Experimental Study On The Natural Circulation Of A Passive Residual Heat Removal System For An Integral Reactor Following A Safety Related Event

摘要

Natural circulation characteristics of an integral type reactor during the operation of a passive residual heat removal system (PRHRS) following a safety related event has been experimentally investigated by using the VISTA facility. A PRHRS actuation trip signal is generated by a high power trip signal following a steam flow increasing event. The experimental results show that the single-phase coolant flows steadily in the primary loop by a natural convection process and that it effectively removes the decay heat from the core through a steam generator during the PRHRS operation. The heat transfers through the PRHRS heat exchanger and the emergency cooldown tank (EOT) are sufficient enough to enable a two-phase natural circulation of the coolant in the PRHRS loop.