SAFETY SYSTEM AND DETECTING METHOD OF DECREASED CONTROL BAR AND MALFUNCTION OF THERMOCOUPLES IN REACTOR WITH PRESSURE WATER

摘要

Security system of detection of dejected drag link (35) in reactor (3) wiht compressive water uses outlet thermojunctions (45) of the core ordered in few formations (51) and thermal sensors (41, 43) of the hot arm and cold arm to produce signals of drag link shutdown. System processes from thermal signals the signal of deviation of an output (RD) and bending index (CI), which is three-dimensional second derivation of deviation of an output (RD) for each fuel element (11). Signals assure quick and certain detection of dejected drag links (35) and also clearly identify non-functional and defectively functional thermojunctions (45).