modification also suggested. With α′ from plant specific database, risk impact analysis Emergency Diesel Generator (EDG) UCN units 3 4 performed. From sensitivity analysis, following conclusions can de derived: if it assumed all occur during time, case in practice, results overestimate impact. And required construct reliability database containing detailed information types recognize whether occurs time or test.